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Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Arctic Sea ice model sensitivities.  

SciTech Connect

Arctic sea ice is an important component of the global climate system and, due to feedback effects, the Arctic ice cover is changing rapidly. Predictive mathematical models are of paramount importance for accurate estimates of the future ice trajectory. However, the sea ice components of Global Climate Models (GCMs) vary significantly in their prediction of the future state of Arctic sea ice and have generally underestimated the rate of decline in minimum sea ice extent seen over the past thirty years. One of the contributing factors to this variability is the sensitivity of the sea ice state to internal model parameters. A new sea ice model that holds some promise for improving sea ice predictions incorporates an anisotropic elastic-decohesive rheology and dynamics solved using the material-point method (MPM), which combines Lagrangian particles for advection with a background grid for gradient computations. We evaluate the variability of this MPM sea ice code and compare it with the Los Alamos National Laboratory CICE code for a single year simulation of the Arctic basin using consistent ocean and atmospheric forcing. Sensitivities of ice volume, ice area, ice extent, root mean square (RMS) ice speed, central Arctic ice thickness,and central Arctic ice speed with respect to ten different dynamic and thermodynamic parameters are evaluated both individually and in combination using the Design Analysis Kit for Optimization and Terascale Applications (DAKOTA). We find similar responses for the two codes and some interesting seasonal variability in the strength of the parameters on the solution.

Peterson, Kara J.; Bochev, Pavel Blagoveston; Paskaleva, Biliana Stefanova

2010-12-01T23:59:59.000Z

2

Recovery mechanisms of Arctic summer sea ice  

E-Print Network (OSTI)

[1] We examine the recovery of Arctic sea ice from prescribed ice?free summer conditions in simulations of 21st century climate in an atmosphere–ocean general circulation model. We find that ice extent recovers typically within two years. The excess oceanic heat that had built up during the ice?free summer is rapidly returned to the atmosphere during the following autumn and winter, and then leaves the Arctic partly through increased longwave emission at the top of the atmosphere and partly through reduced atmospheric heat advection from lower latitudes. Oceanic heat transport does not contribute significantly to the loss of the excess heat. Our results suggest that anomalous loss of Arctic sea ice during asinglesummerisreversible,astheice–albedo feedback is alleviated by large?scale recovery mechanisms. Hence, hysteretic threshold behavior (or a “tipping point”) is unlikely to occur during the decline of Arctic summer sea?

unknown authors

2011-01-01T23:59:59.000Z

3

Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications  

E-Print Network (OSTI)

or phase space. In this work we con- sider the trajectory of sea ice in the ice thickness phase space. We175 Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications Geophysical Is the Trajectory of Arctic Sea Ice? Harry L. Stern and Ronald W. Lindsay Polar Science Center, Applied Physics

Lindsay, Ron

4

Snow Depth on Arctic Sea Ice  

Science Conference Proceedings (OSTI)

Snow depth and density were measured at Soviet drifting stations on multiyear Arctic sea ice. Measurements were made daily at fixed stakes at the weather station and once- or thrice-monthly at 10-m intervals on a line beginning about 500 m from ...

Stephen G. Warren; Ignatius G. Rigor; Norbert Untersteiner; Vladimir F. Radionov; Nikolay N. Bryazgin; Yevgeniy I. Aleksandrov; Roger Colony

1999-06-01T23:59:59.000Z

5

Arctic Sea Ice Albedo from AVHRR  

Science Conference Proceedings (OSTI)

The seasonal cycle of surface albedo of sea ice in the Arctic is estimated from measurements made with the Advanced Very High Resolution Radiometer (AVHRR) on the polar-orbiting satellites NOAA-10 and NOAA-11. The albedos of 145 200-km-square ...

R. W. Lindsay; D. A. Rothrock

1994-11-01T23:59:59.000Z

6

Relationships between Arctic Sea Ice and Clouds during Autumn  

Science Conference Proceedings (OSTI)

The connection between sea ice variability and cloud cover over the Arctic seas during autumn is investigated by analyzing the 40-yr ECMWF Re-Analysis (ERA-40) products and the Television and Infrared Observation Satellite (TIROS) Operational ...

Axel J. Schweiger; Ron W. Lindsay; Steve Vavrus; Jennifer A. Francis

2008-09-01T23:59:59.000Z

7

Nonlinear threshold behavior during the loss of Arctic sea ice  

E-Print Network (OSTI)

In light of the rapid recent retreat of Arctic sea ice, a number of studies have discussed the possibility of a critical threshold (or "tipping point") beyond which the ice-albedo feedback causes the ice cover to melt away in an irreversible process. The focus has typically been centered on the annual minimum (September) ice cover, which is often seen as particularly susceptible to destabilization by the ice-albedo feedback. Here we examine the central physical processes associated with the transition from ice-covered to ice-free Arctic Ocean conditions. We show that while the ice-albedo feedback promotes the existence of multiple ice cover states, the stabilizing thermodynamic effects of sea ice mitigate this when the Arctic Ocean is ice-covered during a sufficiently large fraction of the year. These results suggest that critical threshold behavior is unlikely during the approach from current perennial sea ice conditions to seasonally ice-free conditions. In a further warmed climate, however, we find that a ...

Eisenman, I; 10.1073/pnas.0806887106

2008-01-01T23:59:59.000Z

8

Arctic Sea Ice Retreat in 2007 Follows Thinning Trend  

E-Print Network (OSTI)

The minimum of Arctic sea ice extent in the summer of 2007 was unprecedented in the historical record. A coupled ice–ocean model is used to determine the state of the ice and ocean over the past 29 yr to investigate the causes of this ice extent minimum within a historical perspective. It is found that even though the 2007 ice extent was strongly anomalous, the loss in total ice mass was not. Rather, the 2007 ice mass loss is largely consistent with a steady decrease in ice thickness that began in 1987. Since then, the simulated mean September ice thickness within the Arctic Ocean has declined from 3.7 to 2.6 m at a rate of ?0.57 m decade ?1. Both the area coverage of thin ice at the beginning of the melt season and the total volume of ice lost in the summer have been steadily increasing. The combined impact of these two trends caused a large reduction in the September mean ice concentration in the Arctic Ocean. This created conditions during the summer of 2007 that allowed persistent winds to push the remaining ice from the Pacific side to the Atlantic side of the basin and more than usual into the Greenland Sea. This exposed large areas of open water, resulting in the record ice extent anomaly. 1.

R. W. Lindsay; J. Zhang; A. Schweiger; M. Steele; H. Stern

2008-01-01T23:59:59.000Z

9

A recent bifurcation in Arctic sea-ice cover  

E-Print Network (OSTI)

There is ongoing debate over whether Arctic sea-ice has already passed a 'tipping point', or whether it will do so in future, with several recent studies arguing that the loss of summer sea ice does not involve a bifurcation because it is highly reversible in models. Recently developed methods can detect and sometimes forewarn of bifurcations in time-series data, hence we applied them to satellite data for Arctic sea-ice cover. Here we show that a new low ice cover state has appeared from 2007 onwards, which is distinct from the normal state of seasonal sea ice variation, suggesting a bifurcation has occurred from one attractor to two. There was no robust early warning signal of critical slowing down prior to this bifurcation, consistent with it representing the appearance of a new ice cover state rather than the loss of stability of the existing state. The new low ice cover state has been sampled predominantly in summer-autumn and seasonal forcing combined with internal climate variability are likely respons...

Livina, Valerie N

2012-01-01T23:59:59.000Z

10

Development, sensitivity analysis, and uncertainty quantification of high-fidelity arctic sea ice models.  

SciTech Connect

Arctic sea ice is an important component of the global climate system and due to feedback effects the Arctic ice cover is changing rapidly. Predictive mathematical models are of paramount importance for accurate estimates of the future ice trajectory. However, the sea ice components of Global Climate Models (GCMs) vary significantly in their prediction of the future state of Arctic sea ice and have generally underestimated the rate of decline in minimum sea ice extent seen over the past thirty years. One of the contributing factors to this variability is the sensitivity of the sea ice to model physical parameters. A new sea ice model that has the potential to improve sea ice predictions incorporates an anisotropic elastic-decohesive rheology and dynamics solved using the material-point method (MPM), which combines Lagrangian particles for advection with a background grid for gradient computations. We evaluate the variability of the Los Alamos National Laboratory CICE code and the MPM sea ice code for a single year simulation of the Arctic basin using consistent ocean and atmospheric forcing. Sensitivities of ice volume, ice area, ice extent, root mean square (RMS) ice speed, central Arctic ice thickness, and central Arctic ice speed with respect to ten different dynamic and thermodynamic parameters are evaluated both individually and in combination using the Design Analysis Kit for Optimization and Terascale Applications (DAKOTA). We find similar responses for the two codes and some interesting seasonal variability in the strength of the parameters on the solution.

Peterson, Kara J.; Bochev, Pavel Blagoveston; Paskaleva, Biliana S.

2010-09-01T23:59:59.000Z

11

Arctic Sea Ice and Freshwater Changes Driven by the Atmospheric Leading Mode in a Coupled Sea Ice–Ocean Model  

Science Conference Proceedings (OSTI)

Observational and modeling studies have indicated recent large changes of sea ice and hydrographic properties in the Arctic Ocean. However, the observational database is sufficiently sparse that the mechanisms responsible for the recent changes ...

Xiangdong Zhang; Moto Ikeda; John E. Walsh

2003-07-01T23:59:59.000Z

12

Sea Ice in the Canadian Arctic Archipelago: Modeling the Past (1950–2004) and the Future (2041–60)  

Science Conference Proceedings (OSTI)

Considering the recent losses observed in Arctic sea ice and the anticipated future warming due to anthropogenic greenhouse gas emissions, sea ice retreat in the Canadian Arctic Archipelago (CAA) is expected and indeed is already being observed. ...

Tessa Sou; Gregory Flato

2009-04-01T23:59:59.000Z

13

Impact of Daily Arctic Sea Ice Variability in CAM3.0 during Fall and Winter  

Science Conference Proceedings (OSTI)

Climate projections suggest that an ice-free summer Arctic Ocean is possible within several decades and with this comes the prospect of increased ship traffic and safety concerns. The daily sea ice concentration tendency in five Coupled Model ...

Dyre O. Dammann; Uma S. Bhatt; Peter L. Langen; Jeremy R. Krieger; Xiangdong Zhang

2013-03-01T23:59:59.000Z

14

Observed atmospheric response to cold season sea ice variability in the Arctic  

Science Conference Proceedings (OSTI)

The relation between weekly Arctic sea ice concentrations (SIC) from December to April and sea level pressure (SLP) during 1979-2007 is investigated using Maximum Covariance Analysis (MCA). In the North Atlantic sector, the interaction between the ...

Claude Frankignoul; Nathalie Sennéchael; Pierre Cauchy

15

Present-Day Arctic Sea Ice Variability in the Coupled ECHAM5/MPI-OM Model  

Science Conference Proceedings (OSTI)

As a contribution to a detailed evaluation of Intergovernmental Panel on Climate Change (IPCC)-type coupled climate models against observations, this study analyzes Arctic sea ice parameters simulated by the Max-Planck-Institute for Meteorology (...

Nikolay V. Koldunov; Detlef Stammer; Jochem Marotzke

2010-05-01T23:59:59.000Z

16

Long-Term Ice Variability in Arctic Marginal Seas  

Science Conference Proceedings (OSTI)

Examination of records of fast ice thickness (1936–2000) and ice extent (1900–2000) in the Kara, Laptev, East Siberian, and Chukchi Seas provide evidence that long-term ice thickness and extent trends are small and generally not statistically ...

Igor V. Polyakov; Genrikh V. Alekseev; Roman V. Bekryaev; Uma S. Bhatt; Roger Colony; Mark A. Johnson; Valerii P. Karklin; David Walsh; Alexander V. Yulin

2003-06-01T23:59:59.000Z

17

Impact of variable atmospheric and oceanic form drag on simulations of Arctic sea ice  

Science Conference Proceedings (OSTI)

Over Arctic sea ice, pressure ridges, floe and melt pond edges all introduce discrete obstructions to the flow of air or water past the ice, and are a source of form drag. In current climate models form drag is only accounted for by tuning the air-...

Michel Tsamados; Daniel L. Feltham; David Schroeder; Daniela Flocco; Sinead L. Farrell; Nathan Kurtz; Seymour W. Laxon; Sheldon Bacon

18

A Numerical Study of Sea Ice and Ocean Circulation in the Arctic  

Science Conference Proceedings (OSTI)

A sea-ice model based bulk-viscous plastic dynamics and 3-layer thermodynamics is coupled to a multilevel primitive equation model of the Arctic Ocean and Greenland Sea. The combined model is forced by inflow through the Faeroe-Shetland Channel ...

Albert J. Semtner Jr.

1987-08-01T23:59:59.000Z

19

Fluctuating Arctic Sea Ice Thickness Changes Estimated by an In Situ Learned and Empirically Forced Neural Network Model  

Science Conference Proceedings (OSTI)

Sea ice thickness (SIT) is a key parameter of scientific interest because understanding the natural spatiotemporal variability of ice thickness is critical for improving global climate models. In this paper, changes in Arctic SIT during 1982–2003 ...

G. I. Belchansky; D. C. Douglas; N. G. Platonov

2008-02-01T23:59:59.000Z

20

Arctic ice islands  

SciTech Connect

The development of offshore oil and gas resources in the Arctic waters of Alaska requires offshore structures which successfully resist the lateral forces due to moving, drifting ice. Ice islands are floating, a tabular icebergs, up to 60 meters thick, of solid ice throughout their thickness. The ice islands are thus regarded as the strongest ice features in the Arctic; fixed offshore structures which can directly withstand the impact of ice islands are possible but in some locations may be so expensive as to make oilfield development uneconomic. The resolution of the ice island problem requires two research steps: (1) calculation of the probability of interaction between an ice island and an offshore structure in a given region; and (2) if the probability if sufficiently large, then the study of possible interactions between ice island and structure, to discover mitigative measures to deal with the moving ice island. The ice island research conducted during the 1983-1988 interval, which is summarized in this report, was concerned with the first step. Monte Carlo simulations of ice island generation and movement suggest that ice island lifetimes range from 0 to 70 years, and that 85% of the lifetimes are less then 35 years. The simulation shows a mean value of 18 ice islands present at any time in the Arctic Ocean, with a 90% probability of less than 30 ice islands. At this time, approximately 34 ice islands are known, from observations, to exist in the Arctic Ocean, not including the 10-meter thick class of ice islands. Return interval plots from the simulation show that coastal zones of the Beaufort and Chukchi Seas, already leased for oil development, have ice island recurrences of 10 to 100 years. This implies that the ice island hazard must be considered thoroughly, and appropriate safety measures adopted, when offshore oil production plans are formulated for the Alaskan Arctic offshore. 132 refs., 161 figs., 17 tabs.

Sackinger, W.M.; Jeffries, M.O.; Lu, M.C.; Li, F.C.

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

A Variational Method for Computation of Sensible Heat Flux over the Arctic Sea Ice  

Science Conference Proceedings (OSTI)

In this study, a variational approach was employed to compute surface sensible heat flux over the Arctic sea ice. Because the variational approach is able to take into account information from the Monin–Obukhov similarity theory (MOST) as well as ...

Zuohao Cao; Jianmin Ma

2009-04-01T23:59:59.000Z

22

Impact of a Reduced Arctic Sea Ice Cover on Ocean and Atmospheric Properties  

Science Conference Proceedings (OSTI)

The Arctic sea ice cover declined over the last few decades and reached a record minimum in 2007, with a slight recovery thereafter. Inspired by this the authors investigate the response of atmospheric and oceanic properties to a 1-yr period of ...

Jan Sedlá?ek; Reto Knutti; Olivia Martius; Urs Beyerle

2012-01-01T23:59:59.000Z

23

Low-Frequency Variability in the Arctic Atmosphere, Sea Ice, and Upper-Ocean Climate System  

Science Conference Proceedings (OSTI)

The low-frequency natural variability of the arctic climate system is modeled using a single-column, energy balance model of the atmosphere. sea ice, and upper-ocean system. Variability in the system is induced by forcing with realistic, random ...

C. M. Bitz; D. S. Battisti; R. E. Moritz; J. A. Beesley

1996-02-01T23:59:59.000Z

24

Late-Twentieth-Century Simulation of Arctic Sea Ice and Ocean Properties in the CCSM4  

Science Conference Proceedings (OSTI)

To establish how well the new Community Climate System Model, version 4 (CCSM4) simulates the properties of the Arctic sea ice and ocean, results from six CCSM4 twentieth-century ensemble simulations are compared here with the available data. It ...

Alexandra Jahn; Kara Sterling; Marika M. Holland; Jennifer E. Kay; James A. Maslanik; Cecilia M. Bitz; David A. Bailey; Julienne Stroeve; Elizabeth C. Hunke; William H. Lipscomb; Daniel A. Pollak

2012-03-01T23:59:59.000Z

25

Sea Ice Cover and Related Atmospheric Conditions in Arctic Canada During the Summer of 1978  

Science Conference Proceedings (OSTI)

Maps are presented of sea ice cover and open water in the Canadian Arctic for the final day of each month, June–September, 1978. The maps are derived from NOAA satellite imagery and show an extent of open water which is considerably smaller than ...

B. Dey

1980-12-01T23:59:59.000Z

26

Effects of Stochastic Ice Strength Perturbation on Arctic Finite Element Sea Ice Modeling  

Science Conference Proceedings (OSTI)

The ice strength parameter P* is a key parameter in dynamic/thermodynamic sea ice models that cannot be measured directly. Stochastically perturbing P* in the Finite Element Sea Ice–Ocean Model (FESOM) of the Alfred Wegener Institute aims at ...

Stephan Juricke; Peter Lemke; Ralph Timmermann; Thomas Rackow

2013-06-01T23:59:59.000Z

27

Precipitation Shifts over Western North America as a Result of Declining Arctic Sea Ice Cover: The Coupled System Response  

Science Conference Proceedings (OSTI)

Changes in Arctic sea ice cover have the potential to impact midlatitude climate. A previous sensitivity study utilizing the National Center for Atmospheric Research’s (NCAR) atmospheric general circulation model [AGCM; Community Climate Model, ...

Jacob O. Sewall

2005-12-01T23:59:59.000Z

28

Optimization of a Sea Ice Model Using Basinwide Observations of Arctic Sea Ice Thickness, Extent, and Velocity  

Science Conference Proceedings (OSTI)

A stand-alone sea ice model is tuned and validated using satellite-derived, basinwide observations of sea ice thickness, extent, and velocity from the years 1993 to 2001. This is the first time that basin-scale measurements of sea ice thickness ...

Paul A. Miller; Seymour W. Laxon; Daniel L. Feltham; Douglas J. Cresswell

2006-04-01T23:59:59.000Z

29

Fluctuations and seasonality in the Arctic sea ice area: A sudden regime shift in 2007?  

E-Print Network (OSTI)

Since the beginning of satellite observations, the Arctic sea ice extent has shown a downward trend. The decline has been weaker in the March maximum than in the September minimum and masked by inter-annual fluctuations. One of the less understood aspects of the sea ice response is the persistence times for fluctuations, which could indicate the dominant physical processes behind the sea ice decline. To determine the fluctuation persistence times, however, it is necessary to first filter out the dominant effect of the seasonal cycle. In the current study, we thus develop a statistical model, which accurately decomposes the ice area changes into: (1) a variable seasonal cycle component with a constant shape and (2) a residual (short term) fluctuation. We find the persistence time of fluctuations to be only about three weeks, independently from season, which is substantially shorter than previously reported. Such short time scale points to the dominance of atmospheric forcing. The shape of the seasonal cycle is surprisingly constant for the whole observational record despite the rapid decline. This is in agreement with the suggestion that the asymmetry of the seasonal cycle is an effect of Arctic land-sea geography, which has not changed with climate change. The analysis suggest a jump in the annual sea ice area amplitude occurring in 2007, from which it has not yet recovered, possibly revealing a permanent amplitude shift. In physical sense, this could imply a shift towards the younger, thinner and more susceptible ice cover commencing after the immense 2007 multi-year ice loss.

Peter D. Ditlevsen; Ivana Cvijanovic

2013-08-22T23:59:59.000Z

30

The Role of Sea Ice Thickness Distribution in the Arctic Sea Ice Potential Predictability: A Diagnostic Approach with a Coupled GCM  

Science Conference Proceedings (OSTI)

The intrinsic seasonal predictability of Arctic sea ice is investigated in a 400-yr-long preindustrial simulation performed with the Centre National de Recherches Météorologiques Coupled Global Climate Model, version 3.3 (CNRM-CM3.3). The skill of ...

Matthieu Chevallier; David Salas-Mélia

2012-04-01T23:59:59.000Z

31

Modeling the High-Frequency Component of Arctic Sea Ice Drift and Deformation  

Science Conference Proceedings (OSTI)

Buoy observations of sea ice drift show that sea ice motion and deformation contain substantial high-frequency variability at subdaily timescales. However, numerical simulations of the sea ice dynamics normally do not include processes on such ...

Petra Heil; William D. Hibler III

2002-11-01T23:59:59.000Z

32

Improved Sea Ice Shortwave Radiation Physics in CCSM4: The Impact of Melt Ponds and Aerosols on Arctic Sea Ice  

Science Conference Proceedings (OSTI)

The Community Climate System Model, version 4 has revisions across all components. For sea ice, the most notable improvements are the incorporation of a new shortwave radiative transfer scheme and the capabilities that this enables. This scheme ...

Marika M. Holland; David A. Bailey; Bruce P. Briegleb; Bonnie Light; Elizabeth Hunke

2012-03-01T23:59:59.000Z

33

Brine-Driven Eddies under Sea Ice Leads and Their Impact on the Arctic Ocean Mixed Layer  

Science Conference Proceedings (OSTI)

Eddy generation induced by a line-shaped salt flux under a sea ice lead and associated salt transport are investigated using a three-dimensional numerical model. The model is designed to represent a typical condition for the wintertime Arctic ...

Yoshimasa Matsumura; Hiroyasu Hasumi

2008-01-01T23:59:59.000Z

34

The Seasonal Atmospheric Response to Projected Arctic Sea Ice Loss in the Late Twenty-First Century  

Science Conference Proceedings (OSTI)

The authors investigate the atmospheric response to projected Arctic sea ice loss at the end of the twenty-first century using an atmospheric general circulation model (GCM) coupled to a land surface model. The response was obtained from two 60-...

Clara Deser; Robert Tomas; Michael Alexander; David Lawrence

2010-01-01T23:59:59.000Z

35

Interannual Variations of Arctic Cloud Types in Relation to Sea Ice  

Science Conference Proceedings (OSTI)

Sea ice extent and thickness may be affected by cloud changes, and sea ice changes may in turn impart changes to cloud cover. Different types of clouds have different effects on sea ice. Visual cloud reports from land and ocean regions of the ...

Ryan Eastman; Stephen G. Warren

2010-08-01T23:59:59.000Z

36

Blowing Snow on Arctic Sea Ice: Results from an Improved Sea Ice–Snow–Blowing Snow Coupled System  

Science Conference Proceedings (OSTI)

A one-dimensional (1D) version of a blowing snow model, called PIEKTUK-D, has been incorporated into a snow–sea ice coupled system. Blowing snow results in sublimation of approximately 12 mm of snow water equivalent (SWE), which is equal to ...

Yi-Ching Chung; Stéphane Bélair; Jocelyn Mailhot

2011-08-01T23:59:59.000Z

37

Response of the Wintertime Northern Hemisphere Atmospheric Circulation to Current and Projected Arctic Sea Ice Decline: A Numerical Study with CAM5  

Science Conference Proceedings (OSTI)

The wintertime Northern Hemisphere (NH) atmospheric circulation response to current (2007–12) and projected (2080–99) Arctic sea ice decline is examined with the latest version of the Community Atmospheric Model (CAM5). The numerical experiments ...

Yannick Peings; Gudrun Magnusdottir

2014-01-01T23:59:59.000Z

38

Surface Energy Fluxes of Arctic Winter Sea Ice in Barrow Strait  

Science Conference Proceedings (OSTI)

The surface energy balance of sea ice was measured during degree one-week periods in November, January, and February of 1980?81 in the Barrow Strait, Northwest Territories, Canada. Turbulent fluxes were derived with the bulk aerodynamic transfer ...

Konrad Steffen; Ted deMaria

1996-11-01T23:59:59.000Z

39

Recent Changes in Arctic Sea Ice: The Interplay between Ice Dynamics and Thermodynamics  

Science Conference Proceedings (OSTI)

It is well established that periods of high North Atlantic oscillation (NAO) index are characterized by a weakening of the surface high pressure and surface anticyclone in the Beaufort Sea and the intensification of the cyclonic circulation in ...

Jinlun Zhang; Drew Rothrock; Michael Steele

2000-09-01T23:59:59.000Z

40

Severe Ice Conditions in the Bohai Sea, China, and Mild Ice Conditions in the Great Lakes during the 2009/10 Winter: Links to El Niño and a Strong Negative Arctic Oscillation  

Science Conference Proceedings (OSTI)

This study investigates the causes of severe ice conditions over the Bohai Sea, China, and mild ice cover over the North American Great Lakes under the same hemispheric climate patterns during the 2009/10 winter with a strong negative Arctic ...

Xuezhi Bai; Jia Wang; Qinzheng Liu; Dongxiao Wang; Yu Liu

2011-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Internal variability in projections of twenty-first century Arctic sea ice loss: Role of the large-scale atmospheric circulation  

Science Conference Proceedings (OSTI)

Internal variability in twenty-first century summer Arctic sea ice loss and its relationship to the large-scale atmospheric circulation is investigated in a 39-member Community Climate System Model version 3 (CCSM3) ensemble for the period 2000–...

Justin J. Wettstein; Clara Deser

42

Interannual variability of arctic landfast ice between 1976 and 2007  

Science Conference Proceedings (OSTI)

Analysis of weekly sea ice charts produced by the U.S. National Ice Center from 1976 to 2007 indicates large interannual variations in the averaged winter landfast ice extent around the Arctic Basin. During the 32-year period of the record, ...

Yanling Yu; Harry Stern; Charles Fowler; Florence Fetterer; James Maslanik

43

Modeling Linear Kinematic Features in Sea Ice  

Science Conference Proceedings (OSTI)

Sea ice deformation is localized in narrow zones of high strain rate that extend hundreds of kilometers, for example, across the Arctic Basin. This paper demonstrates that these failure zones may be modeled with a viscous–plastic sea ice model, ...

Jennifer K. Hutchings; Petra Heil; William D. Hibler III

2005-12-01T23:59:59.000Z

44

Mercury uptake and dynamics in sea ice algae, phytoplankton and grazing copepods from a Beaufort Sea Arctic marine food web.  

E-Print Network (OSTI)

??Mercury (Hg) is one of the primary contaminants of concern in the Arctic marine ecosystem. Methyl Hg (MeHg) is known to biomagnify in food webs.… (more)

Burt, Alexis Emelia

2012-01-01T23:59:59.000Z

45

Source and Pathway of the Western Arctic Upper Halocline in a Data-Constrained Coupled Ocean and Sea Ice Model  

E-Print Network (OSTI)

A coupled ocean and sea ice model is used to investigate dense water (DW) formation in the Chukchi and Bering shelves and the pathways by which this water feeds the upper halocline. Two 1992–2008 data-constrained solutions ...

Nguyen, An T.

46

The Sensitivity of the Arctic Ocean Sea Ice Thickness and Its Dependence on the Surface Albedo Parameterization  

Science Conference Proceedings (OSTI)

In this study, the response of sea ice thickness to changes in the external forcing is investigated and particularly how this response depends on the surface albedo formulation by means of a one-dimensional coupled ocean–ice–atmosphere model. The ...

Göran Björk; Christian Stranne; Karin Borenäs

2013-02-01T23:59:59.000Z

47

Future Projections of Landfast Ice Thickness and Duration in the Canadian Arctic  

Science Conference Proceedings (OSTI)

Projections of future landfast ice thickness and duration were generated for nine sites in the Canadian Arctic and one site on the Labrador coast with a simple downscaling technique that used a one-dimensional sea ice model driven by ...

J. A. Dumas; G. M. Flato; R. D. Brown

2006-10-01T23:59:59.000Z

48

The Boundary Layer Response to Recent Arctic Sea Ice Loss and Implications for High-Latitude Climate Feedbacks  

Science Conference Proceedings (OSTI)

This study documents and evaluates the boundary layer and energy budget response to record low 2007 sea ice extents in the Community Atmosphere Model version 4 (CAM4) using 1-day observationally constrained forecasts and 10-yr runs with a freely ...

J. E. Kay; K. Raeder; A. Gettelman; J. Anderson

2011-01-01T23:59:59.000Z

49

Source and Pathway of the Western Arctic Upper Halocline in a Data-Constrained Coupled Ocean and Sea Ice Model  

Science Conference Proceedings (OSTI)

A coupled ocean and sea ice model is used to investigate dense water (DW) formation in the Chukchi and Bering shelves and the pathways by which this water feeds the upper halocline. Two 1992–2008 data-constrained solutions at 9- and 4-km ...

An T. Nguyen; Ronald Kwok; Dimitris Menemenlis

2012-05-01T23:59:59.000Z

50

Ice-Tethered Profiler Measurements of Dissolved Oxygen under Permanent Ice Cover in the Arctic Ocean  

Science Conference Proceedings (OSTI)

Four ice-tethered profilers (ITPs), deployed between 2006 and 2009, have provided year-round dissolved oxygen (DO) measurements from the surface mixed layer to 760-m depth under the permanent sea ice cover in the Arctic Ocean. These ITPs drifted ...

M.-L. Timmermans; R. Krishfield; S. Laney; J. Toole

2010-11-01T23:59:59.000Z

51

Estimating the Sea Ice Compressive Strength from Satellite-Derived Sea Ice Drift and NCEP Reanalysis Data  

Science Conference Proceedings (OSTI)

Satellite-derived sea ice drift maps and sea level pressure from reanalysis data are used to infer upper and lower bounds on the large-scale compressive strength of Arctic sea ice. To this end, the two datasets are searched for special situations ...

L-B. Tremblay; M. Hakakian

2006-11-01T23:59:59.000Z

52

Can a Convective Cloud Feedback Help to Eliminate Winter Sea Ice at High CO2 Concentrations?  

Science Conference Proceedings (OSTI)

Winter sea ice dramatically cools the Arctic climate during the coldest months of the year and may have remote effects on global climate as well. Accurate forecasting of winter sea ice has significant social and economic benefits. Such ...

Dorian S. Abbot; Chris C. Walker; Eli Tziperman

2009-11-01T23:59:59.000Z

53

The Melting of Ice in the Arctic Ocean: The Influence of Double-Diffusive Transport of Heat from Below  

Science Conference Proceedings (OSTI)

This investigation was originally prompted by two oceanographic observations: an increased rate of melting of sea ice in the Arctic Ocean, and the advance of an anomalously warm tongue of Atlantic water intruding across the Arctic below the ...

J. S. Turner

2010-01-01T23:59:59.000Z

54

Influence of the Exchanges between the Atlantic and the Arctic on Sea Ice Volume Variations during the Period 1955–97  

Science Conference Proceedings (OSTI)

In order to investigate the causes of sea ice volume variations, two simulations have been performed using two different sea ice–ocean models driven by NCEP–NCAR reanalysis data over the period 1955–97. In both models, the largest changes in ice ...

H. Goosse; R. Gerdes; F. Kauker; C. Köberle

2004-03-01T23:59:59.000Z

55

Reducing uncertainty in high-resolution sea ice models.  

Science Conference Proceedings (OSTI)

Arctic sea ice is an important component of the global climate system, reflecting a significant amount of solar radiation, insulating the ocean from the atmosphere and influencing ocean circulation by modifying the salinity of the upper ocean. The thickness and extent of Arctic sea ice have shown a significant decline in recent decades with implications for global climate as well as regional geopolitics. Increasing interest in exploration as well as climate feedback effects make predictive mathematical modeling of sea ice a task of tremendous practical import. Satellite data obtained over the last few decades have provided a wealth of information on sea ice motion and deformation. The data clearly show that ice deformation is focused along narrow linear features and this type of deformation is not well-represented in existing models. To improve sea ice dynamics we have incorporated an anisotropic rheology into the Los Alamos National Laboratory global sea ice model, CICE. Sensitivity analyses were performed using the Design Analysis Kit for Optimization and Terascale Applications (DAKOTA) to determine the impact of material parameters on sea ice response functions. Two material strength parameters that exhibited the most significant impact on responses were further analyzed to evaluate their influence on quantitative comparisons between model output and data. The sensitivity analysis along with ten year model runs indicate that while the anisotropic rheology provides some benefit in velocity predictions, additional improvements are required to make this material model a viable alternative for global sea ice simulations.

Peterson, Kara J.; Bochev, Pavel Blagoveston

2013-07-01T23:59:59.000Z

56

Parameterizing Turbulent Exchange over Sea Ice in Winter  

Science Conference Proceedings (OSTI)

The Surface Heat Budget of the Arctic Ocean (SHEBA) experiment produced 18 000 h of turbulence data from the atmospheric surface layer over sea ice while the ice camp drifted for a year in the Beaufort Gyre. Multiple sites instrumented during ...

Edgar L. Andreas; P. Ola G. Persson; Andrey A. Grachev; Rachel E. Jordan; Thomas W. Horst; Peter S. Guest; Christopher W. Fairall

2010-02-01T23:59:59.000Z

57

Quantifying the Influence of Atlantic Heat on Barents Sea Ice Variability and Retreat  

Science Conference Proceedings (OSTI)

The recent Arctic winter sea ice retreat is most pronounced in the Barents Sea. Using available observations of the Atlantic inflow to the Barents Sea and results from a regional ice–ocean model the authors assess and quantify the role of ...

M. Årthun; T. Eldevik; L. H. Smedsrud; Ø. Skagseth; R. B. Ingvaldsen

2012-07-01T23:59:59.000Z

58

Sea Ice Thickness Measurements from a Community-Based Observing Network  

Science Conference Proceedings (OSTI)

The accelerating retreat of Arctic sea ice in recent years highlights the need for improved monitoring efforts to provide information relevant to decision makers and stakeholders. Satellite data and global circulation models often lack details ...

A. Mahoney; S. Gearheard; T. Oshima; T. Qillaq

2009-03-01T23:59:59.000Z

59

Scaling properties of sea ice deformation from buoy dispersion P. Rampal,1,2  

E-Print Network (OSTI)

in a gas or two people in a crowd, two nearby pieces of sea ice gradually move apart and disperse [MartinScaling properties of sea ice deformation from buoy dispersion analysis P. Rampal,1,2 J. Weiss,1 D. The deformation is derived from the dispersion of pairs of drifting buoys, using the IABP (International Arctic

Lindsay, Ron

60

Dynamic–Thermodynamic Sea Ice Model: Ridging and Its Application to Climate Study and Navigation  

Science Conference Proceedings (OSTI)

A dynamic–thermodynamic sea ice model with the ocean mixed layer forced by atmospheric data is used to investigate spatial and long-term variability of the sea ice cover in the Arctic basin. The model satisfactorily reproduces the averaged main ...

Sergey V. Shoutilin; Alexander P. Makshtas; Motoyoshi Ikeda; Alexey V. Marchenko; Roman V. Bekryaev

2005-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Global Trends of Sea Ice: Small-Scale Roughness and Refractive Index  

Science Conference Proceedings (OSTI)

Sea ice is one of the most important parameters in the global climate system, specifically the exchange of energy and momentum between the ocean and the atmosphere. In previous studies, a steady decline in Arctic sea ice has been observed over ...

Sungwook Hong; Inchul Shin

2010-09-01T23:59:59.000Z

62

Biogeochemistry in Sea Ice: CICE model developments  

SciTech Connect

Polar primary production unfolds in a dynamic sea ice environment, and the interactions of sea ice with ocean support and mediate this production. In spring, for example, fresh melt water contributes to the shoaling of the mixed layer enhancing ice edge blooms. In contrast, sea ice formation in the fall reduces light penetration to the upper ocean slowing primary production in marine waters. Polar biogeochemical modeling studies typically consider these types of ice-ocean interactions. However, sea ice itself is a biogeochemically active medium, contributing a significant and, possibly, essential source of primary production to polar regions in early spring and fall. Here we present numerical simulations using the Los Alamos Sea Ice Model (CICE) with prognostic salinity and sea ice biogeochemistry. This study investigates the relationship between sea ice multiphase physics and sea ice productivity. Of particular emphasis are the processes of gravity drainage, melt water flushing, and snow loading. During sea ice formation, desalination by gravity drainage facilitates nutrient exchange between ocean and ice maintaining ice algal blooms in early spring. Melt water flushing releases ice algae and nutrients to underlying waters limiting ice production. Finally, snow loading, particularly in the Southern Ocean, forces sea ice below the ocean surface driving an upward flow of nutrient rich water into the ice to the benefit of interior and freeboard communities. Incorporating ice microphysics in CICE has given us an important tool for assessing the importance of these processes for polar algal production at global scales.

Jeffery, Nicole [Los Alamos National Laboratory; Hunke, Elizabeth [Los Alamos National Laboratory; Elliott, Scott [Los Alamos National Laboratory; Turner, Adrian [Los Alamos National Laboratory

2012-06-18T23:59:59.000Z

63

Climate, Ocean and Sea Ice Modeling  

NLE Websites -- All DOE Office Websites (Extended Search)

Climate, Ocean and Sea Ice Modeling (COSIM) Summary The COSIM project develops advanced ocean and ice models for evaluating the role of ocean and ice in high-latitude climate...

64

Observation of Ice Crystal Formation in Lower Arctic Atmosphere  

Science Conference Proceedings (OSTI)

Clear sky ice crystals or diamond dust displays are observed in polar regions, both remote and populated; when the temperature falls to ?20°C and where abundant sources of water vapor are present. In remote areas of the Arctic, these ice crystals ...

Takeshi Ohtake; Kolf Jayaweera; Ken-Ichi Sakurai

1982-12-01T23:59:59.000Z

65

Modeling Sea Ice Transport Using Incremental Remapping  

Science Conference Proceedings (OSTI)

Sea ice models contain transport equations for the area, volume, and energy of ice and snow in various thickness categories. These equations typically are solved with first-order-accurate upwind schemes, which are very diffusive; with second-...

William H. Lipscomb; Elizabeth C. Hunke

2004-06-01T23:59:59.000Z

66

Sea ice mapping method for seawinds  

E-Print Network (OSTI)

Abstract—A sea ice mapping algorithm for SeaWinds is developed that incorporates statistical and spatial a priori information in a modified maximum a posteriori (MAP) framework. Spatial a priori data are incorporated in the loss terms of a Bayes risk formulation. Conditional distributions and priors for sea ice and ocean statistics are represented as empirical histograms that are forced to conform to a set of expected histograms via principal component filtering. Tuning parameters for the algorithm allow adjustments in the algorithm’s performance. Results of the algorithm exhibit high correlation with the Remund–Long sea ice mapping algorithm for SeaWinds and the Special Sensor Microwave/Imager National Aeronautics and Space Administration Team 30 % ice edge, and are verified with RADARSAT-1 ScanSAR imagery. The resulting sea ice maps exhibit high edge detail, preserve polynyas and ice bodies disjoint from the primary ice sheet, and thus are suitable for use with wind retrieval and sea ice studies. Principles employed in the algorithm may be of interest in other classification studies. Index Terms—Bayes method, maximum a posteriori (MAP), principal components, QuikSCAT, scatterometer, sea ice extent, SeaWinds. I.

Hyrum S. Anderson; Student Member; David G. Long; Senior Member

2005-01-01T23:59:59.000Z

67

Rheology of Discrete Failure Regimes of Anisotropic Sea Ice  

Science Conference Proceedings (OSTI)

A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations ...

Alexander V. Wilchinsky; Daniel L. Feltham

2012-07-01T23:59:59.000Z

68

Sensitivity of CAM5-Simulated Arctic Clouds and Radiation to Ice Nucleation Parameterization  

Science Conference Proceedings (OSTI)

Sensitivity of Arctic clouds and radiation in the Community Atmospheric Model, version 5, to the ice nucleation process is examined by testing a new physically based ice nucleation scheme that links the variation of ice nuclei (IN) number ...

Shaocheng Xie; Xiaohong Liu; Chuanfeng Zhao; Yuying Zhang

2013-08-01T23:59:59.000Z

69

Cirriform Rotor Cloud Observed on a Canadian Arctic Ice Cap  

Science Conference Proceedings (OSTI)

A thin rotor cloud was observed on the lee side of Penny Ice Cap in the Canadian Arctic on 21 April 1996. The cloud consisted of thin cirriform layers, so that its motion was clearly observed. By means of time-lapse camera photography, the ...

Hisashi Ozawa; Kumiko Goto-Azuma; Koyuru Iwanami; Roy M. Koerner

1998-06-01T23:59:59.000Z

70

A Heat Balance for the Bering Sea Ice Edge  

Science Conference Proceedings (OSTI)

Detailed oceanographic, meteorological and sea ice observations were obtained from the Bering Sea marginal ice zone (MIZ) during the February–March 1983 Marginal Ice Zone Experiment (MIZEX West). These data have been used in estimating a mean ...

Peter J. Hendricks; Robin D. Muench; Gilbert R. Stegen

1985-12-01T23:59:59.000Z

71

The Accuracy of Sea Ice Drafts Measured from U.S. Navy Submarines  

Science Conference Proceedings (OSTI)

Navy submarines in the Arctic Ocean routinely obtain observations from an upward-looking sonar of the draft of the sea ice cover overhead. Draft data are now publicly available from some 40 cruises from 1975 to 2000 covering over 120 000 km of ...

D. A. Rothrock; Mark Wensnahan

2007-11-01T23:59:59.000Z

72

The Transient versus the Equilibrium Response of Sea Ice to Global Warming  

Science Conference Proceedings (OSTI)

To examine the long-term stability of Arctic and Antarctic sea ice, idealized simulations are carried out with the climate model ECHAM5/Max Planck Institute Ocean Model (MPI-OM). Atmospheric CO2 concentration is increased over 2000 years from ...

Chao Li; Dirk Notz; Steffen Tietsche; Jochem Marotzke

2013-08-01T23:59:59.000Z

73

Tundra burning in Alaska: Linkages to climatic change and sea ice retreat  

E-Print Network (OSTI)

Tundra burning in Alaska: Linkages to climatic change and sea ice retreat Feng Sheng Hu,1 Philip E record. Tundra burning is potentially one such component. Here we report paleoecological evidence showing that recent tundra burning is unprecedented in the central Alaskan Arctic within the last 5000 years. Analysis

Hu, Feng Sheng

74

Obtaining Smooth Hydrographic Profiles from a Buoy Deployed in Sea Ice  

Science Conference Proceedings (OSTI)

SALARGOS buoys that measure upper-ocean temperature and salinity in ice-covered seas have been collecting data in the Arctic basin for several years. The buoys consist of a 300-m-long string of six temperature-conductivity sensors at fixed depths,...

Michael Steele; James H. Morison

1992-12-01T23:59:59.000Z

75

Climate, Ocean and Sea Ice Modeling (COSIM)  

NLE Websites -- All DOE Office Websites (Extended Search)

Earth, Space Sciences » Earth, Space Sciences » Climate, Ocean and Sea Ice Modeling (COSIM) Climate, Ocean and Sea Ice Modeling (COSIM) The COSIM project develops advanced ocean and ice models for evaluating the role of ocean and ice in high-latitude climate change and projecting the impacts of high-latitude change on regions throughout the globe. Get Expertise Phil Jones COSIM Email Matthew Hecht COSIM Email Elizabeth Hunke COSIM Email Mat Maltrud COSIM Email Bill Lipscomb COSIM Email Scott Elliott COSIM Email Todd Ringler COSIM Email We are also developing a set of next-generation ocean and ice models with variable resolution horizontal grids to focus resolution on regions of interest or regions where specific processes (like eddies) need to be resolved. Summary The COSIM project develops advanced ocean and ice models for evaluating the

76

Maintenance of the Sea-Ice Edge  

Science Conference Proceedings (OSTI)

A coupled global climate model is used to evaluate processes that determine the equilibrium location of the sea-ice edge and its climatological annual cycle. The extent to which the wintertime ice edge departs from a symmetric ring around either ...

C. M. Bitz; M. M. Holland; E. C. Hunke; R. E. Moritz

2005-08-01T23:59:59.000Z

77

Major Cloud Plumes in the Arctic and Their Relation to Fronts and Ice Movement  

Science Conference Proceedings (OSTI)

A study of the movement of orographic cloud plumes from one island to another in the Svalbard-Novaya Zemlya region of the Barents Sea revealed a close association with similar movements of arctic fronts. Strong northerly winds behind arctic ...

Robert W. Fett

1992-06-01T23:59:59.000Z

78

Forecast Verification of the Polar Ice Prediction System (PIPS) Sea Ice Concentration Fields  

Science Conference Proceedings (OSTI)

The National Ice Center relies upon a coupled ice–ocean model called the Polar Ice Prediction System (PIPS) to provide guidance for its 24–120-h sea ice forecasts. Here forecast skill assessments of the sea ice concentration (C) fields from PIPS ...

Michael L. Van Woert; Cheng-Zhi Zou; Walter N. Meier; Philip D. Hovey; Ruth H. Preller; Pamela G. Posey

2004-06-01T23:59:59.000Z

79

Influence of parameterized ice habit on simulated mixed phase Arctic clouds  

E-Print Network (OSTI)

Influence of parameterized ice habit on simulated mixed phase Arctic clouds Alexander Avramov1 12 February 2010. [1] The phase partitioning of cloud mass between liquid and ice in mixed phase clouds and its dependence on ambient ice nuclei (IN) concentrations and ice habit parameterizations

80

Antarctic Sea Ice Extent Variability and Its Global Connectivity  

Science Conference Proceedings (OSTI)

This study statistically evaluates the relationship between Antarctic sea ice extent and global climate variability. Temporal cross correlations between detrended Antarctic sea ice edge (SIE) anomaly and various climate indices are calculated. ...

Xiaojun Yuan; Douglas G. Martinson

2000-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Coupled Sea Ice–Ocean-State Estimation in the Labrador Sea and Baffin Bay  

Science Conference Proceedings (OSTI)

Sea ice variability in the Labrador Sea is of climatic interest because of its relationship to deep convection, mode-water formation, and the North Atlantic atmospheric circulation. Historically, quantifying the relationship between sea ice and ...

Ian Fenty; Patrick Heimbach

2013-05-01T23:59:59.000Z

82

The Winter Atmospheric Response to Sea Ice Anomalies in the Barents Sea  

Science Conference Proceedings (OSTI)

The atmospheric response to sea ice anomalies over the Barents Sea during winter was determined by boundary forcing the Community Atmosphere Model (CAM) with daily varying high and low sea ice concentration (SIC) anomalies that decreased ...

Jessica Liptak; Courtenay Strong

2014-01-01T23:59:59.000Z

83

A Novel and Low Cost Sea Ice Mass Balance Buoy.  

Science Conference Proceedings (OSTI)

The understanding of sea ice mass balance processes requires continuous monitoring of the seasonal evolution of the ice thickness. While autonomous ice mass balance buoys (IMB buoys) deployed over the past two decades have contributed to our ...

Keith Jackson; Jeremy Wilkinson; Ted Maksym; Justin Beckers; Christian Haas; David Meldrum; David Mackenzie

84

Mathematical model for ice formation in the Arctic during Alain Pham Ngoc Dinh and Phan Thanh Nam  

E-Print Network (OSTI)

Mathematical model for ice formation in the Arctic during summer Alain Pham Ngoc Dinh and Phan The only source of ice formation in the Arctic during summer is a layer of ice be- tween an under-ice melt-bottoms is governed by both of heat fluxes and salt fluxes. This is a two-phase Stefan problem with two free

85

Ice properties of single-layer stratocumulus during the Mixed-Phase Arctic Cloud Experiment  

E-Print Network (OSTI)

Ice properties of single-layer stratocumulus during the Mixed-Phase Arctic Cloud Experiment: 2 opportunity to study poorly understood ice formation processes in mixed-phase stratocumulus. Using, were not significant sources of ice based on parameterizations from existing studies. After surveying

86

Fractionation of Dissolved Solutes and Chromophoric Dissolved Organic Matter During Experimental Sea Ice Formation.  

E-Print Network (OSTI)

In the past decade there has been an overall decrease in Arctic Ocean sea ice cover. Changes to the ice cover have important consequences for organic carbon cycling, especially over the continental shelves. When sea ice is formed, dissolved organic carbon (DOC) and other tracers are fractionated in relation to the initial water. Two separate “freeze-out” experiments were conducted to observe the effects of fractionation during ice formation. In experiment 1, marine and freshwater end members were mixed together in different ratios to create four different salinities. In experiment 2, a brackish water sample was collected. The initial unfrozen water, ice melt, and post-freeze brine water were tested for dissolved organic carbon, total nitrogen (TN), dissolved inorganic carbon (DIC), fluorescence and absorption (optics), water isotopes (?18O and ?D), and lignin phenols. Results showed a clear fractionation effect for all parameters, where the ice samples contained much less of the dissolved species than the enriched brine samples. This information is important to consider when trying using these parameters to determine the fate of carbon and the freshwater budget to the Arctic Ocean.

Smith, Stephanie 1990-

2012-05-01T23:59:59.000Z

87

Development of a Regional Climate Model of the Western Arctic  

Science Conference Proceedings (OSTI)

An Arctic region climate system model has been developed to simulate coupled interactions among the atmosphere, sea ice, ocean, and land surface of the western Arctic. The atmospheric formulation is based upon the NCAR regional climate model ...

Amanda H. Lynch; William L. Chapman; John E. Walsh; Gunter Weller

1995-06-01T23:59:59.000Z

88

Modeling Landfast Sea Ice by Adding Tensile Strength  

Science Conference Proceedings (OSTI)

Landfast ice is sea ice that forms and remains fixed along a coast, where it is either attached to the shore or held between shoals or grounded icebergs. The current generation of sea ice models is not capable of reproducing certain aspects of ...

Christof König Beatty; David M. Holland

2010-01-01T23:59:59.000Z

89

Modeling of Antarctic sea ice in a general circulation model  

SciTech Connect

A dynamic-thermodynamic sea ice model is developed and coupled with the Melbourne University general circulation model to simulate the seasonal cycle of the Antarctic sea ice distributions The model is efficient, rapid to compute, and useful for a range of climate studies. The thermodynamic part of the sea ice model is similar to that developed by Parkinson and Washington, the dynamics contain a simplified ice rheology that resists compression. The thermodynamics is based on energy conservation at the top surface of the ice/snow, the ice/water interface, and the open water area to determine the ice formation, accretion, and ablation. A lead parameterization is introduced with an effective partitioning scheme for freezing between and under the ice floes. The dynamic calculation determines the motion of ice, which is forced with the atmospheric wind, taking account of ice resistance and rafting. The simulated sea ice distribution compares reasonably well with observations. The seasonal cycle of ice extent is well simulated in phase as well as in magnitude. Simulated sea ice thickness and concentration are also in good agreement with observations over most regions and serve to indicate the importance of advection and ocean drift in the determination of the sea ice distribution. 64 refs., 15 figs., 2 tabs.

Wu, Xingren; Budd, W.F. [Antarctic Cooperative Research Centre, Tasmania (Australia)] [Antarctic Cooperative Research Centre, Tasmania (Australia); Simmonds, I. [School of Earth Sciences, Victoria (Australia)] [School of Earth Sciences, Victoria (Australia)

1997-04-01T23:59:59.000Z

90

Influence of Humidified Aerosol on Lidar Depolarization Measurements below Ice-Precipitating Arctic Stratus  

Science Conference Proceedings (OSTI)

Lidar measurements obtained during the Surface Heat Budget of the Arctic Ocean (SHEBA) experiment under a mixed-phase stratus cloud that was lightly precipitating ice show a range of surprisingly low depolarization ratios (4%–23%), despite an ...

Bastiaan van Diedenhoven; Ann M. Fridlind; Andrew S. Ackerman

2011-10-01T23:59:59.000Z

91

Short-lived pollutants in the Arctic: their climate impact and possible mitigation strategies  

E-Print Network (OSTI)

reduced rate of ice formation in mixed- phase Arctic cloudsincreases occur in phase with sea ice melt, potentiallyIce properties of single-layer stratocumulus during the Mixed-Phase

Quinn, P.K.

2008-01-01T23:59:59.000Z

92

Prediction of Vessel Icing for Near-Freezing Sea Temperatures  

Science Conference Proceedings (OSTI)

The operational NOAA categorical vessel icing algorithm is evaluated with regard to advances in understanding of the icing process and forecasting experience. When sea temperatures are <2–3°C above the saltwater freezing point there is the ...

James E. Overland

1990-03-01T23:59:59.000Z

93

SEAS Recognition Ceremony -May 10, 2009 Goggin Ice Arena  

E-Print Network (OSTI)

Page 1 SEAS Recognition Ceremony - May 10, 2009 Goggin Ice Arena Main Arena - Ceremony Location Oak Card Distribution, Student & Faculty Processional Line Up. Students: Upon arriving at Goggin Ice Arena

Dollar, Anna

94

Sound Scattering from Sea Ice: Aspects Relevant to Ice-Draft Profiling by Sonar  

Science Conference Proceedings (OSTI)

Accurate discrimination between thin ice and open water using sonar is an important practical concern for the calibration of ice-draft observations and for the use of ice-profiling sonar in climate-related studies of sea ice. To guide improvement ...

Humfrey Melling

1998-08-01T23:59:59.000Z

95

A New Apparatus for Monitoring Sea Ice Thickness Based on the Magnetostrictive-Delay-Line Principle  

Science Conference Proceedings (OSTI)

High-precision ice thickness observations are required to gain a better understanding of ocean–ice–atmosphere interactions and to validate numerical sea ice models. A new apparatus for monitoring sea ice and snow thickness has been developed, ...

Ruibo Lei; Zhijun Li; Yanfeng Cheng; Xin Wang; Yao Chen

2009-04-01T23:59:59.000Z

96

Dependence of Sea Ice Yield-Curve Shape on Ice Thickness  

Science Conference Proceedings (OSTI)

In this note, the authors discuss the contribution that frictional sliding of ice floes (or floe aggregates) past each other and pressure ridging make to the plastic yield curve of sea ice. Using results from a previous study that explicitly ...

Alexander V. Wilchinsky; Daniel L. Feltham

2004-12-01T23:59:59.000Z

97

Modeled winter sea ice variability and the North Atlantic Oscillation: a multi-century perspective  

E-Print Network (OSTI)

leading mode in a coupled sea ice-ocen model. J Clim 16:009-0550-7 Modeled winter sea ice variability and the Northrelationship between winter sea ice vari- ability and the

Strong, Courtenay; Magnusdottir, Gudrun

2010-01-01T23:59:59.000Z

98

A Markov Model for Seasonal Forecast of Antarctic Sea Ice  

Science Conference Proceedings (OSTI)

A linear Markov model has been developed to simulated and predict the short-term climate change in the Antarctic, with particular emphasis on sea ice variability. Seven atmospheric variables along with sea ice were chosen to define the state of ...

Dake Chen; Xiaojun Yuan

2004-08-01T23:59:59.000Z

99

Enhancement of Sea Ice Drift due to the Dynamical Interaction between Sea Ice and a Coastal Ocean  

Science Conference Proceedings (OSTI)

Wind factor, the ratio of sea ice drift speed to surface wind speed, is a key factor for the dynamics of sea ice and is generally about 2%. In some coastal oceans, however, the wind factor tends to be larger near the coast. This study proposes the ...

Yoshihiro Nakayama; Kay I. Ohshima; Yasushi Fukamachi

2012-01-01T23:59:59.000Z

100

Hydrographic Preconditioning for Seasonal Sea Ice Anomalies in the Labrador Sea  

Science Conference Proceedings (OSTI)

This study investigates the hydrographic processes involved in setting the maximum wintertime sea ice (SI) extent in the Labrador Sea and Baffin Bay. The analysis is based on an ocean and sea ice state estimate covering the summer-to-summer 1996/...

Ian Fenty; Patrick Heimbach

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Investigation of Microphysical Parameterizations of Snow and Ice in Arctic Clouds during M-PACE through ModelObservation Comparisons  

E-Print Network (OSTI)

Investigation of Microphysical Parameterizations of Snow and Ice in Arctic Clouds during M the microphysical properties of Arctic mixed-phase stratocumulus. Intensive measurements taken during the Department of Energy Atmospheric Radiation Measurement Program Mixed-Phase Arctic Cloud Experiment (M

Solomon, Amy

102

Ocean Heat Transport as a Cause for Model Uncertainty in Projected Arctic Warming  

Science Conference Proceedings (OSTI)

The Arctic climate is governed by complex interactions and feedback mechanisms between the atmosphere, ocean, and solar radiation. One of its characteristic features, the Arctic sea ice, is very vulnerable to anthropogenically caused warming. ...

Irina Mahlstein; Reto Knutti

2011-03-01T23:59:59.000Z

103

Do General Circulation Models Underestimate the Natural Variability in the Arctic Climate?  

Science Conference Proceedings (OSTI)

The authors examine the natural variability of the arctic climate system simulated by two very different models: the Geophysical Fluid Dynamics Laboratory (GFDL) global climate model, and an area-averaged model of the arctic atmosphere–sea ice–...

D. S. Battisti; C. M. Bitz; R. E. Moritz

1997-08-01T23:59:59.000Z

104

Multiple sea-ice states and abrupt MOC transitions in a general circulation ocean model  

E-Print Network (OSTI)

Multiple sea-ice states and abrupt MOC transitions in a general circulation ocean model Yosef: 25 September 2012 Ã? Springer-Verlag Berlin Heidelberg 2012 Abstract Sea ice has been suggested, based-called ``sea-ice switch'' mech- anism. An important requirement for this mechanism is that multiple sea-ice

Ashkenazy, Yossi "Yosef"

105

Coupled Sea Ice–Ocean-State Estimation in the Labrador Sea and Baffin Bay  

E-Print Network (OSTI)

Sea ice variability in the Labrador Sea is of climatic interest because of its relationship to deep convection, mode-water formation, and the North Atlantic atmospheric circulation. Historically, quantifying the relationship ...

Fenty, Ian

106

A ``triple sea-ice state'' mechanism for the abrupt warming and synchronous ice sheet collapses during Heinrich events  

E-Print Network (OSTI)

changes. This weak coupling can lead to a ``nonlinear phase locking'' of the different ice sheets whichA ``triple sea-ice state'' mechanism for the abrupt warming and synchronous ice sheet collapses. [1] Abrupt, switch-like, changes in sea ice cover are proposed as a mechanism for the large

Sayag, Roiy

107

Photophysiology and cellular composition of sea ice algae  

SciTech Connect

The productivity of sea ice algae depends on their physiological capabilities and the environmental conditions within various microhabitats. Pack ice is the dominant form of sea ice, but the photosynthetic activity of associated algae has rarely been studied. Biomass and photosynthetic rates of ice algae of the Weddell-Scotia Sea were investigated during autumn and winter, the period when ice cover grows from its minimum to maximum. Biomass-specific photosynthetic rates typically ranged from 0.3 to 3.0 {mu}g C {center dot} {mu}g chl{sup {minus}1} {center dot} h{sup {minus}1} higher than land-fast ice algae but similar to Antarctic phytoplankton. Primary production in the pack ice during winter may be minor compared to annual phytoplankton production, but could represent a vital seasonal contribution to the Antarctic ecosystem. Nutrient supply may limit the productivity of ice algae. In McMurdo Sound, congelation ice algae appeared to be more nutrient deficient than underlying platelet ice algae based on: lower nitrogen:carbon, chlorophyll:carbon, and protein:carbohydrate; and {sup 14}C-photosynthate distribution to proteins and phospholipids was lower, while distribution to polysaccharides and neutral lipids was higher. Depletion of nitrate led to decreased nitrogen:carbon, chlorophyll:carbon, protein:carbohydrate, and {sup 14}C-photosynthate to proteins. Studied were conducted during the spring bloom; therefore, nutrient limitation may only apply to dense ice algal communities. Growth limiting conditions may be alleviated when algae are released into seawater during the seasonal recession of the ice cover. To continue growth, algae must adapt to the variable light field encountered in a mixed water column. Photoadaptation was studied in surface ice communities and in bottom ice communities.

Lizotte, M.P.

1989-01-01T23:59:59.000Z

108

A Reformulated Three-Layer Sea Ice Model  

Science Conference Proceedings (OSTI)

A model is presented that provides an efficient approximation to sea ice thermodynamics for climate studies. Semtner’s three-layer framework is used, but the brine content of the upper ice is represented with a variable heat capacity as is done ...

Michael Winton

2000-04-01T23:59:59.000Z

109

Eddies in the Canada Basin, Arctic Ocean, Observed from Ice-Tethered Profilers  

Science Conference Proceedings (OSTI)

Five ice-tethered profilers (ITPs), deployed between 2004 and 2006, have provided detailed potential temperature ? and salinity S profiles from 21 anticyclonic eddy encounters in the central Canada Basin of the Arctic Ocean. The 12–35-m-thick ...

M-L. Timmermans; J. Toole; A. Proshutinsky; R. Krishfield; A. Plueddemann

2008-01-01T23:59:59.000Z

110

The Role of Sea Ice in 2×CO2 Climate Model Sensitivity. Part I: The Total Influence of Sea Ice Thickness and Extent  

Science Conference Proceedings (OSTI)

As a first step in investigating the effects of sea ice changes on the climate sensitivity to doubled atmospheric CO2, the authors use a standard simple sea ice model while varying the sea ice distributions and thicknesses in the control run. ...

D. Rind; R. Healy; C. Parkinson; D. Martinson

1995-03-01T23:59:59.000Z

111

Physica B 338 (2003) 274283 Critical behavior of transport in sea ice  

E-Print Network (OSTI)

, the sea ice is effectively impermeable, while for higher temperatures the brine phase becomes connectedPhysica B 338 (2003) 274­283 Critical behavior of transport in sea ice K.M. Golden* Department materials such as sea ice, rocks, soils, snow, and glacial ice are composite media with complex, random

Golden, Kenneth M.

112

Sea Ice-Ocean-Oilspill Modeling System (SIOMS) for the Nearshore Beaufort and Chukchi Seas  

E-Print Network (OSTI)

: Parameterization and Improvement (Phase II) Jia Wang Principal Investigator Co-principal Investigators: Kohei) for the Nearshore Beaufort and Chukchi Seas: Parameterization and Improvement (Phase II) Jia Wang PrincipalSea Ice-Ocean-Oilspill Modeling System (SIOMS) for the Nearshore Beaufort and Chukchi Seas

113

Arctic Ocean Warming Contributes to Reduced Polar Ice Cap  

Science Conference Proceedings (OSTI)

Analysis of modern and historical observations demonstrates that the temperature of the intermediate-depth (150–900 m) Atlantic water (AW) of the Arctic Ocean has increased in recent decades. The AW warming has been uneven in time; a local 1°C ...

Igor V. Polyakov; Leonid A. Timokhov; Vladimir A. Alexeev; Sheldon Bacon; Igor A. Dmitrenko; Louis Fortier; Ivan E. Frolov; Jean-Claude Gascard; Edmond Hansen; Vladimir V. Ivanov; Seymour Laxon; Cecilie Mauritzen; Don Perovich; Koji Shimada; Harper L. Simmons; Vladimir T. Sokolov; Michael Steele; John Toole

2010-12-01T23:59:59.000Z

114

Long-Range Statistical Forecasting of Ice Severity in the Beaufort–Chukchi Sea  

Science Conference Proceedings (OSTI)

Interannual variations in Beaufort Sea summer ice conditions influence a wide range of socioeconomic activities, including merchant shipping in the Beaufort Sea and subsistence lifestyles on the Alaskan North Slope. Each year, the National Ice ...

Sheldon Drobot

2003-12-01T23:59:59.000Z

115

A Novel and Low-Cost Sea Ice Mass Balance Buoy  

Science Conference Proceedings (OSTI)

The understanding of sea ice mass balance processes requires continuous monitoring of the seasonal evolution of the ice thickness. While autonomous ice mass balance (IMB) buoys deployed over the past two decades have contributed to scientists' ...

Keith Jackson; Jeremy Wilkinson; Ted Maksym; David Meldrum; Justin Beckers; Christian Haas; David Mackenzie

2013-11-01T23:59:59.000Z

116

Development of a Sea Ice Model for Use in Zonally Averaged Energy Balance Climate Models  

Science Conference Proceedings (OSTI)

A sea ice model for use in zonally averaged energy balance climate models is presented which includes the following processes: surface melting, basal freezing and melting, lateral melting from ice-flee water or growth of new ice in leads, ...

L. D. Danny Harvey

1988-12-01T23:59:59.000Z

117

Sea Ice–Atmosphere Signal of the Southern Oscillation in the Weddell Sea, Antarctica  

Science Conference Proceedings (OSTI)

Composite analysis of weekly ship and shore observations of the Weddell Sea pack ice for extreme events of the Southern Oscillation (SO) occurring in the 1929–62 period reveals strong variations in ice-water concentrations in the early and late ...

Andrew M. Carleton

1988-04-01T23:59:59.000Z

118

The Role of Ice–Ocean Interactions in the Variability of the North Atlantic Thermohaline Circulation  

Science Conference Proceedings (OSTI)

The simulated influence of Arctic sea ice on the variability of the North Atlantic climate is discussed in the context of a global coupled ice–ocean–atmosphere model. This coupled system incorporates a general circulation ocean model, an ...

Marika M. Holland; Cecilia M. Bitz; Michael Eby; Andrew J. Weaver

2001-03-01T23:59:59.000Z

119

Large Decadal Decline of the Arctic Multiyear Ice Cover  

Science Conference Proceedings (OSTI)

The perennial ice area was drastically reduced to 38% of its climatological average in 2007 but recovered slightly in 2008, 2009, and 2010 with the areas being 10%, 24%, and 11% higher than in 2007, respectively. However, trends in extent and area ...

Josefino C. Comiso

2012-02-01T23:59:59.000Z

120

Latitudinal distribution of the recent Arctic warming  

Science Conference Proceedings (OSTI)

Increasing Arctic temperature, disappearance of Arctic sea ice, melting of the Greenland ice sheet, sea level rise, increasing strength of Atlantic hurricanes are these impending climate catastrophes supported by observations? Are the recent data really unprecedented during the observational records? Our analysis of Arctic temperature records shows that the Arctic and temperatures in the 1930s and 1940s were almost as high as they are today. We argue that the current warming of the Arctic region is affected more by the multi-decadal climate variability than by an increasing concentration of carbon dioxide. Unfortunately, none of the existing coupled Atmosphere-Ocean General Circulation Models used in the IPCC 2007 cIimate change assessment is able to reproduce neither the observed 20th century Arctic cIimate variability nor the latitudinal distribution of the warming.

Chylek, Petr [Los Alamos National Laboratory; Lesins, Glen K [DALLHOUSIE UNIV.; Wang, Muyin [UNIV OF WASHINGTON

2010-12-08T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Tracking the Motion of Sea Ice by Correlation Sonar  

Science Conference Proceedings (OSTI)

A prototype correlation sonar has been developed for the measurement of ice motion in polar seas. It operates in the very shallow-water mode as a two-pulse spatial correlation log. The design was guided by numerical signal simulations, which ...

James L. Galloway; Humfrey Melling

1997-06-01T23:59:59.000Z

122

Heat and Moisture Advection over Antarctic Sea Ice  

Science Conference Proceedings (OSTI)

Surface-level meteorological observations and upper-air soundings in the Weddell Sea provide the first in situ look at conditions over the deep Antarctic ice pack in the spring. The surface?level temperature and humidity were relatively high, and ...

Edgar L. Andreas

1985-05-01T23:59:59.000Z

123

A Simple Ice–Ocean Model for the Greenland Sea  

Science Conference Proceedings (OSTI)

A steady, coupled model of the upper ocean circulation and ice cover in a meridional channel is presented and applied to the Greenland Sea. The main ocean gyre is driven by wind stress; however a nonzero boundary condition on meridional velocity ...

Rosemary G. Wood; Lawrence A. Mysak

1989-12-01T23:59:59.000Z

124

Simulating mixed-phase Arctic stratus clouds: Sensitivity to ice initiationmechanisms  

SciTech Connect

The importance of Arctic mixed-phase clouds on radiation and the Arctic climate is well known. However, the development of mixed-phase cloud parameterization for use in large scale models is limited by lack of both related observations and numerical studies using multidimensional models with advanced microphysics that provide the basis for understanding the relative importance of different microphysical processes that take place in mixed-phase clouds. To improve the representation of mixed-phase cloud processes in the GISS GCM we use the GISS single-column model coupled to a bin resolved microphysics (BRM) scheme that was specially designed to simulate mixed-phase clouds and aerosol-cloud interactions. Using this model with the microphysical measurements obtained from the DOE ARM Mixed-Phase Arctic Cloud Experiment (MPACE) campaign in October 2004 at the North Slope of Alaska, we investigate the effect of ice initiation processes and Bergeron-Findeisen process (BFP) on glaciation time and longevity of single-layer stratiform mixed-phase clouds. We focus on observations taken during October 9th-10th, which indicated the presence of a single-layer mixed-phase clouds. We performed several sets of 12-hour simulations to examine model sensitivity to different ice initiation mechanisms and evaluate model output (hydrometeors concentrations, contents, effective radii, precipitation fluxes, and radar reflectivity) against measurements from the MPACE Intensive Observing Period. Overall, the model qualitatively simulates ice crystal concentration and hydrometeors content, but it fails to predict quantitatively the effective radii of ice particles and their vertical profiles. In particular, the ice effective radii are overestimated by at least 50%. However, using the same definition as used for observations, the effective radii simulated and that observed were more comparable. We find that for the single-layer stratiform mixed-phase clouds simulated, process of ice phase initiation due to freezing of supercooled water in both saturated and subsaturated (w.r.t. water) environments is as important as primary ice crystal origination from water vapor. We also find that the BFP is a process mainly responsible for the rates of glaciation of simulated clouds. These glaciation rates cannot be adequately represented by a water-ice saturation adjustment scheme that only depends on temperature and liquid and solid hydrometeors contents as is widely used in bulk microphysics schemes and are better represented by processes that also account for supersaturation changes as the hydrometeors grow.

Sednev, I.; Menon, S.; McFarquhar, G.

2009-04-10T23:59:59.000Z

125

Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms  

SciTech Connect

The importance of Arctic mixed-phase clouds on radiation and the Arctic climate is well known. However, the development of mixed-phase cloud parameterization for use in large scale models is limited by lack of both related observations and numerical studies using multidimensional models with advanced microphysics that provide the basis for understanding the relative importance of different microphysical processes that take place in mixed-phase clouds. To improve the representation of mixed-phase cloud processes in the GISS GCM we use the GISS single-column model coupled to a bin resolved microphysics (BRM) scheme that was specially designed to simulate mixed-phase clouds and aerosol-cloud interactions. Using this model with the microphysical measurements obtained from the DOE ARM Mixed-Phase Arctic Cloud Experiment (MPACE) campaign in October 2004 at the North Slope of Alaska, we investigate the effect of ice initiation processes and Bergeron-Findeisen process (BFP) on glaciation time and longevity of single-layer stratiform mixed-phase clouds. We focus on observations taken during 9th-10th October, which indicated the presence of a single-layer mixed-phase clouds. We performed several sets of 12-h simulations to examine model sensitivity to different ice initiation mechanisms and evaluate model output (hydrometeors concentrations, contents, effective radii, precipitation fluxes, and radar reflectivity) against measurements from the MPACE Intensive Observing Period. Overall, the model qualitatively simulates ice crystal concentration and hydrometeors content, but it fails to predict quantitatively the effective radii of ice particles and their vertical profiles. In particular, the ice effective radii are overestimated by at least 50%. However, using the same definition as used for observations, the effective radii simulated and that observed were more comparable. We find that for the single-layer stratiform mixed-phase clouds simulated, process of ice phase initiation due to freezing of supercooled water in both saturated and undersaturated (w.r.t. water) environments is as important as primary ice crystal origination from water vapor. We also find that the BFP is a process mainly responsible for the rates of glaciation of simulated clouds. These glaciation rates cannot be adequately represented by a water-ice saturation adjustment scheme that only depends on temperature and liquid and solid hydrometeors contents as is widely used in bulk microphysics schemes and are better represented by processes that also account for supersaturation changes as the hydrometeors grow.

Sednev, Igor; Sednev, I.; Menon, S.; McFarquhar, G.

2008-02-18T23:59:59.000Z

126

A Model for the Thickness and Salinity of the Upper Layer in the Arctic Ocean and the Relationship between the Ice Thickness and Some External Parameters  

Science Conference Proceedings (OSTI)

This paper presents a dynamical model for the salinity and thickness of the upper layer in the Arctic. The parameters are the river runoff to the Arctic, the buoyancy supply through the Bering Strait, the export of ice from the Arctic and a ...

Anders Stigebrandt

1981-10-01T23:59:59.000Z

127

Modeling Sea Ice as a Granular Material, Including the Dilatancy Effect  

Science Conference Proceedings (OSTI)

A dynamic sea ice model based on granular material rheology is presented. The sea ice model is coupled to both a mixed layer ocean model and a one-layer thermodynamic atmospheric model, which allows for an ice albedo feedback. Land is represented ...

L-B. Tremblay; L. A. Mysak

1997-11-01T23:59:59.000Z

128

Sea-Ice Drift on the Northeastern Shelf of Sakhalin Island  

Science Conference Proceedings (OSTI)

Ice-drift velocity records from coastal radar stations, combined with data from moored current meters and coastal wind stations, are used to examine sea-ice motion off the northeastern coast of Sakhalin Island in the Sea of Okhotsk. Ice motion is ...

Georgy V. Shevchenko; Alexander B. Rabinovich; Richard E. Thomson

2004-11-01T23:59:59.000Z

129

A Semianalytic Energy Balance Climate Model with Explicit Sea Ice and Snow Physics  

Science Conference Proceedings (OSTI)

An energy balance climate model (EBCM) is presented having 1) a seasonal cycle; 2) surface-air, land-sea, and latitudinal resolution; 3) simulation of sea ice in terms of a number of explicit physical processes and in such a way that the sea ice ...

L. D. Danny Harvey

1988-11-01T23:59:59.000Z

130

Spatial and Temporal Variations in Antarctic Sea-Ice (1973–82)  

Science Conference Proceedings (OSTI)

Monthly estimates of Antarctic sea-ice area for the past decade were extracted from operational churts. Empirical orthogonal function analyses of these satellite-derived data revealed the existence of six distinct ice area sub-regions. Comparison ...

Chester F. Ropelewski

1983-03-01T23:59:59.000Z

131

The Role of Oceans and Sea Ice in Abrupt Transitions between Multiple Climate States  

Science Conference Proceedings (OSTI)

The coupled climate dynamics underlying large, rapid, and potentially irreversible changes in ice cover are studied. A global atmosphere–ocean–sea ice general circulation model with idealized aquaplanet geometry is forced by gradual multi-...

Brian E. J. Rose; David Ferreira; John Marshall

2013-05-01T23:59:59.000Z

132

Sea Ice and Current Response to the Wind: A Vector Regressional Analysis Approach  

Science Conference Proceedings (OSTI)

The authors describe a two-dimensional (vector) regressional model for examining the anisotropic response of ice drift and ocean current velocity (“drift velocity”) to surface wind forcing. Illustration of the method is limited to sea ice ...

Alexander B. Rabinovich; Georgy V. Shevchenko; Richard E. Thomson

2007-06-01T23:59:59.000Z

133

The Role of Oceans and Sea Ice in Abrupt Transitions between Multiple Climate States  

E-Print Network (OSTI)

The coupled climate dynamics underlying large, rapid, and potentially irreversible changes in ice cover are studied. A global atmosphere–ocean–sea ice general circulation model with idealized aquaplanet geometry is forced ...

Rose, Brian E. J.

134

Sea Ice Brightness Temperature as a Function of Ice Thickness, Part II: Computed curves for thermodynamically modelled ice profiles  

E-Print Network (OSTI)

Ice thickness is an important variable for climate scientists and is still an unsolved problem for satellite remote sensing specialists. There has been some success detecting the thickness of thin ice from microwave radiometers, and with this in mind this study attempts to model the thickness-radiance relation of sea ice at frequencies employed by the Soil Moisture and Ocean Salinity (SMOS) radiometer and the Advanced Microwave Scanning Radiometer (AMSR): between 1.4 and 89 GHz. In the first part of the study, the salinity of the ice was determined by a pair of empirical relationships, while the temperature was determined by a thermodynamic model. Because the thermodynamic model can be used as a simple ice growth model, in this, second part, the salinities are determined by the growth model. Because the model uses two, constant-weather scenarios representing two extremes ("fall freeze-up" and "winter cold snap"), brine expulsion is modelled with a single correction-step founded on mass conservation. The growt...

Mills, Peter

2012-01-01T23:59:59.000Z

135

Intermittent Intense Turbulent Mixing under Ice in the Laptev Sea Continental Shelf  

Science Conference Proceedings (OSTI)

Vertical mixing in the bottom boundary layer and pycnocline of the Laptev Sea is evaluated from a rapidly sampled 12-h time series of microstructure temperature, conductivity, and shear observations collected under 100% sea ice during October ...

Yueng-Djern Lenn; Tom P. Rippeth; Chris P. Old; Sheldon Bacon; Igor Polyakov; Vladimir Ivanov; Jens Hölemann

2011-03-01T23:59:59.000Z

136

Impact of Enthalpy-Based Ensemble Filtering Sea Ice Data Assimilation on Decadal Predictions: Simulation with a Conceptual Pycnocline Prediction Model  

Science Conference Proceedings (OSTI)

The non-Gaussian probability distribution of sea ice concentration makes it difficult to directly assimilate sea ice observations into a climate model. Because of the strong impact of the atmospheric and oceanic forcing on the sea ice state, any ...

S. Zhang; M. Winton; A. Rosati; T. Delworth; B. Huang

2013-04-01T23:59:59.000Z

137

Using A-Train Arctic cloud observations to constrain and improve...  

NLE Websites -- All DOE Office Websites (Extended Search)

radiation anomalies to the 2007 Arctic sea ice loss Jennifer E. Kay 1,2 Andrew Gettelman 1 , Tristan L'Ecuyer 2 ,Graeme Stephens 2 , and Chris O'Dell 2 1 National Center for...

138

Wind-Driven Variability of the Large-Scale Recirculating Flow in the Nordic Seas and Arctic Ocean  

Science Conference Proceedings (OSTI)

The varying depth-integrated currents in the Nordic seas and Arctic Ocean are modeled using an integral equation derived from the shallow-water equations. This equation assumes that mass divergence in the surface Ekman layer is balanced by ...

Pål E. Isachsen; J. H. LaCasce; C. Mauritzen; S. Häkkinen

2003-12-01T23:59:59.000Z

139

Creation of a Heat and Salt Flux Dataset Associated with Sea Ice Production and Melting in the Sea of Okhotsk  

Science Conference Proceedings (OSTI)

Sea ice formation, its transport, and its melting cause the redistribution of heat and salt, which plays an important role in the climate and biogeochemical systems. In the Sea of Okhotsk, a heat and salt flux dataset is created in which such sea ...

Sohey Nihashi; Kay I. Ohshima; Noriaki Kimura

2012-04-01T23:59:59.000Z

140

Employing Satellite-Derived Sea Ice Concentration to Constrain Upper-Ocean Temperature in a Global Ocean GCM  

Science Conference Proceedings (OSTI)

The quality of Southern Ocean sea ice simulations in a global ocean general circulation model (GCM) depends decisively on the simulated upper-ocean temperature. This is confirmed by assimilating satellite-derived sea ice concentration to ...

Achim Stössel

2008-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Influence of the Sea Ice Thickness Distribution on Polar Climate in CCSM3  

Science Conference Proceedings (OSTI)

The sea ice simulation of the Community Climate System Model version 3 (CCSM3) T42-gx1 and T85-gx1 control simulations is presented and the influence of the parameterized sea ice thickness distribution (ITD) on polar climate conditions is ...

Marika M. Holland; Cecilia M. Bitz; Elizabeth C. Hunke; William H. Lipscomb; Julie L. Schramm

2006-06-01T23:59:59.000Z

142

On the Consistent Scaling of Terms in the Sea-Ice Dynamics Equation  

Science Conference Proceedings (OSTI)

The standard way in which the sea-ice dynamics equation is used in models assumes that the wind stress and ocean drag do not depend on the sea-ice concentration. It is demonstrated that this assumption is inconsistent with the free-drift limit, ...

W. M. Connolley; J. M. Gregory; E. Hunke; A. J. McLaren

2004-07-01T23:59:59.000Z

143

Can North Atlantic Sea Ice Anomalies Account for Dansgaard–Oeschger Climate Signals?  

Science Conference Proceedings (OSTI)

North Atlantic sea ice anomalies are thought to play an important role in the abrupt Dansgaard–Oeschger (D–O) cycles of the last glacial period. This model study investigates the impacts of changes in North Atlantic sea ice extent in glacial ...

Camille Li; David S. Battisti; Cecilia M. Bitz

2010-10-01T23:59:59.000Z

144

Discrete-element model for the interaction between ocean waves and sea ice  

SciTech Connect

We present a discrete element method (DEM) model to simulate the mechanical behavior of sea ice in response to ocean waves. The wave/ice interaction can potentially lead to the fracture and fragmentation of sea ice depending on the wave amplitude and period. The fracture behavior of sea ice is explicitly modeled by a DEM method, where sea ice is modeled by densely packed spherical particles with finite size. These particles are bonded together at their contact points through mechanical bonds that can sustain both tensile & compressive forces and moments. Fracturing can be naturally represented by the sequential breaking of mechanical bonds. For a given amplitude and period of incident ocean wave, the model provides information for the spatial distribution and time evolution of stress and micro-fractures and the fragment size distribution. We demonstrate that the fraction of broken bonds,, increases with increasing wave amplitude. In contrast, the ice fragment size decreases with increasing amplitude.

Xu, Zhijie; Tartakovsky, Alexandre M.; Pan, Wenxiao

2012-01-05T23:59:59.000Z

145

Collaborative Research: Towards Advanced Understanding and Predictive Capability of Climate Change in the Arctic using a High-Resolution Regional Arctic Climate System Model  

Science Conference Proceedings (OSTI)

Primary activities are reported in these areas: climate system component studies via one-way coupling experiments; development of the Regional Arctic Climate System Model (RACM); and physical feedback studies focusing on changes in Arctic sea ice using the fully coupled model.

Lettenmaier, Dennis P

2013-04-08T23:59:59.000Z

146

Development of an Antarctic Regional Climate System Model. Part I: Sea Ice and Large-Scale Circulation  

Science Conference Proceedings (OSTI)

A coupled atmosphere–ice regional model previously used for simulations in the Arctic has been implemented in the Antarctic. Three 14-month simulations were performed for 1988–89, with different oceanic specifications. The year 1988 was ...

David A. Bailey; Amanda H. Lynch

2000-04-01T23:59:59.000Z

147

Generated using version 3.0 of the official AMS LATEX template Multiple sea ice states and hysteresis in an oceanic general  

E-Print Network (OSTI)

as other variables) during the increasing land ice phase is very different from the sea ice area during the decreasing land ice phase. Our results thus support the sea ice switch mechanism, which predictsGenerated using version 3.0 of the official AMS LATEX template Multiple sea ice states

Ashkenazy, Yossi "Yosef"

148

Eggs Show Arctic Mercury Cycling May Be Linked to Ice Cover  

Science Conference Proceedings (OSTI)

... cycling of mercury in the Arctic biosphere. Credit: D. Roseneau, US Fish and Wildlife Service View hi-resolution image. ...

2011-01-20T23:59:59.000Z

149

Surface Albedo of the Antarctic Sea Ice Zone  

Science Conference Proceedings (OSTI)

In three ship-based field experiments, spectral albedos were measured at ultraviolet, visible, and near-infrared wavelengths for open water, grease ice, nilas, young “grey” ice, young grey-white ice, and first-year ice, both with and without snow ...

Richard E. Brandt; Stephen G. Warren; Anthony P. Worby; Thomas C. Grenfell

2005-09-01T23:59:59.000Z

150

Sea Ice Simulations Based on Fields Generated by the GLAS GCM  

Science Conference Proceedings (OSTI)

A four-month simulation of the thermodynamic portion of the Parkinson-Washington sea ice model was conducted using atmospheric boundary conditions that were obtained from a pre-computed seasonal simulation of the Goddard Laboratory for ...

Claire L. Parkinson; Gerald F. Herman

1980-12-01T23:59:59.000Z

151

Iceberg Severity of Eastern North America: Its Relationship to Sea Ice Variability and Climate Change  

Science Conference Proceedings (OSTI)

Iceberg trajectory, deterioration (mass loss), and sea ice data are reviewed to identify the sources of observed interannual and seasonal variations in the numbers of icebergs passing south of 48°N off eastern North America. The results show the ...

S. R. Marko; D. B. Fissel; P. Wadhams; P. M. Kelly; R. D. Brown

1994-09-01T23:59:59.000Z

152

Observed Interaction between Pacific Sea Ice and the Western Pacific Pattern on Intraseasonal Time Scales  

Science Conference Proceedings (OSTI)

The relationship between North Pacific sea ice and the Western Pacific (WP) pattern is examined using wintertime observational data between 1978 and 2008. Weekly averaged data are chosen to capture the characteristically short time scale of the ...

N. Joss Matthewman; Gudrun Magnusdottir

2011-10-01T23:59:59.000Z

153

Antarctic Sea Ice Climatology, Variability, and Late Twentieth-Century Change in CCSM4  

Science Conference Proceedings (OSTI)

A preindustrial control run and an ensemble of twentieth-century integrations of the Community Climate System Model, version 4 (CCSM4), are evaluated for Antarctic sea ice climatology, modes of variability, trends, and covariance with related ...

Laura Landrum; Marika M. Holland; David P. Schneider; Elizabeth Hunke

2012-07-01T23:59:59.000Z

154

On Well-Posedness of the Viscous–Plastic Sea Ice Model  

Science Conference Proceedings (OSTI)

This study examines the well-posedness of the initial-value problems that arise in common models of sea ice. The model equations describe the balance of linear momentum combined with simplified thermodynamics represented by two continuity ...

Oksana Guba; Jens Lorenz; Deborah Sulsky

2013-10-01T23:59:59.000Z

155

Sea Ice-Edge Enhancement Using Polar-Orbiting Environmental Satellite Data  

Science Conference Proceedings (OSTI)

The authors develop and discuss satellite image enhancements of sea ice boundaries to the north and west of Alaska. Using data from the NOAA Advanced Very High Resolution Radiometer (AVHRR), the authors illustrate how a pixel-by-pixel difference ...

Thomas F. Lee; Susan Atwater; Charles Samuels

1993-09-01T23:59:59.000Z

156

Transient Climate Change in the CSIRO Coupled Model with Dynamic Sea Ice  

Science Conference Proceedings (OSTI)

The CSIRO coupled model has been used in a “transient” greenhouse experiment. This model contains atmospheric, oceanic, comprehensive sea-ice (dynamic/thermodynamic plus leads), and biospheric submodels. The model control run (over 100 years long)...

Hal B. Gordon; Siobhan P. O’Farrell

1997-05-01T23:59:59.000Z

157

Observed Feedback between Winter Sea Ice and the North Atlantic Oscillation  

Science Conference Proceedings (OSTI)

Feedback between the North Atlantic Oscillation (NAO) and winter sea ice variability is detected and quantified using approximately 30 years of observations, a vector autoregressive model (VAR), and testable definitions of Granger causality and ...

Courtenay Strong; Gudrun Magnusdottir; Hal Stern

2009-11-01T23:59:59.000Z

158

The Granular Sea Ice Model in Spherical Coordinates and Its Application to a Global Climate Model  

Science Conference Proceedings (OSTI)

The granular sea ice model (GRAN) from Tremblay and Mysak is converted from Cartesian to spherical coordinates. In this conversion, the metric terms in the divergence of the deviatoric stress and in the strain rates are included. As an ...

Jan Sedlacek; Jean-François Lemieux; Lawrence A. Mysak; L. Bruno Tremblay; David M. Holland

2007-12-01T23:59:59.000Z

159

The GFDL CM3 Coupled Climate Model: Characteristics of the Ocean and Sea Ice Simulations  

Science Conference Proceedings (OSTI)

This paper documents time mean simulation characteristics from the ocean and sea ice components in a new coupled climate model developed at the NOAA Geophysical Fluid Dynamics Laboratory (GFDL). The GFDL Climate Model version 3 (CM3) is formulated ...

Stephen M. Griffies; Michael Winton; Leo J. Donner; Larry W. Horowitz; Stephanie M. Downes; Riccardo Farneti; Anand Gnanadesikan; William J. Hurlin; Hyun-Chul Lee; Zhi Liang; Jaime B. Palter; Bonita L. Samuels; Andrew T. Wittenberg; Bruce L. Wyman; Jianjun Yin; Niki Zadeh

2011-07-01T23:59:59.000Z

160

Role of the Molecular Sublayer in the Melting or Freezing of Sea Ice  

Science Conference Proceedings (OSTI)

In an earlier paper, a second-moment turbulence closure model was applied to the problem of the dynamic and thermodynamic interaction of sea ice and the ocean surface mixed layer. An overly simplistic parameterization of the molecular sublayers ...

Michael Steele; George L. Mellor; Miles G. Mcphee

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Interdecadal Variability in a Hybrid Coupled Ocean–Atmosphere–Sea Ice Model  

Science Conference Proceedings (OSTI)

Interdecadal climate variability in an idealized coupled ocean–atmosphere–sea-ice model is studied. The ocean component is a fully three-dimensional primitive equation model and the atmospheric component is a two-dimensional (2D) energy balance ...

S. Kravtsov; M. Ghil

2004-07-01T23:59:59.000Z

162

Field Observations of the Bering Sea Ice Edge Properties during March 1979  

Science Conference Proceedings (OSTI)

During March 1979 field observations in the Bering Sea show that because of the interaction of winds and ocean swell with the ice, the ice edge divides into three distinct zones. First, adjacent to the open ocean is an “edge" zone, 1–15 km in ...

Jane Bauer; Seelye Martin

1980-12-01T23:59:59.000Z

163

Development of Exhibit on Arctic Climate Change Called The Arctic: A Friend Acting Strangely Exhibition  

SciTech Connect

The exhibition, The Arctic: A Friend Acting Strangely, was developed at the Smithsonian Institution’s National Museum of Natural History (NMNH) as a part of the museum’s Forces of Change exhibit series on global change. It opened to the public in Spring 2006, in conjunction with another Forces of Change exhibit on the Earth’s atmosphere called Change Is in the Air. The exhibit was a 2000 square-foot presentation that explored the forces and consequences of the changing Arctic as documented by scientists and native residents alike. Native peoples of the Arctic have always lived with year-to-year fluctuations in weather and ice conditions. In recent decades, they have witnessed that the climate has become unpredictable, the land and sea unfamiliar. An elder in Arctic Canada recently described the weather as uggianaqtuq —an Inuit word that can suggest strange, unexpected behavior, sometimes described as that of “a friend acting strangely.” Scientists too have been documenting dramatic changes in the Arctic. Air temperatures have warmed over most—though not all—of the Arctic since the 1950s; Arctic precipitation may have increased by as much as 8%; seasonal melting of the Greenland Ice Sheet has increased on average by 16% since 1979; polar-orbiting satellites have measured a 15¬–20% decline in sea ice extent since the 1970s; aircraft reconnaissance and ship observations show a steady decrease in sea ice since the 1950s. In response to this warming, plant distributions have begun to shift and animals are changing their migration routes. Some of these changes may have beneficial effects while others may bring hardship or have costly implications. And, many scientists consider arctic change to be a ‘bell-weather’ for large-scale changes in other regions of the world. The exhibition included text, photos artifacts, hands-on interactives and other exhibitry that illustrated the changes being documented by indigenous people and scientists alike.

Stauffer, Barbara W.

2006-04-01T23:59:59.000Z

164

Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms  

E-Print Network (OSTI)

M. : Role of a parameterized ice-phase mi- crophysics in anof contact nucleation in ice phase initiation in clouds, J.simulated, process of ice phase initiation due to freezing

Sednev, I.

2008-01-01T23:59:59.000Z

165

Simulating mixed-phase Arctic stratus clouds: Sensitivity to ice initiation mechanisms  

E-Print Network (OSTI)

M. : Role of a parameterized ice-phase micro- physics in anconcentration (N i ) for ice phase in experiments with icei L ?1 Table 8. Composite ice phase effective radius (R ei )

Sednev, I.

2009-01-01T23:59:59.000Z

166

Analysis and Forecasting of Sea Ice Conditions with Three-Dimensional Variational Data Assimilation and a Coupled Ice–Ocean Model  

Science Conference Proceedings (OSTI)

A three-dimensional variational data assimilation (3DVAR) system has been developed to provide analyses of the ice–ocean state and to initialize a coupled ice–ocean numerical model for forecasting sea ice conditions. This study focuses on the ...

Alain Caya; Mark Buehner; Tom Carrieres

2010-02-01T23:59:59.000Z

167

Effect of Sea Ice on the Salinity of Antarctic Bottom Waters  

Science Conference Proceedings (OSTI)

Brine rejection during the formation of Antarctic sea ice is known to enhance the salinity of dense shelf waters in the Weddell and Ross Seas. As these shelf waters flow off the shelves and descend to the bottom, they entrain ambient deep water ...

J. R. Toggweiler; B. Samuels

1995-09-01T23:59:59.000Z

168

Sea Ice Identification and Derivation of Its Velocity Field by X-Band Doppler Radar  

Science Conference Proceedings (OSTI)

In this study a 3D scanning X-band Doppler radar (XDR) was deployed near the coast of the Sea of Okhotsk, Hokkaido, Japan, in November 2005 to simultaneously observe sea ice and snow clouds. Doppler radars are commonly used to detect wind fields ...

Yasushi Fujiyoshi; Koji Osumi; Masayuki Ohi; Yoshinori Yamada

2013-06-01T23:59:59.000Z

169

Large-Scale Patterns and Variability of Snowmelt and Parameterized Surface Albedo in the Arctic Basin  

Science Conference Proceedings (OSTI)

Visible-band satellite imagery is used to manually map surface brightness changes over sea ice throughout the Arctic Basin from May to mid-August over a 10-yr period. These brightness changes are primarily due to snowmelt atop the ice cover. ...

David A. Robinson; Mark C. Serreze; Roger G. Barry; Greg Scharfen; George Kukla

1992-10-01T23:59:59.000Z

170

Autonomous Underwater Vehicle Measurements of Surface Wave Decay and Directional Spectra in the Marginal Sea Ice Zone  

Science Conference Proceedings (OSTI)

In March 2003 several autonomous underwater vehicle (AUV) missions were carried out under sea ice in the western Bellingshausen Sea. Data from the upward-looking acoustic Doppler current profiler (ADCP) on the “Autosub” AUV indicate a strongly ...

Daniel R. Hayes; Adrian Jenkins; Stephen McPhail

2007-01-01T23:59:59.000Z

171

Molecular-dynamics simulation of clustering processes in sea-ice floes  

E-Print Network (OSTI)

In seasonally ice-covered seas and along the margins of perennial ice pack, i.e. in regions with medium ice concentrations, the ice cover typically consists of separate floes interacting with each other by inelastic collisions. In this paper, hitherto unexplored analogies between this type of ice cover and two-dimensional granular gases are used to formulate a model of ice dynamics at the floe level. The model consists of: (i) momentum equations for floe motion between collisions, formulated in the form of a Stokes-flow problem, with floe-size dependent time constant and equilibrium velocity, and (ii) hard-disk collision model. The numerical algorithm developed is suitable for simulating particle-laden flow of $N$ disk-shaped floes with arbitrary size distribution. The model is applied to study clustering phenomena in sea ice with power-law floe-size distribution. In particular, the influence of the average ice concentration $\\bar{A}$ on the formation and characteristics of clusters is analyzed in detail. The...

Herman, Agnieszka

2011-01-01T23:59:59.000Z

172

Predicting Land-Ice Retreat and Sea-Level Rise with the Community Earth System Model  

SciTech Connect

Coastal stakeholders need defensible predictions of 21st century sea-level rise (SLR). IPCC assessments suggest 21st century SLR of {approx}0.5 m under aggressive emission scenarios. Semi-empirical models project SLR of {approx}1 m or more by 2100. Although some sea-level contributions are fairly well constrained by models, others are highly uncertain. Recent studies suggest a potential large contribution ({approx}0.5 m/century) from the marine-based West Antarctic Ice Sheet, linked to changes in Southern Ocean wind stress. To assess the likelihood of fast retreat of marine ice sheets, we need coupled ice-sheet/ocean models that do not yet exist (but are well under way). CESM is uniquely positioned to provide integrated, physics based sea-level predictions.

Lipscomb, William [Los Alamos National Laboratory

2012-06-19T23:59:59.000Z

173

Climate Model Simulations of Effects of Increased Atmospheric CO2 and Loss of Sea Ice on Ocean Salinity and Tracer Uptake  

Science Conference Proceedings (OSTI)

Recent observations show a decrease in the extent of Northern Hemisphere sea ice; this decrease has been attributed to human activities. Climate model simulations are presented that examine how loss of sea ice affects the ocean salinity and ...

P. B. Duffy; M. Eby; A. J. Weaver

2001-02-01T23:59:59.000Z

174

Synoptic-Scale Influences of Snow Cover and Sea Ice  

Science Conference Proceedings (OSTI)

Daily observational data for thirty winters (1951–80) are used to test the hypothesis that anomalous distributions of snow and ice cover influence the intensification and/or trajectories of synoptic-scale cyclones. The pools of objectively chosen ...

Becky Ross; John E. Walsh

1986-10-01T23:59:59.000Z

175

Slope-Enhanced Fission of Salty Hetons under Sea Ice  

Science Conference Proceedings (OSTI)

Ocean responses to a single brine source under ice and over a sloping bottom are investigated in numerical experiments. Brine sources considered herein are often much stronger than that anticipated from a single seawater freezing event in a time ...

Shenn-Yu Chao; Ping-Tung Shaw

2000-11-01T23:59:59.000Z

176

Factors Influencing Simulated Changes in Future Arctic Cloudiness  

Science Conference Proceedings (OSTI)

This study diagnoses the changes in Arctic clouds simulated by the Community Climate System Model version 3 (CCSM3) in a transient 2 × CO2 simulation. Four experiments—one fully coupled and three with prescribed SSTs and/or sea ice cover—are used ...

Stephen J. Vavrus; Uma S. Bhatt; Vladimir A. Alexeev

2011-09-01T23:59:59.000Z

177

Simulating mixed-phase Arctic stratus clouds: Sensitivity to ice initiation mechanisms  

E-Print Network (OSTI)

parameterization in BRM scheme accounts for two general mech- anisms distinguishable according to the involvement of liquid phase in the ice

Sednev, I.

2009-01-01T23:59:59.000Z

178

Southern Ocean Climate and Sea Ice Anomalies Associated with the Southern Oscillation  

Science Conference Proceedings (OSTI)

The anomalies in the climate and sea ice cover of the Southern Ocean and their relationships with the Southern Oscillation (SO) are investigated using a 17-yr dataset from 1982 to 1998. The polar climate anomalies are correlated with the Southern ...

R. Kwok; J. C. Comiso

2002-03-01T23:59:59.000Z

179

Linearity of the Atmospheric Response to North Atlantic SST and Sea Ice Anomalies  

Science Conference Proceedings (OSTI)

The observations of the ocean–atmosphere–sea ice have recently revealed that the oceanic surfaces can have a subtle but significant impact on the atmospheric long-term fluctuations. Low-frequency variations and long-term trends of the North ...

Sébastien Conil; Laurent Z-X. Li

2005-06-01T23:59:59.000Z

180

An Initial Assessment of Antarctic Sea Ice Extent in the CMIP5 Models  

Science Conference Proceedings (OSTI)

This paper examines the annual cycle and trends in Antarctic sea ice extent (SIE) for 18 models used in phase 5 of the Coupled Model Intercomparison Project (CMIP5) that were run with historical forcing for the 1850s to 2005. Many of the models ...

John Turner; Thomas J. Bracegirdle; Tony Phillips; Gareth J. Marshall; J. Scott Hosking

2013-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Performance Analysis of a Multiprocessor Coupled Ice–Ocean Model for the Baltic Sea  

Science Conference Proceedings (OSTI)

Within the Swedish Regional Climate Modelling Programme (SWECLIM) a 3D coupled ice–ocean model for the Baltic Sea has been developed to simulate physical processes on timescales of hours to decades. The model code is based on the global ocean GCM ...

H. E. Markus Meier; Torgny Faxén

2002-01-01T23:59:59.000Z

182

The Influence of Sea Ice on Ocean Heat Uptake in Response to Increasing CO2  

Science Conference Proceedings (OSTI)

Two significant changes in ocean heat uptake that occur in the vicinity of sea ice cover in response to increasing CO2 are investigated with Community Climate System Model version 3 (CCSM3): a deep warming below 500 m and extending down several ...

C. M. Bitz; P. R. Gent; R. A. Woodgate; M. M. Holland; R. Lindsay

2006-06-01T23:59:59.000Z

183

Modeling the Effects of Wind Redistribution on the Snow Mass Budget of Polar Sea Ice  

Science Conference Proceedings (OSTI)

A two-dimensional numerical model of blowing snow specifically designed for sea ice environments is presented. This new model is used to quantify the snow mass lost because of blowing snow into leads, blowing snow sublimation, and the effects of ...

Stephen J. Déry; L-B. Tremblay

2004-01-01T23:59:59.000Z

184

Ocean Heat Transport, Sea Ice, and Multiple Climate States: Insights from Energy Balance Models  

Science Conference Proceedings (OSTI)

Several extensions of energy balance models (EBMs) are explored in which (i) sea ice acts to insulate the atmosphere from the ocean and (ii) ocean heat transport is allowed to have some meridional structure controlled by the wind, with minima at ...

Brian E. J. Rose; John Marshall

2009-09-01T23:59:59.000Z

185

Bailey, D. A., P. B. Rhines, and S. Hkkinen, 2005: Formation and pathways of North Atlantic Deep Water in a coupled ice-ocean model of the Arctic-North Atlantic Oceans. Climate  

E-Print Network (OSTI)

Water in a coupled ice-ocean model of the Arctic-North Atlantic Oceans. Climate Dyn., 25, doi:10.1007/s. P. Shen, World Scientific, Singapore, 360pp. Yeh, S.- W., and B. P. Kirtman, 2005: Pacific decadal

186

Temporal Variability of the Energy Balance of Thick Arctic Pack Ice  

Science Conference Proceedings (OSTI)

The temporal variability of the six terms of the energy balance equation for a slab of ice 3 m thick is calculated based on 45 yr of surface meteorological observations from the drifting ice stations of the former Soviet Union. The equation ...

R. W. Lindsay

1998-03-01T23:59:59.000Z

187

Chinese Journal of Polar Science, Vol. 19, No.2, 168 -184, December 2008 Modeling seasonal variations of ocean and sea ice circulation in  

E-Print Network (OSTI)

variations of ocean and sea ice circulation in the Beaufort and Chukchi Seas: A model-data fusion study Wang the formation of the cold saline layer due to the injection of salt during sea ice formation, the BSC, model-data fusion. 1 Introduction The Beaufort and Chukchi seas (Fig. 1) are an important region where

188

A View of Antarctic Ice-Sheet Evolution from Sea-Level and Deep-Sea Isotope Changes During the Late Cretaceous-Cenozoic  

E-Print Network (OSTI)

The imperfect direct record of Antarctic glaciation has led to the delayed recognition of the initiation of a continent-sized ice sheet. Early studies interpreted initiation in the middle Miocene (ca 15 Ma). Most current studies place the first ice sheet in the earliest Oligocene (33.55 Ma), but there is physical evidence for glaciation in the Eocene. Though there are inherent limitations in sea-level and deep-sea isotope records, both place constraints on the size and extent of Late Cretaceous to Cenozoic Antarctic ice sheets. Sea-level records argue that small- to medium-size (typically 10-12 × 106 km3) ephemeral ice sheets occurred during the greenhouse world of the Late Cretaceous to middle Eocene. Deep-sea ?18O records show increases associated with many of these greenhouse sea-level falls, consistent with their attribution to ice-sheet growth. Global cooling began in the middle Eocene and culminated with the major earliest Oligocene (33.55 Ma) growth of a large (25 × 106 km3) Antarctic ice sheet that caused a 55-70 m eustatic fall and a 1‰ ?18O increase. This large ice sheet became a driver of climate change, not just a response to it, causing increased latitudinal thermal gradients and a spinning up of the oceans that, in turn, caused a dramatic reorganization of ocean circulation and chemistry.

Miller, K. G.; Wright, J. D.; Katz, M. E.; Browning, J. V.; Cramer, B. S.; Wade, Bridget S.; Mizintseva, S. F.

2008-01-01T23:59:59.000Z

189

Anomalies and Trends of Sea-Ice Extent and Atmospheric Circulation in the Nordic Seas during the Period 1864–1998  

Science Conference Proceedings (OSTI)

The extent of ice in the Nordic Seas measured in April has decreased by 33% over the past 135 yr. Retrospective comparison indicates that the recent decrease in the ice extent is within the range of variability observed since the eighteenth ...

Torgny Vinje

2001-02-01T23:59:59.000Z

190

Amplified Inception of European Little Ice Age by Sea Ice–Ocean–Atmosphere Feedbacks  

Science Conference Proceedings (OSTI)

The inception of the Little Ice Age (~1400–1700 AD) is believed to have been driven by an interplay of external forcing and climate system internal variability. While the hemispheric signal seems to have been dominated by solar irradiance and ...

Flavio Lehner; Andreas Born; Christoph C. Raible; Thomas F. Stocker

2013-10-01T23:59:59.000Z

191

Amplified inception of European Little Ice Age by sea ice-ocean-atmosphere feedbacks  

Science Conference Proceedings (OSTI)

The inception of the Little Ice Age (~1400-1700 AD) is believed to have been driven by an interplay of external forcing and climate system-internal variability. While the hemispheric signal seems to have been dominated by solar irradiance and ...

Flavio Lehner; Andreas Born; Christoph C. Raible; Thomas F. Stocker

192

Projected Changes to the Southern Hemisphere Ocean and Sea Ice in the IPCC AR4 Climate Models  

Science Conference Proceedings (OSTI)

Fidelity and projected changes in the climate models, used for the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4), are assessed with regard to the Southern Hemisphere extratropical ocean and sea ice systems. While ...

Alexander Sen Gupta; Agus Santoso; Andréa S. Taschetto; Caroline C. Ummenhofer; Jessica Trevena; Matthew H. England

2009-06-01T23:59:59.000Z

193

The Relative Importance of Clouds and Sea Ice for the Solar Energy Budget of the Southern Ocean  

Science Conference Proceedings (OSTI)

The effects of clouds and sea ice on the solar radiation budget are determined for the Southern Ocean around Antarctica between latitudes 50° and 80°S. Distributions of cloud optical depth are used, together with distributions of surface albedo, ...

Melanie F. Fitzpatrick; Stephen G. Warren

2007-03-01T23:59:59.000Z

194

Southern Hemisphere Synoptic Behavior in Extreme Phases of SAM, ENSO, Sea Ice Extent, and Southern Australia Rainfall  

Science Conference Proceedings (OSTI)

The association between Southern Hemisphere cyclones and anticyclones and the El Niño–Southern Oscillation (ENSO), southern annular mode (SAM), Antarctic sea ice extent (SIE), and rainfall in Perth and Melbourne is explored. Those cities are, ...

Alexandre Bernardes Pezza; Tom Durrant; Ian Simmonds; Ian Smith

2008-11-01T23:59:59.000Z

195

A Simple Coupled Atmosphere–Ocean–Sea Ice–Land Surface Model for Climate and Paleoclimate Studies  

Science Conference Proceedings (OSTI)

The authors develop a coupled atmosphere–ocean–sea ice–land surface model for long-term climate change studies that incorporates the seasonal cycle. Three ocean basins, the Antarctic Circumpolar Current region, and the major continents are ...

Zhaomin Wang; Lawrence A. Mysak

2000-03-01T23:59:59.000Z

196

Mesoscale Nowcasting of Sea Ice Movement through the Bering Strait with a Description of Major Driving Forces  

Science Conference Proceedings (OSTI)

Surface atmospheric pressure data from a triangular station network surrounding the Bering Strait are used to calculate hypothetical geostrophic wind velocities. Net daily Strait sea ice movement is derived from visible and infrared NOAA ...

Thomas L. Kozo; William J. Stringer; Lenora J. Torgerson

1987-01-01T23:59:59.000Z

197

Ice Formation in Arctic Mixed-Phase Clouds: Insights from a 3-D Cloud-Resolving Model with Size-Resolved Aerosol and Cloud Microphysics  

SciTech Connect

The single-layer mixed-phase clouds observed during the Atmospheric Radiation Measurement (ARM) program’s Mixed-Phase Arctic Cloud Experiment (MPACE) are simulated with a 3-dimensional cloud-resolving model the System for Atmospheric Modeling (SAM) coupled with an explicit bin microphysics scheme and a radar-lidar simulator. Two possible ice enhancement mechanisms – activation of droplet evaporation residues by condensation-followed-by-freezing and droplet freezing by contact freezing inside-out, are scrutinized by extensive comparisons with aircraft and radar and lidar measurements. The locations of ice initiation associated with each mechanism and the role of ice nuclei (IN) in the evolution of mixed-phase clouds are mainly addressed. Simulations with either mechanism agree well with the in-situ and remote sensing measurements on ice microphysical properties but liquid water content is slightly underpredicted. These two mechanisms give very similar cloud microphysical, macrophysical, dynamical, and radiative properties, although the ice nucleation properties (rate, frequency and location) are completely different. Ice nucleation from activation of evaporation nuclei is most efficient near cloud top areas concentrated on the edges of updrafts, while ice initiation from the drop freezing process has no significant location preference (occurs anywhere that droplet evaporation is significant). Both enhanced nucleation mechanisms contribute dramatically to ice formation with ice particle concentration of 10-15 times higher relative to the simulation without either of them. The contribution of ice nuclei (IN) recycling from ice particle evaporation to IN and ice particle concentration is found to be very significant in this case. Cloud can be very sensitive to IN initially and form a nonquilibrium transition condition, but become much less sensitive as cloud evolves to a steady mixed-phase condition. The parameterization of Meyers et al. [1992] with the observed MPACE IN concentration is able to predict the observed mixed-phase clouds reasonably well. This validation may facilitate the application of this parameterization in the cloud and climate models to simulate Arctic clouds.

Fan, Jiwen; Ovtchinnikov, Mikhail; Comstock, Jennifer M.; McFarlane, Sally A.; Khain, Alexander

2009-02-27T23:59:59.000Z

198

Origins and Levels of Seasonal Forecast Skill for Sea Ice in Hudson Bay Using Canonical Correlation Analysis  

Science Conference Proceedings (OSTI)

Canonical correlation analysis (CCA) is used to estimate the levels and sources of seasonal forecast skill for July ice concentration in Hudson Bay over the 1971–2005 period. July is an important transition month in the seasonal cycle of sea ice ...

Adrienne Tivy; Stephen E. L. Howell; Bea Alt; John J. Yackel; Thomas Carrieres

2011-03-01T23:59:59.000Z

199

Temperature and Melt Modeling on the Prince of Wales Ice Field, Canadian High Arctic  

Science Conference Proceedings (OSTI)

Near-surface temperature variability and net annual mass balance were monitored from May 2001 to April 2003 in a network of 25 sites on the Prince of Wales Ice Field, Ellesmere Island, Canada. The observational array spanned an area of 180 km by ...

Shawn J. Marshall; Martin J. Sharp

2009-03-01T23:59:59.000Z

200

Status of and Outlook for Large-Scale Modeling of Atmosphere–Ice–Ocean Interactions in the Arctic  

Science Conference Proceedings (OSTI)

Arctic air masses have direct impacts on the weather and climatic extremes of midlatitude areas such as central North America. Arctic physical processes pose special and very important problems for global atmospheric models used for climate ...

David Randall; Judith Curry; David Battisti; Gregory Flato; Robert Grumbine; Sirpa Hakkinen; Doug Martinson; Ruth Preller; John Walsh; John Weatherly

1998-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

The Elastic–Viscous–Plastic Sea Ice Dynamics Model in General Orthogonal Curvilinear Coordinates on a Sphere—Incorporation of Metric Terms  

Science Conference Proceedings (OSTI)

A new discretization for the elastic–viscous–plastic (EVP) sea ice dynamics model incorporates metric terms to account for grid curvature effects in curvilinear coordinate systems. A fundamental property of the viscous–plastic ice rheology that ...

Elizabeth C. Hunke; John K. Dukowicz

2002-07-01T23:59:59.000Z

202

Chemical and Physical Properties of Atmospheric Aerosols (a) A Case Study in the Unique Properties of Agricultural Aerosols (b) The Role of Chemical Composition in Ice Nucleation during the Arctic Spring  

E-Print Network (OSTI)

This study focuses on the analysis of atmospheric particles sampled from two different field campaigns: the field study at a cattle feeding facility in the summer from 2005 to 2008 and the Indirect and Semi-Direct Aerosol Campaign (ISDAC) in 2008. A ground site field study at a representative large cattle feeding facility in the Texas Panhandle was conducted to characterize the particle size distributions, hygroscopicity, and chemical composition of agricultural aerosols. Here, a first comprehensive dataset is reported for these physical and chemical properties of agricultural aerosols appropriate for use in a site-specific emission inventory. The emission rate and transport of the aerosols are also discussed. In addition, mixing ratios of total and gaseous ammonia were measured at the same field in 2007 and 2008. Measurements such as these provide a means to determine whether the fugitive dust emitted from a typical large feedlot represents a health concern for employees of the feeding operation and the nearby community. Detailed chemical composition of aircraft-sampled particles collected during ISDAC was studied. Filter samples were collected under a variety of conditions in and out of mixed phase and ice clouds in the Arctic. Specifically, particles were sampled from a mixed-phase cloud during a period of observed high concentrations of ice nuclei (IN), a biomass plume, and under relatively clean ambient conditions. Composition of particles was studied on a particle-by-particle basis using several microspectroscopy techniques. Based on the elemental composition analysis, more magnesium was found in Arctic cloud residues relative to ambient air. Likewise, based on the carbon speciation analysis, high IN samples contained coated inorganics, carbonate, and black or brown carbon particles. In the samples collected during a flight through a biomass burning plume, water-soluble organic carbon was the dominant overall composition. Due to their hygroscopic nature, these organics may preferably act as cloud condensation nuclei (CCN) rather than IN. Other ambient samples contained relatively higher fractions of organic and inorganic mixtures and less purely water-soluble organics than found in the biomass particles. The most likely source of inorganics would be sea salt. When present, sea salt may further enhance ice nucleation.

Moon, Seong-Gi

2010-05-01T23:59:59.000Z

203

Antarctic benthic and sea-ice microalgal interactions: food chain processes and physiology  

DOE Green Energy (OSTI)

Annual sea-ice in McMurdo Sound is known to provide an extensive microhabitat for microalgae containing a high biomass within the lower 5 cm at the water/ice interface, with an estimated annual production of 4.1 g of carbon/m/sup 2/. Upon senescence, this microalgal population contributes a large amount of C to the benthic biota. Total biomass as measured by membrane phospholipids of benthic microorganisms from three sites in McMurdo Sound were comparable to those of a Florida estuary and greater than those of deep-sea trenches. In addition to total biomass, changes in community structure of the sediments at the McMurdo study sites of Cape Evans, Cape Armitage, and New Harbor are detectable by detailed fatty-acid profiles of phospholipid membranes. These data are comparable to studies of the benthic macrofauna from McMurdo Sound which indicated that the east Sound sites are more productive than the west. The east Sound sediment sites were found to contain the greatest amount of the phospholipid fatty acid which is a major component of the sea-ice diatom Nitzschia cylindrus. Bacterial biomarkers indicated little difference in total biomass between the sites but did reveal community structure differences. Saturated, branched, and odd carbon fatty acids, were present in similar relative proportions. Fatty acids from triglyceride and sterols from the neutral lipid fractions of the sediments indicated a similar pattern to that of the phospholipid biomasses, with the east Sound sites containing greater amounts. Metabolic activities at the sites were measured by their incorporation of radiolabeled precursors into bacterial DNA and lipid classes. Lipid and metabolic activity monitoring has proven to be a useful technique in ice algal physiology studies.

Smith, G.A.; White, D.C.; Nichols, P.D.

1986-01-01T23:59:59.000Z

204

Simulations of Arctic mixed-phase clouds using a new aerosol-linked ice nuclei parameterization in a prognostic ice prediction scheme.  

E-Print Network (OSTI)

??Despite the nearly universally-accepted notion that the Arctic is one of the most important areas to fully understand in the face of a changing global… (more)

Carpenter, James Michael

2013-01-01T23:59:59.000Z

205

The Effects of North Atlantic SST and Sea Ice Anomalies on the Winter Circulation in CCM3. Part II: Direct and Indirect Components of the Response  

Science Conference Proceedings (OSTI)

The wintertime atmospheric circulation responses to observed patterns of North Atlantic sea surface temperature and sea ice cover trends in recent decades are studied by means of experiments with an atmospheric general circulation model. Here the ...

Clara Deser; Gudrun Magnusdottir; R. Saravanan; Adam Phillips

2004-03-01T23:59:59.000Z

206

A Method of Detecting Change in the Ice Conditions of the Central Greenland Sea by the Whelping Locations of Harp Seals  

Science Conference Proceedings (OSTI)

Variations in the extent of sea ice within the Greenland Sea on daily, seasonal, or longer time scales are well documented, while changes in ice conditions are not. By combining historical information on the location and timing of the hunt for ...

J. P. Wilkinson; P. Wadhams

2005-04-01T23:59:59.000Z

207

Winter Weather Patterns over Northern Eurasia and Arctic Sea Ice Loss  

Science Conference Proceedings (OSTI)

Using the NCEP/NCAR and Japanese (JRA-25) re-analysis winter daily (Dec. 1 to Feb. 28) data for the period 1979 to 2012, this paper reveals the leading pattern of winter daily 850 hPa wind variability over northern Eurasia from a dynamic ...

Bingyi Wu; Dörthe Handorf; Klaus Dethloff; Annette Rinke; Aixue Hu

208

Winter Weather Patterns over Northern Eurasia and Arctic Sea Ice Loss  

Science Conference Proceedings (OSTI)

Using NCEP–NCAR reanalysis and Japanese 25-yr Reanalysis (JRA-25) winter daily (1 December–28 February) data for the period 1979–2012, this paper reveals the leading pattern of winter daily 850-hPa wind variability over northern Eurasia from a ...

Bingyi Wu; Dörthe Handorf; Klaus Dethloff; Annette Rinke; Aixue Hu

2013-11-01T23:59:59.000Z

209

The dependence of ice microphysics on aerosol concentration in arctic mixed-phase stratus clouds during ISDAC and M-PACE  

SciTech Connect

Cloud and aerosol data acquired by the National Research Council of Canada (NRC) Convair-580 aircraft in, above, and below single-layer arctic stratocumulus cloud during the Indirect and Semi-Direct Aerosol Campaign (ISDAC) in April 2008 were used to test three aerosol indirect effects hypothesized to act in mixed-phase clouds: the riming indirect effect, the glaciation indirect effect, and the cold second indirect effect. The data showed a correlation of R= 0.75 between liquid drop number concentration, Nliq, inside cloud and ambient aerosol number concentration NPCASP below cloud. This, combined with increasing liquid water content LWC with height above cloud base and the nearly constant profile of Nliq, suggested that liquid drops were nucleated from aerosol at cloud base. No strong evidence of a riming indirect effect was observed, but a strong correlation of R = 0.69 between ice crystal number concentration Ni and NPCASP above cloud was noted. Increases in ice nuclei (IN) concentration with NPCASP above cloud combined with the subadiabatic LWC profiles suggest possible mixing of IN from cloud top consistent with the glaciation indirect effect. The higher Nice and lower effective radius rel for the more polluted ISDAC cases compared to data collected in cleaner single-layer stratocumulus conditions during the Mixed-Phase Arctic Cloud Experiment is consistent with the operation of the cold second indirect effect. However, more data in a wider variety of meteorological and surface conditions, with greater variations in aerosol forcing, are required to identify the dominant aerosol forcing mechanisms in mixed-phase arctic clouds.

Jackson, Robert C.; McFarquhar, Greg; Korolev, Alexei; Earle, Michael; Liu, Peter S.; Lawson, R. P.; Brooks, Sarah D.; Wolde, Mengistu; Laskin, Alexander; Freer, Matthew

2012-08-14T23:59:59.000Z

210

Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

Ice Ice Nature Bulletin No. 661-A january 7, 1978 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation ICE There was a time when ice, cut on frozen ponds and lakes, was transported by fast clipper ships from New England to New Orleans where it was worth its weight in gold. Nowadays this cold brittle colorless substance is commonplace everywhere. Few people, however, know that ice is one of the strangest of all solids; and that, because of its unique properties, life on earth is what it is. Those properties are due to the distinctive structure of a molecule of water, formed of three elemental particles or atoms -- two of hydrogen and one of oxygen -- expressed by the familiar symbol, H2O. The three atoms are held together by two chemical bonds expressed by another symbol, H-O-H. Briefly, the unique properties of water, water vapor, and ice arise from that bonding and the arrangement of electron pairs around the oxygen atom.

211

Stable isotopes in benthic foraminiferal calcite from a river-influenced Arctic marine environment, Kara and Pechora Seas  

E-Print Network (OSTI)

the World Ocean [e.g., Aagard and Car- mack, 1994]. During glacial periods, the Arctic hydro- graphic

Howat, Ian M.

212

Short-Term Climatic Variability of the Arctic  

Science Conference Proceedings (OSTI)

The circulation of the Arctic atmosphere undergoes large fluctuations about its monthly and annual means. The statistics of Arctic sea level pressure and temperature are evaluated in order to place Arctic atmospheric variability into the context ...

John E. Walsh; William L. Chapman

1990-02-01T23:59:59.000Z

213

A FIRE-ACE/SHEBA Case Study of Mixed-Phase Arctic Boundary Layer Clouds: Entrainment Rate Limitations on Rapid Primary Ice Nucleation Processes  

Science Conference Proceedings (OSTI)

Observations of long-lived mixed-phase Arctic boundary layer clouds on 7 May 1998 during the First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment (FIRE)–Arctic Cloud Experiment (ACE)/Surface Heat Budget of the Arctic ...

Ann M. Fridlind; Bastiaan van Diedenhoven; Andrew S. Ackerman; Alexander Avramov; Agnieszka Mrowiec; Hugh Morrison; Paquita Zuidema; Matthew D. Shupe

2012-01-01T23:59:59.000Z

214

A New Double-Moment Microphysics Parameterization for Application in Cloud and Climate Models. Part II: Single-Column Modeling of Arctic Clouds  

E-Print Network (OSTI)

of the arctic bound- ary layer, the presence of leads (cracks) in the sea ice surface, the persistence of mixed-phaseA New Double-Moment Microphysics Parameterization for Application in Cloud and Climate Models. Part- dicted cloud boundaries and total cloud fraction compare reasonably well with observations. Cloud phase

Zuidema, Paquita

215

Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska  

E-Print Network (OSTI)

High Arctic permafrosted soils represent a massive sink in the global carbon cycle, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This dissertation summarizes the results of the first study to look at long term, fine scale organic carbon delivery by the high-Arctic Colville River into Simpson’s Lagoon in the near-shore Beaufort Sea. Modern delivery of organic carbon to the Lagoon was determined to come from a variety of sources through the use of a three end-member mixing model and sediment biomarker concentrations. These sources include the Colville River in the western area of the Lagoon near the river mouth, marine sources in areas of the Lagoon without protective barrier islands, and coastal erosional sources and the Mackenzie River in the eastern area of the Lagoon. Downcore organic carbon delivery was measured on two cores in the Lagoon, one taken near the mouth of the Colville River (spans about 1800 years of history) and one taken on the eastern end of the Lagoon (spans about 600 years of history). Bulk organic parameters and biomarkers were measured in both cores and analyzed with Principle Component Analysis to determine long-term trends in organic carbon delivery. It was shown that at various times in the past, highly degraded organic carbon inputs of what is likely soil and peat carbon were delivered to the Lagoon. At other times, inputs of fresher, non-degraded, terrestrially-derived organic carbon inputs of what are likely higher amounts of plant and vegetative material was delivered to the Lagoon. Inputs of degraded soil carbon were also shown to correspond to higher temperatures on the North Slope of Alaska, likely indicating that warmer temperatures lead to a thawing of permafrost and in turn organic carbon mobilization to the coastal Beaufort Sea.

Schreiner, Kathryn 1983-

2013-05-01T23:59:59.000Z

216

Preliminary Geospatial Analysis of Arctic Ocean Hydrocarbon Resources  

SciTech Connect

Ice coverage of the Arctic Ocean is predicted to become thinner and to cover less area with time. The combination of more ice-free waters for exploration and navigation, along with increasing demand for hydrocarbons and improvements in technologies for the discovery and exploitation of new hydrocarbon resources have focused attention on the hydrocarbon potential of the Arctic Basin and its margins. The purpose of this document is to 1) summarize results of a review of published hydrocarbon resources in the Arctic, including both conventional oil and gas and methane hydrates and 2) develop a set of digital maps of the hydrocarbon potential of the Arctic Ocean. These maps can be combined with predictions of ice-free areas to enable estimates of the likely regions and sequence of hydrocarbon production development in the Arctic. In this report, conventional oil and gas resources are explicitly linked with potential gas hydrate resources. This has not been attempted previously and is particularly powerful as the likelihood of gas production from marine gas hydrates increases. Available or planned infrastructure, such as pipelines, combined with the geospatial distribution of hydrocarbons is a very strong determinant of the temporal-spatial development of Arctic hydrocarbon resources. Significant unknowns decrease the certainty of predictions for development of hydrocarbon resources. These include: 1) Areas in the Russian Arctic that are poorly mapped, 2) Disputed ownership: primarily the Lomonosov Ridge, 3) Lack of detailed information on gas hydrate distribution, and 4) Technical risk associated with the ability to extract methane gas from gas hydrates. Logistics may control areas of exploration more than hydrocarbon potential. Accessibility, established ownership, and leasing of exploration blocks may trump quality of source rock, reservoir, and size of target. With this in mind, the main areas that are likely to be explored first are the Bering Strait and Chukchi Sea, in spite of the fact that these areas do not have highest potential for future hydrocarbon reserves. Opportunities for improving the mapping and assessment of Arctic hydrocarbon resources include: 1) Refining hydrocarbon potential on a basin-by-basin basis, 2) Developing more realistic and detailed distribution of gas hydrate, and 3) Assessing the likely future scenarios for development of infrastructure and their interaction with hydrocarbon potential. It would also be useful to develop a more sophisticated approach to merging conventional and gas hydrate resource potential that considers the technical uncertainty associated with exploitation of gas hydrate resources. Taken together, additional work in these areas could significantly improve our understanding of the exploitation of Arctic hydrocarbons as ice-free areas increase in the future.

Long, Philip E.; Wurstner, Signe K.; Sullivan, E. C.; Schaef, Herbert T.; Bradley, Donald J.

2008-10-01T23:59:59.000Z

217

The Assimilation of Observations from the Advanced Microwave Sounding Unit over Sea Ice in the French Global Numerical Weather Prediction System  

Science Conference Proceedings (OSTI)

The aim of this study is to test the feasibility of assimilating microwave observations from the Advanced Microwave Sounding Units (AMSU-A and AMSU-B) through the implementation of an appropriate parameterization of sea ice emissivity. AMSU ...

Fatima Karbou; Florence Rabier; Catherine Prigent

2014-01-01T23:59:59.000Z

218

The Effect of the Sea Ice Freshwater Flux on Southern Ocean Temperatures in CCSM3: Deep-Ocean Warming and Delayed Surface Warming  

Science Conference Proceedings (OSTI)

This study explores the role of sea ice freshwater and salt fluxes in modulating twenty-first-century surface warming in the Southern Ocean via analysis of sensitivity experiments in the Community Climate System Model, version 3 (CCSM3). In ...

Clark H. Kirkman IV; Cecilia M. Bitz

2011-05-01T23:59:59.000Z

219

Extreme Anomalous Atmospheric Circulation in the West Antarctic Peninsula Region in Austral Spring and Summer 2001/02, and Its Profound Impact on Sea Ice and Biota  

Science Conference Proceedings (OSTI)

Exceptional sea ice conditions occurred in the West Antarctic Peninsula (WAP) region from September 2001 to February 2002, resulting from a strongly positive atmospheric pressure anomaly in the South Atlantic coupled with strong negative ...

Robert A. Massom; Sharon E. Stammerjohn; Raymond C. Smith; Michael J. Pook; Richard A. Iannuzzi; Neil Adams; Douglas G. Martinson; Maria Vernet; William R. Fraser; Langdon B. Quetin; Robin M. Ross; Yuko Massom; H. Roy Krouse

2006-08-01T23:59:59.000Z

220

Collaborative Research: Towards Advanced Understanding and Predictive Capability of Climate Change in the Arctic Using a High-Resolution Regional Arctic Climate Model  

SciTech Connect

The primary research task completed for this project was the development of the Regional Arctic Climate Model (RACM). This involved coupling existing atmosphere, ocean, sea ice, and land models using the National Center for Atmospheric Research (NCAR) Community Climate System Model (CCSM) coupler (CPL7). RACM is based on the Weather Research and Forecasting (WRF) atmospheric model, the Parallel Ocean Program (POP) ocean model, the CICE sea ice model, and the Variable Infiltration Capacity (VIC) land model. A secondary research task for this project was testing and evaluation of WRF for climate-scale simulations on the large pan-Arctic model domain used in RACM. This involved identification of a preferred set of model physical parameterizations for use in our coupled RACM simulations and documenting any atmospheric biases present in RACM.

Cassano, John [Principal Investigator

2013-06-30T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Virtual Floe Ice Drift Forecast Model Intercomparison  

Science Conference Proceedings (OSTI)

Both sea ice forecast models and methods to measure their skill are needed for operational sea ice forecasting. Two simple sea ice models are described and tested here. Four different measures of skill are also tested. The forecasts from the ...

Robert W. Grumbine

1998-09-01T23:59:59.000Z

222

Void bounds for fluid transport in sea ice K.M. Golden a,*, A.L. Heaton a  

E-Print Network (OSTI)

cylindrical tubes occupying a volume fraction /, k 6 /hR4 I i 8hR2 I i . ð58� This bound is again optimal the d = 2 void bounds. Consider the steady state flow of a vis- cous fluid through a cylindrical tubeVoid bounds for fluid transport in sea ice K.M. Golden a,*, A.L. Heaton a , H. Eicken b , V

Golden, Kenneth M.

223

Ice at the Interface: Atmosphere-Ice-Ocean Boundary Layer Processes and Their Role in Polar Change---Workshop Report  

SciTech Connect

The atmosphere-ocean boundary layer in which sea ice resides includes many complex processes that require a more realistic treatment in GCMs, particularly as models move toward full earth system descriptions. The primary purpose of the workshop was to define and discuss such coupled processes from observational and modeling points of view, including insight from both the Arctic and Antarctic systems. The workshop met each of its overarching goals, including fostering collaboration among experimentalists, theorists and modelers, proposing modeling strategies, and ascertaining data availability and needs. Several scientific themes emerged from the workshop, such as the importance of episodic or extreme events, precipitation, stratification above and below the ice, and the marginal ice zone, whose seasonal Arctic migrations now traverse more territory than in the past.

Hunke, Elizabeth C. [Los Alamos National Laboratory

2012-07-23T23:59:59.000Z

224

Measurements of the Underside Topography of Sea Ice by Moored Subsea Sonar  

Science Conference Proceedings (OSTI)

A practical technology based on moored subsea instrumentation has been developed to measure the draft of polar pack ice. The technology exploits the complementary capabilities of an ice-profiling sonar designed and built for the application and ...

Humfrey Melling; Paul H. Johnston; David A. Riedel

1995-06-01T23:59:59.000Z

225

ICES Training programme The International Council for the Exploration of the Sea (ICES) offers courses led by high-profile scientists and  

E-Print Network (OSTI)

: +45 3338 6700 Fax: +45 3393 4215 info@ices.dk You can find more information about: ICES HQ here Hotels tuition fee. Organization The course is organized by the ICES Secretariat as part of the ICES Training

226

Archimedean Ice  

E-Print Network (OSTI)

The striking boundary dependency (the Arctic Circle phenomenon) exhibited in the ice model on the square lattice extends to other planar set-ups. We present these findings for the triangular and the Kagome lattices. Critical connectivity results guarantee that ice configurations can be generated using the simplest and most efficient local actions. Height functions are utilized throughout the analysis. At the end there is a surprise in store: on the remaining Archimedean lattice for which the ice model can be defined, the 3.4.6.4. lattice, the long range behavior is completely different from the other cases.

Kari Eloranta

2009-09-22T23:59:59.000Z

227

Mesoscale Modeling During Mixed-Phase Arctic Cloud Experiment  

SciTech Connect

Mixed-phase arctic stratus clouds are the predominant cloud type in the Arctic (Curry et al. 2000) and through various feedback mechanisms exert a strong influence on the Arctic climate. Perhaps one of the most intriguing of their features is that they tend to have liquid tops that precipitate ice. Despite the fact that this situation is colloidally unstable, these cloud systems are quite long lived - from a few days to over a couple of weeks. It has been hypothesized that mixed-phase clouds are maintained through a balance between liquid water condensation resulting from the cloud-top radiative cooling and ice removal by precipitation (Pinto 1998; Harrington et al. 1999). In their modeling study Harrington et al. (1999) found that the maintenance of this balance depends strongly on the ambient concentration of ice forming nucleus (IFN). In a follow-up study, Jiang et al. (2002), using only 30% of IFN concentration predicted by Meyers et al. (1992) IFN parameterization were able to obtain results similar to the observations reported by Pinto (1998). The IFN concentration measurements collected during the Mixed-Phase Arctic Cloud Experiment (M-PACE), conducted in October 2004 over the North Slope of Alaska and the Beaufort Sea (Verlinde et al. 2005), also showed much lower values then those predicted (Prenne, pers. comm.) by currently accepted ice nucleation parameterizations (e.g. Meyers et al. 1992). The goal of this study is to use the extensive IFN data taken during M-PACE to examine what effects low IFN concentrations have on mesoscale cloud structure and coastal dynamics.

Avramov, A.; Harringston, J.Y.; Verlinde, J.

2005-03-18T23:59:59.000Z

228

Melting Ice and Tangled Nets: Litigation and Conservation Policy in the US, Australia, and Canada  

E-Print Network (OSTI)

Melting Ice and Tangled Nets: Litigation and Conservationare heavily dependent on sea ice for their survival, both asvulnerable to the receding sea ice boundaries predicted to

Shaffer, Robert

2012-01-01T23:59:59.000Z

229

Modeling Global Sea Ice with a Thickness and Enthalpy Distribution Model in Generalized Curvilinear Coordinates  

Science Conference Proceedings (OSTI)

A parallel ocean and ice model (POIM) in generalized orthogonal curvilinear coordinates has been developed for global climate studies. The POIM couples the Parallel Ocean Program (POP) with a 12-category thickness and enthalpy distribution (TED) ...

Jinlun Zhang; D. A. Rothrock

2003-05-01T23:59:59.000Z

230

Direct Assimilation of AMSR-E Brightness Temperatures for Estimating Sea Ice Concentration  

Science Conference Proceedings (OSTI)

In this paper a method to directly assimilate brightness temperatures from the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) to produce ice concentration analyses within a three-dimensional variational data ...

K. Andrea Scott; Mark Buehner; Alain Caya; Tom Carrieres

2012-03-01T23:59:59.000Z

231

Multiparameter AVHRR-Derived Products for Arctic Climate Studies  

Science Conference Proceedings (OSTI)

Generation and sample applications of an integrated set of remotely sensed products for investigations of Arctic climate are described. Cloud fraction, ice surface temperature, surface albedo, downwelling radiative fluxes, ice motion vectors, and ...

Walter N. Meier; James A. Maslanik; Charles W. Fowler; Jeffrey R. Key

1997-01-01T23:59:59.000Z

232

Arctic Circle Mediterranean Sea  

E-Print Network (OSTI)

#12;· Albania · Bosnia and Herzegovina · Bulgaria · Croatia · Former Yugoslav Republic of Macedonia #12;Romania 52.5%Slovenia 26.4% Bulgaria 16.0% Croatia 2.7% Bosnia and Herzegovina 1.2% Serbia Bosnia and Herzegovina Serbia and Montenegro Albania 0 2 4 6 8 10 12 $USMillion 2001 2002 2003 2004 2005

233

The assimilation of observations from the Advanced Microwave Sounding Unit over sea ice in the French global Numerical Weather Prediction system  

Science Conference Proceedings (OSTI)

The aim of this study is to test the feasibility of assimilating microwave observations from AMSU-A and AMSU-B through the implementation of an appropriate parameterization of sea ice emissivity. AMSU observations are relevant to describe the air ...

Fatima Karbou; Florence Rabier; Catherine Prigent

234

Present-Day and Last-Glacial-Maximum Ocean Thermohaline Circulation in a Zonally Averaged Coupled Ocean–Sea-Ice–Atmosphere Model  

Science Conference Proceedings (OSTI)

A simple ocean–atmosphere model suitable for long-term paleoclimate studies is presented. It consists of a three-basin zonally averaged ocean model coupled to an energy moisture-balance atmospheric model and a thermodynamic sea-ice model. The ...

H. Bjornsson; L. A. Mysak

2001-04-01T23:59:59.000Z

235

The Response of the Polar Regions to Increased CO2 in a Global Climate Model with Elastic–Viscous–Plastic Sea Ice  

Science Conference Proceedings (OSTI)

A global atmosphere–ocean–sea ice general circulation model (GCM) is used in simulations of climate with present-day atmospheric CO2 concentrations, and with CO2 increasing to double the present-day values. The Parallel Climate Model includes the ...

John W. Weatherly; Yuxia Zhang

2001-02-01T23:59:59.000Z

236

A Numerical Study of an Extreme Cold-Air Outbreak over the Labrador Sea: Sea Ice, Air–Sea Interaction, and Development of Polar Lows  

Science Conference Proceedings (OSTI)

In this paper, the ability of the MM5 mesoscale forecast model to simulate the air–sea interaction, boundary layer development, and mesoscale structure associated with a cold-air outbreak over the Labrador Sea is investigated. The case chosen was ...

Mariusz Pagowski; G. W. K. Moore

2001-01-01T23:59:59.000Z

237

Parameterization of the Extinction Coefficient in Ice and Mixed-Phase Arctic Clouds during the ISDAC Field Campaign  

SciTech Connect

This report documents the history of attempts to directly measure cloud extinction, the current measurement device known as the Cloud Extinction Probe (CEP), specific problems with direct measurement of extinction coefficient, and the attempts made here to address these problems. Extinction coefficient is one of the fundamental microphysical parameters characterizing bulk properties of clouds. Knowledge of extinction coefficient is of crucial importance for radiative transfer calculations in weather prediction and climate models given that Earth's radiation budget (ERB) is modulated much by clouds. In order for a large-scale model to properly account for ERB and perturbations to it, it must ultimately be able to simulate cloud extinction coefficient well. In turn this requires adequate and simultaneous simulation of profiles of cloud water content and particle habit and size. Similarly, remote inference of cloud properties requires assumptions to be made about cloud phase and associated single-scattering properties, of which extinction coefficient is crucial. Hence, extinction coefficient plays an important role in both application and validation of methods for remote inference of cloud properties from data obtained from both satellite and surface sensors (e.g., Barker et al. 2008). While estimation of extinction coefficient within large-scale models is relatively straightforward for pure water droplets, thanks to Mie theory, mixed-phase and ice clouds still present problems. This is because of the myriad forms and sizes that crystals can achieve, each having their own unique extinction properties. For the foreseeable future, large-scale models will have to be content with diagnostic parametrization of crystal size and type. However, before they are able to provide satisfactory values needed for calculation of radiative transfer, they require the intermediate step of assigning single-scattering properties to particles. The most basic of these is extinction coefficient, yet it is rarely measured directly, and therefore verification of parametrizations is difficult. The obvious solution is to be able to measure microphysical properties and extinction at the same time and for the same volume. This is best done by in situ sampling by instruments mounted on either balloon or aircraft. The latter is the usual route and the one employed here. Yet the problem of actually measuring extinction coefficient directly for arbitrarily complicated particles still remains unsolved.

Korolev, A; Shashkov, A; Barker, H

2012-03-06T23:59:59.000Z

238

Parameterization of the Extinction Coefficient in Ice and Mixed-Phase Arctic Clouds during the ISDAC Field Campaign  

SciTech Connect

This report documents the history of attempts to directly measure cloud extinction, the current measurement device known as the Cloud Extinction Probe (CEP), specific problems with direct measurement of extinction coefficient, and the attempts made here to address these problems. Extinction coefficient is one of the fundamental microphysical parameters characterizing bulk properties of clouds. Knowledge of extinction coefficient is of crucial importance for radiative transfer calculations in weather prediction and climate models given that Earth's radiation budget (ERB) is modulated much by clouds. In order for a large-scale model to properly account for ERB and perturbations to it, it must ultimately be able to simulate cloud extinction coefficient well. In turn this requires adequate and simultaneous simulation of profiles of cloud water content and particle habit and size. Similarly, remote inference of cloud properties requires assumptions to be made about cloud phase and associated single-scattering properties, of which extinction coefficient is crucial. Hence, extinction coefficient plays an important role in both application and validation of methods for remote inference of cloud properties from data obtained from both satellite and surface sensors (e.g., Barker et al. 2008). While estimation of extinction coefficient within large-scale models is relatively straightforward for pure water droplets, thanks to Mie theory, mixed-phase and ice clouds still present problems. This is because of the myriad forms and sizes that crystals can achieve, each having their own unique extinction properties. For the foreseeable future, large-scale models will have to be content with diagnostic parametrization of crystal size and type. However, before they are able to provide satisfactory values needed for calculation of radiative transfer, they require the intermediate step of assigning single-scattering properties to particles. The most basic of these is extinction coefficient, yet it is rarely measured directly, and therefore verification of parametrizations is difficult. The obvious solution is to be able to measure microphysical properties and extinction at the same time and for the same volume. This is best done by in situ sampling by instruments mounted on either balloon or aircraft. The latter is the usual route and the one employed here. Yet the problem of actually measuring extinction coefficient directly for arbitrarily complicated particles still remains unsolved.

Korolev, A; Shashkov, A; Barker, H

2012-03-06T23:59:59.000Z

239

8, 1175511819, 2008 mixed-phase Arctic  

E-Print Network (OSTI)

, process of ice phase initiation due to freezing of25 supercooled water in both saturatedACPD 8, 11755­11819, 2008 Simulating mixed-phase Arctic stratus clouds I. Sednev et al. Title Page.0 License. Atmospheric Chemistry and Physics Discussions Simulating mixed-phase Arctic stratus clouds

Paris-Sud XI, Université de

240

The influence of ice nucleation mode and ice vapor growth on simulation of  

NLE Websites -- All DOE Office Websites (Extended Search)

The influence of ice nucleation mode and ice vapor growth on simulation of The influence of ice nucleation mode and ice vapor growth on simulation of arctic mixed-phase clouds Avramov, Alexander The Pennsylvania State University Category: Modeling Mixed-phase arctic stratus clouds are the predominant cloud type in the Arctic . Perhaps one of the most intriguing of their features is that they tend to have liquid tops that precipitate ice. Despite the fact that this situation is colloidally unstable, these cloud systems are quite long lived - from a few days to over a couple of weeks. Previous studies have suggested that this longevity may be due to a paucity of ice nucleating aerosols (ice nuclei, or IN) in the Arctic. Such studies have shown that small changes in IN concentrations can cause large changes in the amount of liquid water within a mixed-phase stratus deck. We use the Regional

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Solar Radiative Heating in First Year Sea Ice M.J. McGuinness 1 , K.A. Landman 2 , H.J. Trodahl 3 , A.E. Pantoja 3  

E-Print Network (OSTI)

Solar Radiative Heating in First Year Sea Ice M.J. McGuinness 1 , K.A. Landman 2 , H.J. Trodahl 3 ice show daily oscillations consistent with heating by solar radiation. We present and solve a heat for solar power absorption based on Monte Carlo scatter­ ing simulations of penetrating photons. We observe

242

The Response of the Coupled Arctic Sea Ice–Atmosphere System to Orbital Forcing and Ice Motion at 6 kyr and 115 kyr BP  

Science Conference Proceedings (OSTI)

A coupled atmosphere–mixed layer ocean GCM (GENESIS2) is forced with altered orbital boundary conditions for paleoclimates warmer than modern (6 kyr BP) and colder than modern (115 kyr BP) in the high-latitude Northern Hemisphere. A pair of ...

Stephen J. Vavrus

1999-03-01T23:59:59.000Z

243

Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world  

E-Print Network (OSTI)

This dissertation discusses a linkage between the Southern Ocean (SO) winds and the global ocean circulation in the framework of a coarse-resolution global ocean general circulation model coupled to a sea-ice model. In addition to reexamination of the conventional linkage that begins with northward Ekman transport and extends to the North Atlantic (NA) overturning, the author investigates a new linkage that begins with the Southern Hemisphere (SH) sea-ice – ocean interaction perturbed by the anomalous SO winds and extends to the SH overturning, the response of the NA overturning, and the long-term baroclinic adjustment of the Antarctic Circumpolar Current (ACC). How the above two linkages will interact with each other in a warming world is also investigated. An interactive momentum flux forcing, allowing for the strength of momentum flux between atmosphere and sea ice to vary in response to the simulated sea-ice conditions, enhances wind-driven ice divergence to increase the fraction of leads and polynyas, which increases dense water formation, and thus intensifies convection. Within three experimental frameworks, this increased dense water consistently increases the Antarctic Bottom Water formation, which directly intensifies the SH overturning and indirectly weakens the NA overturning. As a result of the hemispheric change in overturning circulations, the meridional density gradient across the ACC appears to increase, ultimately increasing the baroclinic part of the ACC via an enhanced thermal wind shear. Subsequently, impacts of the poleward shifted and intensified SH subpolar westerly winds (SWWs) on the global ocean circulation are investigated in phases. When the SWWs are only shifted poleward, the effect of the anomalous winds is transmitted to the northern NA, decreasing both the NA overturning and the North Atlantic Deep Water (NADW) outflow. However, when the SWWs are shifted poleward and intensified, this effect is cut off by the intensified Deacon cell overturning, and is not transmitted to the northern NA, and instead increases the NADW outflow substantially. To sum up, with respect to the SO winds perturbed by the global warming, the SH overturning cell and the NADW outflow increase, leading to an increase in the volume transport of the ACC.

Cheon, Woo Geunn

2008-08-01T23:59:59.000Z

244

Trace metals in fucoid algae and purple sea urchins near a high arctic lead/zinc ore deposit  

SciTech Connect

Trace metal concentrations in fucoid algae and in purple sea urchins from the vicinity of a metal mining district on North Baffin Island were determined. Higher concentrations of iron and zinc were present in algae and urchins collected nearer the mining area than in those collected further away. Concentrations of copper, iron, and zinc in algae increased with tissue age; arsenic and cadmium were lowest in intermediate-age algae tissues. Tissue distributions of iron and zinc in urchins and algae illustrate the food chain relationship between these species. 7 references, 2 tables.

Bohn, A.

1979-11-01T23:59:59.000Z

245

A 20-year data set of surface longwave fluxes in the Arctic  

SciTech Connect

Creation of 20-year data set of surface infrared fluxes from satellite measurements. A reliable estimate of the surface downwelling longwave radiation flux (DLF) is a glaring void in available forcing data sets for models of Arctic sea ice and ocean circulation. We have developed a new method to estimate the DLF from a combination of satellite sounder retrievals and brightness temperatures from the TIROS Operational Vertical Sounder (TOVS), which has flown on NOAA polar-orbiting satellites continuously since late 1979. The overarching goal of this project was to generate a 20-year data set of surface downwelling longwave flux measurements from TOVS data over the Arctic Ocean. Daily gridded fields of DLF were produced with a spatial resolution of (100 km){sup 2} north of 60{sup o}N for 22.5 years rather than only 20. Surface measurements from the field station at Barrow, AK--part of the Atmospheric Radiation Measurement (ARM) Program --and from the Surface Heat Budget of the Arctic (SHEBA) were used to validate the satellite-derived fluxes and develop algorithm improvements for conditions that had resulted in systematic errors in early versions of the algorithm. The resulting data set has already been sent to two other investigators for incorporation into their research, and we will soon complete preparations to send the products to the National Snow and Ice Data Center and ARM data archive, where it can be disseminated to the scientific community.

Jennifer Francis

2004-06-15T23:59:59.000Z

246

AMOC: Acoustic monitoring of the ocean climate of the Arctic  

Science Conference Proceedings (OSTI)

The overall objective of AMOC is to develop and design an acoustic system for long?term monitoring of the ocean temperature and ice thickness in the Arctic Ocean including the Fram Strait

Ola M. Johannessen; AMOC Group

1999-01-01T23:59:59.000Z

247

Autumnal Mixed-Phase Cloudy Boundary Layers in the Arctic  

Science Conference Proceedings (OSTI)

Two mixed-phase cloudy boundary layer events observed over the Arctic ice pack in autumn are extensively analyzed. The local dynamic and thermodynamic structure of the boundary layers is determined from aircraft measurements including analysis of ...

James O. Pinto

1998-06-01T23:59:59.000Z

248

Near-Inertial Wave Propagation in the Western Arctic  

Science Conference Proceedings (OSTI)

From October 1997 through October 1998, the Surface Heat Budget of the Arctic (SHEBA) ice camp drifted across the western Arctic Ocean, from the central Canada Basin over the Northwind Ridge and across the Chukchi Cap. During much of this period, ...

Robert Pinkel

2005-05-01T23:59:59.000Z

249

An Observational Study of Sea Breezes Along the Alaskan Beaufort Sea Coast: Part I  

Science Conference Proceedings (OSTI)

Though sea breezes are not often associated with the arctic, atmospheric environmental data collected in August 1976, 1977 and 1979 along the Beaufort Sea Coast of Alaska offer both circumstantial and direct evidence of the existence of sea ...

Thomas L. Kozo

1982-07-01T23:59:59.000Z

250

Use of Synthetic Aperture Radar (SAR) to Identify and Characterize Overwintering Areas of Fish in Ice-Covered Arctic RIvers: A Demonstration with Broad Whitefish and their Habitats in the Sagavanirktok River, Alaska  

Science Conference Proceedings (OSTI)

In northern climates, locating overwintering fish can be very challenging due to thick ice cover. Areas near the coast of the Beaufort Sea provide valuable overwintering habitat for both resident and anadromous fish species; identifying and understanding their use of overwintering areas is of special interest. Synthetic aperture radar (SAR) imagery from two spaceborne satellites was examined as an alternative to radiotelemetry for identifying anadromous fish overwintering. The presence of water and ice were sampled at 162 sites and fish were sampled at 16 of these sites. From SAR imagery alone, we successfully identified large pools inhabited by overwintering fish in the ice-covered Sagavanirktok River. In addition, the imagery was able to identify all of the larger pools (mean minimum length of 138m (range 15-470 m; SD=131)) of water located by field sampling. The effectiveness of SAR to identify these pools varied from 31% to 100%, depending on imagery polarization, the incidence angle range, and the orbit. Horizontal transmit–vertical receive (HV) polarization appeared best. The accuracy of SAR was also assessed at a finer pixel-by-pixel (30-m x30-m) scale. The best correspondence at this finer scale was obtained with an image having HV polarization. The levels of agreement ranged from 54% to 69%. The presence of broad whitefish (the only anadromous species present) was associated with salinity and pool size (estimated with SAR imagery); fish were more likely to be found in larger pools with low salinity. This research illustrates that SAR imaging has great potential for identifying under-ice overwintering areas of riverine fish. These techniques should allow managers to identify critical overwintering areas with relatively more ease and lower cost than traditional techniques.

Brown, Richard S.; Duguay, Claude R.; Mueller, Robert P.; Moulton, Larry; Doucette, Peter J.; Tagestad, Jerry D.

2010-12-01T23:59:59.000Z

251

The Arctic as a test case for an assessment of climate impacts on national security.  

SciTech Connect

The Arctic region is rapidly changing in a way that will affect the rest of the world. Parts of Alaska, western Canada, and Siberia are currently warming at twice the global rate. This warming trend is accelerating permafrost deterioration, coastal erosion, snow and ice loss, and other changes that are a direct consequence of climate change. Climatologists have long understood that changes in the Arctic would be faster and more intense than elsewhere on the planet, but the degree and speed of the changes were underestimated compared to recent observations. Policy makers have not yet had time to examine the latest evidence or appreciate the nature of the consequences. Thus, the abruptness and severity of an unfolding Arctic climate crisis has not been incorporated into long-range planning. The purpose of this report is to briefly review the physical basis for global climate change and Arctic amplification, summarize the ongoing observations, discuss the potential consequences, explain the need for an objective risk assessment, develop scenarios for future change, review existing modeling capabilities and the need for better regional models, and finally to make recommendations for Sandia's future role in preparing our leaders to deal with impacts of Arctic climate change on national security. Accurate and credible regional-scale climate models are still several years in the future, and those models are essential for estimating climate impacts around the globe. This study demonstrates how a scenario-based method may be used to give insights into climate impacts on a regional scale and possible mitigation. Because of our experience in the Arctic and widespread recognition of the Arctic's importance in the Earth climate system we chose the Arctic as a test case for an assessment of climate impacts on national security. Sandia can make a swift and significant contribution by applying modeling and simulation tools with internal collaborations as well as with outside organizations. Because changes in the Arctic environment are happening so rapidly, a successful program will be one that can adapt very quickly to new information as it becomes available, and can provide decision makers with projections on the 1-5 year time scale over which the most disruptive, high-consequence changes are likely to occur. The greatest short-term impact would be to initiate exploratory simulations to discover new emergent and robust phenomena associated with one or more of the following changing systems: Arctic hydrological cycle, sea ice extent, ocean and atmospheric circulation, permafrost deterioration, carbon mobilization, Greenland ice sheet stability, and coastal erosion. Sandia can also contribute to new technology solutions for improved observations in the Arctic, which is currently a data-sparse region. Sensitivity analyses have the potential to identify thresholds which would enable the collaborative development of 'early warning' sensor systems to seek predicted phenomena that might be precursory to major, high-consequence changes. Much of this work will require improved regional climate models and advanced computing capabilities. Socio-economic modeling tools can help define human and national security consequences. Formal uncertainty quantification must be an integral part of any results that emerge from this work.

Taylor, Mark A.; Zak, Bernard Daniel; Backus, George A.; Ivey, Mark D.; Boslough, Mark Bruce Elrick

2008-11-01T23:59:59.000Z

252

Dynamics of Arctic and Sub-Arctic Climate and Atmospheric Circulation: Diagnosis of Mechanisms and Biases Using Data Assimilation  

SciTech Connect

This is the final report for DOE grant DE-FG02-07ER64434 to Eric DeWeaver at the University of Wisconsin-Madison. The overall goal of work performed under this grant is to enhance understanding of simulations of present-day climate and greenhouse gas-induced climate change. Enhanced understanding is desirable 1) as a prerequisite for improving simulations; 2) for assessing the credibility of model simulations and their usefulness as tools for decision support; and 3) as a means to identify robust behaviors which commonly occur over a wide range of models, and may yield insights regarding the dominant physical mechanisms which determine mean climate and produce climate change. A furthe objective is to investigate the use of data assimilation as a means for examining and correcting model biases. Our primary focus is on the Arctic, but the scope of the work was expanded to include the global climate system to the extent that research targets of opportunity present themselves. Research performed under the grant falls into five main research areas: 1) a study of data assimilation using an ensemble filter with the atmospheric circulation model of the National Center for Atmospheric Research, in which both conventional observations and observations of the refraction of radio waves from GPS satellites were used to constrain the atmospheric state of the model; 2) research on the likely future status of polar bears, in which climate model simluations were used to assess the effectiveness of climate change mitigation efforts in preserving the habitat of polar bears, now considered a threatened species under global warming; 3) as assessment of the credibility of Arctic sea ice thickness simulations from climate models; 4) An examination of the persistence and reemergence of Northern Hemisphere sea ice area anomalies in climate model simulations and in observations; 5) An examination of the roles played by changes in net radiation and surface relative humidity in determine the response of the hydrological cycle to global warming.

Eric T. DeWeaver

2010-01-19T23:59:59.000Z

253

Arctic house  

E-Print Network (OSTI)

Currently available housing in the Arctic is limited to solutions that have been adapted from designs for less severe climates. This thesis has developed a new manner of residential construction designed specifically for ...

Turkel, Joel A. (Joel Abram), 1969-

1999-01-01T23:59:59.000Z

254

Objectively Analyzed Air–Sea Heat Fluxes for the Global Ice-Free Oceans (1981–2005)  

Science Conference Proceedings (OSTI)

A 25-yr (1981–2005) time series of daily latent and sensible heat fluxes over the global ice-free oceans has been produced by synthesizing surface meteorology obtained from satellite remote sensing and atmospheric model reanalyses outputs. The ...

Lisan Yu; Robert A. Weller

2007-04-01T23:59:59.000Z

255

Wind, sea ice, inertial oscillations and upper ocean mixing in Marguerite Bay, Western Antarctic Peninsula : observations and modeling  

E-Print Network (OSTI)

Two years of moored oceanographic and automatic weather station data which span the winter ice seasons of 2001-2003 within Marguerite Bay on the western Antarctic Peninsula (wAP) shelf were collected as part of the Southern ...

Hyatt, Jason

2006-01-01T23:59:59.000Z

256

Arctic oil and natural gas resources - Today in Energy - U.S ...  

U.S. Energy Information Administration (EIA)

Wind › Geothermal › ... seals, whales, and other sea life. The adequacy of existing technology to manage offshore oil spills in an arctic environment is another ...

257

Black carbon aerosols and the third polar ice cap  

E-Print Network (OSTI)

EASE-Grid weekly snow cover and sea ice extent version 3.USA, National Snow and Ice Data Center, Digital media, 2005.climate forcing via snow and ice albedos, Proc. Natl. Acad.

Menon, Surabi

2010-01-01T23:59:59.000Z

258

Surface Heat Budget of the Arctic Ocean  

Science Conference Proceedings (OSTI)

A summary is presented of the Surface Heat Budget of the Arctic Ocean (SHEBA) project, with a focus on the field experiment that was conducted from October 1997 to October 1998. The primary objective of the field work was to collectocean, ice, ...

Taneil Uttal; Judith A. Curry; Miles G. Mcphee; Donald K. Perovich; Richard E. Moritz; James A. Maslanik; Peter S. Guest; Harry L. Stern; James A. Moore; Rene Turenne; Andreas Heiberg; Mark C. Serreze; Donald P. Wylie; Ola G. Persson; Clayton A. Paulson; Christopher Halle; James H. Morison; Patricia A. Wheeler; Alexander Makshtas; Harold Welch; Matthew D. Shupe; Janet M. Intrieri; Knut Stamnes; Ronald W. Lindsey; Robert Pinkel; W. Scott Pegau; Timothy P. Stanton; Thomas C. Grenfeld

2002-02-01T23:59:59.000Z

259

Global Ice and Land Climate Studies Using Scatterometer Image Data  

E-Print Network (OSTI)

in sea ice, and canopy leaf density--as well as by the phase state of water (meltwater on sea ice1 Global Ice and Land Climate Studies Using Scatterometer Image Data David G. Long Brigham Young CA 91109 ben@pacific.jpl.nasa.gov Sasan.Saatchi@jpl.nasa.gov Cheryl Bertoia U. S. National Ice Center

Long, David G.

260

Dynamics and energetics of the cloudy boundary layer in simulations of off-ice flow in the marginal ice zone  

E-Print Network (OSTI)

kinetic energy even in the present case where very strong surface heat fluxes occur. Ice-phase. Inclusion of the ice phase significantly affected the radiative budget as compared to purely liquid clouds, illustrating the importance of ice-phase­radiative couplings for accurate simulations of arctic clouds

Harrington, Jerry Y.

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

ice rheology in HadCM3  

E-Print Network (OSTI)

Abstract. We present results of an implementation of the Elastic Viscous Plastic (EVP) sea ice dynamics scheme into the Hadley Centre coupled ocean-atmosphere climate model HadCM3. Although the large-scale simulation of sea ice in HadCM3 is quite good with this model, the lack of a full dynamical model leads to errors in the detailed representation of sea ice and limits our confidence in its future predictions. We find that introducing the EVP scheme results in a worse initial simulation of the sea ice. This paper documents various enhancements made to improve the simulation, resulting in a sea ice simulation that is better than the original HadCM3 scheme overall. Importantly, it is more physically based and provides a more solid foundation for future development. We then consider the interannual variability of the sea ice in the new model and demonstrate improvements over the HadCM3 simulation. 1

W. M. Connolley; A. B. Keen; A. J. Mclaren

2006-01-01T23:59:59.000Z

262

A Simplified Ice–Ocean Coupled Model for the Antarctic Ice Melt Season  

Science Conference Proceedings (OSTI)

In the Antarctic Ocean, sea ice melts mostly by warming of the ocean mixed layer through heat input (mainly solar radiation) in open water areas. A simplified ice–upper ocean coupled model is proposed in which sea ice melts only by the ocean heat ...

Kay I. Ohshima; Sohey Nihashi

2005-02-01T23:59:59.000Z

263

A Potential Role for Immersion Freezing in Arctic Mixed-Phase Stratus  

NLE Websites -- All DOE Office Websites (Extended Search)

Potential Role for Immersion Freezing in Arctic Mixed-Phase Stratus Potential Role for Immersion Freezing in Arctic Mixed-Phase Stratus Gijs de Boer, Edwin W. Eloranta, Tempei Hashino, and Gregory J. Tripoli The University of Wisconsin - Madison (1) Introduction Ice formation appears to a dominant factor controlling the lifecycle of Arctic mixed-phase clouds. To date, our understanding of ice formation in these long-lasting cloud structures does not explain the formation of observed ice amounts. Particularly puzzling are observa-

264

Hydrological and biogeochemical cycling along the Greenland ice sheet margin  

E-Print Network (OSTI)

Global warming has led to a significant increase in Greenland ice sheet (GrIS) melt and runoff since 1990, resulting in escalated export of fresh water and associated sediment to the surrounding North Atlantic and Arctic ...

Bhatia, Maya Pilar, 1979-

2012-01-01T23:59:59.000Z

265

A Thermodynamic Coupled Ice-Ocean Model of the Marginal Ice Zone  

Science Conference Proceedings (OSTI)

A coupled ice-ocean model for thermodynamic growth of sea ice suitable for coupling with a similar dynamic model is considered. The model is balanced locally in that no horizontal (or vertical) advection or diffusion of properties are considered. ...

Lars Petter Røed

1984-12-01T23:59:59.000Z

266

Automated Ice-Tethered Profilers for Seawater Observations under Pack Ice in All Seasons  

Science Conference Proceedings (OSTI)

An automated, easily deployed Ice-Tethered Profiler (ITP) instrument system, developed for deployment on perennial sea ice in the polar oceans to measure changes in upper ocean water properties in all seasons, is described, and representative ...

R. Krishfield; J. Toole; A. Proshutinsky; M-L. Timmermans

2008-11-01T23:59:59.000Z

267

Retrieval of Cloud Phase Using the Moderate Resolution Imaging Spectroradiometer Data during the Mixed-Phase Arctic Cloud Experiment  

SciTech Connect

Improving climate model predictions over Earth's polar regions requires a comprehensive knowledge of polar cloud microphysics. Over the Arctic, there is minimal contrast between the clouds and background snow surface, making it difficult to detect clouds and retrieve their phase from space. Snow and ice cover, temperature inversions, and the predominance of mixed-phase clouds make it even more difficult to determine cloud phase. Also, since determining cloud phase is the first step toward analyzing cloud optical depth, particle size, and water content, it is vital that the phase be correct in order to obtain accurate microphysical and bulk properties. Changes in these cloud properties will, in turn, affect the Arctic climate since clouds are expected to play a critical role in the sea ice albedo feedback. In this paper, the IR trispectral technique (IRTST) is used as a starting point for a WV and 11-{micro}m brightness temperature (T11) parameterization (WVT11P) of cloud phase using MODIS data. In addition to its ability to detect mixed-phase clouds, the WVT11P also has the capability to identify thin cirrus clouds overlying mixed or liquid phase clouds (multiphase ice). Results from the Atmospheric Radiation Measurement (ARM) MODIS phase model (AMPHM) are compared to the surface-based cloud phase retrievals over the ARM North Slope of Alaska (NSA) Barrow site and to in-situ data taken from University of North Dakota Citation (CIT) aircraft which flew during the Mixed-Phase Arctic Cloud Experiment (MPACE). It will be shown that the IRTST and WVT11P combined to form the AMPHM can achieve a relative high accuracy of phase discrimination compared to the surface-based retrievals. Since it only uses MODIS WV and IR channels, the AMPHM is robust in the sense that it can be applied to daytime, twilight, and nighttime scenes with no discontinuities in the output phase.

Spangenberg, D.; Minnis, P.; Shupe, M.; Uttal, T.; Poellot, M.

2005-03-18T23:59:59.000Z

268

Management in multispecies harvesting of the Barents Sea fisheries.  

E-Print Network (OSTI)

??In Barents Sea, there are especially three species of zooplankton preying fish which have been of great commercial value: the Northeast Arctic (NEA) cod (Gadus… (more)

Cai, Yuan Yuan

2007-01-01T23:59:59.000Z

269

An Observational Estimate of Volume and Freshwater Flux Leaving the Arctic Ocean through Nares Strait  

Science Conference Proceedings (OSTI)

The Arctic Ocean is an important link in the global hydrological cycle, storing freshwater and releasing it to the North Atlantic Ocean in a variable fashion as pack ice and freshened seawater. An unknown fraction of this return flow passes ...

Andreas Münchow; Humfrey Melling; Kelly K. Falkner

2006-11-01T23:59:59.000Z

270

Satellite Retrievals of Arctic and Equatorial Rain and Snowfall Rates Using Millimeter Wavelengths  

E-Print Network (OSTI)

A new global precipitation retrieval algorithm for the millimeter-wave Advanced Microwave Sounding Unit is presented that also retrieves Arctic precipitation rates over surface snow and ice. This algorithm improves upon ...

Surussavadee, Chinnawat

271

Surface Albedo over the Arctic Ocean Derived from AVHRR and Its Validation with SHEBA Data  

Science Conference Proceedings (OSTI)

A method is presented for retrieving the broadband albedo over the Arctic Ocean using advanced very high resolution radiometer (AVHRR) data obtained from NOAA polar-orbiting satellites. Visible and near-infrared albedos over snow and ice surfaces ...

Xiaozhen Xiong; Knut Stamnes; Dan Lubin

2002-04-01T23:59:59.000Z

272

Turbulence Structure of Arctic Stratus Clouds Derived from Measurements and Calculations  

Science Conference Proceedings (OSTI)

Results are presented from a detailed case study of an Arctic stratus cloud over the Fram Strait that is based on aircraft measurements and model calculations. The measurements have been performed during MIZEX 1984 (Marginal Ice Zone Experiment) ...

Jörg E. Finger; Peter Wendling

1990-06-01T23:59:59.000Z

273

Instrumentation to Measure the Depth/Time Fluctuations in Acoustic Pulses Propagated through Arctic Internal Waves  

Science Conference Proceedings (OSTI)

Instrumentation for measuring the evolution of volume-scattered acoustic signals in both depth and time is described. Measurements were taken for 12 days during the spring of 1985 with transmitters and receivers suspended beneath arctic pack ice ...

Terry E. Ewart; Stephen A. Reynolds

1990-02-01T23:59:59.000Z

274

Potential Impacts of the Arctic on Interannual and Interdecadal Summer Precipitation over China  

Science Conference Proceedings (OSTI)

After the end of the 1970s, there has been a tendency for enhanced summer precipitation over south China and the Yangtze River valley and drought over north China and northeastern China. Coincidentally, Arctic ice concentration has decreased since ...

Yuefeng Li; L. Ruby Leung

2013-02-01T23:59:59.000Z

275

TOWARDS A CHARACTERIZATION OF ARCTIC MIXED-PHASE CLOUDS CIRES/NOAA/ETL  

E-Print Network (OSTI)

, radar-based retrieval methods. On average, mixed-phase cloud ice particle mean diameters increase fromTOWARDS A CHARACTERIZATION OF ARCTIC MIXED-PHASE CLOUDS Shupe, M. CIRES/NOAA/ETL Kollias, P Laboratory P.O. Box, Upton, NY www.bnl.gov ABSTRACT Mixed-phase clouds play a unique role in the Arctic

276

Semidiurnal tides on the Laptev Sea shelf with implications for shear and vertical mixing  

Science Conference Proceedings (OSTI)

The Arctic continental shelf seas hold a globally significant source of freshwater that impacts Arctic Ocean stratification, circulation and climate. This freshwater can be injected below the surface mixed layer by intense turbulent kinetic energy ...

Markus A. Janout; Yueng-Djern Lenn

277

under a Creative Commons License. Climate of the Past Modelling the Early Weichselian Eurasian Ice Sheets: role of ice  

E-Print Network (OSTI)

Abstract. During the last glaciation, a marine ice sheet repeatedly appeared in Eurasia. The floating part of this ice sheet was essential to its rapid extension over the seas. During the earliest stage (90 kyr BP), large ice-dammed lakes formed south of the ice sheet. These lakes are believed to have cooled the climate at the margin of the ice. Using an ice sheet model, we investigated the role of ice shelves during the inception and the influence of ice-dammed lakes on the ice sheet evolution. Inception in Barents sea seems due to thickening of a large ice shelf. We observe a substantial impact of the lakes on the evolution of the ice sheets. Reduced summer ablation enhances ice extent and thickness, and the deglaciation is delayed by 2000 years. 1

V. Peyaud; C. Ritz; G. Krinner

2007-01-01T23:59:59.000Z

278

Global Simulations of Ice nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model  

Science Conference Proceedings (OSTI)

A process-based treatment of ice supersaturation and ice-nucleation is implemented in the National Center for Atmospheric Research (NCAR) Community Atmosphere Model (CAM). The new scheme is designed to allow (1) supersaturation with respect to ice, (2) ice nucleation by aerosol particles and (3) ice cloud cover consistent with ice microphysics. The scheme is implemented with a 4-class 2 moment microphysics code and is used to evaluate ice cloud nucleation mechanisms and supersaturation in CAM. The new model is able to reproduce field observations of ice mass and mixed phase cloud occurrence better than previous versions of the model. Simulations indicate heterogeneous freezing and contact nucleation on dust are both potentially important over remote areas of the Arctic. Cloud forcing and hence climate is sensitive to different formulations of the ice microphysics. Arctic radiative fluxes are sensitive to the parameterization of ice clouds. These results indicate that ice clouds are potentially an important part of understanding cloud forcing and potential cloud feedbacks, particularly in the Arctic.

Gettelman, A.; Liu, Xiaohong; Ghan, Steven J.; Morrison, H.; Park, Sungsu; Conley, Andrew; Klein, Stephen A.; Boyle, James; Mitchell, David; Li, J-L F.

2010-09-28T23:59:59.000Z

279

Mathematical Modelling and Numerical Simulation of Marine Ecosystems With Applications to Ice Algae.  

E-Print Network (OSTI)

??Sea-ice ecosystem modelling is a novel field of research. In this thesis, the main organism studied is sea-ice algae. A basic introduction to algae and… (more)

Wickramage, Shyamila Iroshi Perera

2013-01-01T23:59:59.000Z

280

The Importance of Ice Vertical Resolution for Snowball Climate and Deglaciation  

Science Conference Proceedings (OSTI)

Sea ice schemes with a few vertical levels are typically used to simulate the thermodynamic evolution of sea ice in global climate models. Here it is shown that these schemes overestimate the magnitude of the diurnal surface temperature cycle by ...

Dorian S. Abbot; Ian Eisenman; Raymond T. Pierrehumbert

2010-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

The Arctic Haze Phenomenon  

Science Conference Proceedings (OSTI)

The arctic atmosphere is the repository for surprisingly high concentrations of pollutants throughout the winter months. The polluted air mass in question includes virtually all the atmosphere above the Arctic Circle and also two great lobes that ...

Glenn E. Shaw

1995-12-01T23:59:59.000Z

282

Using Ice to Mimic Nacre: From Structural Materials to Artificial Bone  

E-Print Network (OSTI)

Using Ice to Mimic Nacre: From Structural Materials tohere how the physics of ice formation can be used to developphenomenon, the freezing of sea ice, which occurs at the

Deville, Sylvain; Saiz, Eduardo; Nalla, Ravi K.; Tomsia, Antoni P.

2005-01-01T23:59:59.000Z

283

Predictions and Studies with a One-Dimensional Ice–Ocean Model  

Science Conference Proceedings (OSTI)

A coupled one-dimensional ice-ocean model is used for studies of Arctic phenomena. The ice-snow system is represented by the simplified thermodynamic ice model of Semtner and a dynamic approximation that neglects the internal stresses. The ocean ...

Shelley H. Riedlinger; Alex Warn-Varnas

1990-10-01T23:59:59.000Z

284

Observations of Thermohaline Convection adjacent to Brunt Ice Shelf  

Science Conference Proceedings (OSTI)

Observations were made of ocean microstructure and horizontal currents adjacent to Brunt Ice Shelf in the southeastern Weddell Sea. Periods of in situ supercooled water extending as deep as 65 m were associated with ice nucleation and frazil ...

Ilker Fer; Keith Makinson; Keith W. Nicholls

2012-03-01T23:59:59.000Z

285

Wave-induced Roll Motion beneath an Ice Cover  

Science Conference Proceedings (OSTI)

A pair of gravity waves propagating at oblique angles along the sea-ice interface in a viscous, rotating ocean is studied theoretically. The motion is described by a Lagrangian formulation. Two theoretical models of the ice cover are considered. ...

Arne Melsom

1992-01-01T23:59:59.000Z

286

Simulations of Snow, Ice, and Near-Surface Atmospheric Processes on Ice Station Weddell  

Science Conference Proceedings (OSTI)

The 4-month drift of Ice Station Weddell (ISW) produced over 2000 h of nearly continuous measurements in the atmospheric surface layer and in the snow and sea ice in the western Weddell Sea. This paper reports simulations, based on these data, of ...

Edgar L. Andreas; Rachel E. Jordan; Aleksandr P. Makshtas

2004-08-01T23:59:59.000Z

287

2012 Changing Arctic Ocean 506E/497E -Lecture 1 -Woodgate What makes the  

E-Print Network (OSTI)

"? Decreasing Ice cover Local communities subsistence Arctic Shipping Routes? Oil/Gas Exploration Links INPUTS/OUTPUTS ­ E-P, rivers RIVERS (Russian and US) - order 3000 km3/yr freshwater Evaporation-Precipitation - order 2000 km3/yr freshwater Ice Export through the Fram Strait - equivalent to order 2000 km3/yr

Washington at Seattle, University of

288

Estimation of Thin Ice Thickness and Detection of Fast Ice from SSM/I Data in the Antarctic Ocean  

Science Conference Proceedings (OSTI)

Antarctic coastal polynyas are important areas of high sea ice production and dense water formation, and thus their detection including an estimate of thin ice thickness is essential. In this paper, the authors propose an algorithm that estimates ...

Takeshi Tamura; Kay I. Ohshima; Thorsten Markus; Donald J. Cavalieri; Sohey Nihashi; Naohiko Hirasawa

2007-10-01T23:59:59.000Z

289

A One-Dimensional Time-Dependent Model for the Vertical Stratification of the Upper Arctic Ocean  

Science Conference Proceedings (OSTI)

A one-dimensional time-dependent model of the upper Arctic Ocean is presented. It describes the circulation above a dynamically passive reservoir of Atlantic water. The model is driven by freshwater runoff from land, ice production and export, ...

Göran Björk

1989-01-01T23:59:59.000Z

290

Ion Partitioning at the liquid/vapor interface of a multi-component alkali halide solution: A model for aqueous sea salt aerosols  

E-Print Network (OSTI)

model for aqueous sea salt aerosols Sutapa Ghosal, 1 Matthewwith sea salt ice and aerosols has been implicated in theof aqueous sea salt aerosols and particles have been

Ghosal, Sutapa

2009-01-01T23:59:59.000Z

291

A Characterization of the Present-Day Arctic Atmosphere in CCSM4  

Science Conference Proceedings (OSTI)

Simulation of key features of the Arctic atmosphere in the Community Climate System Model, version 4 (CCSM4) is evaluated against observational and reanalysis datasets for the present-day (1981–2005). Surface air temperature, sea level pressure, ...

Gijs de Boer; William Chapman; Jennifer E. Kay; Brian Medeiros; Matthew D. Shupe; Steve Vavrus; John Walsh

2012-04-01T23:59:59.000Z

292

Observational and Theoretical Studies of Solar Radiation in Arctic Stratus Clouds  

Science Conference Proceedings (OSTI)

A series of clouds-radiation experiments was carried out in June 1980 in Arctic stratus clouds occurring over the Beaufort Sea using the NCAR Electra aircraft. This paper is an analysis of the hemispheric radiation fields obtained with Eppley ...

G. F. Herman; J. A. Curry

1984-01-01T23:59:59.000Z

293

A Potential Role for Immersion Freezing in Arctic Mixed-Phase Stratus Gijs de Boer,Edwin W.Eloranta,Tempei Hashino,and Gregory J.Tripoli  

E-Print Network (OSTI)

to a dominant factor controlling the lifecycle of Arctic mixed-phase clouds. To date, our understanding of ice Stratus from M-PACE Mixed-Phase Layer Ice Precipitation "Bursts" Time (UT) Altitude(km) Lidar backscatter. - Additionally, Shupe illustrated that ice water content and liquid water content seem to vary in phase with each

Eloranta, Edwin W.

294

Large-Scale Climate Controls of Interior Alaska River Ice Breakup  

Science Conference Proceedings (OSTI)

Frozen rivers in the Arctic serve as critical highways because of the lack of roads; therefore, it is important to understand the key mechanisms that control the timing of river ice breakup. The relationships between springtime Interior Alaska ...

Peter A. Bieniek; Uma S. Bhatt; Larry A. Rundquist; Scott D. Lindsey; Xiangdong Zhang; Richard L. Thoman

2011-01-01T23:59:59.000Z

295

Who Will Cry For the Ice? A Preliminary Sketch of Metaphorical Framing and Conceptual Understanding in Climate Change Terminology  

E-Print Network (OSTI)

Who Will Cry For the Ice?    A Preliminary Sketch of of life?   WHO WILL CRY FOR THE ICE?   While we discuss the world and the polar sea ice is melting, and  the permafrost 

Brooks, Carter

2005-01-01T23:59:59.000Z

296

Potential impacts of the Arctic on interannual and interdecadal summer precipitation over China  

SciTech Connect

After the end of the 1970s, there has been a tendency for enhanced summer precipitation over South China and the Yangtze River valley and drought over North China and Northeastern China. Coincidentally, Arctic ice concentration has decreased since the late 1970s, with larger reduction in summer than spring. However, the Arctic warming is more significant in spring than summer, suggesting that spring Arctic conditions could be more important in their remote impacts. This study investigates the potential impacts of the Arctic on summer precipitation in China. The leading spatial patterns and time coefficients of the unfiltered, interannual, and interdecadal precipitation (1960-2008) modes were analyzed and compared using empirical orthogonal function (EOF) analysis, which shows that the first three EOFs can capture the principal precipitation patterns (northern, central and southern patterns) over eastern China. Regression of the Arctic spring and summer temperature onto the time coefficients of the leading interannual and interdecadal precipitation modes shows that interdecadal summer precipitation in China is related to the Arctic spring warming, but the relationship with Arctic summer temperature is weak. Moreover, no notable relationships were found between the first three modes of interannual precipitation and Arctic spring or summer temperatures. Finally, correlations between summer precipitation and the Arctic Oscillation (AO) index from January to August were investigated, which indicate that summer precipitation in China correlates with AO only to some extent. Overall, this study suggests important relationships between the Arctic spring temperature and summer precipitation over China at the interdecadal time scale.

Li, Yuefeng; Leung, Lai-Yung R.

2013-02-01T23:59:59.000Z

297

NETL: Arctic Energy Office  

NLE Websites -- All DOE Office Websites (Extended Search)

The Arctic Energy Office image showing Alaska landscape Alaska North Slope Resources Alaska Unconventional Resources ChallengesShortages AEO Program Fact Sheet Alaskas fossil...

298

Parameterizing Size Distribution in Ice Clouds  

SciTech Connect

PARAMETERIZING SIZE DISTRIBUTIONS IN ICE CLOUDS David L. Mitchell and Daniel H. DeSlover ABSTRACT An outstanding problem that contributes considerable uncertainty to Global Climate Model (GCM) predictions of future climate is the characterization of ice particle sizes in cirrus clouds. Recent parameterizations of ice cloud effective diameter differ by a factor of three, which, for overcast conditions, often translate to changes in outgoing longwave radiation (OLR) of 55 W m-2 or more. Much of this uncertainty in cirrus particle sizes is related to the problem of ice particle shattering during in situ sampling of the ice particle size distribution (PSD). Ice particles often shatter into many smaller ice fragments upon collision with the rim of the probe inlet tube. These small ice artifacts are counted as real ice crystals, resulting in anomalously high concentrations of small ice crystals (D < 100 µm) and underestimates of the mean and effective size of the PSD. Half of the cirrus cloud optical depth calculated from these in situ measurements can be due to this shattering phenomenon. Another challenge is the determination of ice and liquid water amounts in mixed phase clouds. Mixed phase clouds in the Arctic contain mostly liquid water, and the presence of ice is important for determining their lifecycle. Colder high clouds between -20 and -36 oC may also be mixed phase but in this case their condensate is mostly ice with low levels of liquid water. Rather than affecting their lifecycle, the presence of liquid dramatically affects the cloud optical properties, which affects cloud-climate feedback processes in GCMs. This project has made advancements in solving both of these problems. Regarding the first problem, PSD in ice clouds are uncertain due to the inability to reliably measure the concentrations of the smallest crystals (D < 100 µm), known as the “small mode”. Rather than using in situ probe measurements aboard aircraft, we employed a treatment of ice cloud optical properties formulated in terms of PSD parameters in combination with remote measurements of thermal radiances to characterize the small mode. This is possible since the absorption efficiency (Qabs) of small mode crystals is larger at 12 µm wavelength relative to 11 µm wavelength due to the process of wave resonance or photon tunneling more active at 12 µm. This makes the 12/11 µm absorption optical depth ratio (or equivalently the 12/11 µm Qabs ratio) a means for detecting the relative concentration of small ice particles in cirrus. Using this principle, this project tested and developed PSD schemes that can help characterize cirrus clouds at each of the three ARM sites: SGP, NSA and TWP. This was the main effort of this project. These PSD schemes and ice sedimentation velocities predicted from them have been used to test the new cirrus microphysics parameterization in the GCM known as the Community Climate Systems Model (CCSM) as part of an ongoing collaboration with NCAR. Regarding the second problem, we developed and did preliminary testing on a passive thermal method for retrieving the total water path (TWP) of Arctic mixed phase clouds where TWPs are often in the range of 20 to 130 g m-2 (difficult for microwave radiometers to accurately measure). We also developed a new radar method for retrieving the cloud ice water content (IWC), which can be vertically integrated to yield the ice water path (IWP). These techniques were combined to determine the IWP and liquid water path (LWP) in Arctic clouds, and hence the fraction of ice and liquid water. We have tested this approach using a case study from the ARM field campaign called M-PACE (Mixed-Phase Arctic Cloud Experiment). This research led to a new satellite remote sensing method that appears promising for detecting low levels of liquid water in high clouds typically between -20 and -36 oC. We hope to develop this method in future research.

DeSlover, Daniel; Mitchell, David L.

2009-09-25T23:59:59.000Z

299

Is There a Dominant Timescale of Natural Climate Variability in the Arctic?  

Science Conference Proceedings (OSTI)

A frequency-domain singular value decomposition performed jointly on century-long (1903–94) records of North Atlantic sector sea ice concentration and sea level pressure poleward of 40°N reveals that fluctuations on the interdecadal and quasi-...

Silvia A. Venegas; Lawrence A. Mysak

2000-10-01T23:59:59.000Z

300

A Comparison of Different Sea Level Pressure Analysis Fields in the East Greenland Sea  

Science Conference Proceedings (OSTI)

Geostrophic wind fields, used to drive a numerical sea ice model, were calculated from three sources of sea-level pressure. The pressures obtained from the National Weather Service's operational analysis system, which are also included as part of ...

W. B. Tucker III

1983-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

The 1990 Valentine's Day Arctic Outbreak. Part I: Mesoscale and Microscale Structure and Evolution of a Colorado Front Range Shallow Upslope Cloud  

Science Conference Proceedings (OSTI)

The mesoscale and microscale structure and evolution of a shallow, upslope cloud is described using observations obtained during the Winter Icing and Storms Project (WISP) and model stimulations. The upslope cloud formed within a shallow arctic ...

Roy M. Rasmussen; Ben C. Bernstein; Masataka Murakami; Greg Stossmeister; Jon Reisner; Boba Stankov

1995-07-01T23:59:59.000Z

302

Evolution of the Arctic Ocean Salinity, 2007–08: Contrast between the Canadian and the Eurasian Basins  

Science Conference Proceedings (OSTI)

The authors investigate the variability of salinity in the Arctic Ocean and in the Nordic and Labrador Seas over recent years to see how the freshwater balance in the Arctic and the exchanges with the North Atlantic have been affected by the ...

Camille Lique; Gilles Garric; Anne-Marie Treguier; Bernard Barnier; Nicolas Ferry; Charles-Emmanuel Testut; Fanny Girard-Ardhuin

2011-03-01T23:59:59.000Z

303

Projected Impact of Climate Change on the Energy Budget of the Arctic Ocean by a Global Climate Model  

Science Conference Proceedings (OSTI)

The annual energy budget of the Arctic Ocean is characterized by a net heat loss at the air–sea interface that is balanced by oceanic heat transport into the Arctic. Two 150-yr simulations (1950–2099) of a global climate model are used to examine ...

James R. Miller; Gary L. Russell

2002-11-01T23:59:59.000Z

304

Formation and Maintenance of a Polynya in the Weddell Sea  

Science Conference Proceedings (OSTI)

A dynamic–thermodynamic sea ice–mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice–atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the ...

Ralph Timmermann; Peter Lemke; Christoph Kottmeier

1999-06-01T23:59:59.000Z

305

Snowmelt on the Greenland Ice Sheet as Derived from Passive Microwave Satellite Data  

Science Conference Proceedings (OSTI)

The melt extent of the snow on the Greenland ice sheet is of considerable importance to the ice sheet’s mass and energy balance, as well as Arctic and global climates. By comparing passive microwave satellite data to field observations, ...

Waleed Abdalati; Konrad Steffen

1997-02-01T23:59:59.000Z

306

Sidescan Sonar Imagery of the Winter Marginal Ice Zone Obtained from an AUV  

Science Conference Proceedings (OSTI)

The first Arctic under-ice sidescan sonar imagery from an autonomous underwater vehicle (AUV) has been obtained in the winter marginal ice zone of the East Greenland Current at 73°00?N, 11°47?W, using a Maridan Martin 150 vehicle operated from R/...

P. Wadhams; J. P. Wilkinson; A. Kaletzky

2004-09-01T23:59:59.000Z

307

Sensitivity of the Arctic Climate to Leads in a Coupled Atmosphere-Mixed Layer Ocean Model  

Science Conference Proceedings (OSTI)

The thermodynamic sea ice code in a coupled atmosphere-mixed layer ocean GCM has been altered to allow the presence of open water within an ice pack (leads) and a prescribed turbulent oceanic heat flux at the ice bottom. Two experiments with the ...

Stephen J. Vavrus

1995-02-01T23:59:59.000Z

308

Precipitation Features Observed by Doppler Radar at Tuktoyaktuk, Northwest Territories, Canada, during the Beaufort and Arctic Storms Experiment  

Science Conference Proceedings (OSTI)

In the fall of 1994, the Beaufort and Arctic Storms Experiment (BASE) was held to collect information on the structure and evolution of mesoscale weather systems over the southern Beaufort Sea and the Mackenzie River delta of the western Canadian ...

Yoshio Asuma; Soshi Iwata; Katsuhiro Kikuchi; G. W. Kent Moore; Ryuji Kimura; Kazuhisa Tsuboki

1998-09-01T23:59:59.000Z

309

Testing a Coupled Ice-Mixed-Layer Model Under Subarctic Conditions  

Science Conference Proceedings (OSTI)

A one-dimensional oceanic mixed-layer model has been coupled with a thermodynamic sea ice model in order to study the seasonal cycle of ice-ocean interaction in the subarctic ocean. The ice thickness is assumed constant and only variations of ice ...

Marie-Noëlle Houssais

1988-02-01T23:59:59.000Z

310

Climate-derived tensions in Arctic security.  

Science Conference Proceedings (OSTI)

Globally, there is no lack of security threats. Many of them demand priority engagement and there can never be adequate resources to address all threats. In this context, climate is just another aspect of global security and the Arctic just another region. In light of physical and budgetary constraints, new security needs must be integrated and prioritized with existing ones. This discussion approaches the security impacts of climate from that perspective, starting with the broad security picture and establishing how climate may affect it. This method provides a different view from one that starts with climate and projects it, in isolation, as the source of a hypothetical security burden. That said, the Arctic does appear to present high-priority security challenges. Uncertainty in the timing of an ice-free Arctic affects how quickly it will become a security priority. Uncertainty in the emergent extreme and variable weather conditions will determine the difficulty (cost) of maintaining adequate security (order) in the area. The resolution of sovereignty boundaries affects the ability to enforce security measures, and the U.S. will most probably need a military presence to back-up negotiated sovereignty agreements. Without additional global warming, technology already allows the Arctic to become a strategic link in the global supply chain, possibly with northern Russia as its main hub. Additionally, the multinational corporations reaping the economic bounty may affect security tensions more than nation-states themselves. Countries will depend ever more heavily on the global supply chains. China has particular needs to protect its trade flows. In matters of security, nation-state and multinational-corporate interests will become heavily intertwined.

Backus, George A.; Strickland, James Hassler

2008-09-01T23:59:59.000Z

311

Heat and Freshwater Fluxes through the Nordic Seas  

Science Conference Proceedings (OSTI)

The major exchanges of volume, heat, and freshwater between the Arctic Ocean and the World Ocean occur through the Nordic seas. Here is presented the northernmost estimate for the oceanic transport of these properties that is derived from a set ...

Kevin I. C. Oliver; Karen J. Heywood

2003-05-01T23:59:59.000Z

312

Arctic Solar | Open Energy Information  

Open Energy Info (EERE)

search Name Arctic Solar Place G"LLIVARE, Sweden Zip SE- 98228 Product manufacturers of PV modules References Arctic Solar1 LinkedIn Connections CrunchBase Profile No...

313

An update on land-ice modeling in the CESM  

Science Conference Proceedings (OSTI)

Mass loss from land ice, including the Greenland and Antarctic ice sheets as well as smaller glacier and ice caps, is making a large and growing contribution to global sea-level rise. Land ice is only beginning to be incorporated in climate models. The goal of the Land Ice Working Group (LIWG) is to develop improved land-ice models and incorporate them in CESM, in order to provide useful, physically-based sea-level predictions. LJWG efforts to date have led to the inclusion of a dynamic ice-sheet model (the Glimmer Community Ice Sheet Model, or Glimmer-CISM) in the Community Earth System Model (CESM), which was released in June 2010. CESM also includes a new surface-mass-balance scheme for ice sheets in the Community Land Model. Initial modeling efforts are focused on the Greenland ice sheet. Preliminary results are promising. In particular, the simulated surface mass balance for Greenland is in good agreement with observations and regional model results. The current model, however, has significant limitations: The land-ice coupling is one-way; we are using a serial version of Glimmer-CISM with the shallow-ice approximation; and there is no ice-ocean coupling. During the next year we plan to implement two-way coupling (including ice-ocean coupling with a dynamic Antarctic ice sheet) with a parallel , higher-order version of Glimmer-CISM. We will also add parameterizations of small glaciers and ice caps. With these model improvements, CESM will be able to simulate all the major contributors to 21st century global sea-level rise. Results of the first round of simulations should be available in time to be included in the Fifth Assessment Report (ARS) of the Intergovernmental Panel on Climate Change.

Lipscomb, William H [Los Alamos National Laboratory

2011-01-18T23:59:59.000Z

314

Hydrogen ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Chevrolet Silverado 1500HD Hydrogen ICE 1 Conversion Vehicle Specifications Engine: 6.0 L V8 Fuel Capacity: 10.5 GGE Nominal Tank Pressure: 5,000 psi Seatbelt Positions: Five...

315

Climate Variability in the Amundsen and Bellingshausen Seas  

Science Conference Proceedings (OSTI)

Satellite data reveal a 20% decline in sea ice extent in the Amundsen and Bellingshausen Seas in the two decades following 1973. This change is negatively correlated with surface air temperatures on the west side of the Antarctic Peninsula, which ...

Stanley S. Jacobs; Josefino C. Comiso

1997-04-01T23:59:59.000Z

316

Comparison of Arctic Climate Simulations by Uncoupled and Coupled Global Models  

Science Conference Proceedings (OSTI)

Simulations of present-day Arctic climate are assessed from suites of 1) 13 global atmosphere-only models from the Atmospheric Model Intercomparison Project (AMIP-II) and 2) 8 coupled atmosphere–ocean–ice models from the Data Distribution Center ...

John E. Walsh; Vladimir M. Kattsov; William L. Chapman; Veronika Govorkova; Tatyana Pavlova

2002-06-01T23:59:59.000Z

317

Black carbon in Arctic snow and its effect on surface albedo  

E-Print Network (OSTI)

1 Black carbon in Arctic snow and its effect on surface albedo Stephen Warren, University wavelengths: ice is nearly transparent. Absorptive impurities: Black carbon (soot) Brown carbon (organics broadband albedo: 83% 71% (2) by addition of black carbon (BC) (20 ppb): 0.5% for r = 100 µm 1.6% for r

318

Winter convection transports Atlantic Water heat to the surface layer in the eastern Arctic Ocean.  

Science Conference Proceedings (OSTI)

A one year (2009–2010) record of temperature and salinity profiles from Ice Tethered Profiler (ITP) buoys in the Eurasian Basin (EB) of the Arctic Ocean is used to quantify the flux of heat from the upper pycnocline to the surface mixed layer. The ...

Igor V. Polyakov; Andrey V. Pnyushkov; Robert Rember; Laurie Padman; Eddy C. Carmack; Jennifer M. Jackson

319

Winter Convection Transports Atlantic Water Heat to the Surface Layer in the Eastern Arctic Ocean  

Science Conference Proceedings (OSTI)

A 1-yr (2009/10) record of temperature and salinity profiles from Ice-Tethered Profiler (ITP) buoys in the Eurasian Basin (EB) of the Arctic Ocean is used to quantify the flux of heat from the upper pycnocline to the surface mixed layer. The upper ...

Igor V. Polyakov; Andrey V. Pnyushkov; Robert Rember; Laurie Padman; Eddy C. Carmack; Jennifer M. Jackson

2013-10-01T23:59:59.000Z

320

CONTENTS Developing Alaskan Arctic  

NLE Websites -- All DOE Office Websites (Extended Search)

Developing Alaskan Arctic Developing Alaskan Arctic Potential ...........................................1 Commentary ...................................2 NETL Develops Strategic Partnership with the Alaska Center for Energy and Power ...8 Deepwater and Ultra-Deepwater Produced Water Discharge ....10 Intelligent Production System for Ultra Deepwater with Short Hop Wireless Power and Wireless Data Transfer .........................................16 Snapshots ......................................19 CONTACTS Roy Long Technology Manager Ultra-Deepwater/Offshore 304-285-4479 roy.long@netl.doe.gov Ray Boswell Technology Manager Natural Gas Technology R&D 412-386-7614 ray.boswell@netl.doe.gov Eric Smistad Technology Manager Oil Technology R&D 281-494-2619 eric.smistad@netl.doe.gov

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Comparison of Airborne In Situ, Airborne Radar–Lidar, and Spaceborne Radar–Lidar Retrievals of Polar Ice Cloud Properties Sampled during the POLARCAT Campaign  

Science Conference Proceedings (OSTI)

This study illustrates the high potential of RALI, the French airborne radar–lidar instrument, for studying cloud processes and evaluating satellite products when satellite overpasses are available. For an Arctic nimbostratus ice cloud collected ...

Julien Delanoë; Alain Protat; Olivier Jourdan; Jacques Pelon; Mathieu Papazzoni; Régis Dupuy; Jean-Francois Gayet; Caroline Jouan

2013-01-01T23:59:59.000Z

322

Laboratory Measurements of the Drag Force on a Family of Two-Dimensional Ice Keel Models in a Two-Layer Flow  

Science Conference Proceedings (OSTI)

A review of the upper structure of the Arctic Ocean and its overlying ice cover suggests that significant potential exists for the generation of internal wave fields by the deeper drafts of the pressure ridge keels. Laboratory measurements are ...

H. D. Pite; D. R. Topham; B. J. van Hardenberg

1995-12-01T23:59:59.000Z

323

Ice Fishing  

NLE Websites -- All DOE Office Websites (Extended Search)

Ice Fishing Ice Fishing Nature Bulletin No. 327-A January 11, 1969 Forest Preserve District of Cook County Richard B. Ogilvie, President Roland F. Eisenbeis, Supt. of Conservation ICE FISHING We have a peculiar class of people known as the "Frosty-toed Tribe". As soon as winter comes and the ice permits, they put on all the clothes they own and what they can borrow, pack their automobiles with equipment, and start early in the morning for some inland body of water or a bay along one of the Great Lakes. Usually, two or three go together and they may drive 50 or 100 miles. For hours, even in below zero weather, they huddle around holes cut in the ice, fishing patiently, sustained by hope, hot coffee, and a lot of conversation. Some days a man may catch nothing. Other days he may bring home all the law allows. Sometimes he fishes vainly until almost sundown and then begins to haul them in, all of the same kind and size, as fast as he can re-bait his hook. In the meantime, other anglers have rushed over, cut holes, and are fishing all around him -- usually in vain, because one of the strange things about ice fishing is that, although you may catch fish out of one hole, you may get nothing out of another only a few feet from it, using the same kind of bait at the same depth. There are a lot of hotly contested theories but nobody knows why. After watching and questioning scores of ice fishermen, some of them noted for their prowess, we find that although each has his own secret techniques and favorite spots, good catches seem more a matter of luck than skill. Although they are sluggish and don't fight, fish caught in winter have the firmest flesh and finest flavor. The biggest thrill comes from the skillet.

324

Ross Ice Shelf in situ radio-frequency ice attenuation  

E-Print Network (OSTI)

We have measured the in situ average electric field attenuation length for radio-frequency signals broadcast vertically through the Ross Ice Shelf. We chose a location, Moore Embayment, south of Minna Bluff, known for its high reflectivity at the ice-sea interface. We confirmed specular reflection and used the return pulses to measure the average attenuation length from 75-1250 MHz over the round-trip distance of 1155 m. We find the average electric field attenuation length to vary from 500 m at 75 MHz to 300 m at 1250 MHz, with an experimental uncertainty of 55 to 15 m. We discuss the implications for neutrino telescopes that use the radio technique and include the Ross Ice Shelf as part of their sensitive volume.

Taylor Barrella; Steven Barwick; David Saltzberg

2010-11-02T23:59:59.000Z

325

Field, laboratory, and modeling studies of water infiltration and runoff in subfreezing snow on regional scales to estimate future greenhouse-induced changes in sea-level. Final report  

SciTech Connect

The current DOE-supported research program (Reduce Uncertainty in Future Sea-Level Change Due to Ice Wastage) addressed the question of how the refreezing of meltwater in cold snow affects sea-level changes in a future changing climate. The continuation of that research, proposed here, takes an additional new approach by focusing on processes which can be defined and characterized by measurements on regional scales. This new emphasis is intended to be directly applicable to a large-scale analysis from which runoff forecasts (and consequent sea level change) from the entire arctic region can be made. The research proposed here addresses the problem of forecasting future sea-level change due to greenhouse-induced changes in runoff from polar glaciers and ice caps. The objectives of this work are (1) to observe in the field the processes of infiltration and refreezing which lead to the formation of impermeable firn layers; (2) to reproduce these observed processes in the laboratory to confirm and further quantify their understanding; (3) to develop and calibrate a regional scale numerical model which can simulate these processes, based on measured parameters and driven by boundary conditions determined by climate; and (4) to apply this model to predict the development of impermeable firn (and consequent runoff and discharge to the ocean) in response to predicted future climate change.

1994-12-31T23:59:59.000Z

326

Long-Range Prediction of the Shipping Season in Hudson Bay: A Statistical Approach  

Science Conference Proceedings (OSTI)

Despite recent reductions in Arctic sea ice extent and the associated increase in both the recreational and commercial use of ice-infested waters, long-range prediction of operationally relevant sea ice parameters is an area of seasonal ...

Adrienne Tivy; Bea Alt; Stephen Howell; Katherine Wilson; John Yackel

2007-10-01T23:59:59.000Z

327

Climate Sensitivity to Continental Ice Sheet Size and Configuration  

Science Conference Proceedings (OSTI)

A version of the NCAR Community Climate Model (CCM) has been used to carry out a study of climate sensitivity to the size and distribution of continental ice sheets by comparing two perpetual season, fixed sea surface temperature (SST), winter ...

Richard A. Shinn; Eric J. Barron

1989-12-01T23:59:59.000Z

328

Meltwater effects on flow of Greenland's ice sheet less severe...  

NLE Websites -- All DOE Office Websites (Extended Search)

of increasing meltwater less severe than feared Meltwater effects on flow of Greenland's ice sheet less severe for sea level rise than earlier feared, scientists say The team found...

329

Why sequence arctic algae for alternative energy?  

NLE Websites -- All DOE Office Websites (Extended Search)

arctic algae for alternative energy? Five different protists representing different algal classes isolated from the Arctic Ocean are being investigated for adaptation to perennial...

330

Using Doppler spectra to separate hydrometeor populations and analyze ice precipitation in multilayered mixed-phase clouds  

SciTech Connect

Multimodality of cloud radar Doppler spectra is used to partition cloud particle phases and to separate distinct ice populations in the radar sample volume, thereby facilitating analysis of individual ice showers in multilayered mixed-phase clouds. A 35-GHz cloud radar located at Barrow, Alaska, during the Mixed-Phase Arctic Cloud Experiment collected the Doppler spectra. Data from a pair of collocated depolarization lidars confirmed the presence of two liquid cloud layers reported in this study. Surprisingly, both of these cloud layers were embedded in ice precipitation yet maintained their liquid. Our spectral separation of the ice precipitation yielded two distinct ice populations: ice initiated within the two liquid cloud layers and ice precipitation formed in higher cloud layers. Comparisons of ice fall velocity versus radar reflectivity relationships derived for distinct showers reveal that a single relationship might not properly represent the ice showers during this period.

Rambukkange, Mahlon P.; Verlinde, J.; Eloranta, E. W.; Flynn, Connor J.; Clothiaux, Eugene E.

2011-01-31T23:59:59.000Z

331

Underwater robotic work systems for Russian arctic offshore oil/gas industry: Final report. Export trade information  

SciTech Connect

The study was performed in association with Rosshelf, a shelf developing company located in Moscow. This volume involves developing an underwater robotic work system for oil exploration in Russia`s Arctic waters, Sea of Okhotsk and the Caspian Sea. The contents include: (1) Executive Summary; (2) Study Background; (3) Study Outline and Results; (4) Conclusions; (5) Separately Published Elements; (6) List of Subcontractors.

NONE

1997-12-15T23:59:59.000Z

332

1 FEBRUARY 2004 603V A V R U S 2004 American Meteorological Society  

E-Print Network (OSTI)

to the parameterized treatment of mixed-phase microphysics. Simulated modern Arctic cloud fraction is insensitive to model biases in surface boundary conditions (SSTs and sea ice distribution), but the modeled Arctic impact on sea ice growth and the melting of snow and ice in Arctic regions (Maykut and Unter- steiner

Wisconsin at Madison, University of

333

Arctic Energy Technology Development Laboratory  

DOE Green Energy (OSTI)

The Arctic Energy Technology Development Laboratory was created by the University of Alaska Fairbanks in response to a congressionally mandated funding opportunity through the U.S. Department of Energy (DOE), specifically to encourage research partnerships between the university, the Alaskan energy industry, and the DOE. The enabling legislation permitted research in a broad variety of topics particularly of interest to Alaska, including providing more efficient and economical electrical power generation in rural villages, as well as research in coal, oil, and gas. The contract was managed as a cooperative research agreement, with active project monitoring and management from the DOE. In the eight years of this partnership, approximately 30 projects were funded and completed. These projects, which were selected using an industry panel of Alaskan energy industry engineers and managers, cover a wide range of topics, such as diesel engine efficiency, fuel cells, coal combustion, methane gas hydrates, heavy oil recovery, and water issues associated with ice road construction in the oil fields of the North Slope. Each project was managed as a separate DOE contract, and the final technical report for each completed project is included with this final report. The intent of this process was to address the energy research needs of Alaska and to develop research capability at the university. As such, the intent from the beginning of this process was to encourage development of partnerships and skills that would permit a transition to direct competitive funding opportunities managed from funding sources. This project has succeeded at both the individual project level and at the institutional development level, as many of the researchers at the university are currently submitting proposals to funding agencies, with some success.

Sukumar Bandopadhyay; Charles Chamberlin; Robert Chaney; Gang Chen; Godwin Chukwu; James Clough; Steve Colt; Anthony Covescek; Robert Crosby; Abhijit Dandekar; Paul Decker; Brandon Galloway; Rajive Ganguli; Catherine Hanks; Rich Haut; Kristie Hilton; Larry Hinzman; Gwen Holdman; Kristie Holland; Robert Hunter; Ron Johnson; Thomas Johnson; Doug Kame; Mikhail Kaneveskly; Tristan Kenny; Santanu Khataniar; Abhijeet Kulkami; Peter Lehman; Mary Beth Leigh; Jenn-Tai Liang; Michael Lilly; Chuen-Sen Lin; Paul Martin; Pete McGrail; Dan Miller; Debasmita Misra; Nagendra Nagabhushana; David Ogbe; Amanda Osborne; Antoinette Owen; Sharish Patil; Rocky Reifenstuhl; Doug Reynolds; Eric Robertson; Todd Schaef; Jack Schmid; Yuri Shur; Arion Tussing; Jack Walker; Katey Walter; Shannon Watson; Daniel White; Gregory White; Mark White; Richard Wies; Tom Williams; Dennis Witmer; Craig Wollard; Tao Zhu

2008-12-31T23:59:59.000Z

334

Plant roots in arctic tundra  

DOE Data Explorer (OSTI)

A synthesis of the available literature on tundra root distribution and dynamics, and their role in key ecosystem processes in the Arctic.

Colleen Iversen, Victoria Sloan, Paddy Sullivan, Eugenie Euskirchen, Dave McGuire, Richard Norby, Anthony Walker, Jeff Warren, Stan Wullschleger,

335

NETL: Arctic Energy Office  

NLE Websites -- All DOE Office Websites (Extended Search)

Facts/Issues Facts/Issues Average South-Central natural gas consumption in 2005 was: 13.9% gas utility 20.0% power generation 54.3% industrial-LNG sales, oil refining, and fertilizer manufacturing 7.2% field operations 4.6% other Due to a lack of natural gas deliverability, the Cook Inlet fertilizer plant terminated operations in May 2008. LNG sales are increasingly curtailed during cold weather due to peak demand shortages. The LNG export license is up for renewal in 2011. Exploration must find new reserves on the order of 500 Bcf, and that will only solve the natural gas shortage until approximately 2019. Challenges Natural gas in the Arctic, until recently, has been largely overlooked. Little is known about the possible breadth of the Arctic storehouse of natural gas apart from the resource associated with the currently producing

336

Ice Storm Database and Ice Severity Maps  

Science Conference Proceedings (OSTI)

Historical icing information has several valuable uses in overhead transmission line ice loading design and research. Previously, this type of information was neither readily available nor easily acquired. This report describes the creation of an electronic ice storm database and regional ice severity maps for the United States.

1996-12-17T23:59:59.000Z

337

Arctic Energy Office  

NLE Websites -- All DOE Office Websites (Extended Search)

O O G R A M FAC T S Strategic Center for Natural Gas & Oil CONTACTS Joel Lindstrom Arctic Energy Office National Energy Technology Laboratory 420 L Street, Suite 305 Anchorage, Alaska 99501 907-271-3618 joel.lindstrom@contr.netl.doe.gov Albert B. Yost II Sr. Management Technical Advisor Strategic Center for Natural Gas & Oil National Energy Technology Laboratory 3610 Collins Ferry Road Morgantown, WV 26507-0880 304-285-4479 albert.yost@netl.doe.gov

338

U.S. Geological Survery Oil and Gas Resource Assessment of the Russian Arctic  

SciTech Connect

The U.S. Geological Survey (USGS) recently completed a study of undiscovered petroleum resources in the Russian Arctic as a part of its Circum-Arctic Resource Appraisal (CARA), which comprised three broad areas of work: geological mapping, basin analysis, and quantitative assessment. The CARA was a probabilistic, geologically based study that used existing USGS methodology, modified somewhat for the circumstances of the Arctic. New map compilation was used to identify assessment units. The CARA relied heavily on geological analysis and analog modeling, with numerical input consisting of lognormal distributions of sizes and numbers of undiscovered accumulations. Probabilistic results for individual assessment units were statistically aggregated, taking geological dependencies into account. The U.S. Department of Energy (DOE) funds were used to support the purchase of crucial seismic data collected in the Barents Sea, East Siberian Sea, and Chukchi Sea for use by USGS in its assessment of the Russian Arctic. DOE funds were also used to purchase a commercial study, which interpreted seismic data from the northern Kara Sea, and for geographic information system (GIS) support of USGS mapping of geological features, province boundaries, total petroleum systems, and assessment units used in the USGS assessment.

Donald Gautier; Timothy Klett

2008-12-31T23:59:59.000Z

339

Validation of ECMWF Sea Level Pressure Analyses over the Bellingshausen Sea, Antarctica  

Science Conference Proceedings (OSTI)

Surface pressure measurements from instruments deployed on ice floes in the southern Bellingshausen Sea were used to assess the accuracy of European Centre for Medium-Range Weather Forecasts (ECMWF) analyses in this region during February–May ...

J. C. King

2003-06-01T23:59:59.000Z

340

Glossary Term - Dry Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

Deuteron Previous Term (Deuteron) Glossary Main Index Next Term (Electron) Electron Dry Ice A block of dry ice sublimating on a table. Dry ice is the solid form of carbon dioxide...

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Smoothed particle hydrodynamics Non-Newtonian model for ice-sheet and ice-shelf dynamics  

SciTech Connect

Mathematical modeling of ice sheets is complicated by the non-linearity of the governing equations and boundary conditions. Standard grid-based methods require complex front tracking techniques and have limited capability to handle large material deformations and abrupt changes in bottom topography. As a consequence, numerical methods are usually restricted to shallow ice sheet and ice shelf approximations. We propose a new smoothed particle hydrodynamics (SPH) non-Newtonian model for coupled ice sheet and ice shelf dynamics. SPH, a fully Lagrangian particle method, is highly scalable and its Lagrangian nature and meshless discretization are well suited to the simulation of free surface ?ows, large material deformation, and material fragmentation. In this paper, SPH is used to study 3D ice sheet/ice shelf behavior, and the dynamics of the grounding line. The steady state position of the grounding line obtained from SPH simulations is in good agreement with laboratory observations for a wide range of simulated bedrock slopes, and density ratios, similar to those of ice and sea water. The numerical accuracy of the SPH algorithm is veri?ed by simulating Poiseuille ?ow, plane shear ?ow with free surface and the propagation of a blob of ice along a horizontal surface. In the laboratory experiment, the ice was represented with a viscous Newtonian ?uid. In the present work, however, the ice is modeled as both viscous Newtonian ?uid and non-Newtonian ?uid, such that the e?ect of non-Newtonian rheology on the dynamics of grounding line was examined. The non-Newtonian constitutive relation is prescribed to be Glen’s law for the creep of polycrystalline ice. A V-shaped bedrock ramp is further introduced to model the real geometry of bedrock slope.

Pan, Wenxiao; Tartakovsky, Alexandre M.; Monaghan, Joseph J.

2013-06-01T23:59:59.000Z

342

A Smoothed Particle Hydrodynamics Model for Ice Sheet and Ice Shelf Dynamics  

SciTech Connect

Mathematical modeling of ice sheets is complicated by the non-linearity of the governing equations and boundary conditions. Standard grid-based methods require complex front tracking techniques and have limited capability to handle large material deformations and abrupt changes in bottom topography. As a consequence, numerical methods are usually restricted to shallow ice sheet and ice shelf approximations. We propose a new smoothed particle hydrodynamics (SPH) model for coupled ice sheet and ice shelf dynamics. SPH is a fully Lagrangian particle method. It is highly scalable and its Lagrangian nature and meshless discretization are well suited to the simulation of free surface flows, large material deformation, and material fragmentation. In this paper SPH is used to study ice sheet/ice shelf behavior, and the dynamics of the grounding line. The steady state position of the grounding line obtained from the SPH simulations is in good agreement with laboratory observations for a wide range of simulated bedrock slopes, and density ratios similar to those of ice and sea water. The numerical accuracy of the SPH algorithm is further verified by simulating the plane shear flow of two immiscible fluids and the propagation of a highly viscous blob of fluid along a horizontal surface. In the experiment, the ice was represented with a viscous newtonian fluid. For consistency, in the described SPH model the ice is also modeled as a viscous newtonian fluid. Typically, ice sheets are modeled as a non-Newtonian fluid, accounting for the changes in the mechanical properties of ice. Implementation of a non-Newtonian rheology in the SPH model is the subject of our ongoing research.

Pan, Wenxiao; Tartakovsky, Alexandre M.; Monaghan, Joseph J.

2012-02-08T23:59:59.000Z

343

Ocean Heat Flux in the Central Weddell Sea during Winter  

Science Conference Proceedings (OSTI)

Seasonal sea ice, which plays a pivotal role in air–sea interaction in the Weddell Sea (a region of large deep-water formation with potential impact on climate), depends critically on heat flux from the deep ocean. During the austral winter of ...

Miles G. McPhee; Christoph Kottmeier; James H. Morison

1999-06-01T23:59:59.000Z

344

Vertical Variations of Tidal Currents in Shallow Land Fast Ice-Covered Regions  

Science Conference Proceedings (OSTI)

Arctic tidal currents with periods near the local inertial period are strongest and rotate clockwise at mid-depth, and decrease in amplitude towards the bottom and ice-cover, experiencing a change in direction of rotation of the current vector to ...

S. J. Prinsenberg; E. B. Bennett

1989-09-01T23:59:59.000Z

345

Ice Engineering U.S. Army Engineer Research and Development Center, Hanover, New Hampshire  

E-Print Network (OSTI)

for crude oil grows, supplies in easy-to-access areas of the world are dwindling. Exploration, development to facilitate leak detection and improve spill response capabilities for oil and gas operations in Arctic/CRREL Technical Note 06-2 July 2006 Improving Oil Spill Response in Ice-Covered Waters As the world's appetite

346

Springtime Visibility in the Arctic  

Science Conference Proceedings (OSTI)

Since the Ptarmigan flights in the 1950s, the springtime visibility reduction in the Arctic has been identified with pollution aerosol. However, observed values of the dry aerosol extinction coefficient are too small to explain the observed ...

F. G. Meyer; J. A. Curry; C. A. Brock; L. F. Radke

1991-03-01T23:59:59.000Z

347

Synoptically Driven Arctic Winter States  

Science Conference Proceedings (OSTI)

The dense network of the Surface Heat Budget of the Arctic (SHEBA) observations is used to assess relationships between winter surface and atmospheric variables as the SHEBA site came under the influence of cyclonic and anticyclonic atmospheric ...

Kirstie Stramler; Anthony D. Del Genio; William B. Rossow

2011-03-01T23:59:59.000Z

348

6, 21612177, 2012 Transition in the  

E-Print Network (OSTI)

to phase transitions in statistical physics. The results impact sea ice albedo, the transmitted radiation the Arctic melt season, the sea ice surface undergoes a remarkable transforma- tion from vast expanses of snow covered ice to complex mosaics of ice and melt ponds. Sea ice albedo, a key parameter in climate

Golden, Kenneth M.

349

The Initiation of Modern “Soft Snowball” and “Hard Snowball” Climates in CCSM3. Part I: The Influences of Solar Luminosity, CO2 Concentration, and the Sea Ice/Snow Albedo Parameterization  

Science Conference Proceedings (OSTI)

The “Snowball Earth” hypothesis, proposed to explain the Neoproterozoic glacial episodes in the period 750–580 million years ago, suggested that the earth was globally covered by ice/snow during these events. This study addresses the problem of ...

Jun Yang; W. Richard Peltier; Yongyun Hu

2012-04-01T23:59:59.000Z

350

Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations  

SciTech Connect

A novel new approach to retrieve cloud microphysical properties from mixed-phase clouds is presented. This algorithm retrieves cloud optical depth, ice fraction, and the effective size of the water and ice particles from ground-based, high-resolution infrared radiance observations. The theoretical basis is that the absorption coefficient of ice is stronger than that of liquid water from 10-13 mm, whereas liquid water is more absorbing than ice from 16-25 um. However, due to strong absorption in the rotational water vapor absorption band, the 16-25 um spectral region becomes opaque for significant water vapor burdens (i.e., for precipitable water vapor amounts over approximately 1 cm). The Arctic is characterized by its dry and cold atmosphere, as well as a preponderance of mixed-phase clouds, and thus this approach is applicable to Arctic clouds. Since this approach uses infrared observations, cloud properties are retrieved at night and during the long polar wintertime period. The analysis of the cloud properties retrieved during a 7 month period during the Surface Heat Budget of the Arctic (SHEBA) experiment demonstrates many interesting features. These results show a dependence of the optical depth on cloud phase, differences in the mode radius of the water droplets in liquid-only and mid-phase clouds, a lack of temperature dependence in the ice fraction for temperatures above 240 K, seasonal trends in the optical depth with the clouds being thinner in winter and becoming more optically thick in the late spring, and a seasonal trend in the effective size of the water droplets in liquid-only and mixed-phase clouds that is most likely related to aerosol concentration.

Turner, David D.

2003-06-01T23:59:59.000Z

351

Review of science issues, deployment strategy, and status for the ARM north slope of Alaska-Adjacent Arctic Ocean climate research site  

SciTech Connect

Recent climate modeling results point to the Arctic as a region that is particularly sensitive to global climate change. The Arctic warming predicted by the models to result from the expected doubling of atmospheric carbon dioxide is two to three times the predicted mean global warming, and considerably greater than the warming predicted for the Antarctic. The North Slope of Alaska-Adjacent Arctic Ocean (NSA-AAO) Cloud and Radiation Testbed (CART) site of the Atmospheric Radiation Measurement (ARM) Program is designed to collect data on temperature-ice-albedo and water vapor-cloud-radiation feedbacks, which are believed to be important to the predicted enhanced warming in the Arctic. The most important scientific issues of Arctic, as well as global, significance to be addressed at the NSA-AAO CART site are discussed, and a brief overview of the current approach toward, and status of, site development is provided. ARM radiometric and remote sensing instrumentation is already deployed and taking data in the perennial Arctic ice pack as part of the SHEBA (Surface Heat Budget of the Arctic ocean) experiment. In parallel with ARM`s participation in SHEBA, the NSA-AAO facility near Barrow was formally dedicated on 1 July 1997 and began routine data collection early in 1998. This schedule permits the US Department of Energy`s ARM Program, NASA`s Arctic Cloud program, and the SHEBA program (funded primarily by the National Science Foundation and the Office of Naval Research) to be mutually supportive. In addition, location of the NSA-AAO Barrow facility on National Oceanic and Atmospheric Administration land immediately adjacent to its Climate Monitoring and Diagnostic Laboratory Barrow Observatory includes NOAA in this major interagency Arctic collaboration.

Stamnes, K. [Univ. of Alaska, Fairbanks, AK (United States). Geophysical Inst.; Ellingson, R.G. [Univ. of Maryland, College Park, MD (United States). Dept. of Meteorology; Curry, J.A. [Univ. of Colorado, Boulder, CO (United States). Dept. of Aerospace and Engineering Sciences; Walsh, J.E. [Univ. of Illinois, Urbana, IL (United States). Dept. of Atmospheric Sciences; Zak, B.D. [Sandia National Labs., Albuquerque, NM (United States)

1999-01-01T23:59:59.000Z

352

Overview of Arctic Cloud and Radiation Characteristics  

Science Conference Proceedings (OSTI)

To provide a background for ARM's activities at the North Slope of Alaska/Adjacent Arctic Ocean sites, an overview is given of our current state of knowledge of Arctic cloud and radiation properties and processes. The authors describe the Arctic ...

Judith A. Curry; Julie L. Schramm; William B. Rossow; David Randall

1996-08-01T23:59:59.000Z

353

Transmission of Solar Radiation by Clouds over Snow and Ice Surfaces. Part II: Cloud Optical Depth and Shortwave Radiative Forcing from Pyranometer Measurements in the Southern Ocean  

Science Conference Proceedings (OSTI)

Downward solar irradiance at the sea surface, measured on several voyages of an icebreaker in the Southern Ocean, is used to infer transmittance of solar radiation by clouds. Together with surface albedo estimated from coincident hourly sea ice ...

Melanie F. Fitzpatrick; Stephen G. Warren

2005-11-01T23:59:59.000Z

354

Federal Energy Management Program: Greenhouse Gas Basics  

NLE Websites -- All DOE Office Websites (Extended Search)

Basics Basics Federal agencies must understand key terms and management basics to successfully manage greenhouse gas (GHG) emissions. Graphic of the top half of earth depicting current arctic sea ice. A red outline depicts arctic sea ice boundaries in 1979. Current arctic sea ice is shown roughly 50% smaller than the 1979 depiction. Greenhouse gases correlate directly to global warming, which impacts arctic sea ice. This image shows current arctic sea ice formation. The red outline depicts arctic sea ice boundaries in 1979. Greenhouse gases are trace gases in the lower atmosphere that trap heat through a natural process called the "greenhouse effect." This process keeps the planet habitable. International research has linked human activities to a rapid increase in GHG concentrations in the atmosphere, contributing to major shifts in the global climate.

355

A 22-Year Dataset of Surface Longwave Fluxes in the Arctic  

NLE Websites -- All DOE Office Websites (Extended Search)

22-Year Dataset of Surface Longwave Fluxes 22-Year Dataset of Surface Longwave Fluxes in the Arctic J. Francis and J. Secora Institute of Marine and Coastal Sciences Rutgers University New Brunswick, New Jersey Abstract Downwelling longwave fluxes (DLFs) over the Arctic surface have been generated from 22.5 years of radiances and retrievals from the TIROS (television and infrared observation satellite) operational vertical sounder (TOVS). The flux retrieval algorithm has been validated and improved using surface- based radiation and cloud observations from the Atmospheric Radiation Measurement (ARM) North Slope of Alaska (NSA) site in Barrow, Alaska, and from the Surface Heat Balance of the Arctic (SHEBA) field program (1997-98) in the Beaufort Sea. The DLF product is presented on a 100 x

356

Tropical Air–Sea Interactions Accelerate the Recovery of the Atlantic Meridional Overturning Circulation after a Major Shutdown  

Science Conference Proceedings (OSTI)

Using a coupled ocean–sea ice–atmosphere model of intermediate complexity, the authors study the influence of air–sea interactions on the stability of the Atlantic Meridional Overturning Circulation (AMOC). Mimicking glacial Heinrich events, a ...

Uta Krebs; A. Timmermann

2007-10-01T23:59:59.000Z

357

Aging of Accreted Ice  

Science Conference Proceedings (OSTI)

The effect of annealing in accreted ice has been investigated for artificially grown ice deposits after 100 days of storage in a deep freeze unit. Cross sections of the cylindrical deposits have been cut and replicated soon after growth and ...

F. Prodi; L. Levi

1980-06-01T23:59:59.000Z

358

ARM - Measurement - Ice nuclei  

NLE Websites -- All DOE Office Websites (Extended Search)

to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Ice nuclei Small particles around which ice particles form. Categories Cloud Properties...

359

Anemometry in Icing Conditions  

Science Conference Proceedings (OSTI)

The accuracy of wind measurements in icing conditions is discussed, and wind tunnel calibrations as well as field comparisons are presented for three heated anemometers that use different measuring principles. It is pointed out that ice-free ...

Lasse Makkonen; Pertti Lehtonen; Lauri Helle

2001-09-01T23:59:59.000Z

360

Ice electrode electrolytic cell  

DOE Patents (OSTI)

This invention relates to a method and apparatus for removing heavy metals from waste water, soils, or process streams by electrolytic cell means. The method includes cooling a cell cathode to form an ice layer over the cathode and then applying an electric current to deposit a layer of the heavy metal over the ice. The metal is then easily removed after melting the ice. In a second embodiment, the same ice-covered electrode can be employed to form powdered metals.

Glenn, David F. (Idaho Falls, ID); Suciu, Dan F. (Idaho Falls, ID); Harris, Taryl L. (Idaho Falls, ID); Ingram, Jani C. (Idaho Falls, ID)

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Ice electrode electrolytic cell  

DOE Patents (OSTI)

This invention relates to a method and apparatus for removing heavy metals from waste water, soils, or process streams by electrolytic cell means. The method includes cooling a cell cathode to form an ice layer over the cathode and then applying an electric current to deposit a layer of the heavy metal over the ice. The metal is then easily removed after melting the ice. In a second embodiment, the same ice-covered electrode can be employed to form powdered metals.

Glenn, D.F.; Suciu, D.F.; Harris, T.L.; Ingram, J.C.

1993-04-06T23:59:59.000Z

362

Stability of ferroelectric ice  

E-Print Network (OSTI)

We theoretically study the stability conditions of the ferroelectric ice of the Cmc21 structure, which has been considered, for decades, one of the most promising candidates of the low temperature proton-ordered phase of pure ice Ih. It turned out that the Cmc21 structure is stable only with a certain amount of dopant and the true proton-ordered phase of pure ice Ih remains to be found at lower temperature. Implication for spin ice is mentioned.

Iitaka, Toshiaki

2010-01-01T23:59:59.000Z

363

Ice electrode electrolytic cell  

DOE Patents (OSTI)

This invention relates to a method and apparatus for removing heavy metals from waste water, soils, or process streams by electrolytic cell means. The method includes cooling a cell cathode to form an ice layer over the cathode and then applying an electric current to deposit a layer of the heavy metal over the ice. The metal is then easily removed after melting the ice. In a second embodiment, the same ice-covered electrode can be employed to form powdered metals.

Glenn, D.F.; Suciu, D.F.; Harris, T.L.; Ingram, J.C.

1992-12-31T23:59:59.000Z

364

The Necklace around the Arctic Arctic indigenous peoples  

E-Print Network (OSTI)

national choir). #12;The economies of the Arctic settlements invariably involve fish, oil or gas: natural in the 1002 area. This work was undertaken by a private exploration firm and funded by a group of oil exploration apparently began abruptly in A.D. 793 with an attack on Lindesfarne, an island off the NE

365

Explorations of Atmosphere–Ocean–Ice Climates on an Aquaplanet and Their Meridional Energy Transports  

Science Conference Proceedings (OSTI)

The degree to which total meridional heat transport is sensitive to the details of its atmospheric and oceanic components is explored. A coupled atmosphere, ocean, and sea ice model of an aquaplanet is employed to simulate very different climates—...

Daniel Enderton; John Marshall

2009-06-01T23:59:59.000Z

366

Elimination of the Greenland Ice Sheet in a High CO2 Climate  

Science Conference Proceedings (OSTI)

Projections of future global sea level depend on reliable estimates of changes in the size of polar ice sheets. Calculating this directly from global general circulation models (GCMs) is unreliable because the coarse resolution of 100 km or more ...

J. K. Ridley; P. Huybrechts; J. M. Gregory; J. A. Lowe

2005-09-01T23:59:59.000Z

367

Rapid Holocene Deglaciation of the Labrador Sector of the Laurentide Ice Sheet  

Science Conference Proceedings (OSTI)

Retreat of the Laurentide Ice Sheet (LIS) following the Last Glacial Maximum 21 000 yr BP affected regional to global climate and accounted for the largest proportion of sea level rise. Although the late Pleistocene LIS retreat chronology is ...

Anders E. Carlson; Peter U. Clark; Grant M. Raisbeck; Edward J. Brook

2007-10-01T23:59:59.000Z

368

Evaluation of Greenland Ice Sheet Surface Climate in the HIRHAM Regional Climate Model Using Automatic Weather Station Data  

Science Conference Proceedings (OSTI)

The 1998 annual cycle and 1991–98 summer simulations of Greenland ice sheet surface climate are made with the 0.5°-horizontal resolution HIRHAM regional climate model of the Arctic. The model output is compared with meteorological and energy ...

Jason E. Box; Annette Rinke

2003-05-01T23:59:59.000Z

369

Research Highlight  

NLE Websites -- All DOE Office Websites (Extended Search)

Predicting Arctic Sea Ice Loss Download a printable PDF Submitter: Liu, X., University of Wyoming Area of Research: Cloud-Aerosol-Precipitation Interactions Working Group(s):...

370

Ice-Seawater Turbulent Boundary Layer Interaction with Melting or Freezing  

Science Conference Proceedings (OSTI)

A second-moment, turbulence closure model is applied to the problem of the dynamic and thermodynamic interaction of sea ice and the ocean surface mixed layer. In the case of ice moving over a warm, ocean surface layer, melting is intrinsically a ...

George L. Mellor; Miles G. McPhee; Michael Steele

1986-11-01T23:59:59.000Z

371

Impact of a Two-Way Coupling between an Atmospheric and an Ocean-Ice Model over the Gulf of St. Lawrence  

Science Conference Proceedings (OSTI)

The purpose of this study is to present the impacts of a fully interactive coupling between an atmospheric and a sea ice model over the Gulf of St. Lawrence, Canada. The impacts are assessed in terms of the atmospheric and sea ice forecasts ...

Pierre Pellerin; Harold Ritchie; François J. Saucier; François Roy; Serge Desjardins; Michel Valin; Vivian Lee

2004-06-01T23:59:59.000Z

372

Synoptic Aerial Surveys and Abundance Estimates for Ice-associated Seals in US and Russian Waters Michael Cameron, Peter Boveng, Erin Moreland and Jay Ver Hoef  

E-Print Network (OSTI)

Synoptic Aerial Surveys and Abundance Estimates for Ice-associated Seals in US and Russian Waters synoptic aerial surveys of the eastern Bering Sea in tandem with Russian researchers employed to survey. Testing a ship-based Unmanned Aerial System (UAS) for surveying the Bering Sea pack ice. AFSC Quarterly

373

Natural and anthropogenic radionuclides in the marginal seas of Siberia: implications for the fate and removal of pollutants  

E-Print Network (OSTI)

Natural and anthropogenic radionuclides have been widely used to trace the sources and fate of radioactive pollutants in the marine environment. In this study, particle-reactive radionuclides such as ... Ph and 214 Th have been employed for scavenging studies. The inventories of Pu and radiocesium and activity ratios of Pu (such as 238PU/239,24OPu) have been utilized to determine the sources and transport of anthropogenic pollutants. Water soluble tracers such as Ra isotopes and radiocesium have been used to determine the water mass movements as well as residence time of water masses. This will help to define the processes related to estuarine mixing over the continental shelf which control radioactive and other pollutants entering surface waters of the Arctic Ocean. 21OPb and 214 Th concentrations were measured in a suite of water samples (dissolved and particulate phases) from the marginal seas of the Russian Arctic (Pechora, Kara, Laptev, and East Siberian Seas) in order to better understand scavenging within the water column. To elucidate the sources of Pu and 131CS to the study area, Pu and "'Cs concentrations and 238PU/239,240puactivity ratios were measured in water samples. Concentrations of Ra isotopes were also determined for the estimation of the residence time of river water entering the Kara Sea. The model-derived scavenging parameters for 114 Th and "OPb clearly indicate particle concentrations, influenced by resuspension, ice melt, and continental runoff, primarily control the removal of these nuclides. Concentrations and inventories of Pu and "'Cs as well the activity ratio of "IpU/219,l4OpU suggest two main sources of Pu and "'Cs to the waters over the Siberian shelf. an oceanic source, likely from Sellafield and La Hague nuclear reprocessing plants, and a riverine source emanating from estuarine sediments . 21lpU/219,24OPu activity ratios suggest all of the Pu entering into shelf waters by way of Siberian rivers is from Global Fallout. The Pu concentrations are also primarily controlled by the particle concentrations in the water column. River water residence times for the surface and subsurface waters of the Kara Sea were estimated, using2l'Ra/22'Ra activity ratios, to be on the order of one year and 30 years, respectively.

Schwantes, Jon Michael

1996-01-01T23:59:59.000Z

374

Potential Oil Production from the Coastal Plain of the Arctic ...  

U.S. Energy Information Administration (EIA)

1. Overview of the Arctic National Wildlife Refuge. Background. The Arctic National Wildlife Refuge (ANWR) 1002 Area of the Alaska North Slope represents an area ...

375

Parameterization of an Iceberg Drift Model in the Barents Sea  

Science Conference Proceedings (OSTI)

The problem of parameter estimation is examined for an iceberg drift model of the Barents Sea. The model is forced by atmospheric reanalysis data from ECMWF and ocean and sea ice variables from the Hybrid Coordinate Ocean Model (HYCOM). The model ...

Intissar Keghouche; Laurent Bertino; Knut Arild Lisæter

2009-10-01T23:59:59.000Z

376

The ecology of Arctic cod (Boreogadus saida) and interactions with seabirds, seals, and whales in the Canadian Arctic.  

E-Print Network (OSTI)

??This thesis investigates the foraging of Arctic cod (Boreogadus saida) and its predators during the summer in the Canadian Arctic. Findings included the identification of… (more)

Matley, Jordan

2012-01-01T23:59:59.000Z

377

Liquid Nitrogen Ice Cream  

NLE Websites -- All DOE Office Websites (Extended Search)

Liquid Nitrogen Ice Cream If you have access to liquid nitrogen and the proper safety equipment and training, try this in place of your normal cryogenics demonstration Download...

378

An ice lithography instrument  

SciTech Connect

We describe the design of an instrument that can fully implement a new nanopatterning method called ice lithography, where ice is used as the resist. Water vapor is introduced into a scanning electron microscope (SEM) vacuum chamber above a sample cooled down to 110 K. The vapor condenses, covering the sample with an amorphous layer of ice. To form a lift-off mask, ice is removed by the SEM electron beam (e-beam) guided by an e-beam lithography system. Without breaking vacuum, the sample with the ice mask is then transferred into a metal deposition chamber where metals are deposited by sputtering. The cold sample is then unloaded from the vacuum system and immersed in isopropanol at room temperature. As the ice melts, metal deposited on the ice disperses while the metals deposited on the sample where the ice had been removed by the e-beam remains. The instrument combines a high beam-current thermal field emission SEM fitted with an e-beam lithography system, cryogenic systems, and a high vacuum metal deposition system in a design that optimizes ice lithography for high throughput nanodevice fabrication. The nanoscale capability of the instrument is demonstrated with the fabrication of nanoscale metal lines.

Han, Anpan [Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States); Chervinsky, John [School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States); Branton, Daniel [Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138 (United States); Golovchenko, J. A. [Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States); School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States)

2011-06-15T23:59:59.000Z

379

Transporting Dry Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

Requirements for Shipping Dry Ice IATA PI 904 Source: Reg of the Day from ERCweb 2006 Environmental Resource Center | 919-469-1585 | webmaster@ercweb.com http:...

380

Mobile Ice Nucleus Spectrometer  

SciTech Connect

This first year report presents results from a computational fluid dynamics (CFD) study to assess the flow and temperature profiles within the mobile ice nucleus spectrometer.

Kulkarni, Gourihar R.; Kok, G. L.

2012-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Alaskan Ice Road Water Supplies Augmented by Snow Barriers  

NLE Websites -- All DOE Office Websites (Extended Search)

6, 2013 6, 2013 Alaskan Ice Road Water Supplies Augmented by Snow Barriers Washington, D.C. - In a project supported and managed by the Office of Fossil Energy's National Energy Technology Laboratory (NETL), researchers at the University of Alaska Fairbanks have demonstrated that the use of artificial barriers-snow fences-can significantly increase the amount of fresh water supplies in Arctic lakes at a fraction of the cost of bringing in water from nearby lakes. The results promise to enhance environmentally sound development of Alaska's natural resources, lowering the costs of building ice roads used for exploring for oil and natural gas in Alaska. They could also be used to help augment fresh water supplies at remote villages. Researcher Joel Bailey measures the density of the snow in this snow pit to determine the amount of snow in the drift and the water equivalent of the snow drift.

382

Indirect and Semi-Direct Aerosol Campaign: The Impact of Arctic Aerosols on Clouds  

SciTech Connect

A comprehensive dataset of microphysical and radiative properties of aerosols and clouds in the arctic boundary layer in the vicinity of Barrow, Alaska was collected in April 2008 during the Indirect and Semi-Direct Aerosol Campaign (ISDAC) sponsored by the Department of Energy Atmospheric Radiation Measurement (ARM) and Atmospheric Science Programs. The primary aim of ISDAC was to examine indirect effects of aerosols on clouds that contain both liquid and ice water. The experiment utilized the ARM permanent observational facilities at the North Slope of Alaska (NSA) in Barrow. These include a cloud radar, a polarized micropulse lidar, and an atmospheric emitted radiance interferometer as well as instruments specially deployed for ISDAC measuring aerosol, ice fog, precipitation and spectral shortwave radiation. The National Research Council of Canada Convair-580 flew 27 sorties during ISDAC, collecting data using an unprecedented 42 cloud and aerosol instruments for more than 100 hours on 12 different days. Data were obtained above, below and within single-layer stratus on 8 April and 26 April 2008. These data enable a process-oriented understanding of how aerosols affect the microphysical and radiative properties of arctic clouds influenced by different surface conditions. Observations acquired on a heavily polluted day, 19 April 2008, are enhancing this understanding. Data acquired in cirrus on transit flights between Fairbanks and Barrow are improving our understanding of the performance of cloud probes in ice. Ultimately the ISDAC data will be used to improve the representation of cloud and aerosol processes in models covering a variety of spatial and temporal scales, and to determine the extent to which long-term surface-based measurements can provide retrievals of aerosols, clouds, precipitation and radiative heating in the Arctic.

McFarquhar, Greg; Ghan, Steven J.; Verlinde, J.; Korolev, Alexei; Strapp, J. Walter; Schmid, Beat; Tomlinson, Jason M.; Wolde, Mengistu; Brooks, Sarah D.; Cziczo, Daniel J.; Dubey, Manvendra K.; Fan, Jiwen; Flynn, Connor J.; Gultepe, Ismail; Hubbe, John M.; Gilles, Mary K.; Laskin, Alexander; Lawson, Paul; Leaitch, W. R.; Liu, Peter S.; Liu, Xiaohong; Lubin, Dan; Mazzoleni, Claudio; Macdonald, A. M.; Moffet, Ryan C.; Morrison, H.; Ovchinnikov, Mikhail; Shupe, Matthew D.; Turner, David D.; Xie, Shaocheng; Zelenyuk, Alla; Bae, Kenny; Freer, Matthew; Glen, Andrew

2011-02-01T23:59:59.000Z

383

Arctic Inversion Strength in Climate Models  

Science Conference Proceedings (OSTI)

Recent work indicates that climate models have a positive bias in the strength of the wintertime low-level temperature inversion over the high-latitude Northern Hemisphere. It has been argued this bias leads to underestimates of the Arctic’s ...

Brian Medeiros; Clara Deser; Robert A. Tomas; Jennifer E. Kay

2011-09-01T23:59:59.000Z

384

Skin supersolidity slipperizing ice  

E-Print Network (OSTI)

Consistency between theory predictions and measurements and calculations revealed that the skin of ice, containing water molecules with fewer than four neighbours, forms a supersolid phase that is highly polarized, elastic, hydrophobic, with ultra-low density and high thermal stability. The supersolidity of skin sliperizes ice.

Xi Zhang; Yongli Huang; a Zengsheng Ma; Yichun Zhou; Chang Q Sun

2013-10-03T23:59:59.000Z

385

Reionization on ice  

E-Print Network (OSTI)

The case for substantial far infrared ice emission in local ultraluminous infrared galaxies, expected based on the presence of mid-infrared ice absorption in their spectra and the known far infrared optical properties of ice, is still largely unsupported by direct observation owing to insufficient far infrared spectral coverage. Some marginal supportive evidence is presented here. A clear consequence of far infrared ice emission is the need to extend the range of redshifts considered for submillimeter sources. This is demonstrated via the example of HDF 850.1. The solid phase of the ISM during reionization may be dominated by ice, and this could lead to the presence of reionization sources in submillimeter source catalogs. Submillimeter sources not detected at 24 micron in the GOODS-N field are examined. Two candidate reionization sources are identified at 3.6 micron through possible Gunn-Peterson saturation in the Z band.

C. C. Dudley; M. Imanishi; P. R. Maloney

2006-02-15T23:59:59.000Z

386

A Comparison of Measured and Modeled Broadband Fluxes from Aircraft Data during the ICE '89 Field Experiment  

Science Conference Proceedings (OSTI)

During the 1989 intensive field campaign of the International Cirrus Experiment (ICE) over the North Sea, broadband radiative fluxes were measured in, above, and below cirrus cloud by a number of European meteorological research aircraft. One ...

R. W. Saunders; G. Brogniez; J. C. Buriez; R. Meerkötter; P. Wendling

1992-08-01T23:59:59.000Z

387

Microphysical and Radiative Effects of Ice Clouds on Tropical Equilibrium States: A Two-Dimensional Cloud-Resolving Modeling Study  

Science Conference Proceedings (OSTI)

The microphysical and radiative effects of ice clouds on tropical equilibrium states are investigated based on three two-dimensional cloud-resolving simulations imposed by zero vertical velocity and time-invariant zonal wind and sea surface ...

Fan Ping; Zhexian Luo; Xiaofan Li

2007-07-01T23:59:59.000Z

388

Ice Cream with a Heart Create a new Clemson Ice  

E-Print Network (OSTI)

Ice Cream with a Heart Contest! Create a new Clemson Ice Cream flavor! Raise money for your favorite charity! Win a free Clemson Ice Cream party for your organization! Enter at www organizations. The contest is called Ice Cream with a Heart and its purpose is to help student organizations

Bolding, M. Chad

389

LES Simulations of Roll Clouds Observed During Mixed- Phase Arctic Cloud Experiment  

SciTech Connect

Roll clouds, and associated roll convection, are fairly common features of the atmospheric boundary layer. While these organized cumuliform clouds are found over many regions of the planet, they are quite ubiquitous near the edge of the polar ice sheets. In particular, during periods of off-ice flow, when cold polar air flows from the ice pack over the relatively warm ocean water, strong boundary layer convection develops along with frequent rolls. According to Bruemmer and Pohlman (2000), most of the total cloud cover in the Arctic is due to roll clouds. In an effort to examine the influences of mixed-phase microphysics on the boundary layer evolution of roll clouds during off-ice flow, Olsson and Harrington (2000) used a 2D mesoscale model coupled to a bulk microphysical scheme (see Section 2). Their results showed that mixed-phase clouds produced more shallow boundary layers with weaker turbulence than liquid-phase cases. Furthermore, their results showed that because of th e reduced turbulent drag on the atmosphere in the mixed-phase case, regions of mesoscale divergence in the marginal ice-zone were significantly affected. A follow-up 2D study (Harrington and Olsson 2001) showed that the reduced turbulent intensity in mixed-phase cases was due to precipitation. Ice precipitation caused downdraft stabilization which fed back and caused a reduction in the surface heat fluxes. In this work, we extend the work of Olsson and Harrington (2000) and Harrington and Olsson (2001) by examining the impacts of ice microphysics on roll convection. We will present results that illustrate how microphysics alters roll cloud structure and dynamics.

Greenberg, S.D.; Harrington, J.Y.; Prenni, A.; DeMott, P.

2005-03-18T23:59:59.000Z

390

Representation of Arctic Mixed-Phase clouds and the Wegener-Bergeron-Findeisen Process in Climate Models: Perspectives from a Cloud-Resolving Study  

SciTech Connect

Two types of Arctic mixed-phase clouds observed during the ISDAC and M-PACE field campaigns are simulated using a 3-dimensional cloud-resolving model (CRM) with size-resolved cloud microphysics. The modeled cloud properties agree reasonably well with aircraft measurements and surface-based retrievals. Cloud properties such as the probability density function (PDF) of vertical velocity (w), cloud liquid and ice, the regime of ice growth at the expense of liquid water (i.e., Wegener-Bergeron-Findeisen (WBF) process), and the inherent relationships among cloud properties/processes in the mixed-phase layers are examined to gain insights for improving the representation of the mixed-phase processes in General Circulation Models (GCMs). We find that, the WBF process only occurs in about 50% of the mixed-phase regime with the vast majority occurring in the downdrafts. In updrafts both liquid and ice grow simultaneously. But in GCMs, it is not necessary to treat the WBF process at the subgrid scale. Our CRM results produce a w distribution well represented by a Gaussian normal function, validating, at least for arctic clouds, the subgrid treatment used in GCMs. Our CRM results also support the assumption frequently used in GCMs that mixed phase clouds maintain water vapor very near liquid saturation. A Gamma function with a fixed variance does not accurately represent the subgrid variability of cloud liquid. The PDFs of cloud liquid and cloud ice can be fitted with Gamma functions, and a normal function can be used for total water, but the variance should not be fixed. The relationship between the ice depositional growth rate and cloud ice strongly depends on the capacitance of ice particles. The assumption for the capacitance of ice particles (e.g., 1.0 for spheres) used in GCMs could lead to a large deviation in ice depositional growth. At large sales, the maximum overlap assumption looks appropriate.

Fan, Jiwen; Ghan, Steven J.; Ovchinnikov, Mikhail; Liu, Xiaohong; Rasch, Philip J.; Korolev, Alexei

2011-09-20T23:59:59.000Z

391

Sea Mammals:  

Office of Legacy Management (LM)

Sea Mammals: Sea Mammals: Resources and Population The nanrine mammal resources nenr Amchitkn Island consist o f sea otters, harbor seals, and Steller sea 1io11s as perntnnent residents, northern fur seals that migrate througla Aleutian passes, and wholes nnd porpoises in the surrouttdiftg seas. Archaeological and historic data on nni~nnl populations indicate that the species present tlten were the same as those present today nnd dentoxstrate tlre contii~ued importawe that sea mammals haue played in tlre island's history. Sen otter observations nnd surueys made front 1935 to 1974 document the recovery of this species Carl E. Abegglen* U. S. Fish and It'ildlife Service, Division of I\'ildlife Research, Anchorage, Alaska from near extinction at the start of the twentieth century.

392

Fish Smother Under Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

Smother Under Ice Smother Under Ice A BULLETIN FOR THE CHICAGO PUBLIC SCHOOLS DESIGNED FOR INCLUSION IN THE WEEKLY ANNOUNCEMENT SENT OUT FROM THE OFFICE OF SUPT. WILLIAM H. JOHNSON Clayton F. Smith, President Roberts Mann, Superintendent of Conservation February 1, 1945 Nature Bulletin No. 1 FOREST PRESERVE NOTES Grown-ups, who used to kive on a farm or in a small town, are fond of talking about the old-fashioned winters "when I was a boy" and the winters that grandpa used to tell about. Well, one would have to go back a long, long time to find a winter as severe as this one. FISH SMOTHER UNDER ICE Lakes and streams breathe the same as living things. When they are covered with ice and snow they cannot get air and they much hold their breath until the ice thaws. While they are holding their breath the oxygen in the water is gradually used up by the living things sealed up in it -- fish, plants "bugs", snails, and hosts of microscopic life. If the ice lasts long enough, these living things die one after another as each kind reaches the point where it cannot stand any further oxygen starvation. Sometimes temporary relief is given by rains and melting snow that bring fresh, serated water under the ice, but no method of artificial respiration has been found that works. Sometimes, too, when water plants get enough sunlight through clear ice they produce small amounts of oxygen and delay the suffocation of the fish, etc.; but when snow and cloudy ice cuts off the light this does not happen.

393

Energy (Oil and Gas) Exploration (and Development) on the U.S.  

E-Print Network (OSTI)

Energy (Oil and Gas) Exploration (and Development) on the U.S. Arctic Continental Shelf Jeff Walker of an Ice-Diminishing Arctic on Exploratory Activities Arctic nations will pursue oil and gas. Offshore;#12;Beaufort Sea Oil and Gas Lease Status #12;Chukchi Sea Oil and Gas Leasing Status #12;Alaska OCS Lease Sales

Kuligowski, Bob

394

Vortex ice in nanostructured superconductors  

SciTech Connect

We demonstrate using numerical simulations of nanostructured superconductors that it is possible to realize vortex ice states that are analogous to square and kagome ice. The system can be brought into a state that obeys either global or local ice rules by applying an external current according to an annealing protocol. We explore the breakdown of the ice rules due to disorder in the nanostructure array and show that in square ice, topological defects appear along grain boundaries, while in kagome ice, individual defects appear. We argue that the vortex system offers significant advantages over other artificial ice systems.

Reichhardt, Charles [Los Alamos National Laboratory; Reichhardt, Cynthia J [Los Alamos National Laboratory; Libal, Andras J [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

395

DIFFRACTION STUDIES OF ICE Alexe BOSAK  

E-Print Network (OSTI)

as ice-nine [K. Vonnegut, Cat's Cradle] #12;Phase diagram of water #12;Phase diagram of water Here we areDIFFRACTION STUDIES OF ICE Alexeï BOSAK European Synchrotron Radiation Facility #12;Ice as the mild threat ice Ih the only ice in the crust #12;Ice as the absolute weapon Ice IX : melting point 45.8°C

Titov, Anatoly

396

Prediction of Vessel Icing  

Science Conference Proceedings (OSTI)

Vessel icing from wave-generated spray is a severe hazard to expanded marine operations in high latitudes. Hardships in making observations during operations, combined with differences in vessel type and heading, have resulted in great ...

J. E. Overland; C. H. Pease; R. W. Preisendorfer; A. L. Comiskey

1986-12-01T23:59:59.000Z

397

Sublimation of Ice Crystals  

Science Conference Proceedings (OSTI)

Recent experiments on the sublimation of single crystals of ice in an atmosphere of air indicate that the sublimation rate is diffusion limited and initially solid prismatic crystals evolve into time-independent shapes similar to confocal ...

Jon Nelson

1998-03-01T23:59:59.000Z

398

Global Warming, Soot, Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

Global Warming, Soot, Ice Speaker(s): James Hansen Date: November 7, 2003 - 12:00pm Location: 90-3122 Irreversible "dangerous anthropogenic interference" with the climate system...

399

Global ice sheet modeling  

Science Conference Proceedings (OSTI)

The University of Maine conducted this study for Pacific Northwest Laboratory (PNL) as part of a global climate modeling task for site characterization of the potential nuclear waste respository site at Yucca Mountain, NV. The purpose of the study was to develop a global ice sheet dynamics model that will forecast the three-dimensional configuration of global ice sheets for specific climate change scenarios. The objective of the third (final) year of the work was to produce ice sheet data for glaciation scenarios covering the next 100,000 years. This was accomplished using both the map-plane and flowband solutions of our time-dependent, finite-element gridpoint model. The theory and equations used to develop the ice sheet models are presented. Three future scenarios were simulated by the model and results are discussed.

Hughes, T.J.; Fastook, J.L. [Univ. of Maine, Orono, ME (United States). Institute for Quaternary Studies

1994-05-01T23:59:59.000Z

400

Environmental Phenomena of the Beaufort Sea Observed during the Leads Experiment  

Science Conference Proceedings (OSTI)

This paper describes unique environmental phenomena observed during LEADEX (Leads Experiment), a multidisciplinary investigation staged from an ice camp in the Beaufort Sea during March and April 1992. The paper focuses on phenomena observed by ...

Robert W. Fett; Stephen D. Burk; William T. Thompson; Thomas L. Kozo

1994-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Atmospheric Meridional Moisture Flux over the Southern Ocean: A Story of the Amundsen Sea  

Science Conference Proceedings (OSTI)

The Antarctic ice sheet constitutes the largest reservoir of freshwater on earth, representing tens of meters of sea level rise if it was to melt completely. However, due to the remote location of the continent and the concomitant sparse data ...

Maria Tsukernik; Amanda H. Lynch

402

Contractor SOW Template - ICE | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SOW Template - ICE Contractor SOW Template - ICE Contractor SOW Template - ICE.pdf More Documents & Publications Contractor SOW Template - ICR Statement of Work (SOW) Template...

403

Storm Studies in the Arctic (STAR)  

Science Conference Proceedings (OSTI)

The Storm Studies in the Arctic (STAR) network (2007–2010) conducted a major meteorological field project from 10 October–30 November 2007 and in February 2008, focused on southern Baffin Island, Nunavut, Canada—a region that experiences intense ...

John Hanesiak; Ronald Stewart; David Barber; George Liu; Justin Gilligan; Danielle Desjardins; Robyn Dyck; Shannon Fargey; Klaus Hochheim; Rebekah Martin; Peter Taylor; Sumita Biswas; Mark Gordon; Marna Albarran Melzer; Kent Moore; Robert Field; Carling Hay; Shunli Zhang; Gordon McBean; Walter Strapp; David Hudak; John Scott; Mengistu Wolde; Ron Goodson; Edward Hudson; Gabrielle Gascon; Heather Greene; William Henson; Alex Laplante

2010-01-01T23:59:59.000Z

404

Arctic Ocean circulation patterns revealed by GRACE  

Science Conference Proceedings (OSTI)

Measurements of ocean bottom pressure (OBP) anomalies from the satellite mission GRACE, complemented by information from two ocean models, are used to investigate the variations and distribution of the Arctic Ocean mass from 2002 through 2011. The ...

Cecilia Peralta-Ferriz; James H. Morison; John M. Wallace; Jennifer A. Bonin; Jinlun Zhang

405

The Mixed-Phase Arctic Cloud Experiment  

Science Conference Proceedings (OSTI)

The Mixed-Phase Arctic Cloud Experiment (M-PACE) was conducted from 27 September through 22 October 2004 over the Department of Energy's Atmospheric Radiation Measurement (ARM) Climate Research Facility (ACRF) on the North Slope of Alaska. The ...

J. Verlinde; J. Y. Harrington; V. T. Yannuzzi; A. Avramov; S. Greenberg; S. J. Richardson; C. P. Bahrmann; G. M. McFarquhar; G. Zhang; N. Johnson; M. R. Poellot; J. H. Mather; D. D. Turner; E. W. Eloranta; D. C. Tobin; R. Holz; B. D. Zak; M. D. Ivey; A. J. Prenni; P. J. DeMott; J. S. Daniel; G. L. Kok; K. Sassen; D. Spangenberg; P. Minnis; T. P. Tooman; M. Shupe; A. J. Heymsfield; R. Schofield

2007-02-01T23:59:59.000Z

406

Statistical Analysis of Global Surface Temperature and Sea Level Using Cointegration Methods  

Science Conference Proceedings (OSTI)

Global sea level rise is widely understood as a consequence of thermal expansion and the melting of glaciers and land-based ice caps. Because of the lack of representation of ice-sheet dynamics in present-day physically based climate models, ...

Torben Schmith; Søren Johansen; Peter Thejll

2012-11-01T23:59:59.000Z

407

Variability of warm deep water inflow in a submarine trough on the Amundsen Sea Shelf  

Science Conference Proceedings (OSTI)

The ice shelves in the Amundsen Sea are thinning rapidly, and the main reason for their decline appears to be warm ocean currents circulating below the ice shelves and melting these from below. Ocean currents transport warm dense water onto the ...

A. K. Wåhlin; O. Kalén; L. Arneborg; G. Björk; G. K. Carvajal; H. K. Ha; T. W. Kim; S. H. Lee; J. H. Lee; C. Stranne

408

Ice cream headache  

NLE Websites -- All DOE Office Websites (Extended Search)

Ice cream headache Ice cream headache Name: fath Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: What causes an "ice cream headache"? Are they dangerous? What would happen if I induced an ice cream headache when I had a regular headache? Replies: This is really a neat question. I am certainly no expert on headaches, but it has a lot to do blood circulation in the sinuses and around and within the brain. Why do some people get them easily and other seem resistant? The cold might restrict blood flow which is the basis for the problem. An Ice cream headache can be turned "on" or "off" by adjusting the rate of consumption, Slurpees work best, so really cold stuff enhances the effect. Are there stages: cold sensation, lingering headache, subsiding headache, warming, etc? Does the cold actually create similar headache "conditions" or does the brain confused cause it cannot directly feel pain? The difference in people is probably due to differences in arteriole branching and general circulation. In my experience smokers get worse headaches than nonsmokers of the same age. Do you find a similar trend? I am trying to stimulate discussion!

409

ORNL DAAC, Arctic Tundra Flux Data, February 2002  

NLE Websites -- All DOE Office Websites (Extended Search)

atmospheric fluxes in the Arctic tundra are now available on-line. The newly released data set "Arctic Tundra Flux Study in the Kuparuk River Basin (Alaska), 1994-1996" contains...

410

Is A Sleeping Climate Giant Stirring in the Arctic?  

NLE Websites -- All DOE Office Websites (Extended Search)

Is A Sleeping Climate Giant Stirring in the Arctic? Print E-mail Is a sleeping climate giant stirring in the arctic? Wednesday, June 12, 2013 Featured by NASA a member of the U.S....

411

Arctic Climate Change as Manifest in Cyclone Behavior  

Science Conference Proceedings (OSTI)

The Arctic region has exhibited dramatic changes in recent times. Many of these are intimately tied up with synoptic activity, but little research has been undertaken on how the characteristics of Arctic cyclones have changed. This paper presents ...

Ian Simmonds; Craig Burke; Kevin Keay

2008-11-01T23:59:59.000Z

412

Comments on “Current GCMs' Unrealistic Negative Feedback in the Arctic  

Science Conference Proceedings (OSTI)

In contrast to prior studies showing a positive lapse-rate feedback associated with the Arctic inversion, Boé et al. reported that strong present-day Arctic temperature inversions are associated with stronger negative longwave feedbacks and thus ...

Felix Pithan; Thorsten Mauritsen

2013-10-01T23:59:59.000Z

413

Dynamical and Microphysical Characteristics of Arctic Clouds during BASE  

Science Conference Proceedings (OSTI)

In this study, observations from aircraft, Doppler radar, and LANDSAT are used to better understand dynamical and microphysical characteristics of low-level Arctic clouds for climate change studies. Observations during the Beaufort and Arctic ...

I. Gultepe; G. Isaac; D. Hudak; R. Nissen; J. W. Strapp

2000-04-01T23:59:59.000Z

414

Comments on “Current GCMs’ Unrealistic Negative Feedback in the Arctic  

Science Conference Proceedings (OSTI)

Contrasting our expectation of a positive lapse-rate feedback associated with the Arctic inversion, Boé et al. (2009) report that strong present-day Arctic temperature inversions are associated with stronger negative longwave feedbacks and thus ...

Felix Pithan; Thorsten Mauritsen

415

Vertical Motions in Arctic Mixed-Phase Stratiform Clouds  

Science Conference Proceedings (OSTI)

The characteristics of Arctic mixed-phase stratiform clouds and their relation to vertical air motions are examined using ground-based observations during the Mixed-Phase Arctic Cloud Experiment (MPACE) in Barrow, Alaska, during fall 2004. The ...

Matthew D. Shupe; Pavlos Kollias; P. Ola G. Persson; Greg M. McFarquhar

2008-04-01T23:59:59.000Z

416

Tuktoyaktuk : responsive strategies for a new Arctic urbanism  

E-Print Network (OSTI)

The Canadian Arctic is facing a set of compounding crises that will drastically impact the future of its coastal frontier. At a time when climate change is having a detrimental impact on the Arctic landscape, Northern ...

Ritchot, Pamela (Pamela Rae)

2011-01-01T23:59:59.000Z

417

The Western Arctic Linkage Experiment (WALE): Overview and Synthesis  

Science Conference Proceedings (OSTI)

The primary goal of the Western Arctic Linkage Experiment (WALE) was to better understand uncertainties of simulated hydrologic and ecosystem dynamics of the western Arctic in the context of 1) uncertainties in the data available to drive the ...

A. D. McGuire; J. E. Walsh; J. S. Kimball; J. S. Clein; S. E. Euskirchen; S. Drobot; U. C. Herzfeld; J. Maslanik; R. B. Lammers; M. A. Rawlins; C. J. Vorosmarty; T. S. Rupp; W. Wu; M. Calef

2008-06-01T23:59:59.000Z

418

The Arctic Ocean Response to the North Atlantic Oscillation  

Science Conference Proceedings (OSTI)

The climatically sensitive zone of the Arctic Ocean lies squarely within the domain of the North Atlantic oscillation (NAO), one of the most robust recurrent modes of atmospheric behavior. However, the specific response of the Arctic to annual ...

R. R. Dickson; T. J. Osborn; J. W. Hurrell; J. Meincke; J. Blindheim; B. Adlandsvik; T. Vinje; G. Alekseev; W. Maslowski

2000-08-01T23:59:59.000Z

419

Recent Great Lakes Ice Trends  

Science Conference Proceedings (OSTI)

Analysis of ice observations made by cooperative observers from shoreline stations reveals significant changes in the ice season on the North American Great Lakes over the past 35years. Although the dataset is highly inhomogeneous and year-to-...

Howard P. Hanson; Claire S. Hanson; Brenda H. Yoo

1992-05-01T23:59:59.000Z

420

ARM - Measurement - Ice water content  

NLE Websites -- All DOE Office Websites (Extended Search)

to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Ice water content The concentration (massvol) of ice water particles in a cloud....

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Dry Ice vs. Pipette Experiment Description  

E-Print Network (OSTI)

Dry Ice vs. Pipette Experiment Description Dry ice (solid) is put into the bulb of a pipette, plastic pipette 1 ice cube sized piece of dry ice Butter knife (or some object to break dry ice) Gloves (surgical gloves will not work, they must protect hands from dry ice) Safety glasses for demonstrator

422

Ice maker safety control  

Science Conference Proceedings (OSTI)

In a refrigeration apparatus including an evaporator, a defrost heater for defrosting the evaporator, a defrost thermostat having a switch for de-energizing the defrost heater at a preselected high temperature of the evaporator, and an ice making apparatus having a mold, a mold heater, and a control circuit controllably energized the mold heater, a safety control for the ice making apparatus is described comprising: means for thermally coupling the defrost thermostat with the mold; and means electrically connecting the defrost thermostat switch with the control circuit for de-energizing the mold heater at a preselected high temperature of the mold to prevent overheating thereof.

Linstromberg, W.J.

1988-05-03T23:59:59.000Z

423

Simulating Future Changes in Arctic and Subarctic Vegetation  

Science Conference Proceedings (OSTI)

The Arctic is a sensitive system undergoing dramatic changes related to recent warming trends. Vegetation dynamics—increases in the quantity of green vegetation and a northward migration of trees into the arctic tundra—are a component of ... Keywords: Arctic, biogeography, boreal forest, climate change, forest migration, shrub encroachment, subarctic, tundra, vegetation dynamics models

Howard E. Epstein; Jed O. Kaplan; Heike Lischke; Qin Yu

2007-07-01T23:59:59.000Z

424

Sensitivity of Ice Storms in the Southeastern United States to Atlantic SST—Insights from a Case Study of the December 2002 Storm  

Science Conference Proceedings (OSTI)

Meteorological observations and model simulations are used to show that the catastrophic ice storm of 4–5 December 2002 in the southeastern United States resulted from the combination of a classic winter storm and a warm sea surface temperature (...

Renato Ramos da Silva; Gil Bohrer; David Werth; Martin J. Otte; Roni Avissar

2006-05-01T23:59:59.000Z

425

Ice–Ice Collisions: An Ice Multiplication Process in Atmospheric Clouds  

Science Conference Proceedings (OSTI)

Ice in atmospheric clouds undergoes complex physical processes, interacting especially with radiation, which leads to serious impacts on global climate. After their primary production, atmospheric ice crystals multiply extensively by secondary ...

J.-I. Yano; V. T. J. Phillips

2011-02-01T23:59:59.000Z

426

Intercomparison of cloud model simulations of Arctic mixed-phase boundary layer clouds observed during SHEBA/FIRE-ACE  

SciTech Connect

An intercomparison of six cloud-resolving and large-eddy simulation models is presented. This case study is based on observations of a persistent mixed-phase boundary layer cloud gathered on 7 May, 1998 from the Surface Heat Budget of Arctic Ocean (SHEBA) and First ISCCP Regional Experiment - Arctic Cloud Experiment (FIRE-ACE). Ice nucleation is constrained in the simulations in a way that holds the ice crystal concentration approximately fixed, with two sets of sensitivity runs in addition to the baseline simulations utilizing different specified ice nucleus (IN) concentrations. All of the baseline and sensitivity simulations group into two distinct quasi-steady states associated with either persistent mixed-phase clouds or all-ice clouds after the first few hours of integration, implying the existence of multiple equilibria. These two states are associated with distinctly different microphysical, thermodynamic, and radiative characteristics. Most but not all of the models produce a persistent mixed-phase cloud qualitatively similar to observations using the baseline IN/crystal concentration, while small increases in the IN/crystal concentration generally lead to rapid glaciation and conversion to the all-ice state. Budget analysis indicates that larger ice deposition rates associated with increased IN/crystal concentrations have a limited direct impact on dissipation of liquid in these simulations. However, the impact of increased ice deposition is greatly enhanced by several interaction pathways that lead to an increased surface precipitation flux, weaker cloud top radiative cooling and cloud dynamics, and reduced vertical mixing, promoting rapid glaciation of the mixed-phase cloud for deposition rates in the cloud layer greater than about 1-2x10-5 g kg-1 s-1. These results indicate the critical importance of precipitation-radiative-dynamical interactions in simulating cloud phase, which have been neglected in previous fixed-dynamical parcel studies of the cloud phase parameter space. Large sensitivity to the IN/crystal concentration also suggests the need for improved understanding of ice nucleation and its parameterization in models.

Morrison, H.; Zuidema, Paquita; Ackerman, Andrew; Avramov, Alexander; de Boer, Gijs; Fan, Jiwen; Fridlind, Ann; Hashino, Tempei; Harrington, Jerry Y.; Luo, Yali; Ovchinnikov, Mikhail; Shipway, Ben

2011-06-16T23:59:59.000Z

427

An Initial Intercomparison of Atmospheric and Oceanic Climatology for the ICE-5G and ICE-4G Models of LGM Paleotopography  

Science Conference Proceedings (OSTI)

This paper investigates the impact of the new ICE-5G paleotopography dataset for Last Glacial Maximum (LGM) conditions on a coupled model simulation of the thermal and dynamical state of the glacial atmosphere and on both land surface and sea ...

F. Justino; A. Timmermann; U. Merkel; W. R. Peltier

2006-01-01T23:59:59.000Z

428

THE SPITZER ICE LEGACY: ICE EVOLUTION FROM CORES TO PROTOSTARS  

Science Conference Proceedings (OSTI)

Ices regulate much of the chemistry during star formation and account for up to 80% of the available oxygen and carbon. In this paper, we use the Spitzer c2d Legacy ice survey, complimented with data sets on ices in cloud cores and high-mass protostars, to determine standard ice abundances and to present a coherent picture of the evolution of ices during low- and high-mass star formation. The median ice composition H{sub 2}O:CO:CO{sub 2}:CH{sub 3}OH:NH{sub 3}:CH{sub 4}:XCN is 100:29:29:3:5:5:0.3 and 100:13:13:4:5:2:0.6 toward low- and high-mass protostars, respectively, and 100:31:38:4:-:-:- in cloud cores. In the low-mass sample, the ice abundances with respect to H{sub 2}O of CH{sub 4}, NH{sub 3}, and the component of CO{sub 2} mixed with H{sub 2}O typically vary by ice components, XCN, and CH{sub 3}OH vary by factors 2-10 between the lower and upper quartile. The XCN band correlates with CO, consistent with its OCN{sup -} identification. The origin(s) of the different levels of ice abundance variations are constrained by comparing ice inventories toward different types of protostars and background stars, through ice mapping, analysis of cloud-to-cloud variations, and ice (anti-)correlations. Based on the analysis, the first ice formation phase is driven by hydrogenation of atoms, which results in an H{sub 2}O-dominated ice. At later prestellar times, CO freezes out and variations in CO freezeout levels and the subsequent CO-based chemistry can explain most of the observed ice abundance variations. The last important ice evolution stage is thermal and UV processing around protostars, resulting in CO desorption, ice segregation, and the formation of complex organic molecules. The distribution of cometary ice abundances is consistent with the idea that most cometary ices have a protostellar origin.

Oeberg, Karin I. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02139 (United States); Boogert, A. C. Adwin [IPAC, NASA Herschel Science Center, California Institute of Technology, Pasadena, CA 91125 (United States); Pontoppidan, Klaus M. [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Van den Broek, Saskia; Van Dishoeck, Ewine F. [Leiden Observatory, Leiden University, 2300 RA Leiden (Netherlands); Bottinelli, Sandrine [Centre d'Etude Spatiale des Rayonnements (CESR), CNRS-UMR 5187, 31028 Toulouse Cedex 4 (France); Blake, Geoffrey A. [California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA 91125 (United States); Evans, Neal J. [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)

2011-10-20T23:59:59.000Z

429

Wind Effects on Past and Future Regional Sea Level Trends in the Southern Indo-Pacific  

Science Conference Proceedings (OSTI)

Global sea level rise due to the thermal expansion of the warming oceans and freshwater input from melting glaciers and ice sheets is threatening to inundate low-lying islands and coastlines worldwide. At present the global mean sea level rises ...

Axel Timmermann; Shayne McGregor; Fei-Fei Jin

2010-08-01T23:59:59.000Z

430

Hail ice impact on composite structures at glancing angles  

E-Print Network (OSTI)

investigation of high velocity ice impacts on woven carbon/and ice sphere. .by trailing ice fragments. ..

Funai, Sho

2012-01-01T23:59:59.000Z

431

Arctic Methane, Hydrates, and Global Climate  

NLE Websites -- All DOE Office Websites (Extended Search)

Arctic Methane, Hydrates, and Global Climate Arctic Methane, Hydrates, and Global Climate Speaker(s): Matthew T. Reagan Date: March 17, 2010 - 12:00pm Location: 90-3122 Paleooceanographic evidence has been used to postulate that methane may have had a significant role in regulating past climate. However, the behavior of contemporary permafrost deposits and oceanic methane hydrate deposits subjected to rapid temperature changes, like those now occurring in the arctic and those predicted under future climate change scenarios, has only recently been investigated. A recent expedition to the west coast of Spitsbergen discovered substantial methane gas plumes exiting the seafloor at depths that correspond to the upper limit of the receding gas hydrate stability zone. It has been suggested that these plumes may be the

432

Twentieth-Century Global-Mean Sea Level Rise: Is the Whole Greater than the Sum of the Parts?  

Science Conference Proceedings (OSTI)

Confidence in projections of global-mean sea level rise (GMSLR) depends on an ability to account for GMSLR during the twentieth century. There are contributions from ocean thermal expansion, mass loss from glaciers and ice sheets, groundwater ...

J. M. Gregory; N. J. White; J. A. Church; M. F. P. Bierkens; J. E. Box; M. R. van den Broeke; J. G. Cogley; X. Fettweis; E. Hanna; P. Huybrechts; L. F. Konikow; P. W. Leclercq; B. Marzeion; J. Oerlemans; M. E. Tamisiea; Y. Wada; L. M. Wake; R. S. W. van de Wal

2013-07-01T23:59:59.000Z

433

The Arctic and Subarctic Ocean Flux of Potential Vorticity and the Arctic Ocean Circulation  

Science Conference Proceedings (OSTI)

According to observations, the Arctic Ocean circulation beneath a shallow thermocline can be schematized by cyclonic rim currents along shelves and over ridges. In each deep basin, the circulation is also believed to be cyclonic. This circulation ...

Jiayan Yang

2005-12-01T23:59:59.000Z

434

Surface Melting over Ice Shelves and Ice Sheets as Assessed from Modeled Surface Air Temperatures  

Science Conference Proceedings (OSTI)

Summer surface melting plays an important role in the evolution of ice shelves and their progenitor ice sheets. To explore the magnitude of surface melt occurring over modern ice shelves and ice sheets in a climate scenario forced by ...

Jeremy G. Fyke; Lionel Carter; Andrew Mackintosh; Andrew J. Weaver; Katrin J. Meissner

2010-04-01T23:59:59.000Z

435

Image Content Engine (ICE)  

SciTech Connect

The Image Content Engine (ICE) is being developed to provide cueing assistance to human image analysts faced with increasingly large and intractable amounts of image data. The ICE architecture includes user configurable feature extraction pipelines which produce intermediate feature vector and match surface files which can then be accessed by interactive relational queries. Application of the feature extraction algorithms to large collections of images may be extremely time consuming and is launched as a batch job on a Linux cluster. The query interface accesses only the intermediate files and returns candidate hits nearly instantaneously. Queries may be posed for individual objects or collections. The query interface prompts the user for feedback, and applies relevance feedback algorithms to revise the feature vector weighting and focus on relevant search results. Examples of feature extraction and both model-based and search-by-example queries are presented.

Brase, J M

2007-03-26T23:59:59.000Z

436

The Spitzer ice legacy: Ice evolution from cores to protostars  

E-Print Network (OSTI)

Ices regulate much of the chemistry during star formation and account for up to 80% of the available oxygen and carbon. In this paper, we use the Spitzer c2d ice survey, complimented with data sets on ices in cloud cores and high-mass protostars, to determine standard ice abundances and to present a coherent picture of the evolution of ices during low- and high-mass star formation. The median ice composition H2O:CO:CO2:CH3OH:NH3:CH4:XCN is 100:29:29:3:5:5:0.3 and 100:13:13:4:5:2:0.6 toward low- and high-mass protostars, respectively, and 100:31:38:4:-:-:- in cloud cores. In the low-mass sample, the ice abundances with respect to H2O of CH4, NH3, and the component of CO2 mixed with H2O typically vary by ice components, XCN and CH3OH vary by factors 2-10 between the lower and upper quartile. The XCN band correlates with CO, consistent with its OCN- identification. The origin(s) of the different levels of ice abundance variations are cons...

Oberg, Karin I; Pontoppidan, Klaus M; Broek, Saskia van den; van Dishoeck, Ewine F; Bottinelli, Sandrine; Blake, Geoffrey A; Evans, Neal J

2011-01-01T23:59:59.000Z

437

Ice slurry cooling research: Storage tank ice agglomeration and extraction  

DOE Green Energy (OSTI)

A new facility has been built to conduct research and development on important issues related to implementing ice slurry cooling technology. Ongoing studies are generating important information on the factors that influence ice particle agglomeration in ice slurry storage tanks. The studies are also addressing the development of methods to minimize and monitor agglomeration and improve the efficiency and controllability of tank extraction of slurry for distribution to cooling loads. These engineering issues impede the utilization of the ice slurry cooling concept that has been under development by various groups.

Kasza, K. [Argonne National Lab., IL (United States); Hayashi, Kanetoshi [NKK Corp., Kawasaki (Japan)

1999-08-01T23:59:59.000Z

438

The FGGE Arctic Data Buoy Program  

Science Conference Proceedings (OSTI)

An array of about 20 drifting data buoys was established in the Arctic Ocean during the early months of 1979. The position of each buoy and the surface pressure and temperature are measured several times daily. The program expands our capability ...

A. S. Thorndike

1980-12-01T23:59:59.000Z

439

NOAAINMFS Developments Arctic Marine Research Contracts Awarded  

E-Print Network (OSTI)

on tunal porpoise, and the economic and biolog- August 1977 pacts of gas and oil exploration pre- dict the probable ecological impacts of oil and gas development on Alaska's outer continental mammals, and birds, and smaller organisms which oc- cupy the two Arctic coastal areas prior to oil and gas

440

Greenland Ice Sheet Surface Mass-Balance Modeling in a 131-Yr Perspective, 1950–2080  

Science Conference Proceedings (OSTI)

Fluctuations in the Greenland ice sheet (GrIS) surface mass balance (SMB) and freshwater influx to the surrounding oceans closely follow climate fluctuations and are of considerable importance to the global eustatic sea level rise. A state-of-the-...

Sebastian H. Mernild; Glen E. Liston; Christopher A. Hiemstra; Jens H. Christensen

2010-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Climate Impacts of Ice Nucleation  

SciTech Connect

Several different ice nucleation parameterizations in two different General Circulation Models are used to understand the effects of ice nucleation on the mean climate state, and the climate effect of aerosol perturbations to ice clouds. The simulations have different ice microphysical states that are consistent with the spread of observations. These different states occur from different parameterizations of the ice cloud nucleation processes, and feature different balances of homogeneous and heterogeneous nucleation. At reasonable efficiencies, consistent with laboratory measurements and constrained by the global radiative balance, black carbon has a small (-0.06 Wm?2) and not statistically significant climate effect. Indirect effects of anthropogenic aerosols on cirrus clouds occur mostly due to increases in homogeneous nucleation fraction as a consequence of anthropogenic sulfur emissions. The resulting ice indirect effects do not seem strongly dependent on the ice micro-physical balance, but are slightly larger for those states with less homogeneous nucleation in the base state. The total ice AIE is estimated at 0.26±0.09 Wm?2 (1? uncertainty). This represents an offset of 20-30% of the simulated total Aerosol Indirect Effect for ice and liquid clouds.

Gettelman, A.; Liu, Xiaohong; Barahona, Donifan; Lohmann, U.; Chen, Chih-Chieh

2012-10-19T23:59:59.000Z

442

Backhand tecniques in ice hockey.  

E-Print Network (OSTI)

??The main objective of this project based multimedia thesis is to show video material of how to use a backhand side of the ice hockey… (more)

Luoma, Matti

2012-01-01T23:59:59.000Z

443

Modeling of Ice Accretion on Wires  

Science Conference Proceedings (OSTI)

A time-dependent numerical model of ice accretion on wires, such as overhead conductors, is presented. Simulations of atmospheric icing are made with the model in order to examine the dependence of the accreted ice amount on atmospheric ...

Lasse Makkonen

1984-06-01T23:59:59.000Z

444

ICE Raids: Compounding Production, Contradiction, and Capitalism  

E-Print Network (OSTI)

is just a cheap way of boosting ICE ‘criminal alien’ arrestRegardless of whether or not ICE is motivated by maintainingWorkers in America: Factories and ICE Raids Produce Citizens

Reas, Elizabeth I

2009-01-01T23:59:59.000Z

445

Session Papers North Slope of Alaska and Adjacent Arctic Ocean...  

NLE Websites -- All DOE Office Websites (Extended Search)

over the NSAAAO throughout the year, it is well positioned to address these issues. Ice Phase Clouds Ice phase clouds are important globally, not just regionally. However, at...

446

BISICLES Captures Details of Retreating Antarctic Ice  

NLE Websites -- All DOE Office Websites (Extended Search)

BISICLES Captures Details of Retreating Antarctic Ice BISICLES Captures Details of Retreating Antarctic Ice March 30, 2013 | Tags: Climate Research, Hopper, Math & Computer Science...

447

Home Atmosphere Sea Ice Ocean Land Greenland Biology , J. Cappelen  

E-Print Network (OSTI)

and Drouilhet 1994) and given the fact that mid-stratospheric anomalies tend to mirror lower troposapheric Meteorological Institute, Tech. Rep. 07-06, 53 pp. Christy, J. R., and S. J. Drouilhet, 1994: Variability

Box, Jason E.

448

A Model for the Prediction of Initial Sea Ice Formation  

Science Conference Proceedings (OSTI)

Procedures are designed to calculate the net heat input at the air-water interface and the response of the oceanic mixed layer from summer to freeze-up. Sensible and latent heating are computed from the generalized similarity theory of Yamada (...

Maurice Danard; Mark Gray; Goz Lyv

1983-08-01T23:59:59.000Z

449

Theory of amorphous ices  

E-Print Network (OSTI)

We use large-deviation theory to study nonequilibrium transitions between amorphous solids and liquid in an atomistic model of supercooled water. Along with nonequilibrium transitions between the ergodic liquid and two distinct amorphous solids, we establish coexistence between the two amorphous solids, a finding that is consistent with experiment. The phase diagram we predict includes a nonequilibrium triple point where the two amorphous phases and the liquid coexist. While the amorphous solids are long-lived and slowly-aging glasses, their melting leads quickly to the formation of ice. This irreversible behavior is demonstrated in our theoretical treatment and compared with experiment.

David T Limmer; David Chandler

2013-06-20T23:59:59.000Z

450

Dynamics of ice shelf rift propagation and iceberg calving inferred from geodetic and seismic observations  

E-Print Network (OSTI)

2. Ice Shelves . . . . . . . . . . . . . . . . .5. Ice Rheology . . . . . . . . . . . . . 6.vi Calving Glaciers and Ice

Bassis, Jeremy N.

2007-01-01T23:59:59.000Z

451

Polyethylene Pipe Failure in the Arctic - Programmaster.org  

Science Conference Proceedings (OSTI)

In the current study, a new high density polyethylene (HDPE) pipe in the Arctic region of ... Heat Tint Effects on General Corrosion Resistance of Stainless Steels .

452

Potential Oil Production from the Coastal Plain of the Arctic...  

U.S. Energy Information Administration (EIA) Indexed Site

2. Analysis Discussion Resource Assessment The USGS most recent assessment of oil and gas resources of ANWR Coastal Plain (The Oil and Gas Resource Potential of the Arctic...

453

Potential Oil Production from the Coastal Plain of the Arctic...  

U.S. Energy Information Administration (EIA) Indexed Site

Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated Assessment Glossary ANILCA: Alaska National Interest Lands Conservation Act ANS:...

454

turner_poster.arctic_bbhrp.ppt  

NLE Websites -- All DOE Office Websites (Extended Search)

into different classes: "single-layer" and "double-layer" clouds of liquid-only, mixed-phase, and ice-only clouds. * A cloud layer is a vertically continuous region of the...

455

ARM - Measurement - Cloud ice particle  

NLE Websites -- All DOE Office Websites (Extended Search)

ice particle ice particle ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud ice particle Particles made of ice found in clouds. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments MET : Surface Meteorological Instrumentation Field Campaign Instruments REPLICATOR : Balloon-borne Ice Crystal Replicator CPI : Cloud Particle Imager CVI-AIR : Counterflow Virtual Impactor LEARJET : Lear Jet PARTIMG : Particle imager UAV-PROTEUS-MICRO : Proteus Cloud Microphysics Instruments

456

Intercomparison of model simulations of mixed-phase clouds observed during the ARM Mixed-Phase Arctic Cloud Experiment. Part II: Multi-layered cloud  

SciTech Connect

Results are presented from an intercomparison of single-column and cloud-resolving model simulations of a deep, multi-layered, mixed-phase cloud system observed during the ARM Mixed-Phase Arctic Cloud Experiment. This cloud system was associated with strong surface turbulent sensible and latent heat fluxes as cold air flowed over the open Arctic Ocean, combined with a low pressure system that supplied moisture at mid-level. The simulations, performed by 13 single-column and 4 cloud-resolving models, generally overestimate the liquid water path and strongly underestimate the ice water path, although there is a large spread among the models. This finding is in contrast with results for the single-layer, low-level mixed-phase stratocumulus case in Part I of this study, as well as previous studies of shallow mixed-phase Arctic clouds, that showed an underprediction of liquid water path. The overestimate of liquid water path and underestimate of ice water path occur primarily when deeper mixed-phase clouds extending into the mid-troposphere were observed. These results suggest important differences in the ability of models to simulate Arctic mixed-phase clouds that are deep and multi-layered versus shallow and single-layered. In general, models with a more sophisticated, two-moment treatment of the cloud microphysics produce a somewhat smaller liquid water path that is closer to observations. The cloud-resolving models tend to produce a larger cloud fraction than the single-column models. The liquid water path and especially the cloud fraction have a large impact on the cloud radiative forcing at the surface, which is dominated by the longwave flux for this case.

Morrison, H; McCoy, R B; Klein, S A; Xie, S; Luo, Y; Avramov, A; Chen, M; Cole, J; Falk, M; Foster, M; Genio, A D; Harrington, J; Hoose, C; Khairoutdinov, M; Larson, V; Liu, X; McFarquhar, G; Poellot, M; Shipway, B; Shupe, M; Sud, Y; Turner, D; Veron, D; Walker, G; Wang, Z; Wolf, A; Xu, K; Yang, F; Zhang, G

2008-02-27T23:59:59.000Z

457

Passive solar roof ice melter  

Science Conference Proceedings (OSTI)

An elongated passive solar roof ice melter is placed on top of accumulated ice and snow including an ice dam along the lower edge of a roof of a heated building and is held against longitudinal movement with respect to itself. The melter includes a bottom wall having an upper surface highly absorbent to radiant solar energy; a first window situated at right angles with respect to the bottom wall, and a reflecting wall connecting the opposite side edges of the bottom wall and the first window. The reflecting wall has a surface facing the bottom wall and the window which is highly reflective to radiant solar energy. Radiant solar energy passes through the first window and either strikes the highly absorbent upper surface of the bottom wall or first strikes the reflecting wall to be reflected down to the upper surface of the bottom wall. The heat generated thereby melts through the ice below the bottom wall causing the ice dam to be removed between the bottom wall and the top of the roof and immediately adjacent to the ice melter along the roof. Water dammed up by the ice dam can then flow down through this break in the dam and drain out harmlessly onto the ground. This prevents dammed water from seeping back under the shingles and into the house to damage the interior of the house.

Deutz, R.T.

1981-09-29T23:59:59.000Z

458

Semantic-based web service discovery and chaining for building an Arctic spatial data infrastructure  

Science Conference Proceedings (OSTI)

Increasing interests in a global environment and climate change have led to studies focused on the changes in the multinational Arctic region. To facilitate Arctic research, a spatial data infrastructure (SDI), where Arctic data, information, and services ... Keywords: Arctic, Crawler, Hydrology, Knowledge base, Ontology, SDI, Semantic, Service chain

W. Li; C. Yang; D. Nebert; R. Raskin; P. Houser; H. Wu; Z. Li

2011-11-01T23:59:59.000Z

459

Reconstruction of a high-resolution late holocene arctic paleoclimate record from Colville River delta sediments.  

SciTech Connect

This work was partially supported by the Sandia National Laboratories,Laboratory Directed Research and Development' (LDRD) fellowship program in conjunction with Texas A&M University (TAMU). The research described herein is the work of Kathryn M. Schreiner (Katie') and her advisor, Thomas S. Bianchi and represents a concise description of Katie's dissertation that was submitted to the TAMU Office of Graduate Studies in May 2013 in partial fulfillment of her doctorate of philosophy degree. High Arctic permafrost soils contain a massive amount of organic carbon, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This project investigated long term, fine scale particulate organic carbon (POC) delivery by the high-Arctic Colville River into Simpson's Lagoon in the near-shore Beaufort Sea. Modern POC was determined to be a mixture of three sources (riverine soils, coastal erosion, and marine). Downcore POC measurements were performed in a core close to the Colville River output and a core close to intense coastal erosion. Inputs of the three major sources were found to vary throughout the last two millennia, and in the Colville River core covary significantly with Alaskan temperature reconstructions.

Schreiner, Kathryn Melissa; Lowry, Thomas Stephen

2013-10-01T23:59:59.000Z

460

Reconstruction of a high-resolution late holocene arctic paleoclimate record from Colville River delta sediments.  

Science Conference Proceedings (OSTI)

This work was partially supported by the Sandia National Laboratories,Laboratory Directed Research and Development' (LDRD) fellowship program in conjunction with Texas A&M University (TAMU). The research described herein is the work of Kathryn M. Schreiner (Katie') and her advisor, Thomas S. Bianchi and represents a concise description of Katie's dissertation that was submitted to the TAMU Office of Graduate Studies in May 2013 in partial fulfillment of her doctorate of philosophy degree. High Arctic permafrost soils contain a massive amount of organic carbon, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This project investigated long term, fine scale particulate organic carbon (POC) delivery by the high-Arctic Colville River into Simpson's Lagoon in the near-shore Beaufort Sea. Modern POC was determined to be a mixture of three sources (riverine soils, coastal erosion, and marine). Downcore POC measurements were performed in a core close to the Colville River output and a core close to intense coastal erosion. Inputs of the three major sources were found to vary throughout the last two millennia, and in the Colville River core covary significantly with Alaskan temperature reconstructions.

Schreiner, Kathryn Melissa; Lowry, Thomas Stephen

2013-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Ice_slurry_fact_sheet  

NLE Websites -- All DOE Office Websites (Extended Search)

new approach to saving stroke and cardiac arrest victims by using a specially engineered ice slurry to cool organs. The technology is also being investigated as a way to improve...

462

Method of forming clathrate ice  

DOE Patents (OSTI)

A method of forming clathrate ice in a supercooled water-based liquid contained in a vessel is disclosed. Initially, an oscillator device is located in the liquid in the vessel. The oscillator device is then oscillated ultrasonically so that small crystals are formed in the liquid. These small crystals serve as seed crystals for ice formation in the liquid and thereby prevent supercooling of the liquid. Preferably, the oscillating device is controlled by a thermostat which initiates operation of the oscillator device when the temperature of the liquid is lowered to the freezing point. Thereafter, the operation of the oscillator device is terminated when ice is sensed in the liquid by an ice sensor.

Hino, Toshiyuki (Tokyo, JP); Gorski, Anthony J. (Lemont, IL)

1987-01-01T23:59:59.000Z

463

Method of forming calthrate ice  

DOE Patents (OSTI)

A method of forming clathrate ice in a supercooled water-based liquid contained in a vessel is disclosed. Initially, an oscillator device is located in the liquid in the vessel. The oscillator device is then oscillated ultransonically so that small crystals are formed in the liquid. Thes small crystals serve as seed crystals for ice formation in the liquid and thereby prevent supercooling of the liquid. Preferably, the oscillating device is controlled by a thermostat which initiates operation of the oscillator device when the temperature of the liquid is lowered to the freezing point. Thereafter, the operation of the oscillator device is terminated when ice is sensed in the liquid by an ice sensor.

Hino, T.; Gorski, A.J.

1985-09-30T23:59:59.000Z

464

Melting of Ice under Pressure  

SciTech Connect

The melting of ice under pressure is investigated with a series of first principles molecular dynamics simulations. In particular, a two-phase approach is used to determine the melting temperature of the ice-VII phase in the range of 10 to 50 GPa. Our computed melting temperatures are consistent with existing diamond anvil cell experiments. We find that for pressures between 10 to 40 GPa, ice melts as a molecular solid. For pressures above {approx}45 GPa there is a sharp increase in the slope of the melting curve due to the presence of molecular dissociation and proton diffusion in the solid, prior to melting. The onset of significant proton diffusion in ice-VII as a function of increasing temperature is found to be gradual and bears many similarities to that of a type-II superionic solid.

Schwegler, E; Sharma, M; Gygi, F; Galli, G

2008-07-31T23:59:59.000Z

465

An Inverse Method for Tracking Ice Motion in the Marginal Ice Zone Using Sequential Satellite Images  

Science Conference Proceedings (OSTI)

A new method for tracking ice motion and estimating ocean surface currents from sequential satellite images is presented. It is particularly suited for the marginal ice zone. A simple ice advection model, driven by wind and surface currents, is ...

Mark Buehner; Keith R. Thompson; Ingrid Peterson

1997-12-01T23:59:59.000Z

466

Did the Arctic Ice Recover? Demographics of True and False Climate Facts  

Science Conference Proceedings (OSTI)

Beliefs about climate change divide the U.S. public along party lines more distinctly than hot social issues. Research finds that better-educated or informed respondents are more likely to align with their parties on climate change. This ...

Lawrence C. Hamilton

2012-10-01T23:59:59.000Z

467

Multimodel Combination by a Bayesian Hierarchical Model: Assessment of Ice Accumulation over the Oceanic Arctic Region  

Science Conference Proceedings (OSTI)

The performance of general circulation models (GCMs) varies across regions and periods. When projecting into the future, it is therefore not obvious whether to reject or to prefer a certain GCM. Combining the outputs of several GCMs may enhance ...

Malaak Kallache; Elena Maksimovich; Paul-Antoine Michelangeli; Philippe Naveau

2010-10-01T23:59:59.000Z

468

Effects of Surface Roughness and Surface Energy on Ice Adhesion ...  

Science Conference Proceedings (OSTI)

Ice adheres to steel surfaces when the environment temperature is low. In many cases, ice formation on surfaces is unwanted; therefore, anti-icing techniques ...

469

ICR-ICE Standard Operating Procedures | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ICR-ICE Standard Operating Procedures ICR-ICE Standard Operating Procedures ICE-ICR SOP.pdf More Documents & Publications External Independent Review (EIR) Standard Operating...

470

Improvements in Representations of Cloud Microphysics for BBHRP and Models using Data Collected during M-PACE and TWP-ICE  

SciTech Connect

In our research we proposed to use data collected during the 2004 Mixed-Phase Arctic Cloud Experiment (MPACE) and the 2006 Tropical Warm Pool International Cloud Experiment (TWP-ICE) to improve retrievals of ice and mixed-phase clouds, to improve our understanding of how cloud and radiative processes affect cloud life cycles, and to develop and test methods for using ARM data more effectively in model. In particular, we proposed to: 1) use MPACE in-situ data to determine how liquid water fraction and cloud ice and liquid effective radius (r{sub ei} and r{sub ew}) vary with temperature, normalized cloud altitude and other variables for Arctic mixed-phase clouds, and to use these data to evaluate the performance of model parameterization schemes and remote sensing retrieval algorithms; 2) calculate rei and size/shape distributions using TWP-ICE in-situ data, investigate their dependence on cirrus type (oceanic or continental anvils or cirrus not directly traced to convection), and develop and test representations for MICROBASE; 3) conduct fundamental research enhancing our understanding of cloud/radiative interactions, concentrating on effects of small crystals and particle shapes and sizes on radiation; and 4) improve representations of microphysical processes for models (fall-out, effective density, mean scattering properties, rei and rew) and provide them to ARM PIs. In the course of our research, we made substantial progress on all four goals.

Greg M. McFarquhar

2010-02-22T23:59:59.000Z

471

Ice structures, patterns, and processes: A view across the ice-fields  

E-Print Network (OSTI)

We look ahead from the frontiers of research on ice dynamics in its broadest sense; on the structures of ice, the patterns or morphologies it may assume, and the physical and chemical processes in which it is involved. We highlight open questions in the various fields of ice research in nature; ranging from terrestrial and oceanic ice on Earth, to ice in the atmosphere, to ice on other solar system bodies and in interstellar space.

Bartels-Rausch, Thorsten; Cartwright, Julyan H E; Escribano, Rafael; Finney, John L; Grothe, Hinrich; Gutiérrez, Pedro J; Haapala, Jari; Kuhs, Werner F; Pettersson, Jan B C; Price, Stephen D; Sainz-Díaz, C Ignacio; Stokes, Debbie J; Strazzulla, Giovanni; Thomson, Erik S; Trinks, Hauke; Uras-Aytemiz, Nevin; 10.1103/RevModPhys.84.885

2012-01-01T23:59:59.000Z

472

{open_quotes}Rosshelf{close_quotes} company and development of the Arctic Shelf of Russia  

Science Conference Proceedings (OSTI)

The Russian {open_quotes}Rosshelf{close_quotes} company for developing the shelf is the nucleus of a new branch of industry for developing oil and gas fields on shelves of Russia, primarily in the Arctic. {open_quotes}Rosshelf{close_quotes}, created on the basis of leading naval defence enterprises, Russia`s largest geological and mining enterprises, and territorial organizations managing the northern regions of Russia, obtained a license in March 1993 for the right to use the natural resources of Europe`s largest Shtokman gas-condensate field and Prirazlomnoe oil field in the Barents Sea and thus has all the conditions and possibilities for the successful organization of oil and gas production on the continental shelf of Russia. The goals of {open_quotes}Rosshelf{close_quotes} are: the production of oil and gas equipment at converted defence enterprises, including under foreign license and for export; the development of oil and gas fields on the continental shelf of Russia; the creation of new prospective technologies for offshore oil and gas production under conditions of the Russian and mainly the arctic shelf. {open_quotes}Rosshelf{close_quotes} should develop the Pechora Sea fields, mainly the Prirazlomnoe oil field with its relatively small depth and distance from the shore. It is planned to develop Europe`s largest Shtokman field at a distance of 600 km from the shore in the course of 10-12 years with expenditures of about $6 billion. The use of defence technologies underlying the activities of {open_quotes}Rosshelf{close_quotes} gives the company a real change to reach the world level of offshore oil- and gas-production technology. Broad cooperation with foreign companies, mainly in the area of engineering, finances, ecology, and safety, planned also for this. Calculations show that already the priority projects of {open_quotes}Rosshelf{close_quotes} will provide 250,000-300,000 highly skilled jobs at Russian defence enterprises.

Velikhov, E.P.

1994-09-01T23:59:59.000Z

473

Arctic Lower Troposphere Observed Structure (ALTOS)  

NLE Websites -- All DOE Office Websites (Extended Search)

Lower Troposphere Observed Structure (ALTOS) Lower Troposphere Observed Structure (ALTOS) will raise and lower a heavily instrumented tethered balloon system at regular intervals in the lower 2 kilometers of the atmosphere at Oliktok Point. Data obtained during the ALTOS campaign will provide a statistically significant set of observed in situ cloud properties for validating retrieval algorithms and help scientists reduce the uncertainty in the radiative forcing and heating rates on hourly time scales. The data will also help researchers gain a better understanding of the driving processes that control climate changes and determine the state of the Arctic climate system. Collaborators Science Team: The Pennsylvania State University, Stratton

474

Modeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern Baffin Bay  

Science Conference Proceedings (OSTI)

A high-resolution sea ice–ocean numerical model of the North Water polynya has been developed to study the wind-driven circulation during polynya events. An idealized three-layer stratified ocean is used to initialize the model to characterize ...

Dany Dumont; Yves Gratton; Todd E. Arbetter

2010-06-01T23:59:59.000Z

475

Ice Nuclei in Marine Air: Biogenic Particles or Dust?  

Science Conference Proceedings (OSTI)

Ice nuclei impact clouds, but their sources and distribution in the atmosphere are still not well known. Particularly little attention has been paid to IN sources in marine environments, although evidence from field studies suggests that IN populations in remote marine regions may be dominated by primary biogenic particles associated with sea spray. In this exploratory model study, we aim to bring attention to this long-neglected topic and identify promising target regions for future field campaigns. We assess the likely global distribution of marine biogenic ice nuclei using a combination of historical observations, satellite data and model output. By comparing simulated marine biogenic immersion IN distributions and dust immersion IN distributions, we predict strong regional differences in the importance of marine biogenic IN relative to dust IN. Our analysis suggests that marine biogenic IN are most likely to play a dominant role in determining IN concentrations in near-surface-air over the Southern Ocean, so future field campaigns aimed at investigating marine biogenic IN should target that region. Climate related changes in the abundance and emission of biogenic marine IN could affect marine cloud properties, thereby introducing previously unconsidered feedbacks that influence the hydrological cycle and the Earth’s energy balance. Furthermore, marine biogenic IN may be an important aspect to consider in proposals for marine cloud brightening by artificial sea spray production.

Burrows, Susannah M.; Hoose, C.; Poschl, U.; Lawrence, M.

2013-01-11T23:59:59.000Z

476

Western Arctic Shelfbreak Eddies: Formation and Transport  

Science Conference Proceedings (OSTI)

The mean structure and time-dependent behavior of the shelfbreak jet along the southern Beaufort Sea, and its ability to transport properties into the basin interior via eddies are explored using high-resolution mooring data and an idealized ...

Michael A. Spall; Robert S. Pickart; Paula S. Fratantoni; Albert J. Plueddemann

2008-08-01T23:59:59.000Z

477

Relative Dispersion of Ice Crystals in Seeded Cumuli  

Science Conference Proceedings (OSTI)

Relative dispersion of ice crystals was measured in 30 seeded cumulus clouds. A quasi-instantaneous, vertical area source of ice was generated by releasing dry-ice pellets from an airplane. The ice concentration distribution and relative ...

Jeffrey C. Weil; R. Paul Lawson; Alfred R. Rodi

1993-06-01T23:59:59.000Z

478

An Estimate of Increases in Storm Surge Risk to Property from Sea Level Rise in the First Half of the Twenty-First Century  

Science Conference Proceedings (OSTI)

Sea level is rising as the World Ocean warms and ice caps and glaciers melt. Published estimates based on data from satellite altimeters, beginning in late 1992, suggest that the global mean sea level has been rising on the order of 3 mm yr?1. ...

Ross N. Hoffman; Peter Dailey; Susanna Hopsch; Rui M. Ponte; Katherine Quinn; Emma M. Hill; Brian Zachry

2010-10-01T23:59:59.000Z

479

Ice Energy | Open Energy Information  

Open Energy Info (EERE)

Ice Energy Ice Energy Jump to: navigation, search Logo: Ice Energy Name Ice Energy Address 9351 Eastman Park Drive Place Windsor, Colorado Zip 80550 Sector Renewable energy Product Energy Storage Year founded 2003 Number of employees 51-200 Phone number 970-545-3630 Website http://www.ice-energy.com/ Coordinates 40.4651775°, -104.882° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.4651775,"lon":-104.882,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

480

Concept of the transport system in the western part of the Arctic  

Science Conference Proceedings (OSTI)

According to the concept of the energy policy of Russia under new economic conditions, the production of oil and gas condensate after a decline to 300-345 million tons/yr in 1997 will reach 370-400 million tons in 2010, and the export of oil and petroleum products, apart from countries of the CIS, will be 90-120 million tons/yr and of natural gas 130-140 billion m{sup 3}. The main sources of oil and gas production will be Volga region and Tyumen, Yamal, and Pechora-Nenets provinces. The most prospective oil and gas fields are located in an extensive territory north of the Arctic Circle and on the continental shelf of the Barnets and Kara Seas. The geographic location of the world`s richest fields of energy resources creates favorable conditions for their export to Northern Europe, northern states of the USA and Canada, and after developing direct sailing along the Northern Sea Route. According to preliminary data, the volume of export of oil and petroleum products in the next 10-15 years form this region can amount to 20-25 millions tons and delivery of supplies 1.5-2.0 million tons. Sea transport plays a substantial role in export shipments. In 1989, 98.0 Million tons of oil was unloaded through Black Sea and Baltic ports. The transport system should be reliable, ecologically safe, and cost-effective, should adapt well for providing the fields being developed on the continent and shelf with transport services, and should deliver oil and products to any importing country. With consideration of the complex; and importance of the problem, in the present concept the transport system in the stretch of domestic traffic is examined in there variants: variant 1 - {open_quotes}Island terminal,{close_quotes} variant 2 - {open_quotes}Oil trunk pipeline,{close_quotes} 3 - {open_quotes}Shore terminal.{close_quotes}

Parfenov, A.F.

1994-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "arctic sea ice" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Polar Cloud and Surface Classification Using AVHRR Imagery: An Intercomparison of Methods  

Science Conference Proceedings (OSTI)

Six Advanced Very High-Resolution Radiometer local area coverage (AVHPR LAC) arctic scenes are classified into ten classes. These include water, solid sea ice, broken sea ice, snow-covered mountains, snow-free land, and five cloud types. Three ...

R. M. Welch; S. K. Sengupta; A. K. Goroch; P. Rabindra; N. Rangaraj; M. S. Navar

1992-05-01T23:59:59.000Z

482

Ice Formation in Gas-Diffusion Layers  

E-Print Network (OSTI)

of California. Ice Formation in Gas-Diffusion Layers Thomasconditions, ice forms in the gas-diffusion layer (GDL) of areaction of reactant gases (1). A number of strategies exist

Dursch, Thomas

2013-01-01T23:59:59.000Z

483

Quantum Ice : a quantum Monte Carlo study  

E-Print Network (OSTI)

Ice states, in which frustrated interactions lead to a macroscopic ground-state degeneracy, occur in water ice, in problems of frustrated charge order on the pyrochlore lattice, and in the family of rare-earth magnets collectively known as spin ice. Of particular interest at the moment are "quantum spin ice" materials, where large quantum fluctuations may permit tunnelling between a macroscopic number of different classical ground states. Here we use zero-temperature quantum Monte Carlo simulations to show how such tunnelling can lift the degeneracy of a spin or charge ice, stabilising a unique "quantum ice" ground state --- a quantum liquid with excitations described by the Maxwell action of 3+1-dimensional quantum electrodynamics. We further identify a competing ordered "squiggle" state, and show how both squiggle and quantum ice states might be distinguished in neutron scattering experiments on a spin ice material.

Nic Shannon; Olga Sikora; Frank Pollmann; Karlo Penc; Peter Fulde

2011-05-20T23:59:59.000Z

484

Why Sequence Lake Vostok accretion ice?  

NLE Websites -- All DOE Office Websites (Extended Search)

Sequence Lake Vostok accretion ice? Lake Vostok is the largest known subglacial lake in central Antarctica, though it's been buried under 4 kilometers (nearly 2.5 miles) of ice for...

485

Microsoft Word - IceMountainFinal.docx  

NLE Websites -- All DOE Office Websites (Extended Search)

Tumbled-down boulders, called talus, on Ice Mountain's north- western slope collect ice during the winter. In the summer, cold air flows out of vents in the base of the talus,...

486

Icing Conditions Encountered by a Research Aircraft  

Science Conference Proceedings (OSTI)

The characteristics of clouds which have led to airframe icing on an instrumented Beechcraft Super King Air are summarized. The icing encounters occurred at altitudes from 0–8000 m MSL, in summer and winter, in stratiform and cumuliform clouds, ...

Wayne R. Sand; William A. Cooper; Marcia K. Politovich; Donald L. Veal

1984-10-01T23:59:59.000Z

487

Ice Crystal Replication with Common Plastic Solutions  

Science Conference Proceedings (OSTI)

Use of common plastics, i.e., polystyrene, Plexiglas (polymethyl methacrylate) and Lexan (polycarbonate), was investigated for ice crystal replication. The results suggest that all common plastics tested are usable for ice crystal replication ...

Tsuneya Takahashi; Norihiko Fukuta

1988-02-01T23:59:59.000Z

488

Airplane Instrument to Detect Ice Particles  

Science Conference Proceedings (OSTI)

A simple instrument that detects ice particles has been developed for use in airplane studies of thunderstorms. Although sophisticated instruments are available for imaging atmospheric ice particles, the spatial resolution of the particle ...

J. J. Jones; C. Grotbeck; B. Vonnegut

1989-08-01T23:59:59.000Z

489

Light Scattering by Single Natural Ice Crystals  

Science Conference Proceedings (OSTI)

During the South Pole Ice Crystal Experiment, angular scattering intensities (ASIs) of single ice crystals formed in natural conditions were measured for the first time with the polar nephelometer instrument. The microphysical properties of the ...

Valery Shcherbakov; Jean-François Gayet; Brad Baker; Paul Lawson

2006-05-01T23:59:59.000Z

490

Smoothed particle hydrodynamics non-Newtonian model for ice-sheet and ice-shelf dynamics  

Science Conference Proceedings (OSTI)

We propose a new three-dimensional smoothed particle hydrodynamics (SPH) non-Newtonian model to study coupled ice-sheet and ice-shelf dynamics. Most existing ice-sheet numerical models use grid-based Eulerian discretizations, and are usually restricted ... Keywords: Grounding line, Ice sheet, Non-Newtonian fluid, Smoothed particle hydrodynamics

W. Pan, A. M. Tartakovsky, J. J. Monaghan

2013-06-01T23:59:59.000Z

491

ICE™ and ICE/T™: tools to assist in compiler design and implementation  

Science Conference Proceedings (OSTI)

ICE (Intermediate Code Engine) and ICE/T (ICE/Translator) are compiler back ends that execute on a Java Virtual Machine (JVM). They allow the student to complete a working compiler quickly and can execute on any platform that supplies a JVM. ICE is a ... Keywords: back-end, compiler, project, translator

Truman Parks Boyer; Mohsen Chitsaz

2004-12-01T23:59:59.000Z

492

Gas isotopes in ice reveal a vegetated central Greenland during ice sheet invasion  

E-Print Network (OSTI)

on the ground surface as snow- drift and the ice sheet during a growing phase, with a mixing ratio of the localGas isotopes in ice reveal a vegetated central Greenland during ice sheet invasion R. Souchez,1 J prevailing during build-up of the Greenland Ice Sheet (GIS) are not yet established. Here we use results from

Chappellaz, Jérôme

493

Global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the Community  

E-Print Network (OSTI)

and supersaturation in CAM. The new model is able to reproduce field observations of ice mass and mixed phase cloudGlobal simulations of ice nucleation and ice supersaturation with an improved cloud scheme; accepted 3 June 2010; published 28 September 2010. [1] A processbased treatment of ice supersaturation

Gettelman, Andrew

494

ICE Solar | Open Energy Information  

Open Energy Info (EERE)

ICE Solar ICE Solar Jump to: navigation, search Name ICE Solar Place Hyderabad, Andhra Pradesh, India Sector Solar Product India-based company focused on solar PV engineering, procurement and construction opportunities. Coordinates 17.6726°, 77.5971° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":17.6726,"lon":77.5971,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

495

California Sea Grant 1 California Sea Grant  

E-Print Network (OSTI)

California Sea Grant 1 California Sea Grant Strategic Plan 2010­2013 #12;2 Strategic Plan 2010 Library: http://nsgl.gso.uri.edu. University of California CASG College Program 9500 Gilman Dr, Dept 0232)--CASG archives; p. 6 (left) --Carrie Pomeroy/SGEP; (right)--William Folsom, NMFS; SGEP archives; p. 7--California

Jaffe, Jules

496

Application in Advanced Laparoscopic Procedures: Medical Ice...  

NLE Websites -- All DOE Office Websites (Extended Search)

Applications Homeland Security Applications Biomedical Applications Medical Ice Slurry Coolants for Inducing Targeted-OrganTissue Protective Cooling Technology...

497

Nighttime Cloud Detection Over the Arctic Using AVHRR Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Detection Over the Arctic Cloud Detection Over the Arctic Using AVHRR Data D. A. Spangenberg, D. R. Doelling, and V. Chakrapani Analytical Services & Materials, Inc. Hampton, Virginia P. Minnis National Aeronautics and Space Administration Hampton, Virginia T. Uttal National Oceanic and Atmospheric Administration Boulder, Colorado Introduction Clouds play an important role in the Arctic energy budget. The magnitude and significance of the radiative impact of polar clouds, however, are not well known. Polar nocturnal clouds are often warmer or at the same temperature as the background snow surface, complicating cloud detection. Also, these clouds tend to be thin, with lower emittances than clouds occurring during the summer. Using only the infrared (IR) channels of satellite data to characterize cloud amount and distribution in the Arctic is

498

Potential Oil Production from the Coastal Plain of the Arctic...  

U.S. Energy Information Administration (EIA) Indexed Site

Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated Assessment 3. Summary The 1.5 million-acre coastal plain of the 19 million-acre...

499

Arctic Precipitation and Evaporation: Model Results and Observational Estimates  

Science Conference Proceedings (OSTI)

Observational estimates of precipitation and evaporation over the Arctic Ocean and its terrestrial watersheds are compared with corresponding values from the climate model simulations of the Atmospheric Model Intercomparison Project (AMIP). ...

John E. Walsh; Vladimir Kattsov; Diane Portis; Valentin Meleshko

1998-01-01T23:59:59.000Z

500

Arctic Tropospheric Winds Derived from TOVS Satellite Retrievals  

Science Conference Proceedings (OSTI)

Accurate three-dimensional wind fields are essential for diagnosing a variety of important climate processes in the Arctic, such as the advection and deposition of heat and moisture, changes in circulation features, and transport of trace ...

Jennifer A. Francis; Elias Hunter; Cheng-Zhi Zou

2005-07-01T23:59:59.000Z