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Note: This page contains sample records for the topic "research general circulation" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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1

Anomaly General Circulation Models  

Science Conference Proceedings (OSTI)

Anomally models based on a spectral general circulation model (GCM) are formulated and applied to study of low-frequency atmospheric variability in the extratropics, and long-range forecasting research. A steady linear version of the anomaly ...

A. Navarra; K. Miyakoda

1988-05-01T23:59:59.000Z

2

Ocean General Circulation Models  

SciTech Connect

1. Definition of Subject The purpose of this text is to provide an introduction to aspects of oceanic general circulation models (OGCMs), an important component of Climate System or Earth System Model (ESM). The role of the ocean in ESMs is described in Chapter XX (EDITOR: PLEASE FIND THE COUPLED CLIMATE or EARTH SYSTEM MODELING CHAPTERS). The emerging need for understanding the Earth’s climate system and especially projecting its future evolution has encouraged scientists to explore the dynamical, physical, and biogeochemical processes in the ocean. Understanding the role of these processes in the climate system is an interesting and challenging scientific subject. For example, a research question how much extra heat or CO2 generated by anthropogenic activities can be stored in the deep ocean is not only scientifically interesting but also important in projecting future climate of the earth. Thus, OGCMs have been developed and applied to investigate the various oceanic processes and their role in the climate system.

Yoon, Jin-Ho; Ma, Po-Lun

2012-09-30T23:59:59.000Z

3

1. TITLE OF PROPOSED RESEARCH: Performance Portability for Coupled AtmosphereOcean General Circulation Models  

E-Print Network (OSTI)

, Bldg. 6012 Oak Ridge, Tennessee 37831­6367 Phone : 423­574­3128 Fax : 423­574­0680 E­mail : worleyph@ornl, NCAR, and ORNL [6, 7]. This code uses an additional ``high level'' call structure or framework at ORNL. These resources are sufficient to begin the proposed research. We also expect to have access

4

The Seasonal Footprinting Mechanism in the CSIRO General Circulation Models  

Science Conference Proceedings (OSTI)

An influence of midlatitude atmospheric variability on interannual ENSO and decadal ENSO-like variability is established and investigated in the Commonwealth Scientific and Industrial Research Organisation (CSIRO) coupled general circulation ...

Daniel J. Vimont; David S. Battisti; Anthony C. Hirst

2003-08-01T23:59:59.000Z

5

Snow Hydrology in a General Circulation Model  

Science Conference Proceedings (OSTI)

A snow hydrology has been implemented in an atmospheric general circulation model (GCM). The snow hydrology consists of parameterizations of snowfall and snow cover fraction, a prognostic calculation of snow temperature, and a model of the snow ...

Susan Marshall; John O. Roads; Gary Glatzmaier

1994-08-01T23:59:59.000Z

6

A Spontaneously Generated Tropical Atmospheric General Circulation  

Science Conference Proceedings (OSTI)

A series of idealized atmospheric general circulation model (AGCM) experiments are presented. These experiments examine whether and how atmospheric deep moist convection, in the absence of meridional gradients in external forcing, interacts with ...

Ben P. Kirtman; Edwin K. Schneider

2000-07-01T23:59:59.000Z

7

General Circulation Statistics on Short Time Scales  

Science Conference Proceedings (OSTI)

The sensitivity of various zonal mean general circulation statistics to the choice of the averaging period used to define them is tested with upper-air data for the Northern Hemisphere taken from the NMC global analysis for the winter of 1976–77. ...

Richard D. Rosen; David A. Salstein

1982-07-01T23:59:59.000Z

8

Status of lost circulation research  

DOE Green Energy (OSTI)

This paper describes progress made in the Lost Circulation Technology Development Program over the period March, 1992--April, 1993. The program is sponsored at Sandia National Laboratories by the US Department of Energy, Geothermal division. The goal of the program is to develop technology to reduce lost circulation costs associated with geothermal drilling by 30--50%.

Glowka, D.A.; Schafer, D.M.; Wright, E.K.; Whitlow, G.L.; Bates, C.W.

1993-06-01T23:59:59.000Z

9

The Response of an Ocean General Circulation Model to Surface Wind Stress Produced by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Two surface wind stress datasets for 1979–91, one based on observations and the other from an integration of the COLA atmospheric general circulation model (AGCM) with prescribed SST, are used to drive the GFDL ocean general circulation model. ...

Bohua Huang; Edwin K. Schneider

1995-10-01T23:59:59.000Z

10

Global Climate and Ocean Circulation on an Aquaplanet Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

A low-resolution coupled ocean–atmosphere general circulation model (OAGCM) is used to study the characteristics of the large-scale ocean circulation and its climatic impacts in a series of global coupled aquaplanet experiments. Three ...

Robin S. Smith; Clotilde Dubois; Jochem Marotzke

2006-09-01T23:59:59.000Z

11

Evaluation of cirrus statistics produced by general circulation...  

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

produced by general circulation models using ARM data Hartsock, Daniel University of Utah Mace, Gerald University of Utah Benson, Sally University of Utah Category: Modeling Our...

12

Regional Climates in the GISS General Circulation Model: Surface Air Temperature  

Science Conference Proceedings (OSTI)

One of the more viable research techniques into global climate change for the purpose of understanding the consequent environmental impacts is based on the use of general circulation models (GCMs). However, GCMs are currently unable to reliably ...

Bruce Hewitson

1994-02-01T23:59:59.000Z

13

A General Circulation Experiment with a Coupled Atmosphere, Ocean and Sea Ice Model  

Science Conference Proceedings (OSTI)

This paper describes the construction and results of a comprehensive, three-dimensional general circulation model (GCM) of the earth's climate. The model, developed at the National Center for Atmospheric Research (NCAR), links separate existing ...

Warren M. Washington; Albert J. Semtner Jr.; Gerald A. Meehl; David J. Knight; Thomas A. Mayer

1980-12-01T23:59:59.000Z

14

[Treatment of cloud radiative effects in general circulation models  

SciTech Connect

This is a renewal proposal for an on-going project of the Department of Energy (DOE)/Atmospheric Radiation Measurement (ARM) Program. The objective of the ARM Program is to improve the treatment of radiation-cloud in GCMs so that reliable predictions of the timing and magnitude of greenhouse gas-induced global warming and regional responses can be made. The ARM Program supports two research areas: (I) The modeling and analysis of data related to the parameterization of clouds and radiation in general circulation models (GCMs); and (II) the development of advanced instrumentation for both mapping the three-dimensional structure of the atmosphere and high accuracy/precision radiometric observations. The present project conducts research in area (I) and focuses on GCM treatment of cloud life cycle, optical properties, and vertical overlapping. The project has two tasks: (1) Development and Refinement of GCM Radiation-Cloud Treatment Using ARM Data; and (2) Validation of GCM Radiation-Cloud Treatment.

Wang, W.C.

1993-11-01T23:59:59.000Z

15

Arctic and Antarctic Climatology of a GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

The performance of a recent version of the general circulation model used at the Goddard Laboratory for Atmospheric Science is evaluated with particular emphasis on its behavior at high latitudes of the Northern and Southern Hemispheres. A ...

G. F. Herman; W. T. Johnson

1980-12-01T23:59:59.000Z

16

On the Wind Power Input to the Ocean General Circulation  

Science Conference Proceedings (OSTI)

The wind power input to the ocean general circulation is usually calculated from the time-averaged wind products. Here, this wind power input is reexamined using available observations, focusing on the role of the synoptically varying wind. Power ...

Xiaoming Zhai; Helen L. Johnson; David P. Marshall; Carl Wunsch

2012-08-01T23:59:59.000Z

17

A Martian General Circulation Experiment with Large Topography  

Science Conference Proceedings (OSTI)

A three-layer general circulation model, used to simulate the Martian atmosphere, is described and results are presented. The model assumes a dust-free pure C02 atmosphere and allows for a diurnally- varying convective boundary layer. Smoothed ...

James B. Pollack; Conway B. Leovy; Paul W. Greiman; Yale Mintz

1981-01-01T23:59:59.000Z

18

Multiple Equilibria in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global ocean general circulation model is forced using various upper boundary conditions (BCs) on temperature and salinity. Solutions are obtained under restoring and mixed BCs (i.e., a restoring condition on the upper-level temperature but ...

S. B. Power; R. Kleeman

1993-08-01T23:59:59.000Z

19

A Moist Benchmark Calculation for Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

A benchmark calculation is designed to compare the climate and climate sensitivity of atmospheric general circulation models (AGCMs). The experimental setup basically follows that of the aquaplanet experiment (APE) proposed by Neale and Hoskins, ...

Myong-In Lee; Max J. Suarez; In-Sik Kang; Isaac M. Held; Daehyun Kim

2008-10-01T23:59:59.000Z

20

On the Wind Power Input to the Ocean General Circulation  

E-Print Network (OSTI)

The wind power input to the ocean general circulation is usually calculated from the time-averaged wind products. Here, this wind power input is reexamined using available observations, focusing on the role of the synoptically ...

Zhai, Xiaoming

Note: This page contains sample records for the topic "research general circulation" 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

Connected Thermal and Transport Anomalies in the General Circulation  

Science Conference Proceedings (OSTI)

Two models of the oceanic response to cooling are discussed. Both are motivated by a desire to understand the effects of variable diabatic forcing on the general circulation. The first model considers an initial value problem in which an ...

William K. Dewar

1990-04-01T23:59:59.000Z

22

Diabatic Sources of Potential Vorticity in the General Circulation  

Science Conference Proceedings (OSTI)

A form of the potential vorticity (PV) budget is proposed that facilitates analysis on the role of global heat sources and sinks in the general circulation. A local diabatic source of PV occurs due to vertical variations of heating. Additionally, ...

Martin P. Hoerling

1992-12-01T23:59:59.000Z

23

Parameter Sensitivity of Primitive Equation Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

Experiments with a low resolution, primitive equation ocean general circulation model with idealized basin geometry and surface forcing have been carried out in order to identify the processes controlling the climatically important aspects of the ...

Frank Bryan

1987-07-01T23:59:59.000Z

24

Potential Evaporation and Soil Moisture in General Circulation Models  

Science Conference Proceedings (OSTI)

The parameterization of continental evaporation in many atmospheric general circulation models (GCMS) used for simulation of climate is demonstrably inconsistent with the empirical work upon which the parameterization is based. In the turbulent ...

P. C. D. Milly

1992-03-01T23:59:59.000Z

25

Modeling Global Lightning Distributions in a General Circulation Model  

Science Conference Proceedings (OSTI)

A general circulation model (GCM) is used to model global lightning distributions and frequencies. Both total and cloud-to-ground lightning frequencies are modeled using parameterizations that relate the depth of convective clouds to lightning ...

Colin Price; David Rind

1994-08-01T23:59:59.000Z

26

Initial Conditions for a General Circulation Model of Tropical Oceans  

Science Conference Proceedings (OSTI)

A general circulation model of the tropical Pacific Ocean, which realistically simulates El Niño of 1982–83, has been used to determine how different initial conditions affect the model. Given arbitrary initial conditions (not in equilibrium with ...

S. G. H. Philander; W. J. Hurlin; R. C. Pacanowski

1987-01-01T23:59:59.000Z

27

Optimizing Parameters in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

An efficient method to optimize the parameter values of the subgrid parameterizations of an atmospheric general circulation model is described. The method is based on the downhill simplex minimization of a cost function computed from the ...

C. A. Severijns; W. Hazeleger

2005-09-01T23:59:59.000Z

28

Factors Affecting Heat Transport in an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global ocean general circulation model with idealized geometry and coupled to a simple representation of atmospheric energy fluxes is used to investigate which physical factors determine meridional heat transport. A particular focus is on ...

Igor Kamenkovich; Jochem Marotzke; Peter H. Stone

2000-01-01T23:59:59.000Z

29

Using Green's Functions to Calibrate an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Green's functions provide a simple yet effective method to test and to calibrate general circulation model (GCM) parameterizations, to study and to quantify model and data errors, to correct model biases and trends, and to blend estimates from ...

Dimitris Menemenlis; Ichiro Fukumori; Tong Lee

2005-05-01T23:59:59.000Z

30

Baroclinic Development in Observations and NASA GSFC General Circulation Models  

Science Conference Proceedings (OSTI)

Comparative diagnostic analyses of developing synoptic-scale baroclinic disturbances in NCEP–NCAR reanalyses and the NASA–NCAR (NASCAR) and Aries [NASA’s Seasonal-to-Interannual Prediction Project (NSIPP)] general circulation model simulations ...

Dennis P. Robinson; Robert X. Black

2006-04-01T23:59:59.000Z

31

Indian Ocean Intraseasonal Variability in an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The impact of atmospheric intraseasonal variability on the tropical Indian Ocean is examined with an ocean general circulation model (OGCM). The model is forced by observation-based wind stresses and surface heat fluxes from an atmospheric ...

A. Schiller; J. S. Godfrey

2003-01-01T23:59:59.000Z

32

A Hybrid Coupled General Circulation Model for El Niño Studies  

Science Conference Proceedings (OSTI)

A model is developed for tropical air–sea interaction studies, which is intermediate in complexity between the large coupled general circulation models (coupled GCMs) coming into use and the simple two-level models with which pioneering El Niño–...

J. David Neelin

1990-03-01T23:59:59.000Z

33

The General Circulation and Robust Relative Humidity  

Science Conference Proceedings (OSTI)

The sensitivity of free-tropospheric relative humidity to cloud microphysics and dynamics is explored using a simple 2D humidity model and various configurations of the National Center for Atmospheric Research (NCAR) Community Atmosphere Model ...

S. C. Sherwood; C. L. Meyer

2006-12-01T23:59:59.000Z

34

A General Circulation Model for Upper Ocean Simulation  

Science Conference Proceedings (OSTI)

A general circulation model (GCM) of the ocean that emphasizes the simulation of the upper ocean has been developed. This emphasis is in keeping with its future intent, that of an air-sea coupled model. The basic model is the primitive equation ...

A. Rosati; K. Miyakoda

1988-11-01T23:59:59.000Z

35

Thermospheric General Circulation with Coupled Dynamics and Composition  

Science Conference Proceedings (OSTI)

A general circulation model has been developed for the atmosphere above 97 km. It uses a 5° latitude × 5° longitude grid and 24 vertical levels in increments of 0.5 scale height. The prognostic variables are horizontal winds, temperature, and the ...

Robert E. Dickinson; E. C. Ridley; R. G. Roble

1984-01-01T23:59:59.000Z

36

Validation of General Circulation Model Radiative Fluxes Using Surface Observations  

Science Conference Proceedings (OSTI)

The surface radiative fluxes of the ECHAM3 General Circulation Model (GCM) with T2 1, T42, and T 106 resolutions have been validated using observations from the Global Energy Balance Archive (GEBA, World Climate Program-Water Project A7). GEBA ...

Martin Wild; Atsumu Ohmura; Hans Gilgen; Erich Roeckner

1995-05-01T23:59:59.000Z

37

Diabatic Heating in the UCLA General Circulation Model  

Science Conference Proceedings (OSTI)

Diabatic heating rates calculated in the UCLA general circulation model are analyzed. The heating rates are for the December–January–February season for the mean of four climatological runs and the mean of four runs with observed 1982/83 sea ...

Bryan C. Weare

1988-07-01T23:59:59.000Z

38

Variability of the Thermohaline Circulation in an Ocean General Circulation Model Coupled to an Atmospheric Energy Balance Model  

Science Conference Proceedings (OSTI)

The variability of the ocean’s thermohaline circulation in an oceanic general circulation model (OGCM) coupled to a two-dimensional atmospheric energy balance model (EBM) is examined. The EBM calculates air temperatures by balancing heat fluxes, ...

David W. Pierce; K-Y. Kim; Tim P. Barnett

1996-05-01T23:59:59.000Z

39

Effects of Saturated and Dry Land Surfaces on the Tropical Circulation and Precipitation in a General Circulation Model  

Science Conference Proceedings (OSTI)

A comprehensive rhomboidal-15 general circulation model with idealized boundary conditions is used to investigate the effects of interactions between the tropical circulation and continental climate on the precipitation distribution. Sea surface ...

Kerry H. Cook; Anand Gnanadesikan

1991-09-01T23:59:59.000Z

40

Influence of Land Surface Roughness on Atmospheric Circulation and Precipitation: A Sensitivity Study with a General Circulation Model  

Science Conference Proceedings (OSTI)

The influence of land surface roughness on the large scale atmospheric circulation and rainfall was examined by comparing three sets of simulations made with a general circulation model in which the land surface roughness length, z0, was reduced ...

Y. C. Sud; J. Shukla; Y. Mintz

1988-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Effects of cumulus convection on the simulated monsoon circulation in a general circulation model  

SciTech Connect

The effect of cumulus convection on the Asian summer monsoon circulation is investigated, using a general circulation model. Two simulations for the summer months (June, July, and August) are performed, one parameterizing convection using a mass flux scheme and the other without convective parameterization. The results show that convection has significant effects on the monsoon circulation and its associated precipitation. In the simulation with the mass flux convective parameterization, precipitation in the western Pacific is decreased, together with a decrease in surface evaporation and wind speed. In the indian monsoon region it is almost the opposite. Comparison with a simulation using moist convective adjustment to parameterize convection shows that the monsoon circulation and precipitation distribution in the no-convection simulation are very similar to those in the simulation with moist convective adjustment. The difference in the large-scale circulation with and without convective parameterization is interpreted in terms of convective stabilization of the atmosphere by convection, using dry and moist static energy budgets. It is shown that weakening of the low-level convergence in the western Pacific in the simulation with convection is closely associated with the stabilization of the atmosphere by convection, mostly through drying of the lower troposphere; changes in low-level convergence lead to changes in precipitation. The precipitation increase in the Indian monsoon can be explained similarly. 29 refs., 12 figs.

Zhang, Guang Jun (Univ. of California, San Diego, La Jolla, CA (United States))

1994-09-01T23:59:59.000Z

42

Application of Improved Radiation Modeling to General Circulation Models  

SciTech Connect

This research has accomplished its primary objectives of developing accurate and efficient radiation codes, validating them with measurements and higher resolution models, and providing these advancements to the global modeling community to enhance the treatment of cloud and radiative processes in weather and climate prediction models. A critical component of this research has been the development of the longwave and shortwave broadband radiative transfer code for general circulation model (GCM) applications, RRTMG, which is based on the single-column reference code, RRTM, also developed at AER. RRTMG is a rigorously tested radiation model that retains a considerable level of accuracy relative to higher resolution models and measurements despite the performance enhancements that have made it possible to apply this radiation code successfully to global dynamical models. This model includes the radiative effects of all significant atmospheric gases, and it treats the absorption and scattering from liquid and ice clouds and aerosols. RRTMG also includes a statistical technique for representing small-scale cloud variability, such as cloud fraction and the vertical overlap of clouds, which has been shown to improve cloud radiative forcing in global models. This development approach has provided a direct link from observations to the enhanced radiative transfer provided by RRTMG for application to GCMs. Recent comparison of existing climate model radiation codes with high resolution models has documented the improved radiative forcing capability provided by RRTMG, especially at the surface, relative to other GCM radiation models. Due to its high accuracy, its connection to observations, and its computational efficiency, RRTMG has been implemented operationally in many national and international dynamical models to provide validated radiative transfer for improving weather forecasts and enhancing the prediction of global climate change.

Michael J Iacono

2011-04-07T23:59:59.000Z

43

Posters A Stratiform Cloud Parameterization for General Circulation Models  

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

Posters A Stratiform Cloud Parameterization for General Circulation Models S. J. Ghan and L. R. Leung Pacific Northwest Laboratory Richland, Washington C. C. Chuang and J. E. Penner Lawrence Livermore National Laboratory Livermore, California J. McCaa University of Washington Seattle, Washington The crude treatment of clouds in general circulation models (GCMs) is widely recognized as a major limitation in applying these models to predictions of global climate change. The purpose of this project is to develop a parameterization for stratiform clouds in GCMs that expresses stratiform clouds in terms of bulk microphysical properties and their subgrid variability. In this parameterization, precipitating cloud species are distinguished from non-precipitating species, and the liquid

44

Asian Summer Monsoon Intraseasonal Variability in General Circulation Models  

SciTech Connect

The goals of this report are: (1) Analyze boreal summer Asian monsoon intraseasonal variability general circulation models--How well do the models represent the eastward and northward propagating components of the convection and how well do the models represent the interactive control that the western tropical Pacific rainfall exerts on the rainfall over India and vice-versa? (2) Role of air-sea interactions--prescribed vs. interactive ocean; and (3) Mean monsoon vs. variability.

Sperber, K R; Annamalai, H

2004-02-24T23:59:59.000Z

45

Review of General Circulation Models and Downscaling Techniques  

Science Conference Proceedings (OSTI)

Climate forecasting and climate change projections are currently made with general circulation models (GCMs) that integrate the complex interactions of atmosphere-land-ocean-ice systems to simulate the Earth's climate and make projections of its future change on timescales from decades to centuries. This report reviews the current state of GCMs, including their approaches, limitations, uncertainties, and performance. The report also describes various downscaling techniques used to scale GCM output from c...

2009-07-31T23:59:59.000Z

46

Pacific Interannual and Interdecadal Equatorial Variability in a 1000-Yr Simulation of the CSIRO Coupled General Circulation Model  

Science Conference Proceedings (OSTI)

The structure and evolution of, and the mechanisms responsible for, interannual and decadal equatorial variability in a 1000-yr simulation of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) coupled general circulation ...

Daniel J. Vimont; David S. Battisti; Anthony C. Hirst

2002-01-01T23:59:59.000Z

47

Stratospheric Wind Errors, Initial States and Forecast Skill in the GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

Relations between stratospheric wind errors, initial states and 500 mb skill are investigated using the GLAS general circulation model initialized with FGGE data. Erroneous stratospheric winds are seen in all current general circulation models, ...

J. Tenenbaum

1983-09-01T23:59:59.000Z

48

The Significance of Thermodynamic Forcing by Cumulus Convection in a General Circulation Model  

Science Conference Proceedings (OSTI)

To assess the effects of cumulus convection on the general circulation of the atmosphere, a medium-resolution, spectral general circulation model was integrated twice for 40 simulated days from identical initial conditions, with and without a ...

Leo J. Donner; Hsaio-Lan Kuo; Eric J. Pitcher

1982-10-01T23:59:59.000Z

49

The Response of a Spectral General Circulation Model to Refinements in Radiative Processes  

Science Conference Proceedings (OSTI)

We present here results and analyses of a series of numerical experiments performed with a spectral general circulation model (GCM). The purpose of the GCM experiments is to examine the role of radiation/cloud processes in the general circulation ...

V. Ramanathan; Eric J. Pitcher; Robert C. Malone; Maurice L. Blackmon

1983-03-01T23:59:59.000Z

50

A Simplified General Circulation Model for a Baroclinic Ocean with Topography. Part I: Theory, Waves, and Wind-Driven Circulations  

Science Conference Proceedings (OSTI)

A new type of ocean general circulation model with simplified physics is described and tested for various simple wind-driven circulation problems. The model consists of the vorticity balance of the depth-averaged flow and a hierarchy of equations ...

Dirk Olbers; Carsten Eden

2003-12-01T23:59:59.000Z

51

Quasi-Periodic Oscillations in a Symmetric General Circulation Model  

Science Conference Proceedings (OSTI)

Long lime integrations with a symmetric version of the CLAS Climate Model with hydrology have shown that the Hadley circulation has well defined strong and weak episodes. This oscillation of the Hadley circulation seems to occur in two dominant ...

B. N. Gyoswami; J. Shukla

1984-01-01T23:59:59.000Z

52

The Sensitivity of Surface Energy Balance to Convective Parameterization in a General Circulation Model  

Science Conference Proceedings (OSTI)

This study investigates the interaction between convection and the surface energy fluxes, and its sensitivity to convective parameterization schemes using a general circulation model. Two simulations of the global circulation averaged annually ...

Guang Jun Zrkng

1995-05-01T23:59:59.000Z

53

The Steady-State Atmospheric Circulation Response to Climate Change–like Thermal Forcings in a Simple General Circulation Model  

Science Conference Proceedings (OSTI)

The steady-state extratropical atmospheric response to thermal forcing is investigated in a simple atmospheric general circulation model. The thermal forcings qualitatively mimic three key aspects of anthropogenic climate change: warming in the ...

Amy H. Butler; David W. J. Thompson; Ross Heikes

2010-07-01T23:59:59.000Z

54

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

55

A History of Prevailing Ideas about the General Circulation of the Atmosphere  

Science Conference Proceedings (OSTI)

During the past three centuries. the prevailing ideas about the general circulation of the earth's atmosphere have evolved in a stepwise manner. Early in each step, a new theoretical idea is formulated. Late in each step, the idea gains general ...

Edward N. Lorenz

1983-07-01T23:59:59.000Z

56

Improving the Detection and Tracking of Tropical Cyclones in Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

Dynamical seasonal forecasts of tropical storm frequency require robust and efficient algorithms for detection and tracking of tropical storms in atmospheric general circulation models (AGCMs). Tropical storms are generally detected when dynamic ...

Suzana J. Camargo; Stephen E. Zebiak

2002-12-01T23:59:59.000Z

57

The Ocean general circulation near 1000 m depth  

Science Conference Proceedings (OSTI)

The mean Ocean circulation near 1000 m depth is estimated with a 100 km resolution from the Argo float displacements collected before January 1 2010. After a thorough validation, the 400 000 or so displacements found in the [950, 1150] dbar layer ...

Michel Ollitrault; Alain Colin de Verdière

58

Role of a Cumulus Parameterization Scheme in Simulating Atmospheric Circulation and Rainfall in the Nine-Layer Goddard Laboratory for Atmospheres General Circulation Model  

Science Conference Proceedings (OSTI)

A coarse (4° × 5° × 9-sigma level) version of the Goddard Laboratory for Atmospheres (GLA) General Circulation Model (GCM) was used to investigate the influence of a cumulus convection scheme on the simulated atmospheric circulation and ...

Y. C. Sud; Winston C. Chao; G. K. Walker

1992-04-01T23:59:59.000Z

59

Tropical Intraseasonal Oscillations Appearing in a GFDL General Circulation Model and FGGE Data. Part II: Structure  

Science Conference Proceedings (OSTI)

Space-time spectral and filter analyses are made of the structure of the tropical intraseasonal oscillations appearing in a GFDL 30-wavenumber spectral general circulation model and the FGGE IIIb data set.

Y. Hayashi; D. G. Golder

1988-11-01T23:59:59.000Z

60

Spectral Energetics of the General Circulation and Time Spectra of Transient Waves during the FGGE Year  

Science Conference Proceedings (OSTI)

The spectral energetics of the general circulation are presented for the entire FGGE year based on the GFDL analyses of FGGE observations. The global energy balance and those of the Northern and Southern hemispheres show a reasonable agreement. ...

Ernest C. Kung

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Effect of Cloud-Radiation Feedback on the Climate of a General Circulation Model  

Science Conference Proceedings (OSTI)

The General Circulation Model (GCM) of the Goddard Laboratory for Atmospheric Sciences (GLAS) was integrated for 107 days starting from the initial conditions of 15 May. In this experiment the clouds dynamically generated by the model affect the ...

J. Shukla; Y. Sud

1981-11-01T23:59:59.000Z

62

Space-Time Spectral Structure of a GLAS General Circulation Model and a Comparison with Observations  

Science Conference Proceedings (OSTI)

The wavenumber-frequency spectra of geopotential height have been computed from a winter simulation of a GLAS general circulation model, and are compared to the spectra obtained from 15 winters of observed analyses. The variances in several ...

David M. Straus; J. Shukla

1981-05-01T23:59:59.000Z

63

Oceanic Data Analysis Using a General Circulation Model. Part II: A North Atlantic Model  

Science Conference Proceedings (OSTI)

A general circulation model and North Atlantic climatological data of temperature salinity, wind stress, evaporation minus precipitation, and air–sea heat fluxes are used to examine the possibility of solving inverse problems using a full-scale ...

Eli Tziperman; William Carlisle Thacker; Robert Bryan Long; Show-Ming Hwang; Stephen R. Rintoul

1992-12-01T23:59:59.000Z

64

Forcing and Sampling of Ocean General Circulation Models: Impact of High-Frequency Motions  

Science Conference Proceedings (OSTI)

Significant inertial oscillations are present in all primitive equation ocean general circulation models when they are forced with high-frequency (period order of days) wind stress fields. At specific latitudes the energy of the wind stress ...

Steven R. Jayne; Robin Tokmakian

1997-06-01T23:59:59.000Z

65

Land Surface Hydrology Parameterization for Atmospheric General Circulation models Including Subgrid Scale Spatial Variability  

Science Conference Proceedings (OSTI)

Parameterizations are developed for the representation of subgrid hydrologic processes in atmospheric general circulation models. Reasonable a priori probability density functions of the spatial variability of soil moisture and of precipitation ...

D. Entekhabi; P. S. Eagleson

1989-08-01T23:59:59.000Z

66

The Implementation and Validation of Improved Land-Surface Hydrology in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

New land-surface hydrologic parameterizations are implemented into the NASA Goddard Institute for Space Studies (GISS) General Circulation Model (GCM). These parameterizations are: 1) runoff and evapotranspiration functions that include the ...

Kevin D. Johnson; Dara Entekhabi; Peter S. Eagleson

1993-06-01T23:59:59.000Z

67

A Comparison of General Circulation Model Predictions to Sand Drift and Dune Orientations  

Science Conference Proceedings (OSTI)

The growing concern over climate change and desertification stresses the importance of aeolian process prediction. In this paper the use of a general circulation model to predict current aeolian features is examined. A GCM developed at NASA/...

Dan G. Blumberg; Ronald Greeley

1996-12-01T23:59:59.000Z

68

Integrated and Spectral Energetics Studies of the GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

Integrated and spectral energetics of the Goddard Laboratory for Atmospheric Sciences (GLAS) general circulation model are compared with observations and examined when subdivided beyond hemispheric integrals. In the monthly mean zonal averages, ...

J. Tenenbaum

1982-08-01T23:59:59.000Z

69

The Effects of Topography on the Atmospheric Energetics in. a Low-Resolution General Circulation Model  

Science Conference Proceedings (OSTI)

An analysis is made of the effect of orography on the atmospheric energetics in a low-resolution general circulation model to determine the temporal and scale dependency of these effects. The numerical model is a global, spectral, primitive ...

Yun-Qi Ni; Bette L. Otto-Bliesner; David D. Houghton

1986-07-01T23:59:59.000Z

70

Greenhouse Gas–induced Climate Change Simulated with the CCC Second-Generation General Circulation Model  

Science Conference Proceedings (OSTI)

The Canadian Climate Centre second-generation atmospheric general circulation model coupled to a mixed-layer ocean incorporating thermodynamic sea ice is used to simulate the equilibrium climate response to a doubling of C02. Features of the ...

G. J. Boer; N. A. McFarlane; M. Lazare

1992-10-01T23:59:59.000Z

71

Linearization of an Oceanic General Circulation Model for Data Assimilation and Climate Studies  

Science Conference Proceedings (OSTI)

A recipe for the linearization and state reduction of a general circulation model (GCM) is evaluated in a North Pacific test basin. The underlying assumption is that modern GCMs are, or will become, sufficiently accurate so that large-scale ...

Dimitris Menemenlis; Carl Wunsch

1997-12-01T23:59:59.000Z

72

The Dynamics of an Explosively Developing Cyclone Simulated by a General Circulation Model  

Science Conference Proceedings (OSTI)

The synoptic structure and dynamics of an explosively developing winter extratropical cyclone simulated by NCAR’s CCM2 general circulation model is examined and compared with cyclones that have developed explosively in nature. The primary ...

Karen D. Walthorn; Phillip J. Smith

1998-11-01T23:59:59.000Z

73

Climatology of the SKYHI Troposphere–Stratosphere–Mesosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The long-term mean climatology obtained from integrations conducted with different resolutions of the GFDL “SKYHI” finite-difference general circulation model is examined. A number of improvements that have been made recently in the model are ...

Kevin Hamilton; R. John Wilson; J. D. Mahlman; L. J. Umscheid

1995-01-01T23:59:59.000Z

74

The Zonally Averaged Transport Characteristics of the GFDL General Circulation/Transport Model  

Science Conference Proceedings (OSTI)

The GFDL general circulation/tracer model has been used to generate the transport coefficients required in two-dimensional (zonally averaged) transport formulations. This was done by assuming a flux-gradient relationship and then, given gradient ...

R. A. Plumb; J. D. Mahlman

1987-01-01T23:59:59.000Z

75

A Potential Predictability Study Conducted with an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

This paper describes a potential predictability study on the results of a 20.5 year simulation conducted with the Canadian Climate Centre (CCC) General Circulation Model (GCM). The CCC GCM is an atmosphere GCM with surface hydrology, soil ...

F. W. Zwiers

1987-12-01T23:59:59.000Z

76

A Comparison of Radiation Variables Calculated in the UCLA General Circulation Model to Observations  

Science Conference Proceedings (OSTI)

Comparisons are made between the spatial patterns of solar and thermal fluxes of radiation calculated by the UCLA general circulation model and observations. The latter include estimates at the Pacific Ocean surface of the climatological averages ...

Bryan C. Weare

1988-05-01T23:59:59.000Z

77

The Local Balances of Vorticity and Heat for Blocking Anticyclones in a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

Blocking anticyclones that appear in perpetual January simulations of a spectral general circulation model are examined. Blocks in three geographical regions are studied: the North Pacific, the North Atlantic and western North America. Local time-...

Steven L. Mullen

1986-07-01T23:59:59.000Z

78

Understanding El Niño in Ocean–Atmosphere General Circulation Models: Progress and Challenges  

Science Conference Proceedings (OSTI)

Determining how El Niño and its impacts may change over the next 10 to 100 years remains a difficult scientific challenge. Ocean–atmosphere coupled general circulation models (CGCMs) are routinely used both to analyze El Niño mechanisms and ...

Eric Guilyardi; Andrew Wittenberg; Alexey Fedorov; Mat Collins; Chunzai Wang; Antonietta Capotondi; Geert Jan van Oldenborgh; Tim Stockdale

2009-03-01T23:59:59.000Z

79

Effects of Transient Eddies on Blocking Flows: General Circulation Model Experiments  

Science Conference Proceedings (OSTI)

Prediction of blocking flows by a comprehensive general circulation model is still not satisfactory. A large portion of the unskillful forecasts can be traced to the model's inability to predict the evolution of blocking beyond a few days into ...

Wilbur Y. Chen; Hann-ming Henry Juang

1992-05-01T23:59:59.000Z

80

Toward a Physically Based Gravity Wave Source Parameterization in a General Circulation Model  

Science Conference Proceedings (OSTI)

Middle atmospheric general circulation models (GCMs) must employ a parameterization for small-scale gravity waves (GWs). Such parameterizations typically make very simple assumptions about gravity wave sources, such as uniform distribution in ...

Jadwiga H. Richter; Fabrizio Sassi; Rolando R. Garcia

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

The January and July Performance of the OSU Two-Level Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A modified version of the two-level atmospheric general circulation model has been developed and used in the simulation of January and July global climates. The overall physical and numerical formulation of this Oregon State University (OSU) ...

Michael E. Schlesinger; W. Lawrence Gates

1980-09-01T23:59:59.000Z

82

Interannual to Decadal Predictability in a Coupled Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The predictability of the coupled ocean–atmosphere climate system on interannual to decadal timescales has been studied by means of ensemble forecast experiments with a global coupled ocean–atmosphere general circulation model. Over most parts of ...

A. Grötzner; M. Latif; A. Timmermann; R. Voss

1999-08-01T23:59:59.000Z

83

The Frontogenetical Forcing of Secondary Circulations. Part I: The Duality and Generalization of the Q Vector  

Science Conference Proceedings (OSTI)

Hoskins, Draghici, and others have shown that the Q vector is an important quantity in quasi-geostrophic (QG) theory for the diagnosis of ageostrophic circulations. In this paper, a vorticity dynamics perspective is used to develop a generalized ...

Robert Davies-Jones

1991-02-01T23:59:59.000Z

84

Parameterization of PBL Processes in an Atmospheric General Circulation Model: Description and Preliminary Assessment  

Science Conference Proceedings (OSTI)

This paper presents the basic features of a newly developed planetary boundary layer (PBL) parameterization, and the performance assessment of a version of the University of California, Los Angeles (UCLA), Atmospheric General Circulation Model (...

Celal S. Konor; Gabriel Cazes Boezio; Carlos R. Mechoso; Akio Arakawa

2009-03-01T23:59:59.000Z

85

Thermohaline Oscillations Induced by Strong Steady Salinity Forcing of Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

A series of numerical experiments is conducted with a three-dimensional ocean general circulation model and a two-dimensional counterpart both designed for efficient integration over diffusive (millennial) time scales. With strong steady salinity ...

Michael Winton; E. S. Sarachik

1993-07-01T23:59:59.000Z

86

Equatorial Superrotation and Maintenance of the General Circulation in Two-Level Models  

Science Conference Proceedings (OSTI)

Suarez and Duffy have noted an interesting bifurcation in a two-level gridpoint general circulation model when strong tropical heating is imposed. This bifurcation results in a model climatology with strong upper-level westerlies in the tropics. ...

R. Saravanan

1993-05-01T23:59:59.000Z

87

How Sensitive Are Coarse General Circulation Models to Fundamental Approximations in the Equations of Motion?  

Science Conference Proceedings (OSTI)

The advent of high-precision gravity missions presents the opportunity to accurately measure variations in the distribution of mass in the ocean. Such a data source will prove valuable in state estimation and constraining general circulation ...

Martin Losch; Alistair Adcroft; Jean-Michel Campin

2004-01-01T23:59:59.000Z

88

Empirical Stochastic Models for the Dominant Climate Statistics of a General Circulation Model  

Science Conference Proceedings (OSTI)

Two Markov models with different dynamics and forcing are used to model the transient eddy statistics of an idealized general circulation model (GCM). The first Markov model employs a physically based dynamical operator composed of the linearized ...

Timothy DelSole; Arthur Y. Hou

1999-10-01T23:59:59.000Z

89

Oceanic Data Analysis Using a General Circulation Model. Part I: Simulations  

Science Conference Proceedings (OSTI)

This paper deals with the solution of inverse problems involving complex numerical models of the oceanic general circulation and large datasets. The goal of these inverse problems is to find values for model inputs consistent with a steady ...

Eli Tziperman; William Carlisle Thacker; Robert Bryan Long; Show-Ming Hwang

1992-12-01T23:59:59.000Z

90

The General Circulation and Meridional Heat Transport of the Subtropical South Atlantic Determined by Inverse Methods  

Science Conference Proceedings (OSTI)

Using hydrographic data of the IGY and METEOR expeditions, the inverse method of Wunsch (1978) has been applied to the subtropical South Atlantic Ocean to determine its general circulation and meridional heat transport. The method is based on the ...

Lee-Lueng Fu

1981-09-01T23:59:59.000Z

91

Simulation of Regional Climate Using a Limited Area Model Nested in a General Circulation Model  

Science Conference Proceedings (OSTI)

A Limited Area Model (LAM) is nested in a General Circulation Model (GCM) to simulate the January climate over the western United States. In the nesting procedure, the GCM output is used to provide the initial and lateral atmospheric boundary ...

Filippo Giorgi

1990-09-01T23:59:59.000Z

92

A January Angular Momentum Balance in the OSU Two-Level Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The atmospheric angular momentum balance is studied by analyzing the data during a simulated January of the Oregon State University two-level atmospheric general circulation model. Monthly zonal means of the Coriolis torques, the vertical ...

J-W. Kim; W. Grady

1982-05-01T23:59:59.000Z

93

Constraining a North Atlantic Ocean General Circulation Model with Chlorofluorocarbon Observations  

Science Conference Proceedings (OSTI)

Measurements of anthropogenic tracers such as chlorofluorocarbons and tritium must be quantitatively combined with ocean general circulation models as a component of systematic model development. The authors have developed and tested an inverse ...

S. L. Gray; T. W. N. Haine

2001-05-01T23:59:59.000Z

94

Climate Simulation for 125 kyr BP with a Coupled Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The ECHAM-1 T21/LSG coupled ocean–atmosphere general circulation model (GCM) is used to simulate climatic conditions at the last interglacial maximum (Eemian, 125 kyr BP). The results reflect the expected surface temperature changes (with respect ...

Marisa Montoya; Hans von Storch; Thomas J. Crowley

2000-03-01T23:59:59.000Z

95

Simulations of Mid-Holocene Climate Using an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The authors describe a first paleoclimatological application of the Canadian Centre for Climate Modelling and Analysis atmospheric general circulation model (AGCM) to simulate the climate state 6000 calendar years before present (6 kyr BP). ...

G. Vettoretti; W. R. Peltier; N. A. McFarlane

1998-10-01T23:59:59.000Z

96

The Extratropical 40-Day Oscillation in the UCLA General Circulation Model. Part I: Atmospheric Angular Momentum  

Science Conference Proceedings (OSTI)

Variations in atmospheric angular momentum (AAM) are examined in a three-year simulation of the large-scale atmosphere with perpetual January forcing. The simulation is performed with a version of the UCLA general circulation model that contains ...

S. L. Marcus; M. Ghil; J. O. Dickey

1994-06-01T23:59:59.000Z

97

A Simple Biosphere Model (SIB) for Use within General Circulation Models  

Science Conference Proceedings (OSTI)

A simple but realistic biosphere model has been developed for calculating the transfer of energy, mass and momentum between the atmosphere and the vegetated surface of the earth. The model is designed for use in atmospheric general circulation ...

P. J. Sellers; Y. Mintz; Y. C. Sud; A. Dalcher

1986-03-01T23:59:59.000Z

98

Interactions between Cloud Microphysics and Cumulus Convection in a General Circulation Model  

Science Conference Proceedings (OSTI)

In the Colorado State University general circulation model, cumulus detrainment of cloud water and cloud ice has been, up to now, the only direct coupling between convective and large-scale condensation processes. This one-way interaction from ...

Laura D. Fowler; David A. Randall

2002-11-01T23:59:59.000Z

99

Surface Energy Fluxes and Coupled Variability in the Tropics of a Coupled General Circulation Model  

Science Conference Proceedings (OSTI)

The effect of wind-evaporative feedbacks upon ENSO, and the coupling of Pacific and Indian Ocean variability, is considered based upon a 110-yr simulation from a coupled ocean and atmosphere general circulation model.

R. L. Miller; X. Jiang

1996-07-01T23:59:59.000Z

100

The Canadian Climate Centre Second-Generation General Circulation Model and Its Equilibrium Climate  

Science Conference Proceedings (OSTI)

The Canadian Climate Centre second generation general circulation model (GCMII) is described. The description emphasizes aspects in which the new model differs from the 1984 model (GCMI) as described by Boer and collaborators. Important features ...

N. A. McFarlane; G. J. Boer; J-P. Blanchet; M. Lazare

1992-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Dynamical Core of an Atmospheric General Circulation Model on a Yin–Yang Grid  

Science Conference Proceedings (OSTI)

The three-dimensional dynamical core of an atmospheric general circulation model employing Yin–Yang grid is developed and examined. Benchmark test cases based on the shallow-water model configuration are first performed to examine the validity of ...

Yuya Baba; Keiko Takahashi; Takeshi Sugimura; Koji Goto

2010-10-01T23:59:59.000Z

102

Free and Laterally Nudged Antarctic Climate of an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Because many of the synoptic cyclones south of the 60°S parallel originate from 60°S and lower latitudes, nudging an atmospheric general circulation model (AGCM) with meteorological analyses at the periphery of the Antarctic region may be ...

Christophe Genthon; Gerhard Krinner; Emmanuel Cosme

2002-06-01T23:59:59.000Z

103

On the Influence of the Andes on the General Circulation of the Southern Hemisphere  

Science Conference Proceedings (OSTI)

An experiment is described in which the Andean topography in a general circulation model is replaced by an envelope topography and a new model climatology is produced. The resulting simulation is compared to the model climatology of an experiment ...

Kevin Walsh

1994-06-01T23:59:59.000Z

104

Evaluating Parameterizations in General Circulation Models: Climate Simulation Meets Weather Prediction  

Science Conference Proceedings (OSTI)

To significantly improve the simulation of climate by general circulation models (GCMs), systematic errors in representations of relevant processes must first be identified, and then reduced. This endeavor demands that the GCM parameterizations ...

Thomas J. Phillips; Gerald L. Potter; David L. Williamson; Richard T. Cederwall; James S. Boyle; Michael Fiorino; Justin J. Hnilo; Jerry G. Olson; Shaocheng Xie; J. John Yio

2004-12-01T23:59:59.000Z

105

Surface Energy Balances of Three General Circulation Models: Implications for Simulating Regional Climate Change  

Science Conference Proceedings (OSTI)

We examine surface energy balances simulated by three general circulation models for current climatic boundary conditions and for an atmosphere with twice current levels of CO2. Differences between model simulations provide a measure of ...

William J. Gutowski Jr.; David S. Gutzler; Wei-Chyung Wang

1991-02-01T23:59:59.000Z

106

Potential Predictability and AMIP Implications of Midlatitude Climate Variability in Two General Circulation Models  

Science Conference Proceedings (OSTI)

Ensembles of extended Atmospheric Model Intercomparison Project (AMIP) runs from the general circulation models of the National Centers for Environmental Prediction (formerly the National Meteorological Center) and the Max-Planck Institute (...

T. P. Barnett; K. Arpe; L. Bengtsson; M. Ji; A. Kumar

1997-09-01T23:59:59.000Z

107

A Comparison between General Circulation Model Simulations Using Two Sea Surface Temperature Datasets for January 1979  

Science Conference Proceedings (OSTI)

Simulations with the UCLA atmospheric general circulation model (AGCM) using two different global sea surface temperature (SST) datasets for January 1979 are compared. One of these datasets is based on COADS (SSTs) at locations where there are ...

Tomoaki Ose; Carlos R. Mechoso; David Halpern

1994-04-01T23:59:59.000Z

108

Testing the Annular Mode Autocorrelation Time Scale in Simple Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

A new diagnostic for measuring the ability of atmospheric models to reproduce realistic low-frequency variability is introduced in the context of Held and Suarez’s 1994 proposal for comparing the dynamics of different general circulation models. ...

Edwin P. Gerber; Sergey Voronin; Lorenzo M. Polvani

2008-04-01T23:59:59.000Z

109

North Atlantic Potential Vorticity and Its Relation to the General Circulation  

Science Conference Proceedings (OSTI)

Maps and sections of the large-scale North Atlantic potential vorticity q are presented. Here q is fd?/dz, where f is the Coriolis frequency, ? the potential density and z the vertical coordinate. They bear on the general circulation, and on ...

Scott McDowell; Peter Rhines; Thomas Keffer

1982-12-01T23:59:59.000Z

110

The Parameterization Of the Planetary Boundary Layer in the UCLA General Circulation Model: Formulation and Results  

Science Conference Proceedings (OSTI)

A planetary boundary layer (PBL) parameterization for general circulation models (GCMs) is presented. It uses a mixed-layer approach in which the PBL is assumed to be capped by discontinuities in the mean profiles. Both clear and cloud-topped ...

Max J. Suarez; Akio Arakawa; David A. Randall

1983-11-01T23:59:59.000Z

111

Data Constraints Applied to Models of the Ocean General Circulation. Part I: The Steady Case  

Science Conference Proceedings (OSTI)

In this work we take a first step in the process of assimilating data into models of the ocean general circulation. The goals is not prediction but rather understanding how the data insertion process affects, and is affected by, the dynamics ...

Paola Malanotte-Rizzoli; William R. Holland

1986-10-01T23:59:59.000Z

112

Atmospheric Vacillations in a General Circulation Model. III: Analysis using Transformed Eulerian-Mean Diagnostics  

Science Conference Proceedings (OSTI)

The vacillatory behavior of the general circulation model described by Hunt (1978a,b) is analyzed using transformed Eulerian-mean diagnostics. This model was shown by Hunt to have large time variations in the troposphere and stratosphere with a ...

David J. Karoly

1982-12-01T23:59:59.000Z

113

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"

114

Selected translated abstracts of Russian-language climate-change publications. 4: General circulation models  

SciTech Connect

This report presents English-translated abstracts of important Russian-language literature concerning general circulation models as they relate to climate change. Into addition to the bibliographic citations and abstracts translated into English, this report presents the original citations and abstracts in Russian. Author and title indexes are included to assist the reader in locating abstracts of particular interest.

Burtis, M.D. [comp.] [Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center; Razuvaev, V.N.; Sivachok, S.G. [All-Russian Research Inst. of Hydrometeorological Information--World Data Center, Obninsk (Russian Federation)

1996-10-01T23:59:59.000Z

115

A Method for Direct Solution of a Steady Linearized Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

A steady linearized version of a general circulation model (GCM) is a potentially useful tool for diagnosis and understanding of the time-mean solutions of the GCM. A method is developed for direct solution of the linearized equations. The method ...

Edwin K. Schneider

1989-10-01T23:59:59.000Z

116

The Work Done by the Wind on the Oceanic General Circulation  

Science Conference Proceedings (OSTI)

A new estimate is made using altimeter data of the rate at which the wind works on the oceanic general circulation. The value of about 1 TW is lower than previously estimated and is dominated by the work done by the mean zonal wind in the ...

Carl Wunsch

1998-11-01T23:59:59.000Z

117

Why is the AMOC mono-stable in Coupled General Circulation Models?  

Science Conference Proceedings (OSTI)

This paper is concerned with the question: why do Coupled General Circulation Models (CGCM) seem to be biased towards a mono-stable AMOC? In particular, we investigate whether the mono-stable behavior of the CGCMs is caused by a bias of model ...

Wei Liu; Zhengyu Liu; Esther C. Brady

118

AA Fest. General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa  

SciTech Connect

OAK-B135 AA Fest. General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa

Ide, K.; Wakimoto, R.M.

1998-01-20T23:59:59.000Z

119

Circulation  

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

up from the Research Library. Lost Damaged Missing Items Replacement of LANL Research Library items that are lost, damaged beyond repair, or stolen is the responsibility of...

120

Regional Characteristics of the Northern Hemisphere Wintertime Circulation: A Comparison of the Simulation of a GFDL General Circulation Model with Observations  

Science Conference Proceedings (OSTI)

The hemispheric distributions of a selected set of temporal mean, variance and covariance statistics produced by a general circulation model developed at the Geophysical Fluid Dynamics Laboratory are compared with observations. The fields ...

Maurice L. Blackmon; Ngar-Cheung Lau

1980-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Simulation of the Atlantic Circulation with a Coupled Sea Ice-Mixed Layer-Isopycnal General Circulation Model. Part I: Model Description  

Science Conference Proceedings (OSTI)

A diabatic ocean general circulation model based on primitive equations is described. It uses isopycnals as Lagrangian coordinates in the vertical and predicts a free surface. Prognostic fields of temperature and salinity enter the dynamics as ...

Josef M. Oberhuber

1993-05-01T23:59:59.000Z

122

Research Laboratories General Motors Corporation General Motors Technical Center  

Office of Legacy Management (LM)

MI. 1-q Research Laboratories General Motors Corporation General Motors Technical Center Warren, Michigan 48090 January 21, 1977 Occupational Health Standards Branch Office of Standards Development U. S. Nuclear Requlatory Commission Washington, D.C. 20555 Attention: Mr. Robert E. Alexander, Chief Dear Mr. Alexander: In 1974, General Motors Corporation acquired a manufacturing plant in Adrian, Michigan. On October 21, 1976, General Motors announced that work would begin immediately to prepare the plant for manufacturing operations (Appendix A). A news release, made by Mr. Irving Loop of ERDA and carried by radio station WABJ of Adrian, Michigan on May 11, 1976, stated that natural uranium was handled in the plant after World War II and that

123

Research in lost circulation control for geothermal wells  

DOE Green Energy (OSTI)

This paper reviews recent progress at Sandia National Laboratories in the area of lost circulation control for geothermal wells. The Lost Circulation Program has three major elements: (1) Detection and characterization of loss zones, (2) Development of new techniques and materials for control of loss zones, and (3) Integration of the first two items for wellsite application. Most of our work to date has been in the area of developing new techniques and materials. We report here on progress that has been made in the past two years in the development of new, pumpable cementitious muds, in situ mixing and placement of polyurethane foams, and fundamental analysis of and materials development for particulate lost circulation materials. Plans for work in the area of zone detection and characterization, including development of a transient, lost circulation hydraulics simulator and field zone characterization using an advanced wellbore televiewer, are discussed.

Ortega, A.; Loeppke, G.E.; Givler, R.C.

1987-01-01T23:59:59.000Z

124

Single-Column Modeling A Stratiform Cloud Parameterization for General Circulation Models  

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

A Stratiform Cloud Parameterization A Stratiform Cloud Parameterization for General Circulation Models S. J. Ghan and L. R. Leung Pacific Northwest Laboratory Richland, WA 99352 C. C. Chuang and J. E. Penner Lawrence Livermore National Laboratory : Livermore. CA 94550 J. McCaa University of Washington Seattle, Washington The crude treatment of clouds in general circulation models (GCMs) is widely recognized as a major limitation in applying these models to predictions of global climate change. The purpose of this project is to develop in GCMs a stratiform cloud parameterization that expresses clouds in terms of bulk microphysical properties and their subgrid variability. Figure 1 summarizes the various cloud variables and their interactions. Precipitating cloud species are distinguished from non-precipitating species, and the liquid phase is

125

Influence of the Extratropical Ocean Circulation on the Intertropical Convergence Zone in an Idealized Coupled General Circulation Model  

Science Conference Proceedings (OSTI)

The authors present coupled model simulations in which the ocean's meridional overturning circulation (MOC) sets the zonal mean location of the intertropical convergence zone (ITCZ) in the hemisphere with deep-water production. They use a coarse-...

Neven S. Fu?kar; Shang-Ping Xie; Riccardo Farneti; Elizabeth A. Maroon; Dargan M. W. Frierson

2013-07-01T23:59:59.000Z

126

Cloud-radiative effects on implied oceanic energy transports as simulated by atmospheric general circulation models  

DOE Green Energy (OSTI)

This paper reports on energy fluxes across the surface of the ocean as simulated by fifteen atmospheric general circulation models in which ocean surface temperatures and sea-ice boundaries are prescribed. The oceanic meridional energy transport that would be required to balance these surface fluxes is computed, and is shown to be critically sensitive to the radiative effects of clouds, to the extent that even the sign of the Southern Hemisphere ocean energy transport can be affected by the errors in simulated cloud-radiation interactions.

Gleckler, P.J. [Lawrence Livermore National Lab., CA (United States); Randall, D.A. [Colorado State Univ., Fort Collins, CO (United States); Boer, G. [Canadian Climate Centre, Victoria (Canada)

1994-03-01T23:59:59.000Z

127

Cross Correlations between the Radiation and Atmospheric Variables in a General Circulation Model and in Satellite Data  

Science Conference Proceedings (OSTI)

The classical picture of the influence of midlatitude troughs on cloud patterns is investigated in a general circulation model (GCM) and in satellite and National Meteorological Centre (NMC) data by comparing the cross correlation of the poleward ...

Thomas P. Charlock; Fred G. Rose; Karen M. Cattany-Cranes

1989-01-01T23:59:59.000Z

128

Transient Planetary Waves Simulated by GFDL Spectral General Circulation Models. Part II: Effects of Nonlinear Energy Transfer  

Science Conference Proceedings (OSTI)

In order to study how transient planetary waves in the midlatitude troposphere are maintained, a space-time spectral analysis over a 1-year data set is made of a GFDL spectral general circulation model.

V. Hayashi; D. G. Golder

1983-04-01T23:59:59.000Z

129

The Surface Energy Balance at Local and Regional Scales-A Comparison of General Circulation Model Results with Observations  

Science Conference Proceedings (OSTI)

Aspects of the mean monthly energy balance at continental surfaces are examined by appeal to the results of general circulation model (GCM) simulations, climatological maps of surface fluxes, and direct observations. Emphasis is placed on net ...

J. R. Garratt; P. B. Krummel; E. A. Kowalczyk

1993-06-01T23:59:59.000Z

130

An Investigation with a General Circulation Model of the Climatic Effects of Cloud Albedo Changes Caused by Atmospheric Pollution  

Science Conference Proceedings (OSTI)

A hemispheric general circulation model, with fixed zonally averaged cloud cover, was used to investigate the climatic impact of increased albedo of low-level clouds caused by atmospheric pollution. The albedo of these clouds was increased from ...

B. G. Hunt

1982-08-01T23:59:59.000Z

131

A Comparison of Climates Simulated by a General Circulation Model when Run in the Annual Cycle and Perpetual Modes  

Science Conference Proceedings (OSTI)

A comparison is made between the climate simulated by the Canadian Climate Centre (CCC) General Circulation Model when run its usual “annual cycle”mode, in which the solar declination angle varies annually, and the climate which is simulated when ...

F. W. Zwiers; G. J. Boer

1987-11-01T23:59:59.000Z

132

Interactions between Gravity Waves and Planetary-Scale Flow Simulated by the GFDL “SKYHI” General Circulation Model  

Science Conference Proceedings (OSTI)

In order to study interactions between gravity waves and planetary flow in the middle atmosphere, a 3° latitude by 3.6° longitude version of the 40-level GFDL “SKYHI” general circulation model is analyzed using bihourly sampled output data.

S. Miyahara; Y. Hayashi; J. D. Mahlman

1986-09-01T23:59:59.000Z

133

Troposphere-Stratosphere (Surface-55 km) Monthly Winter General Circulation Statistics for the Northern Hemisphere-Four Year Averages  

Science Conference Proceedings (OSTI)

Monthly mean Northern Hemisphere general circulation statistics are presented for the four-year average December, January and February months of the winters 1978–79 through 1981–82. These calculations start with daily maps for eighteen pressure ...

Marvin A. Geller; Mao-Fou Wu; Melvyn E. Gelman

1983-05-01T23:59:59.000Z

134

Gravity Wave Characteristics in the Southern Hemisphere Revealed by a High-Resolution Middle-Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

Gravity wave characteristics in the middle- to high-latitude Southern Hemisphere are analyzed using simulation data over 3 yr from a high-resolution middle-atmosphere general circulation model without using any gravity wave parameterizations. ...

Kaoru Sato; Satoshi Tateno; Shingo Watanabe; Yoshio Kawatani

2012-04-01T23:59:59.000Z

135

Hydrological cycles over the Congo and Upper Blue Nile basins: Evaluation of General Circulation Models Simulations and Reanalysis Data Products  

Science Conference Proceedings (OSTI)

The simulations and predictions of the hydrological cycle by General Circulation Models (GCMs) are characterized by a significant degree of uncertainty. This uncertainty is reflected in the range of IPCC (Intergovernmental Panel on Climate Change) ...

Mohamed S. Siam; Marie-Estelle Demory; Elfatih A. B. Eltahir

136

The Simulation of Stationary and Transient Geopotential-Height Eddies in January and July with a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

We examine the characteristics of stationary and transient eddies in the geopotential-height field as simulated by a spectral general circulation model. The model possesses a realistic distribution of continents and oceans and realistic, but ...

Robert C. Malone; Eric J. Pitcher; Maurice L. Blackmon; Kamal Puri; William Bourke

1984-04-01T23:59:59.000Z

137

Verification of General Circulation Models Applied to the Hamburg University GCM. Part I: Test of Individual Climate States  

Science Conference Proceedings (OSTI)

One objective of general circulation models is to simulate, e.g., a “January” which is not distinguishable from observed Januaries. A strategy to verify an individual simulated state is proposed. Its main elements are: data compression by means ...

Hans von Storch; Erich Roeckner

1983-10-01T23:59:59.000Z

138

The Albedo Field and Cloud Radiative Forcing Produced by a General Circulation Model with Internally Generated Cloud Optics  

Science Conference Proceedings (OSTI)

A spectral general circulation model (GCM) is run for perpetual January with fixed sea surface temperature conditions. It has internally generated, variable cloud optical properties as well as variable cloud arm and heights. The cloud optics are ...

Thomas P. Charlock; V. Ramanathan

1985-07-01T23:59:59.000Z

139

Simulation of the Tropical Pacific Climate with a Coupled Ocean-Atmosphere General Circulation Model. Part II: Interannual Variability  

Science Conference Proceedings (OSTI)

Two multiyear simulations with a coupled ocean-atmosphere general circulation model (GCM)-totaling 45 years-are used to investigate interannual variability at the equator. The model consists of the UCLA global atmospheric GCM coupled to the GFDL ...

A. W. Robertson; C-C. Ma; M. Ghil; C. R. Mechoso

1995-05-01T23:59:59.000Z

140

An Assessment of Possible Climate Change in the Australian Region Based on an Intercomparison of General Circulation Modeling Results  

Science Conference Proceedings (OSTI)

To assist in estimating likely future climate change in the Australian region, the authors examine the results of four different general circulation modeling experiments run to assess the equilibrium impact of doubling greenhouse gases. The ...

P. H. Whetton; A. B. Pittock; M. R. Haylock; P. J. Rayner

1994-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Relationships between Net Radiation at the Surface and the Top of the Atmosphere Derived from a General Circulation Model  

Science Conference Proceedings (OSTI)

The relationships between the net radiation at the surface and the top of the atmosphere in the UCLA general circulation model are investigated. These suggest that it may be possible to formulate statistical models from limited observations ...

Bryan C. Weare

1989-02-01T23:59:59.000Z

142

Comparisons of empirical localization techniques for serial ensemble Kalman filters in a simple atmospheric general circulation model  

Science Conference Proceedings (OSTI)

Two techniques for estimating good localization functions for serial ensemble Kalman filters are compared in observing system simulation experiments (OSSE) conducted with the dynamical core of an atmospheric general circulation model. The first ...

Lili Lei; Jeffrey L. Anderson

143

Analysis of General Circulation Model Sea-Surface Temperature Anomaly Simulations Using a Linear Model. Part I: Forced Solutions  

Science Conference Proceedings (OSTI)

Experiments are presented which indicate that many features of the response of a general circulation model to sea-surface temperature anomalies in the equatorial Pacific east of the dateline can be reproduced with a linear nondivergent barotropic ...

Grant Branstator

1985-11-01T23:59:59.000Z

144

A Description of a 1260-Year Control Integration with the Coupled ECHAM1/LSG General Circulation Model  

Science Conference Proceedings (OSTI)

A 1260-yr integration generated by the ECHAM1/LSG (Large Scale Geostrophic) coupled atmosphere–ocean general circulation model is analyzed in this paper. The analysis focuses on the climate drift and on the variations of the coupled atmosphere–...

Jin-Song von Storch; Viatcheslav V. Kharin; Ulrich Cubasch; Gabriele C. Hegerl; Dierk Schriever; Hans von Storch; Eduardo Zorita

1997-07-01T23:59:59.000Z

145

Seasonal Simulations of the Planetary Boundary Layer and Boundary-Layer Stratocumulus Clouds with a General Circulation Model  

Science Conference Proceedings (OSTI)

The UCLA general circulation model (GCM) has been used to simulate the seasonally varying planetary boundary layer (PBL), as well as boundary-layer stratus and stratocumulus clouds. The PBL depth is a prognostic variable of the GCM, incorporated ...

David A. Randall; James A. Abeles; Thomas G. Corsetti

1985-04-01T23:59:59.000Z

146

Liquid and Ice Cloud Microphysics in the CSU General Circulation Model. Part III: Sensitivity to Modeling Assumptions  

Science Conference Proceedings (OSTI)

The inclusion of cloud microphysical processes in general circulation models makes it possible to study the multiple interactions among clouds, the hydrological cycle, and radiation. The gaps between the temporal and spatial scales at which such ...

Laura D. Fowler; David A. Randall

1996-03-01T23:59:59.000Z

147

Liquid and Ice Cloud Microphysics in the CSU General Circulation Model. Part 1: Model Description and Simulated Microphysical Processes  

Science Conference Proceedings (OSTI)

Microphysical processes responsible for the formation and dissipation of water and ice clouds have been incorporated into the Colorado State University General Circulation Model in order to 1) yield a more physically based representation of the ...

Laura D. Fowler; David A. Randall; Steven A. Rutledge

1996-03-01T23:59:59.000Z

148

General Circulation Model Calculations of the Direct Radiative Forcing by Anthropogenic Sulfate and Fossil-Fuel Soot Aerosol  

Science Conference Proceedings (OSTI)

A new radiation code within a general circulation model is used to assess the direct solar and thermal radiative forcing by sulfate aerosol of anthropogenic origin and soot aerosol from fossil-fuel burning. The radiative effects of different ...

J. M. Haywood; D. L. Roberts; A. Slingo; J. M. Edwards; K. P. Shine

1997-07-01T23:59:59.000Z

149

Impact of Climate Drift on Twenty-First-Century Projection in a Coupled Atmospheric–Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Reducing climate drift in coupled atmosphere–ocean general circulation models (AOGCMs) usually requires 1000–2000 years of spinup, which has not been practical for every modeling group to do. For the purpose of evaluating the impact of climate ...

Mao-Chang Liang; Li-Ching Lin; Ka-Kit Tung; Yuk L. Yung; Shan Sun

2013-10-01T23:59:59.000Z

150

Narrow- and Broad-Band Satellite Measurements of Shortwave Radiation: Conversion Simulations with a General Circulation Model  

Science Conference Proceedings (OSTI)

The Oregon State University/Lawrence Livermore National Laboratory general circulation model has been employed as a vehicle for suggesting and exploring various means of converting narrow-band measurements of reflected solar radiation from the ...

Robert D. Cess; Gerald L. Potter

1986-12-01T23:59:59.000Z

151

A Diagnostic Study of Recurrent Meteorological Anomalies Appearing in a 15-Year Simulation with a GFDL General Circulation Model  

Science Conference Proceedings (OSTI)

The spatial structure and temporal characteristics of prominent anomalies occurring in a 15-year simulation with a GFDL spectral general circulation model are examined using empirical orthogonal functions, teleconnection patterns, composite ...

Ngar-Cheung Lau

1981-11-01T23:59:59.000Z

152

A General Circulation Model Study of January Climate Anomaly Patterns Associated with Interannual Variation of Equatorial Pacific Sea Surface Temperatures  

Science Conference Proceedings (OSTI)

A general circulation model has been run in the perpetual January mode to produce several long-term simulations, each distinguished by a different imposed equatorial Pacific sea surface temperature. From each of them simulations we have extracted ...

Maurice L. Blackmon; John E. Geisler; Eric J. Pitcher

1983-06-01T23:59:59.000Z

153

Conservative Semi-Lagrangian Transport on a Sphere and the Impact on Vapor Advection in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A conservative semi-Lagrangian scheme with rational function for interpolation is implemented in spherical geometry and tested in an atmospheric general circulation model (AGCM). The new scheme, different from the conventional semi-Lagrangian ...

Xindong Peng; Feng Xiao; Wataru Ohfuchi; Hiromitsu Fuchigami

2005-03-01T23:59:59.000Z

154

Variability of the Tropical Atlantic Ocean Simulated by a General Circulation Model with Two Different Mixed-Layer Physics  

Science Conference Proceedings (OSTI)

The embedment of a 1.5 turbulence closure model in an ocean general circulation model of the equatorial Atlantic is presented. The eddy viscosity and diffusivity involved in the vertical mixing are defined as the product of a characteristic ...

Bruno Blanke; Pascale Delecluse

1993-07-01T23:59:59.000Z

155

Volcanic forcing improves Atmosphere-Ocean Coupled General Circulation Model scaling performance  

E-Print Network (OSTI)

Recent Atmosphere-Ocean Coupled General Circulation Model (AOGCM) simulations of the twentieth century climate, which account for anthropogenic and natural forcings, make it possible to study the origin of long-term temperature correlations found in the observed records. We study ensemble experiments performed with the NCAR PCM for 10 different historical scenarios, including no forcings, greenhouse gas, sulfate aerosol, ozone, solar, volcanic forcing and various combinations, such as it natural, anthropogenic and all forcings. We compare the scaling exponents characterizing the long-term correlations of the observed and simulated model data for 16 representative land stations and 16 sites in the Atlantic Ocean for these scenarios. We find that inclusion of volcanic forcing in the AOGCM considerably improves the PCM scaling behavior. The scenarios containing volcanic forcing are able to reproduce quite well the observed scaling exponents for the land with exponents around 0.65 independent of the station dista...

Vyushin, D; Havlin, S; Bunde, A; Brenner, S; Vyushin, Dmitry; Zhidkov, Igor; Havlin, Shlomo; Bunde, Armin; Brenner, Stephen

2004-01-01T23:59:59.000Z

156

Interannual Variability in the Northern Hemisphere Winter Middle Atmosphere in Control and Perturbed Experiments with the GFDL SKYHI General Circulation Model  

Science Conference Proceedings (OSTI)

This paper reports on interannual variability of the Northern Hemisphere winter stratospheric circulation as simulated by the 40-level GFDL “SKYHI” general circulation model. A 31-year control simulation was performed using a climatological ...

Kevin Hamilton

1995-01-01T23:59:59.000Z

157

A study of longwave radiation codes for climate studies: Validation with ARM observations and tests in general circulation models  

SciTech Connect

Research by the US Department of Energy (DOE) has shown that cloud radiative feedback is the single most important effect determining the magnitude of possible climatic responses to human activity. However, these effects are still not known at the levels needed for climate prediction. Consequently, DOE has launched a major initiative-- the Atmospheric Radiation Measurements (ARM) Program -- directed at improving the parameterization of the physics governing cloud and radiative processes in general circulation models (GCM's). One specific goal of ARM is to improve the treatment of radiative transfer in GCM's under clear-sky, general overcast and broken cloud conditions. Our approach to developing the radiation model will be to test existing models in an iterative, predictive fashion. We will supply the Clouds and Radiative Testbed (CART) with a set of models to be compared with operationally observed data. The differences we find will lead to the development of new models to be tested with new data. Similarly, our GCM studies will use existing GCM's to study the radiation sensitivity problem. We anticipate that the outcome of this approach will provide both a better longwave radiative forcing algorithm and a better understanding of how longwave radiative forcing influences the equilibrium climate of the atmosphere.

Ellingson, R.G.; Baer, F.

1992-01-01T23:59:59.000Z

158

Project Brief: General Electric, GE Global Research  

Science Conference Proceedings (OSTI)

... for rapidly routing electrical energy to customers from diverse sources such as wind and solar powered devices. RECIPIENT: General Electric, GE ...

2010-10-05T23:59:59.000Z

159

A hierarchical framework for coupling surface fluxes to atompsheric general circulation models: The homogeneity test  

SciTech Connect

The atmosphere and the biosphere are inherently coupled to one another. Atmospheric surface state variables such as temperature, winds, water vapor, precipitation, and radiation control biophysical, biogeochemical, and ecological processes at the surface and subsurface. At the same time, surface fluxes of momentum, moisture, heat, and trace gases act as time-dependent boundary conditions providing feedback on atmospheric processes. To understand such phenomena, a coupled set of interactive models is required. Costs are still prohibitive for computing surface/subsurface fluxes directly for medium-resolution atmospheric general circulation models (AGCMs), but a technique has been developed for testing large-scale homogeneity and accessing surface parameterizations and models to reduce this computational cost and maintain accuracy. This modeling system potentially bridges the observed spatial and temporal ranges yet allows the incorporation of necessary details about individual ecological community types or biomes and simulates the net momentum, heat, moisture, and trace gas fluxes. This suite of coupled models is defined here as the hierarchical systems flux scheme (HSFS).

Miller, N.L.

1993-01-01T23:59:59.000Z

160

The Structure and Predictability of the “High-Latitude Mode” in the CSIRO9 General Circulation Model  

Science Conference Proceedings (OSTI)

The CSIRO9 general circulation model shows a zonally symmetric mode of variability, which closely resembles the high-latitude mode (HLM) in middle and high latitudes of the Southern Hemisphere. The leading EOF of the zonal mean zonal wind between ...

John W. Kidson; Ian G. Watterson

1999-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

A Comparison of Baroclinic Instability with the Time Variations of Kinetic Energy in a General Circulation Model  

Science Conference Proceedings (OSTI)

The flow generated by a general circulation model is zonally averaged at 1-day intervals, and, for each of the axisymmetric flows obtained, the linear growth-rate spectrum for baroclinic waves is computed using a linear model. The time sequence ...

Robert Walko; Robert Gall

1980-08-01T23:59:59.000Z

162

Diagnosing the Annual Cycle of the Equatorial Undercurrent in the Atlantic Ocean from a General Circulation Model  

Science Conference Proceedings (OSTI)

Ten-year-long output series from a general circulation model forced by daily realistic winds are used to analyze the annual cycle of the Equatorial Undercurrent (EUC) in the Atlantic Ocean. Two well-defined transport maxima are found: One, ...

M. Arhan; A. M. Treguier; B. Bourlès; S. Michel

2006-08-01T23:59:59.000Z

163

Data Constraints Applied to Models of the Ocean General Circulation. Part II: The Transient, Eddy-Resolving Case  

Science Conference Proceedings (OSTI)

In Part I of the present work we performed assimilation experiments with a multilayer, quasi-geostrophic (QG) eddy-resolving model of the ocean general circulation. In Part I we studied the quasi-linear, steady state and the assimilated data were ...

Paola Malanotte-Rizzoli; William R. Holland

1988-08-01T23:59:59.000Z

164

The Response of a Global Ocean General Circulation Model to Climatological Surface Boundary Conditions for Temperature and Salinity  

Science Conference Proceedings (OSTI)

The response of a global ocean general circulation model (OGCM) to different surface heat and freshwater fluxes is examined. The aim is to determine the most appropriate way to spin up an OGCM prior to coupling it with an atmospheric GCM. ...

Andrew M. Moore; Christopher J. C. Reason

1993-02-01T23:59:59.000Z

165

Comparison of Ocean Surface Solar Irradiance in the GLA General Circulation Model and Satellite-based Calculations  

Science Conference Proceedings (OSTI)

A global, 7-year satellite-based record of ocean surface solar irradiance (SSI) is used to assess the realism of ocean SSI simulated by the nine-layer Goddard Laboratory for Atmospheres (GLA) General Circulation Model (GCM). January and July ...

Beth Chertock; Y. C. Sud

1993-03-01T23:59:59.000Z

166

SECHIBA, a New Set of Parameterizations of the Hydrologic Exchanges at the Land-Atmosphere Interface within the LMD Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A simple parameterization of the hydrologic exchanges between the soil-vegetation system and the atmosphere (SECHIBA) has been developed for use within atmospheric general circulation models (AGCM).

Nathale I. Ducoudré; Katia Laval; Alain Perrier

1993-02-01T23:59:59.000Z

167

The Response of a Linear Model of the Tropical Pacific to Surface Winds from the NCAR General Circulation Model  

Science Conference Proceedings (OSTI)

An experiment in which surface wind stress data from the National Center for Atmospheric Research global circulation model (GCM) was used to drive a simple model of the tropical Pacific is described. First, a 15-year integration of the GCM was ...

Nicholas E. Graham; Tim P. Barnett; Vijay G. Panchang; Ole M. Smedstad; James J. O'Brien; Robert M. Chervin

1989-09-01T23:59:59.000Z

168

Extreme Events and the General Circulation: Observations and Stochastic Model Dynamics  

Science Conference Proceedings (OSTI)

This study explores the dynamical role of non-Gaussian potential vorticity variability (extreme events) in the zonally averaged circulation of the atmosphere within a stochastic framework. First the zonally averaged skewness and kurtosis patterns ...

Philip Sura; Maxime Perron

2010-09-01T23:59:59.000Z

169

Depth-Integrated Vorticity Budget of the Southern Ocean from a General Circulation Model  

Science Conference Proceedings (OSTI)

An analysis of the depth-integrated vorticity budget of the U.K. Fine Resolution Antarctic Model is used to investigate the mechanisms that maintain and dissipate vorticity in the Antarctic Circumpolar Current (ACC) and adjacent circulations of ...

N. C. Wells; B. A. De Cuevas

1995-11-01T23:59:59.000Z

170

On the Onset of Inertial Recirculation in Barotropic General Circulation Models  

Science Conference Proceedings (OSTI)

A nonlinear ordinary differential equation which models the western boundary layer of quasi-geostrophic barotropic models of the wind-driven circulation has been investigated by Il'in and Kamenkovich and more recently by Ierley and Ruehr. For ...

Glenn R. Ierley

1987-12-01T23:59:59.000Z

171

A Statistical Generalization of the Transformed Eulerian-Mean Circulation for an Arbitrary Vertical Coordinate System  

Science Conference Proceedings (OSTI)

A new method is derived for approximating the mean meridional circulation in an arbitrary vertical coordinate system using only the time-mean and zonally averaged meridional velocity, meridional eddy transport, and eddy variance. The method is ...

Olivier Pauluis; Tiffany Shaw; Frédéric Laliberté

2011-08-01T23:59:59.000Z

172

Nonlinear Asymptotic Stability of Munk's Solution of the General Circulation Problem  

Science Conference Proceedings (OSTI)

The Lyapunov direct method is applied to the quasigeostrophic dynamics to deduce a nonlinear, asymptotic stability criterion, in the energy norm, for the wind-driven, one-layered oceanic circulation. The lateral diffusion of relative vorticity as ...

Fulvio Crisciani; Fabio Cavallini; Renzo Mosetti

1995-07-01T23:59:59.000Z

173

Rate of Work Done by Atmospheric Pressure on the Ocean General Circulation and Tides  

Science Conference Proceedings (OSTI)

Quantitative analysis of the energetics of the ocean is crucial for understanding its circulation and mixing. The power input by fluctuations in atmospheric pressure pa resulting from the S1 and S2 air tides and the stochastic continuum is ...

Rui M. Ponte

2009-02-01T23:59:59.000Z

174

Renzo Tomellini, EC Directorate General for Research and innovation...  

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

on Critical Materials, ChairsAnimateurs: Jeff Skeer, DOE Office of Policy and International Affairs and Renzo Tomellini, EC Directorate General for Research and Innovation...

175

Aerosol indirect effects – general circulation model intercomparison and evaluation with satellite data  

Science Conference Proceedings (OSTI)

Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated in the present study using three satellite datasets. The satellite datasets are taken as reference bearing in mind that cloud and aerosol retrievals include uncertainties. We compute statistical relationships between aerosol optical depth (?a) and various cloud and radiation quantities consistently in models and satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (Nd) compares relatively well to the satellite data at least over oceans. The relationship between ?a and liquid water path is simulated much too strongly by the models. It is shown that this is partly related to rep¬resentation of the second aerosol indirect effect in terms of autoconversion. A positive re¬lationship between total cloud fraction (fcld) and ?a as found in the satellite data is simulated by the majority of the models, albeit less strongly in most of them. In a discussion of the hypo¬theses proposed in the literature to explain the satellite-derived strong fcld – ?a relation¬ship, we find that none is unequivocally confirmed by our results. Relationships similar to the ones found in satellite data between ?a and cloud top tem¬perature and outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - ?a relationship show a strong positive cor¬relation between ?a and cloud fraction. The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of ?a, and parameterisation assumptions such as a lower bound on Nd. Nevertheless, the strengths of the statistical relationships are good predictors for the short-wave total aerosol forcings in the models. An estimate of the total short-wave aerosol forcing inferred from the combination of these predictors for the modelled forcings with the satellite-derived statistical relationships yields a global annual mean value of -1.5±0.5 Wm-2. An alternative estim¬ate obtained by scaling the simulated clear- and cloudy-sky forcings with estimates of anthropogenic ?a and satellite-retrieved Nd – ?a regression slopes, respectively, yields a global annual mean clear-sky (aerosol direct effect) es¬timate of -0.4±0.2 Wm-2 and a cloudy-sky (aerosol indirect effect) estimate of -0.7±0.5 Wm-2, with a total estimate of -1.2±0.4 Wm-2.

Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, T.; Wang, Minghuai; Penner, Joyce E.; Gettelman, A.; Lohmann, U.; Bellouin, N.; Boucher, Olivier; Sayer, Andrew M.; Thomas, Gareth E.; McComiskey, A.; Feingold, G.; Hoose, Corinna; Kristjansson, J. E.; Liu, Xiaohong; Balkanski, Y.; Donner, Leo J.; Ginoux, P.; Stier, P.; Grandey, B.; Feichter, J.; Sednev, Igor; Bauer, Susanne E.; Koch, D.; Grainger, Roy G.; Kirkevag, A.; Iversen, T.; Seland, O.; Easter, Richard C.; Ghan, Steven J.; Rasch, Philip J.; Morrison, H.; Lamarque, J. F.; Iacono, Michael J.; Kinne, Stefan; Schulz, M.

2009-11-16T23:59:59.000Z

176

AA Fest General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa  

SciTech Connect

On January 20-22, 1998, ''AA Fest. A Symposium on General Circulation Model Development: Past, Present, and Future'' was held at the North West Campus Auditorium of University of California, Los Angeles, in honor of Professor Ako Arawaka. The symposium consisted of two-and-a-half-day technical presentations, along with a banquet in the opening evening and a reception during the poster session of the second evening.

Ide, Kayo

1998-01-22T23:59:59.000Z

177

Aerosol indirect effects ? general circulation model intercomparison and evaluation with satellite data  

SciTech Connect

Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated using three satellite datasets. The focus is on stratiform liquid water clouds since most GCMs do not include ice nucleation effects, and none of the model explicitly parameterises aerosol effects on convective clouds. We compute statistical relationships between aerosol optical depth ({tau}{sub a}) and various cloud and radiation quantities in a manner that is consistent between the models and the satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (N{sub d}) compares relatively well to the satellite data at least over the ocean. The relationship between {tau}{sub a} and liquid water path is simulated much too strongly by the models. This suggests that the implementation of the second aerosol indirect effect mainly in terms of an autoconversion parameterisation has to be revisited in the GCMs. A positive relationship between total cloud fraction (f{sub cld}) and {tau}{sub a} as found in the satellite data is simulated by the majority of the models, albeit less strongly than that in the satellite data in most of them. In a discussion of the hypotheses proposed in the literature to explain the satellite-derived strong f{sub cld} - {tau}{sub a} relationship, our results indicate that none can be identified as a unique explanation. Relationships similar to the ones found in satellite data between {tau}{sub a} and cloud top temperature or outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - {tau}{sub a} relationship show a strong positive correlation between {tau}{sub a} and f{sub cld} The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of {tau}{sub a}, and parameterization assumptions such as a lower bound on N{sub d}. Nevertheless, the strengths of the statistical relationships are good predictors for the aerosol forcings in the models. An estimate of the total short-wave aerosol forcing inferred from the combination of these predictors for the modelled forcings with the satellite-derived statistical relationships yields a global annual mean value of -1.5 {+-} 0.5 Wm{sup -2}. In an alternative approach, the radiative flux perturbation due to anthropogenic aerosols can be broken down into a component over the cloud-free portion of the globe (approximately the aerosol direct effect) and a component over the cloudy portion of the globe (approximately the aerosol indirect effect). An estimate obtained by scaling these simulated clear- and cloudy-sky forcings with estimates of anthropogenic {tau}{sub a} and satellite-retrieved Nd - {tau}{sub a} regression slopes, respectively, yields a global, annual-mean aerosol direct effect estimate of -0.4 {+-} 0.2 Wm{sup -2} and a cloudy-sky (aerosol indirect effect) estimate of -0.7 {+-} 0.5 Wm{sup -2}, with a total estimate of -1.2 {+-} 0.4 Wm{sup -2}.

Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, Toshihiko; Wang, Minghuai; Penner, Joyce E.; Gettelman, Andrew; Lohmann, Ulrike; Bellouin, Nicolas; Boucher, Olivier; Sayer, Andrew M.; Thomas, Gareth E.; McComiskey, Allison; Feingold, Graham; Hoose, Corinna; Kristansson, Jon Egill; Liu, Xiaohong; Balkanski, Yves; Donner, Leo J.; Ginoux, Paul A.; Stier, Philip; Grandey, Benjamin; Feichter, Johann; Sednev, Igor; Bauer, Susanne E.; Koch, Dorothy; Grainger, Roy G.; Kirkevag, Alf; Iversen, Trond; Seland, Oyvind; Easter, Richard; Ghan, Steven J.; Rasch, Philip J.; Morrison, Hugh; Lamarque, Jean-Francois; Iacono, Michael J.; Kinne, Stefan; Schulz, Michael

2010-03-12T23:59:59.000Z

178

Research Highlight  

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

Many Forecast Errors Are Climate Errors Download a printable PDF Submitter: Xie, S., Lawrence Livermore National Laboratory Area of Research: General Circulation and Single Column...

179

Research Highlight  

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

Black Carbon Aerosols and the Third Polar Ice Cap Submitter: Menon, S., Lawrence Berkeley National Laboratory Area of Research: General Circulation and Single Column Models...

180

Research Highlight  

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

K-Distribution Method for a SW Radiative Transfer Model Submitter: Ackerman, T. P., University of Washington Area of Research: General Circulation and Single Column Models...

Note: This page contains sample records for the topic "research general circulation" 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

A study of longwave radiation codes for climate studies: Validation with ARM observations and tests in general circulation models. Final report, September 15, 1990--October 31, 1994  

SciTech Connect

DOE has launched a major initiative -- the Atmospheric Radiation Measurements (ARM) Program -- directed at improving the parameterization of the physics governing cloud and radiative processes in general circulation models (GCMs). One specific goal of ARM is to improve the treatment of radiative transfer in GCMs under clear-sky, general overcast and broken cloud conditions. In 1990, the authors proposed to contribute to this goal by attacking major problems connected with one of the dominant radiation components of the problem -- longwave radiation. In particular, their long-term research goals are to: develop an optimum longwave radiation model for use in GCMs that has been calibrated with state-of-the-art observations, assess the impact of the longwave radiative forcing in a GCM, determine the sensitivity of a GCM to the radiative model used in it, and determine how the longwave radiative forcing contributes relatively when compared to shortwave radiative forcing, sensible heating, thermal advection and expansion.

Ellingson, R.G.; Baer, F.

1998-09-01T23:59:59.000Z

182

Support of Publication Costs, Atlantic Meridional Overturning Circulation Special Issue of Deep Sea Research II Journal  

SciTech Connect

The contribution of funds from DOE supported publication costs of a special issue of Deep Sea Research arising from presentations at the First U.S. Atlantic Meridional Overturning Circulation (AMOC) Meeting held 4-6 May, 2009 to review the US implementation plan and its coordination with other monitoring activities. The special issue includes a total of 16 papers, including publications from three DOE-supported investigators (ie Sevellec, F., and A.V. Fedorov; Hu et. al., and Wan et. al.,). The special issue addresses DOE interests in understanding and simulation/modeling of abrupt climate change.

Amy Honchar

2012-11-12T23:59:59.000Z

183

The Effects of Condensational Heating on Midlatitude Transient Waves in Their Mature Stage: Control Experiments with a GFDL General Circulation model  

Science Conference Proceedings (OSTI)

The effects of condensational heating on midlatitude transient waves in their mature stage are re-examined by comparing moist and dry GFDL spectral general circulation models, both of which have all ocean surfaces with prescribed zonally uniform ...

Y. Hayashi; D. G. Golder

1981-11-01T23:59:59.000Z

184

Factors Maintaining the Zonally Asymmetric Precipitation Distribution and Low-Level Flow in the Tropics of an Atmospheric General Circulation Model: Diagnostic Studies  

Science Conference Proceedings (OSTI)

The roles played by the large-scale motion induced by vertical diffusion of heat from the lower boundary and condensational heating due to deep convection in maintaining the precipitation zones in the Tropics of an atmospheric general circulation ...

David G. Dewitt; Edwin K. Schneider; Anandu D. Vernekar

1996-08-01T23:59:59.000Z

185

A Cumulus Parameterization Including Mass Fluxes, Convective Vertical Velocities, and Mesoscale Effects: Thermodynamic and Hydrological Aspects in a General Circulation Model  

Science Conference Proceedings (OSTI)

A cumulus parameterization based on mass fluxes, convective-scale vertical velocities, and mesoscale effects has been incorporated in an atmospheric general circulation model (GCM). Most contemporary cumulus parameterizations are based on ...

Leo J. Donner; Charles J. Seman; Richard S. Hemler; Songmiao Fan

2001-08-01T23:59:59.000Z

186

Analysis of Convective Transport and Parameter Sensitivity in a Single Column Version of the Goddard Earth Observation System, Version 5, General Circulation Model  

Science Conference Proceedings (OSTI)

Convection strongly influences the distribution of atmospheric trace gases. General circulation models (GCMs) use convective mass fluxes calculated by parameterizations to transport gases, but the results are difficult to compare with trace gas ...

L. E. Ott; J. Bacmeister; S. Pawson; K. Pickering; G. Stenchikov; M. Suarez; H. Huntrieser; M. Loewenstein; J. Lopez; I. Xueref-Remy

2009-03-01T23:59:59.000Z

187

Southward Eddy Heat Transport Occurring along Southern Flanks of the Kuroshio Extension and the Gulf Stream in a 1/10° Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The present study investigates meridional heat transport induced by oceanic mesoscale variability in the World Ocean using a 1/10° global Ocean General Circulation Model (OGCM) running on the Earth Simulator. The results indicate prominent ...

Kunihiro Aoki; Shoshiro Minobe; Youichi Tanimoto; Yoshikazu Sasai

188

Sea Surface Temperature Biases under the Stratus Cloud Deck in the Southeast Pacific Ocean in 19 IPCC AR4 Coupled General Circulation Models  

Science Conference Proceedings (OSTI)

This study examines systematic biases in sea surface temperature (SST) under the stratus cloud deck in the southeast Pacific Ocean and upper-ocean processes relevant to the SST biases in 19 coupled general circulation models (CGCMs) participating ...

Yangxing Zheng; Toshiaki Shinoda; Jia-Lin Lin; George N. Kiladis

2011-08-01T23:59:59.000Z

189

A Revised Land Surface Parameterization (SiB2) for GCMS. Part III: The Greening of the Colorado State University General Circulation Model  

Science Conference Proceedings (OSTI)

SiB2, the second-generation land-surface parameterization developed by Sellers et al., has been incorporated into the Colorado State University general circulation model and tested in multidecade simulation. The control run uses a “bucket” ...

D.A. Randall; D.A. Dazlich; C. Zhang; A.S. Denning; P.J. Sellers; C.J. Tucker; L. Bounoua; J.A. Berry; G.J. Collatz; C.B. Field; S.O. Los; C.O. Justice; I. Fung

1996-04-01T23:59:59.000Z

190

Sensitivity of the position and variability of the eddy-driven jet to different SST profiles in an aquaplanet general circulation model  

Science Conference Proceedings (OSTI)

The response of the storm-track and eddy-driven jet to various steady sea surface temperatures (SST) forcings is analyzed using the aquaplanet configuration of the atmospheric general circulation model ARPEGE-Climat. The SST profiles are zonally ...

Clio Michel; Gwendal Rivière

191

Simulation of ENSO-Related Surface Winds in the Tropical Pacific by an Atmospheric General Circulation Model Forced by Observed Sea Surface Temperatures  

Science Conference Proceedings (OSTI)

The authors present the simulation of the tropical Pacific surface wind variability by a low-resolution (R15 horizontal resolution and 18 vertical levels) version of the Center for Ocean-Land-Atmosphere Interactions, Maryland, general circulation ...

B. N. Goswami; V. Krishnamurthy; N. H. Saji

1995-06-01T23:59:59.000Z

192

Adjusting to policy expectations in climate change modeling : an interdiciplinary study of flux adjustments in coupled atmosphere-ocean general circulation models  

E-Print Network (OSTI)

This paper surveys and interprets the attitudes of scientists to the use of flux adjustments in climate projections with coupled Atmosphere Ocean General Circulation Models. The survey is based largely on the responses of ...

Shackley, Simon.; Risbey, James; Stone, Peter H.; Wynne, Brian

193

Development of a Two-Dimensional Zonally Averaged Statistical-Dynamical Model.Part II: The Role of Eddy Momentum Fluxes in the General Circulation and their Parameterization  

Science Conference Proceedings (OSTI)

The effect of eddy momentum fluxes on the general circulation is investigated with the aid of perpetual January simulations with a two-dimensional, zonally averaged model. Sensitivity experiments with this model show that the vertical eddy flux ...

Peter H. Stone; Mao-Sung Yao

1987-12-01T23:59:59.000Z

194

Effects of Subgrid-Scale Mixing Parameterizations on Simulated Distributions of Natural 14C, Temperature, and Salinity in a Three-Dimensional Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The effects of parameterizations of subgrid-scale mixing on simulated distributions of natural 14C, temperature, and salinity in a three-dimensional ocean general circulation model are examined. The parameterizations studied are 1) the Gent–...

Philip B. Duffy; Ken Caldeira; Jerry Selvaggi; Martin I. Hoffert

1997-04-01T23:59:59.000Z

195

Seasonal Near-Surface Dynamics and Thermodynamics of the Indian Ocean and Indonesian Throughflow in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The near-surface dynamics and thermodynamics of the Indian Ocean are examined in a global ocean general circulation model (OGCM) with enhanced tropical resolution. The model uses a Seager-type heat flux formulation (weak relaxation toward a fixed ...

A. Schiller; J. S. Godfrey; P. C. McIntosh; G. Meyers; S. E. Wijffels

1998-11-01T23:59:59.000Z

196

Sensitivity of the Aerosol Indirect Effect to Subgrid Variability in the Cloud Parameterization of the GFDL Atmosphere General Circulation Model AM3  

Science Conference Proceedings (OSTI)

The recently developed GFDL Atmospheric Model version 3 (AM3), an atmospheric general circulation model (GCM), incorporates a prognostic treatment of cloud drop number to simulate the aerosol indirect effect. Since cloud drop activation depends on ...

Jean-Christophe Golaz; Marc Salzmann; Leo J. Donner; Larry W. Horowitz; Yi Ming; Ming Zhao

2011-07-01T23:59:59.000Z

197

Modeling the Interactions between Aerosols and Liquid Water Clouds with a Self-Consistent Cloud Scheme in a General Circulation Model  

Science Conference Proceedings (OSTI)

To model aerosol–cloud interactions in general circulation models (GCMs), a prognostic cloud scheme of cloud liquid water and amount is expanded to include droplet number concentration (Nd) in a way that allows them to be calculated using the ...

Yi Ming; V. Ramaswamy; Leo J. Donner; Vaughan T. J. Phillips; Stephen A. Klein; Paul A. Ginoux; Larry W. Horowitz

2007-04-01T23:59:59.000Z

198

ASHRAE Transactions: Research 107 Commercial buildings and institutions are generally  

E-Print Network (OSTI)

ASHRAE Transactions: Research 107 ABSTRACT Commercial buildings and institutions are generally. Chiasson Jeffrey D. Spitler, Ph.D., P.E. Student Member ASHRAE Member ASHRAE Simon J. Rees, Ph.D. Marvin D. Smith, P.E. Member ASHRAE Andrew D. Chiasson is a research assistant, Jeffrey D. Spitler is a professor

199

Dynamic and Thermodynamic Influences of the Tibetan Plateau on the Atmosphere in a General Circulation Model  

Science Conference Proceedings (OSTI)

The dynamic and thermodynamic influences of the Tibetan Plateau on the temperature geopotential height, horizontal wind, vertical velocity, cloud and precipitation patterns over eastern Asia am physically investigated employing a general ...

Qinglin Zheng; Kuo-Nan Liou

1986-07-01T23:59:59.000Z

200

The Effect of Solar Tides on the General Circulation of the Martian Atmosphere  

Science Conference Proceedings (OSTI)

The mean flow accelerations induced by solar tides in the Martian atmosphere have been calculated using separable tidal theory together with the thermal excitations of Leovy and Zurek (1979). The calculated accelerations are generally small in ...

Kevin Hamilton

1982-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Adjoint Sensitivity of an Ocean General Circulation Model to Bottom Topography  

Science Conference Proceedings (OSTI)

Bottom topography, or more generally the geometry of the ocean basins, is an important ingredient in numerical ocean modeling. With the help of an adjoint model, it is shown that scalar diagnostics or objective functions in a coarse-resolution ...

Martin Losch; Patrick Heimbach

2007-02-01T23:59:59.000Z

202

Simulation of the tropical Pacific climate with a coupled ocean - atmosphere general circulation model. Part II: Interannual variability  

Science Conference Proceedings (OSTI)

Two multiyear simulations with a coupled ocean-atmosphere general circulation model (GCM)-totaling 45 years-are used to investigate interannual variability at the equator. The model consists of the UCLA global atmospheric GCM coupled to the GFDL oceanic GCM, dynamically active over the tropical Pacific. Multichannel singular spectrum analysis along the equator identifies ENSO-like quasi-biennial (QB) and quasi-quadrennial (QQ) modes. Both consist of predominantly standing oscillations in sea surface temperature and zonal wind stress that peak in the central or east Pacific, accompanied by an oscillation in equatorial thermocline depth that is characterized by a phase shift of about 90{degrees} across the basin, with west leading east. Simulated interannual variability is weaker than observed in both simulations. One of these is dominated by the QB, the other by the QQ mode, although the two differ only in details of the surface-layer parameterizations. 42 refs., 19 figs., 2 tabs.

Robertson, A.W.; Ma, C.C.; Ghil, M. [Univ. of California, Los Angeles, CA (United States)] [and others

1995-05-01T23:59:59.000Z

203

Optimal Surface Salinity Perturbations of the Meridional Overturning and Heat Transport in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Recent observations and modeling studies have stressed the influence of surface salinity perturbations on the North Atlantic circulation over the past few decades. As a step toward the estimation of the sensitivity of the thermohaline circulation ...

Florian Sévellec; Thierry Huck; Mahdi Ben Jelloul; Nicolas Grima; Jérôme Vialard; Anthony Weaver

2008-12-01T23:59:59.000Z

204

Final Report for Research Conducted at The Scripps Institution of Oceanography, University of California San Diego from 2/2002 to 8/2003 for ''Aerosol and Cloud-Field Radiative Effects in the Tropical Western Pacific: Analyses and General Circulation Model Parameterizations''  

SciTech Connect

OAK-B135 Final report from the University of California San Diego for an ongoing research project that was moved to Brookhaven National Laboratory where proposed work will be completed. The research uses measurements made by the Atmospheric Radiation Measurement (ARM) Program to quantify the effects of aerosols and clouds on the Earth's energy balance in the climatically important Tropical Western Pacific.

Vogelmann, A. M.

2004-01-27T23:59:59.000Z

205

A new method to estimate three-dimensional residual mean circulation in the middle atmosphere and its application to gravity-wave resolving general circulation model data  

Science Conference Proceedings (OSTI)

We propose a new method to estimate three-dimensional (3-d) material circulation driven by waves based on recently-derived formulas by Kinoshita and Sato that are applicable both to Rossby waves and to gravity waves. The residual mean flow is ...

Kaoru Sato; Takenari Kinoshita; Kota Okamoto

206

A study of longwave radiation codes for climate studies: Validation with ARM observations and tests in general circulation models. Technical report, 16 March 1991--15 March 1992  

SciTech Connect

Research by the US Department of Energy (DOE) has shown that cloud radiative feedback is the single most important effect determining the magnitude of possible climatic responses to human activity. However, these effects are still not known at the levels needed for climate prediction. Consequently, DOE has launched a major initiative-- the Atmospheric Radiation Measurements (ARM) Program -- directed at improving the parameterization of the physics governing cloud and radiative processes in general circulation models (GCM`s). One specific goal of ARM is to improve the treatment of radiative transfer in GCM`s under clear-sky, general overcast and broken cloud conditions. Our approach to developing the radiation model will be to test existing models in an iterative, predictive fashion. We will supply the Clouds and Radiative Testbed (CART) with a set of models to be compared with operationally observed data. The differences we find will lead to the development of new models to be tested with new data. Similarly, our GCM studies will use existing GCM`s to study the radiation sensitivity problem. We anticipate that the outcome of this approach will provide both a better longwave radiative forcing algorithm and a better understanding of how longwave radiative forcing influences the equilibrium climate of the atmosphere.

Ellingson, R.G.; Baer, F.

1992-06-01T23:59:59.000Z

207

Four-dimensional variational data assimilation experiments with a multilevel semi-Lagrangian semi-implicit general circulation model  

Science Conference Proceedings (OSTI)

Four-dimensional variational data assimilation (VDA) experiments have been carried out using the adiabatic version of the NASA/Goddard Laboratory for Atmospheres semi-Lagrangian semi-implicit (SLSI) multilevel general circulation model. The limited-memory quasi-Newton minimization technique was used to find the minimum of the cost function. With model-generated observations, different first-guess initial conditions were used to carry out the experiments. The experiments included randomly perturbed initial conditions, as well as different weight matrices in the cost function. The results show that 4D VDA works well with with various initial conditions as control variables. Scaling the gradient of the cost function proves to be an effective method of improving the convergence rate of the VDA minimization process. The impacts of the length of the assimilation interval and the time density of the observations on the convergence rate of the minimization have also been investigated. An improved assimilation was obtained when observations were available in selected segments of the assimilation window. Moreover, our 4D VDA experiments with the SLSI model confirm results obtained concerning the impact of the length of the assimilation window. The choice of an adequate time distribution of observations along with an appropriate length of assimilation interval is an important issue that will be further investigated. 44 refs., 17 figs., 1 tab.

Li, Yong; Bates, J.R.; Moorthi, S.; Higgens, R.W. (NASA/Goddard Lab. for Atmospheres, Greenbelt, MD (United States)); Navon, I.M.; Yang, Weiyu; Zou, Xiaolei (Florida State Univ., Tallahassee, FL (United States))

1994-05-01T23:59:59.000Z

208

The Balance of Kinetic and Total Energy Simulated by the OSU Two-Level Atmospheric General Circulation Model for January and July  

Science Conference Proceedings (OSTI)

The horizontal structure of the balances of kinetic energy and total energy simulated by the Oregon State University (OSU) two-level atmospheric general circulation model are studied for January and July on the basis of a three-year simulation ...

Jough-Tai Wang; Jeong-Woo Kim; W. Lawrence Gates

1984-05-01T23:59:59.000Z

209

A Series of Zonal Jets Embedded in the Broad Zonal Flows in the Pacific Obtained in Eddy-Permitting Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

A series of zonal currents in the Pacific Ocean is investigated using eddy-permitting ocean general circulation models. The zonal currents in the subsurface are classified into two parts: one is a series of broad zonal flows that has the ...

Hideyuki Nakano; Hiroyasu Hasumi

2005-04-01T23:59:59.000Z

210

On the Dynamics of Droughts in Northeast Brazil: Observations, Theory and Numerical Experiments with a General Circulation Model  

Science Conference Proceedings (OSTI)

It is proposed that a possible mechanism for the occurrence of severe droughts over northeast Brazil is the establishment of a thermally direct local circulation which has its ascending branch at about 10°N and its descending branch over ...

Antonio D. Moura; Jagadish Shukla

1981-12-01T23:59:59.000Z

211

Initial Testing of a Massively Parallel Ensemble Kalman Filter with the Poseidon Isopycnal Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A multivariate ensemble Kalman filter (MvEnKF) implemented on a massively parallel computer architecture has been developed for the Poseidon ocean circulation model and tested with a Pacific basin model configuration. There are about 2 million ...

Christian L. Keppenne; Michele M. Rienecker

2002-12-01T23:59:59.000Z

212

Wind-Generated Power Input to the Deep Ocean: An Estimate Using a 1/10° General Circulation Model  

Science Conference Proceedings (OSTI)

Recent studies on the wind-generated power input to the geostrophic and nongeostrophic ocean circulation components have used expressions derived from Ekman dynamics. The present work extends and unifies previous studies by deriving an expression ...

Jin-Song von Storch; Hideharu Sasaki; Jochem Marotzke

2007-03-01T23:59:59.000Z

213

The Effect of Orographically Excited Gravity Wave Drag on the General Circulation of the Lower Stratosphere and Troposphere  

Science Conference Proceedings (OSTI)

The influence of large-scale momentum sinks, due to breaking of orographically excited gravity waves, on the Northern Hemisphere wintertime circulation of the troposphere and lower stratosphere is examined by introducing a simple wave drag ...

N. A. McFarlane

1987-07-01T23:59:59.000Z

214

The Research and Application of AGC in Circulating Fluidized Bed Unit  

Science Conference Proceedings (OSTI)

The circulating fluidized bed boiler (CFB) powerunit with its energy-saving and environmental protection hasbroad application prospects, but the problem of CFB unitautomatic control has not been solved satisfied, so automaticgeneration control (AGC) ... Keywords: CFB, AGC, power, main steam pressure, main steam temperature, bed temperature

Xin Xiaogang, Zhou Peng, Yang Chunxia, Guo Xiaohong, Wang Biao, Wang Yijun, Yu Jinglong

2012-07-01T23:59:59.000Z

215

Lost Circulation Experience in Geothermal Wells  

DOE Green Energy (OSTI)

Lost circulation during drilling and cementing in geothermal wells is a problem common to most geothermal areas. Material and rig time costs due to lost circulation often represent one fourth or more of the total well cost. Assessment of the general drilling and completion practices commonly used for handling lost circulation have been surveyed and evaluated under a study sponsored by Sandia National Laboratories. Results of this study, including interviews with geothermal production companies and with drilling fluid service companies, are reported in the paper. Conclusions and recommendations are presented for control of lost circulation during geothermal operations. Recent improvements in lost circulation materials and techniques and potential equipment solutions to the lost circulation problem are discussed. Research needs are also identified.

Goodman, M. A.

1981-01-01T23:59:59.000Z

216

Wind Effects on the Buoyancy-Driven General Circulation in a Closed Basin Using a Two-Level Model  

Science Conference Proceedings (OSTI)

Wind effects on buoyancy-driven circulation in a two-level rectangular basin are studied. The ocean is driven by positive and negative buoyancy fluxes in the northern and southern portions as well as wind stress of constant curl. In a model with ...

M. Ikeda

1987-10-01T23:59:59.000Z

217

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).  

Science Conference Proceedings (OSTI)

An experimental program was conducted to study the multiphase gas-solid flow in a pilot-scale circulating fluidized bed (CFB). This report describes the CFB experimental facility assembled for this program, the diagnostics developed and/or applied to make measurements in the riser section of the CFB, and the data acquired for several different flow conditions. Primary data acquired included pressures around the flow loop and solids loadings at selected locations in the riser. Tomographic techniques using gamma radiation and electrical capacitance were used to determine radial profiles of solids volume fraction in the riser, and axial profiles of the integrated solids volume fraction were produced. Computer Aided Radioactive Particle Tracking was used to measure solids velocities, fluxes, and residence time distributions. In addition, a series of computational fluid dynamics simulations was performed using the commercial code Arenaflow{trademark}.

Oelfke, John Barry; Torczynski, John Robert; O'Hern, Timothy John; Tortora, Paul Richard; Bhusarapu, Satish (; ); Trujillo, Steven Mathew

2006-08-01T23:59:59.000Z

218

Lost circulation in geothermal wells: survey and evaluation of industry experience  

DOE Green Energy (OSTI)

Lost circulation during drilling and completion of geothermal wells can be a severe problem, particularly in naturally fractured and/or vugular formations. Geothermal and petroleum operators, drilling service companies, and independent consultants were interviewed to assess the lost circulation problem in geothermal wells and to determine general practices for preventing lost circulation. This report documents the results and conclusions from the interviews and presents recommendations for needed research. In addition, a survey was also made of the lost circulation literature, of currently available lost circulation materials, and of existing lost circulation test equipment.

Goodman, M.A.

1981-07-01T23:59:59.000Z

219

A Spectral General Circulation Model Using a Piecewise-Constant Finite-Element Representation on a Hybrid Vertical Coordinate System  

Science Conference Proceedings (OSTI)

A numerical scheme for the vertical discretization of primitive equations in a generalized pressure-type coordinate is developed through application of the Galerkin formalism with piecewise-constant finite elements: this methodology affords an ...

René Laprise; Claude Girard

1990-01-01T23:59:59.000Z

220

Using Different Formulations of the Transformed Eulerian Mean Equations and Eliassen–Palm Diagnostics in General Circulation Models  

Science Conference Proceedings (OSTI)

Transformed Eulerian mean (TEM) equations and Eliassen–Palm (EP) flux diagnostics are presented for the general nonhydrostatic, fully compressible, deep atmosphere formulation of the primitive equations in spherical geometric coordinates. The TEM ...

Steven C. Hardiman; David G. Andrews; Andy A. White; Neal Butchart; Ian Edmond

2010-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Low Wind Speed Technology Phase II: Integrated Wind Energy/Desalination System; General Electric Global Research  

SciTech Connect

This fact sheet describes a subcontract with General Electric Global Research to explore wind power as a desirable option for integration with desalination technologies.

Not Available

2006-03-01T23:59:59.000Z

222

A Study of Persistence in the Land–Atmosphere System Using a General Circulation Model and Observations  

Science Conference Proceedings (OSTI)

Persistence in the land–atmosphere system simulated with the National Center for Atmosphere Research Community Climate Model Version 2 (CCM2) coupled with the Biosphere–Atmosphere Transfer Scheme (BATS) is examined. BATS simulates various ...

Yongqiang Liu; Roni Avissar

1999-08-01T23:59:59.000Z

223

The University of Texas at Arlington Research Institute Lieutenant General, US Army (Retired)  

E-Print Network (OSTI)

The University of Texas at Arlington Research Institute UTARI Rick Lynch Lieutenant General, US of Texas at Arlington Research Institute Vision Statement By 2017, UTARI becomes a global leader of Texas at Arlington Research Institute Mission Statement UTARI bridges the gap between academic research

Texas at Arlington, University of

224

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

CENTER CENTER (GEGRC) FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN RIGHTS TO INVENTIONS MADE UNDER COOPERATIVE AGREEMENT NUMBER DE-FC04-02AL68284, DOE WAIVER NO. W(A) 03-039. The Petitioner, GEGRC, has requested a waiver of all domestic and foreign patent rights to inventions that may be conceived or first actually reduced to practice in the course of GEGR's work under Cooperative Agreement Number DE-FC04-02AL68284 entitled " 2 1 st Century Locomotive" with the U.S. Department of Energy (DOE). The work to be done will be the design and development of fuel injectors, turbochargers and locomotive systems technologies to increase fuel efficiency and decrease exhaust gases in freight and passenger locomotives. Successful research and development under this agreement will lead to more energy efficient locomotives and reduced fuel

225

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH (GEGR)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(GEGR) (GEGR) FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN RIGHTS TO INVENTIONS MADE UNDER COOPERATIVE AGREEMENT NUMBER DE-FC04-01AL67614, DOE WAIVER NO. W(A) 02-016. The Petitioner, GEGR, formerly known as GE Energy and Environmental Research Corporation, has requested a waiver of all domestic and foreign patent rights to inventions that GEGR may conceive or first actually reduce to practice in the course of GEGR's work under Cooperative Agreement Number DE-FC04-01AL67614 entitled "Autothermal Cyclic Reforming Based Hydrogen Refueling System" with the U.S. Department of Energy (DOE). This waiver will not cover the inventions of subcontractors to GEGR. The work to be done will be the design, development and manufacture of a reliable autothermal cyclic reformer (ACR)-based hydrogen fueling system. This work is

226

A study of longwave radiation codes for climate studies: Validation with ARM observations and tests in general circulation models. Technical report, 15 September 1990--25 April 1993  

SciTech Connect

This report summarizes the activities of our group to meet our stated objectives. The report is divided into sections entitled: Radiation Model Testing Activities, General Circulation Model Testing Activities, Science Team Activities, and Publications, Presentations and Meetings. The section on Science Team Activities summarizes our participation with the science team to further advance the observation and modeling programs. Appendix A lists graduate students supported, and post-doctoral appointments during the project. Reports on the activities during each of the first two years are included as Appendix B. Significant progress has been made in: determining the ability of line-by-line radiation models to calculate the downward longwave flux at the surface; determining the uncertainties in calculated the downwelling radiance and flux at the surface associated with the use of different proposed profiling techniques; intercomparing clear-sky radiance and flux observations with calculations from radiation codes from different climate models; determining the uncertainties associated with estimating N* from surface longwave flux observations; and determining the sensitivity of model calculations to different formulations of the effects of finite sized clouds.

Ellingson, R.G.; Baer, F.

1993-12-31T23:59:59.000Z

227

Monsoons as eddy-mediated regime transitions of the tropical overturning circulation  

E-Print Network (OSTI)

Monsoons as eddy-mediated regime transitions of the tropical overturning circulation Simona Bordoni National Center for Atmospheric Research, Boulder, Colorado, USA Monsoons are generally viewed as planetary with the seasons, the onset of monsoon precipitation is rapid and accompanied by rapid circulation changes

Heaton, Thomas H.

228

Spectral Analysis and Diagnosis of Nonlinear Interactions of Large-Scale Moving Waves at 200 mb in the GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

Wavenumber-frequency spectral analysis of a 90-day winter (15 January - 15 April) wind field simulated by a climate experiment of the GLAS (Goddard laboratory for Atmospheric Sciences) atmospheric circulation model is made using the space-time ...

Tsing-Chang Chen; Hal G. Marshall; J. Shukla

1981-05-01T23:59:59.000Z

229

Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents  

E-Print Network (OSTI)

Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in flow speeds of marine ice sheets around Antarctica. ...

Dansereau, Véronique

2012-01-01T23:59:59.000Z

230

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC COMPANY-CORPORATE RESEARCH  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

COMPANY-CORPORATE RESEARCH COMPANY-CORPORATE RESEARCH AND DEVELOPMENT, FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN INVENTION RIGHTS UNDER ITS SUBCONTRACT WITH EG&G IDAHO, INC., NO. EGG-C92-120319, UNDER CONTRACT NO. DE-AC07-76ID01570 - W(A)-93-012 CH-0762 Under this subcontract with EG&G Idaho, Inc. (EG&G), General Electric Company - Corporate Research and Development (GE-CRD) is to assess the design of the power electronics and control for an advanced electric vehicle driveline that utilizes ultracapacitors for load leveling the main storage battery and decouples the maximum capacitor, nominal battery pack, and driveline system voltages, and to compare the weight, volume, cost, and performance of such systems with that of the MEVP AC driveline. The study will evaluate on paper the design possibilities for the advanced

231

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ITS ITS SUBCONTRACT WITH DELPHI AUTOMTIVIE SYSTEMS UNDER COOPERATIVE AGREEMENT DE-FC26-07NT 43121; W(A)-09-012 ; CH-1475 General Electric Global Research Center (GE-GRC), requests an advance waiver of domestic and foreign patent tights for all subject inventions made under the above subcontract. Under the cooperative agreement, Delphi is leading a teaming arrangement that includes General Electric. Delphi has applied for an advance waiver for its own inventions (W(A)-07-030). The purpose of the cooperative agreement is to develop, test and demonstrate a cost- effective, compact, lightweight, and scalable high temperature propulsion inverter for Hybrid Electric Vehicles (HEV), Plug-in Hybrid Electric Vehicles (PHEV), and Fuel Cell Vehicles (FCV). For this

232

Categorical Exclusion Determination Form Proposed Action Title: (0672-1502) General Electric Global Research (GE) -  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

'Department of Energy 'Department of Energy Categorical Exclusion Determination Form Proposed Action Title: (0672-1502) General Electric Global Research (GE) - Chilled Natural Gas for At-Home Refueling Program or Field Office: Advanced Research Projects Agency - Energy LocationCs) CCity/County/State): Niskayuna, NY; Troy, NY; Columbia, MO Proposed Action Description: Funding will support efforts to develop a compressor technology for at-home refueling of natural gas vehicles. Proposed work will consist of: (1) development, synthesis, and testing of small quantities of adsorbent material at a dedicated laboratory facility on the University of Missouri campus in Columbia, MO; (2) design, fabrication (or procurement), and testing of compressor system components, including a cryocooler and an accumulator, at Chart Industries, Inc.'s commercial development and assembly site in Troy, NY; and (3) assembly

233

REQUEST BY GENERAL ELECTRIC COMPANY, CORPORATE RESEARCH AND DEVELOPMENT, FOR AN ADVANCE WAIVER OF  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

COMPANY, CORPORATE COMPANY, CORPORATE RESEARCH AND DEVELOPMENT, FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN RIGHTS IN SUBJECT INVENTIONS MADE IN THE COURSE OF OR UNDER DEPARTMENT OF ENERGY CONTRACT NO. DE-AC21-92MC29110; DOE WAIVER DOCKET W(A)-93-011, [ORO-551] General Electric Company, Corporate Research and Development (GE-CRD) has made a timely request for an advance waiver to worldwide rights in Subject Inventions made in the course of or under Department of Energy (DOE) Contract No. DE-AC21-92MC29110. The scope of the work calls for the development of a low-cost method for sorption and destruction of chlorinated volatile organic compound (CVOC) vapors using recyclable organic polymers and biodegradation. The work is sponsored by the Office of Fossil Energy. The dollar amount of the contract is $627,560 with GE-CRD cost sharing

234

The University of Texas at Dallas Advanced Network Research Labs 1 Generalized Burst Assembly and Scheduling Techniques for  

E-Print Network (OSTI)

The University of Texas at Dallas Advanced Network Research Labs 1 Generalized Burst Assembly Jason P. Jue, and Biao Chen Advanced Network Research Labs The University of Texas at Dallas, USA #12;The University of Texas at Dallas Advanced Network Research Labs 2 Outline · Optical Burst Switching

Vokkarane, Vinod M.

235

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

7514 7514 W(A)-2012-004; CH-1650 General Electric Global Research Center (GE-GRC), requests an advance waiver of domestic and foreign patent rights for all subject inventions made under the above cooperative agreement for work entitled, "High Performance Thin Film Composite Hollow Fiber Membranes for Post-Combustion C0 2 Capture." The purpose of the cooperative agreement is the investigation of the technical and economic feasibility of developing novel thin film composite hollow fiber membranes for post combustion carbon capture. Key deliverables include developing C02 selective polymeric material , hollow fiber supports and coating processes to demonstrate a thin film composite HF membrane to achieve 90% C02 capture efficiency with less than 35% increase in the

236

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

68; W{A)-09-025; CH-1490 68; W{A)-09-025; CH-1490 General· Electric Global Research Center (GE-GRC), requests an advance waiver of domestic and foreign patent tights for all subject inventions made under the above cooperative agreement for work entitled, "Fuel Flexible Combustion Systems for High-Efficiency Utilization of Opportunity Fuels in Gas Turbines." The purpose of the cooperative agreement is to define, develop, and test new fuel nozzle technology concepts for gas turbine operation on a wide spectrum of opportunity fuels and/or fuel blends. Successful technology concepts will be developed and tested through full pressure, full temperature single nozzle component combustion testing. This waiver is for inventions of GE-GRC only. The work under this subcontract is expected to take place from October 1, 2008

237

REQUEST BY GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT (GE) FOR AN ADVANCE WAIVER OF DOMESTIC AND  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

4 4 Statement of Considerations REQUEST BY GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT (GE) FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN PATENT RIGHTS TO INVENTIONS MADE UNDER CONTRACT NO. DE-FC26-00NT40993 ENTITLED "VARIABLE SPEED INTEGRATED INTELLIGENT BLOWER FOR HIGH EFFICIENCY HEATING VENTILATION AND AIR CONDITIONING"; W(A)-01-019, CH1066. GE has requested an advance waiver of domestic and foreign patent rights to inventions its employees may conceive or first actually reduce to practice in the performance of Contract No. DE-FC26-00NT40993. As brought out in the attached waiver petition, the scope of work includes the development and marketing of an Electronically Cormutated Motor (ECM) and fan combination. The combination utilizes a common rotating shaft and integral cooling and advanced blower fan

238

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH FOR AN ADVANCE WAIVER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

FC26-08NT01579; W(A)-09-036, CH-1501 The Petitioner, General Electric Global Research (GE), was awarded this cooperative agreement for the performance of work entitled , "High-Efficiency Sold-State Downlight Luminaries with Novel Cooling". According to its response to question 2, G E states that this program will develop novel synthetic jet cooling technology for cooling LED luminaries. In addition to synthetic jet technology, driver electronics , light engine , optical design , and fixture will be designed and demonstrated. This waiver is only for inventions of GE made under the cooperative agreement. The total estimated cost of the contract is $2 ,886 ,040 with GE providing a 25% cost-share or $721 ,510. DOE is providing the remaining 75% share of $2,164,530. The period of

239

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH FOR AN ADVANCE WAIVER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

NT0005310; W(A)-09-048, CH-1511 The Petitioner, General Electric Global Research (GE) was awarded this cooperative agreement for the performance of work entitled, "Novel High Capacity Oligomers for Low Cost C02 Capture." According to its response to question 2, GE states that it will investigate the technical and economic feasibility of developing novel oligomeric silicone solvents for C02 capture. Key deliverable include identifying a group of solvents that have been demonstrated to have a C02 capacity of at least 25% greater than aqueous monoethanolamine (MEA), and are predicted to achieve 90% C 0 2 capture efficiency and less than a 50% increase in COE (with the potential to achieve less than a 35% increase in COE with further optimization.). Other

240

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

71 71 2; W(A)-2011-067 ; CH-1639 General Electric Global Research Center (GE-GRC) requests an advance waiver of domestic and foreign patent rights for all subject inventions made under the above cooperative agreement for work entitled, "Model Based Optimal Sensor Network Design for Condition Monitoring in an IGCC Plant". The purpose of the cooperative agreement is to develop a systematic model-based approach for addressing the problem of optimal sensor placement (OSP) in a sensor network used for condition monitoring of key process equipment in an IGCC plant , namely, gasifier refractory lining and RSC fouling . This waiver is for inventions of GE-GRC on ly. The work under this cooperative agreement is expected to take place from August 20, 2010 through December 30, 2012, at a total cost of $1

Note: This page contains sample records for the topic "research general circulation" 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

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

AND DEVELOPMENT AND DEVELOPMENT FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN INVENTION RIGHTS UNDER DOE COOPERATIVE AGREEMENT NO. DE-FC26-01NT41261 W(A)-02-002, CH-1086 The Petitioner, General Electric Corporate Research and Development (GE-CRD), was awarded this cooperative agreement for the performance of work entitled, "Systems Approach to an Energy Efficient Laundry Process". The purpose of the cooperative agreement is accomplish substantial energy savings in the laundry process by focusing on a total integrated systems approach involving: extraction of more water during spin in the washing machine; improving the drying efficiency of the dryer; and, investigating the possibility of impacting drying time through laundry product chemistry. The total estimated cost of the cooperative agreement is $2,599,635 with the DOE share

242

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

6560; W(A)-09-026; CH-1491 6560; W(A)-09-026; CH-1491 General Electric Global Research Center (GE-GRC), requests an advance waiver of domestic and foreign patent rights for all subject inventions made under the above cooperative agreement for work entitled, "Clean and Efficient Diesel Engine." The purpose of the cooperative agreement is to develop clean and efficient diesel engine technology. The program aims to enhance the efficiency of large displacement (>10 liters/cylinder), medium speed «1200 rev/min) diesel engines that are used in locomotive. marine, and power generation applications. This waiver is for inventions of GE-GRC only. The work under this subcontract is expected to take place from October 1, 2008 through September 30, 2009, at a total cost of $1 ,230,000. GE-GRC will provide 20% cost share or

243

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

70 70 W(A)-2011-068 ; CH-1640 General Electric Global Research Center (GE-GRC) requests an advance waiver of domestic and foreign patent rights for all subject inventions made under the above cooperative agreement for work entitled, "Flexible Distributed Energy & Water from Waste for Food and Beverage Industry". The purpose of the cooperative agreement is the development of an online monitoring and supervisory control technology for treatment of food & beverage industrial wastewater th rough anaerobic digestion and/or aerobic bioprocess, to recover biogas and treated effl uent water. The developed monitoring and control technology will include implementation of online sensors, use of dynamic model of the bioprocess for model-based estimation of un-measured variables

244

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH CENTER FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

859; W(A)-2012-015 859; W(A)-2012-015 ; CH-1654 General Electric Global Research Center (GE-GRC or GE), requests an advance waiver of domestic and foreign patent rights for all subject inventions made under the above cooperative agreement for work entitled , "Modeling Creep Fatigue Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultra Supercritical Coal Power Plants". Under this agreement, GE will model creep-fatigue-environment interactions in steam turbi ne rotor materials for adva nced ultra supercritical (A-USC) coal power plants, to develop and demonstrate computational algorithms for alloy property predictions , and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions. The technology developed

245

Fusion research at General Atomics annual report, October 1, 1993-- September 30, 1994  

SciTech Connect

In FY94, the General Atomics (GA) Fusion Group made significant contributions to the technology needs of the controlled fusion power program. The work was supported by the Office of Fusion Energy, Advanced Physics and Technology Division and ITER and Technology Division, of the US Department of Energy. The work is reported in the following sections on Fusion Power Plant Studies, Plasma Interactive Materials, RF Technology, and Diagnostics. Meetings attended and publications are listed in their respective sections. The overall objective of GA`s fusion technology research is to develop the technologies necessary for fusion to move successfully from present-day physics experiments to the next-generation fusion reactor experiments, Tokamak Physics Experiment (TPX) and ITER, and ultimately to fusion power plants. To achieve this overall objective, we carry out fusion systems design studies to evaluate the technologies needed for next-step experiments and power reactors, and we conduct research to develop basic knowledge about these technologies, including plasma technologies, fusion nuclear technologies, and fusion materials. We continue to be committed to the development of fusion power and its commercialization by US industry.

1995-11-01T23:59:59.000Z

246

Effects of Penetrative Radiation on the Upper Tropical Ocean Circulation  

Science Conference Proceedings (OSTI)

The effects of penetrative radiation on the upper tropical ocean circulation have been investigated with an ocean general circulation model (OGCM) with attenuation depths derived from remotely sensed ocean color data. The OGCM is a reduced ...

Raghu Murtugudde; James Beauchamp; Charles R. McClain; Marlon Lewis; Antonio J. Busalacchi

2002-03-01T23:59:59.000Z

247

Optimal excitation of interannual atlantic meridional overturning circulation variability  

E-Print Network (OSTI)

The optimal excitation of Atlantic meridional overturning circulation (MOC) anomalies is investigated in an ocean general circulation model with an idealized configuration. The optimal three-dimensional spatial structure ...

Zanna, Laure

248

Multiple Oscillatory Modes of the Global Ocean Circulation  

Science Conference Proceedings (OSTI)

For the first time, the (linear) stability of the global ocean circulation has been determined explicitly. In a low-resolution general circulation model, a steady state is computed directly by solving the elliptic boundary value problem. The ...

Wilbert Weijer; Henk A. Dijkstra

2003-11-01T23:59:59.000Z

249

Hadley Circulation Response to Orbital Precession. Part I: Aquaplanets  

Science Conference Proceedings (OSTI)

The response of the monsoonal and annual-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general circulation model with an aquaplanet slab-ocean lower boundary. Contrary to expectations, the simulated ...

Timothy M. Merlis; Tapio Schneider; Simona Bordoni; Ian Eisenman

2013-02-01T23:59:59.000Z

250

Hadley Circulation Response to Orbital Precession. Part II: Subtropical Continent  

Science Conference Proceedings (OSTI)

The response of the monsoonal and annual-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general circulation model with a simplified representation of land surface processes in subtropical latitudes. When ...

Timothy M. Merlis; Tapio Schneider; Simona Bordoni; Ian Eisenman

2013-02-01T23:59:59.000Z

251

Energetics of a Symmetric Circulation Including Momentum Constraints  

Science Conference Proceedings (OSTI)

A theory of available potential energy (APE) for symmetric circulations, which includes momentum constraints, is presented. The theory is a generalization of the classical theory of APE, which includes only thermal constraints on the circulation. ...

Sorin Codoban; Theodore G. Shepherd

2003-08-01T23:59:59.000Z

252

Interhemispheric Thermohaline Circulation in a Coupled Box Model  

Science Conference Proceedings (OSTI)

The interhemispheric thermohaline circulation is examined using Rooth’s three-box ocean model, whereby overturning strength is parameterized from density differences between high-latitude boxes. Recent results with general circulation models ...

Jeffery R. Scott; Jochem Marotzke; Peter H. Stone

1999-03-01T23:59:59.000Z

253

Simulations of Persistent North Pacific Circulation Anomalies and Interhemispheric Teleconnections  

Science Conference Proceedings (OSTI)

Evidence is presented from a composite analysis of a 14-year general circulation model simulation, that persistent North Pacific (PNP) circulation anomalies during boreal winter are part of a larger-scale meridional development extending into the ...

R. W. Higgins; S. D. Schubert

1996-01-01T23:59:59.000Z

254

The Energetics of Global Thermohaline Circulation and Its Wind Enhancement  

Science Conference Proceedings (OSTI)

The energy budget of global thermohaline circulation (THC) is numerically investigated using an ocean general circulation model (OGCM) under a realistic configuration. Earlier studies just discuss a globally integrated energy budget. This study ...

L. Shogo Urakawa; Hiroyasu Hasumi

2009-07-01T23:59:59.000Z

255

Method for Determining Solids Circulation Rate  

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

Determining Solids Circulation Rate Determining Solids Circulation Rate Contact NETL Technology Transfer Group techtransfer@netl.doe.gov May 2012 Opportunity Research is currently active on the patented technology "Method for Determining Solids Circulation Rate." The technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Overview This invention provides a method to measure the rate of solids circulation, particularly in those applications where the solids are recycled back to pro- cesses for further use. The applications include processes such as circulating fluidized bed gasifiers and combustors, as well as chemical looping. In the above applications, determining solids circulation rates is needed to

256

Changes in Zonal Surface Temperature Gradients and Walker Circulations in a Wide Range of Climates  

Science Conference Proceedings (OSTI)

Variations in zonal surface temperature gradients and zonally asymmetric tropical overturning circulations (Walker circulations) are examined over a wide range of climates simulated with an idealized atmospheric general circulation model (GCM). ...

Timothy M. Merlis; Tapio Schneider

2011-09-01T23:59:59.000Z

257

Atlantic Dominance of the Meridional Overturning Circulation  

Science Conference Proceedings (OSTI)

North Atlantic (NA) deep-water formation and the resulting Atlantic meridional overturning cell is generally regarded as the primary feature of the global overturning circulation and is believed to be a result of the geometry of the continents. ...

A. M. de Boer; J. R. Toggweiler; D. M. Sigman

2008-02-01T23:59:59.000Z

258

Posters Comparison Between General Circulation Model Simulation...  

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

triangulation interpolation. For the GCM simulation, the monthly mean surface latent heat flux is sampled at the grid points closest to the buoy sites, then interpolated the...

259

Research Highlight  

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

(ARM) Program, the CCCP-ARM Parameterization Testbed, or CAPT, is a diagnostic tool for evaluating general circulation models (GCMs) using weather prediction techniques....

260

STATEMENT OF CONSIDERATIONS REQUEST BY GENERAL ELECTRIC GLOBAL RESEARCH, INC (GE) FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

RESEARCH, INC (GE) FOR AN RESEARCH, INC (GE) FOR AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN PATENT RIGHTS UNDER DOE AWARD NO. DE-EE0005344; W(A) 2011-072 GE has requested a waiver of domestic and foreign patent rights of the United States of America in all subject inventions arising from its participation under the above referenced cooperative agreement entitled "Module Embedded Microinverter Smart Grid Ready Residential Solar Electric System." The cooperative agreement was made under the Solar Energy Grid Integration Systems - Advanced Concepts (SEGIS-AC) Funding Opportunity Announcement (DE-FOA-0000479). The objectives of SEGIS-AC are to support the development and demonstration of technologies in power electronics that reduce the overall PV system costs, allow high penetrations of solar

Note: This page contains sample records for the topic "research general circulation" 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

General-Purpose Heat Source: Research and development program: Cold-Process Verification Test Series  

SciTech Connect

The General-Purpose Heat Source (GPHS) provides power for space missions by transmitting the heat of {sup 238}Pu decay to an array of thermoelectric elements. Because any space mission could experience a launch abort or return from orbit, the heat source must be designed and constructed to survive credible accident environments. Previous testing conducted in support of the Galileo and Ulysses missions documented the response of GPHSs and individual GPHS capsules fueled with {sup 238}UO{sub 2} ({sup 235}U-depleted) to a variety of explosive overpressure and impact events. In the early 1990s, Los Alamos National Laboratory (LANL) resumed fabrication of {sup 238}UO{sub 2} GPHS pellets. The Cold-Process Verification (CPV) Test Series was designed to compare the response of GPHS heat sources loaded with recently fabricated hot- and cold-pressed {sup 238}UO{sub 2} pellets to the response of urania pellets used in the Galileo and Ulysses performance tests. This report documents eleven bare-capsule impacts and one impact of a fully loaded GPHS module. All of the failures observed in the bare-clad impact tests were similar to failures observed in previous safety tests. No failures occurred in the module impact test.

Reimus, M.A.H.; George, T.G.

1996-06-01T23:59:59.000Z

262

General-purpose heat source: Research and development program. Process evaluation, fuel pellet GF-47  

DOE Green Energy (OSTI)

The general-purpose heat source (GPHS) provides power for space missions by transmitting the heat of {sup 238}Pu decay to an array of thermoelectric elements. Because the potential for a launch abort or return from orbit exists for any space mission, the heat source must be designed and constructed to survive credible accident environments. Previous testing conducted in support of the Galileo and Ulysses missions has documented the response of the GPHS heat source to a variety of fragment-impact, aging, atmospheric reentry, and Earth-impact conditions. Although heat sources for previous missions were fabricated by the Westinghouse Savannah River Company (WSRC), GPHS fueled-clads required for the Cassini mission to Saturn will be fabricated by Los Alamos National Laboratory (LANL). This evaluation is part of an ongoing program to determine the similarity of GPHS fueled clads and fuel pellets fabricated at LANL to those fabricated at WSRC. Pellet GF-47, which was fabricated at LANL in late 1994, was submitted for chemical and ceramographic analysis. The results indicated that the pellet had a chemical makeup and microstructure within the range of material fabricated at WSRC in the early 1980s.

Reimus, M.A.H.; George, T.G.

1995-12-01T23:59:59.000Z

263

Solar energy research and development: program balance. Review by the solar working group (formerly the General Advisory Committee)  

SciTech Connect

The program balance for solar energy is reviewed by key issues, methodology, and findings. The findings are summarized for solar heating and cooling, agricultural and industrial process heat, wind, ocean thermal energy conversion, photovoltaic, solar thermal electric, biomass, basic research, and centralized/decentralized applications. It is concluded that increased emphasis is warranted on some biomass technologies, on thin film photovoltaics, and on basic research. A decreased emphasis is indicated for OTEC, for single-crystal silicon and concentrator photovoltaics, and for solar thermal demonstrations other than Barstow. In general the heating/cooling of buildings and the wind programs are balanced and justified by their promise, except that demonstrations of cooling should be deferred. (MHR)

1978-02-01T23:59:59.000Z

264

Regional Climates in the GISS Global Circulation Model: Synoptic-Scale Circulation  

Science Conference Proceedings (OSTI)

Model simulations of global climate change are seen as an essential component of any program at understanding human impact on the global environment. A major weakness of current general circulation models (GCMs), however, is their perceived ...

B. Hewitson; R. G. Crane

1992-09-01T23:59:59.000Z

265

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Reversing the Circulation of Magnetic Vortices Reversing the Circulation of Magnetic Vortices Print Wednesday, 31 July 2013 00:00 In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

266

Panel: Microgrid Research and Field Testing IEEE PES General Meeting, 24-28 June 2007, Tampa, FL 1 In general, a microgrid can operate in both the grid-connected  

E-Print Network (OSTI)

Panel: Microgrid Research and Field Testing IEEE PES General Meeting, 24-28 June 2007, Tampa, FL 1 Abstract In general, a microgrid can operate in both the grid-connected mode and the islanded mode where the microgrid is interfaced to the main power system by a fast semiconductor switch called static switch, (SS

267

Research Highlight  

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

General Formulation for Representing Cloud-to-Rain Transition in General Formulation for Representing Cloud-to-Rain Transition in Atmospheric Models Submitter: Liu, Y., Brookhaven National Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Aerosol, Cloud Modeling, Cloud Properties Journal Reference: Liu, Y., P. H. Daum, R. McGraw, M. Miller, and S. Niu, 2007: Theoretical formulation for autoconversion rate of cloud droplet concentration. Geophys. Res. Lett., 34, L116821, doi:10.1029/2007GL030389 Figure 1. The typical drop radius r* as a function of the volume-mean radius r3 derived from the new theoretical formulation. Note that a constant r* corresponds to the commonly used assumption that the autoconversion rate for droplet concentration is linearly proportional to

268

Heat transfer research in General Electric, 1910-1960; Examples of the product-driven innovation cycle  

SciTech Connect

General Electric has a long and varied history of doing research on heat transfer, and using the results in its products and processes. Lessons it has learned during the half-century from 1910 to 1950 suggest a need for revision in the standard models used by economists to describe the way industry generates new technology and uses it to achieve innovations. The generation of new technology or the better use of old technology begins, not with a demand from the marketplace or a push from research, but from consideration of an already existing product. Problems or opportunities involving that product drive engineers or scientists to search for new knowledge. That knowledge proves useful in the development of a product, perhaps the one that initiated the search for knowledge, or perhaps a very different one. The important point is that however esoteric or mundane is the research in the middle of the cycle, the beginning and end are always products (or the processes used to make products), not scientists' ideas or customers demands.

Wise, G. (General Electric R and D Center, Schenectady, NY (US))

1991-01-01T23:59:59.000Z

269

Research Highlight  

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

Parameterizing the Ice Fall Speed in Climate Models: Results from TC4 and Parameterizing the Ice Fall Speed in Climate Models: Results from TC4 and ISDAC Download a printable PDF Submitter: Mitchell, D. L., Desert Research Institute Mishra, S., NOAA - Coop. Inst. for Mesoscale Meteorological Studies Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle, Cloud-Aerosol-Precipitation Interactions Journal Reference: Mitchell DL, S Mishra, and RP Lawson. 2011. "Representing the ice fall speed in climate models: Results from Tropical Composition, Cloud and Climate Coupling (TC4) and the Indirect and Semi-Direct Aerosol Campaign (ISDAC)." Journal of Geophysical Research - Atmospheres, 116, D00T03, doi:10.1029/2010JD015433. Relationship between De and Vm for all tropical cirrus cloud types (solid

270

Research Highlight  

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

Evaluation of a New Mixed-Phase Cloud Microphysics Parameterization with Evaluation of a New Mixed-Phase Cloud Microphysics Parameterization with SCAM, CAPT Forecasts and M-PACE Observations Download a printable PDF Submitter: Liu, X., University of Wyoming Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Liu, X, S Xie, and SJ Ghan. 2007. "Evaluation of a new mixed-Phase cloud microphysics parameterization with the NCAR single column climate model (SCAM) and ARM M-PACE observations." Geophysical Research Letters 34, L23712, doi:10.1029/2007GL031446. Xie, S, J Boyle, SA Klein, X Liu and S Ghan. 2008. "Simulations of arctic mixed-phase clouds in forecasts with CAM3 and AM2 for M-PACE." Journal of Geophysical Research, in press.

271

Research Highlight  

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

ARM Program Research Improves Longwave Radiative Transfer Models ARM Program Research Improves Longwave Radiative Transfer Models Submitter: Turner, D. D., National Oceanic and Atmospheric Administration Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Radiative Processes Journal Reference: The QME AERI LBLRTM: A closure experiment for downwelling high spectral resolution infrared radiance. D.D. Turner, D.C. Tobin, S.A. Clough, P.D. Brown, R.G. Ellingson, E.J. Mlawer, R.O. Knuteson, H.E. Revercomb, T.R. Shippert, and W.L. Smith. 2004. Journal of Atmospheric Science, 61, 2657-2675. Top panels: Examples of downwelling infrared radiance observed by the AERI for two different clear sky cases with different amounts of water vapor. Bottom panels: Differences between the AERI observations and calculations

272

Research Input Form  

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

HighlightsSubmit HighlightsSubmit Form Submit a New Research Highlight Sort Highlights Submitter Title Research Area Working Group Submission Date DOE Progress Reports Notable Research Findings for 2001-2006 Biological and Environmental Research Abstracts Database Research Highlights Summaries Research Highlight Submittal Form Tell us about your research! This form is designed to collect summary information about working group research results. If you have any questions or comments, please contact the administrators. Journal or Book Reference(s) (if applicable): Look Up Your reference from the Publications Database. Limit two references. If you have not submitted the references, please Add it now. Area of Research: Radiation Processes Cloud Distributions/Characterizations Surface Properties General Circulation and Single Column

273

Research Highlights Sorted by Research Area  

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

Research Area Research Area Radiation Processes | Cloud Distributions/Characterizations | Surface Properties | General Circulation and Single Column Models/Parameterizations | Aerosol Properties | Atmospheric Thermodynamics and Vertical Structures | Clouds with Low Optical [Water] Depths (CLOWD) | Vertical Velocity | Broadband Heating Rate Profile (BBHRP) | Cloud-Aerosol-Precipitation Interactions | Cloud Processes | Aerosol Processes Radiation Processes Alexandrov, M. D. Optical Depth Measurements by Shadowband Radiometers and Their Uncertainties ARM Berg, L. Surface Summertime Radiative Forcing by Shallow Cumuli at the ARM SGP ARM Bergmann, D. The Influence of Regional Anthropogenic Emission Reductions on Aerosol Direct Radiative Forcing ASR Bhattacharya, A. Burning on the Prairies ARM

274

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

275

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

276

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

277

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

278

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

279

Research Highlight  

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

Surface Characterization Data for the ARM SGP CART Site Surface Characterization Data for the ARM SGP CART Site Submitter: Cialella, A. T., Brookhaven National Laboratory Area of Research: Surface Properties Journal Reference: N/A Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 The ARM External Data Center (XDC) is continually searching for surface characterization data for the ARM CART sites. These data can provide a better understanding of geophysical parameters, allowing for more accurate parameterization within General Circulation Models (GCMs), thus improving their preditive power. Below are a sample of surface characterization data available and their sources: The land use/land cover map above was provided by Oklahoma State University (Figure 1). Eighty-eight covertypes, interpreted from county orthophotos, were generalized to 25 cover types. The resolution of the data is 200m by

280

Climatological Effects of Orography and Land–Sea Heating Contrasts on the Gravity Wave–Driven Circulation of the Mesosphere  

Science Conference Proceedings (OSTI)

On the basis of permanent January simulations performed with an idealized general circulation model for the troposphere and middle atmosphere, the sensibility of the general circulation to orographic and thermal forcing of large-scale stationary ...

Erich Becker; Gerhard Schmitz

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Gravitational Potential Energy Balance for the Thermal Circulation in a Model Ocean  

Science Conference Proceedings (OSTI)

The gravitational potential energy balance of the thermal circulation in a simple rectangular model basin is diagnosed from numerical experiments based on a mass-conserving oceanic general circulation model. The vertical mixing coefficient is ...

Rui Xin Huang; Xingze Jin

2006-07-01T23:59:59.000Z

282

A Model Investigation of Aerosol-Induced Changes in Boreal Winter Extratropical Circulation  

Science Conference Proceedings (OSTI)

The authors examine the key characteristics of the boreal winter extratropical circulation changes in response to anthropogenic aerosols, simulated with a coupled atmosphere–slab ocean general circulation model. The zonal-mean response features a ...

Y. Ming; V. Ramaswamy; Gang Chen

2011-12-01T23:59:59.000Z

283

Stratospheric versus Tropospheric Control of the Strength and Structure of the Brewer–Dobson Circulation  

Science Conference Proceedings (OSTI)

The strength and structure of the Brewer–Dobson circulation (BDC) are explored in an idealized general circulation model. It is shown that diabatic forcing of the stratosphere and planetary wave forcing by the troposphere can have comparable ...

Edwin P. Gerber

2012-09-01T23:59:59.000Z

284

A Non-normal View of the Wind-Driven Ocean Circulation  

Science Conference Proceedings (OSTI)

Generalized linear stability theory is applied to the wind-driven ocean circulation in the form of a double gyre described by the barotropic quasigeostrophic vorticity equation. The development of perturbations on this circulation is considered. ...

Andrew M. Moore; Cristina L. Perez; Javier Zavala-Garay

2002-09-01T23:59:59.000Z

285

The Modeled Response of the Mean Winter Circulation to Zonally Averaged SST Trends  

Science Conference Proceedings (OSTI)

The response of the atmospheric winter circulation in both hemispheres to changes in the meridional gradient of sea surface temperature (SST) is examined in an atmospheric general circulation model. Climatological SSTs are employed for the ...

Gudrun Magnusdottir

2001-11-01T23:59:59.000Z

286

A Coupled Theory of Tropical Climatology: Warm Pool, Cold Tongue, and Walker Circulation  

Science Conference Proceedings (OSTI)

Based on results from analytic and general circulation models, the authors propose a theory for the coupled warm pool, cold tongue, and Walker circulation system. The intensity of the coupled system is determined by the coupling strength, the ...

Zhengyu Liu; Boyin Huang

1997-07-01T23:59:59.000Z

287

Global Teleconnections in Response to a Shutdown of the Atlantic Meridional Overturning Circulation  

Science Conference Proceedings (OSTI)

The global response to a shutdown of the Atlantic meridional overturning circulation (AMOC) is investigated by conducting a water-hosing experiment with a coupled ocean–atmosphere general circulation model. In the model, the addition of ...

Lixin Wu; Chun Li; Chunxue Yang; Shang-Ping Xie

2008-06-01T23:59:59.000Z

288

Mechanisms for Tropical Tropospheric Circulation Change in Response to Global Warming  

Science Conference Proceedings (OSTI)

The annual-mean tropospheric circulation change in global warming is studied by comparing the response of an atmospheric general circulation model (GCM) to a spatial-uniform sea surface temperature (SST) increase (SUSI) with the response of a ...

Jian Ma; Shang-Ping Xie; Yu Kosaka

2012-04-01T23:59:59.000Z

289

The Influence of a Weakening of the Atlantic Meridional Overturning Circulation on ENSO  

Science Conference Proceedings (OSTI)

The influences of a substantial weakening of the Atlantic meridional overturning circulation (AMOC) on the tropical Pacific climate mean state, the annual cycle, and ENSO variability are studied using five different coupled general circulation ...

A. Timmermann; Y. Okumura; S.-I. An; A. Clement; B. Dong; E. Guilyardi; A. Hu; J. H. Jungclaus; M. Renold; T. F. Stocker; R. J. Stouffer; R. Sutton; S.-P. Xie; J. Yin

2007-10-01T23:59:59.000Z

290

The Global Zonally Integrated Ocean Circulation, 1992–2006: Seasonal and Decadal Variability  

Science Conference Proceedings (OSTI)

The zonally integrated meridional and vertical velocities as well as the enthalpy transports and fluxes in a least squares adjusted general circulation model are used to estimate the top-to-bottom oceanic meridional overturning circulation (MOC) ...

Carl Wunsch; Patrick Heimbach

2009-02-01T23:59:59.000Z

291

Formation and Circulation of Mode Waters of the North Pacific in a High-Resolution GCM  

Science Conference Proceedings (OSTI)

Formation and circulation of mode waters in the subtropical North Pacific are investigated by performing a numerical simulation with a high-resolution general circulation model. In the model, important features for forming mode waters, such as ...

Hiroyuki Tsujino; Tamaki Yasuda

2004-02-01T23:59:59.000Z

292

Stochastic Characterization of Regional Circulation Patterns for Climate Model Diagnosis and Estimation of Local Precipitation  

Science Conference Proceedings (OSTI)

Two statistical approaches for linking large-scale atmospheric circulation patterns and daily local rainfall are applied to GCM (general circulation model) climate simulations. The ultimate objective is to simulate local precipitation associated ...

Eduardo Zorita; James P. Hughes; Dennis P. Lettemaier; Hans von Storch

1995-05-01T23:59:59.000Z

293

The Response of the Tropospheric Circulation to Water Vapor–Like Forcings in the Stratosphere  

Science Conference Proceedings (OSTI)

An idealized, dry general circulation model is used to examine the response of the tropospheric circulation to thermal forcings that mimic changes in stratospheric water vapor (SWV). It is found that SWV-like cooling in the stratosphere produces a ...

Neil F. Tandon; Lorenzo M. Polvani; Sean M. Davis

2011-11-01T23:59:59.000Z

294

The Dependence of the Low-Level Equatorial Easterly Jet on Hadley and Walker Circulations  

Science Conference Proceedings (OSTI)

How the time-mean Hadley and Walker circulations affect the formation of a low-level equatorial easterly jet is investigated. Experiments are conducted for equinoctial conditions using a general circulation model, the Community Climate Model (...

David S. Battisti; David D. Ovens

1995-11-01T23:59:59.000Z

295

The Seasonal Evolution of the Atmospheric Circulation over West Africa and Equatorial Africa  

Science Conference Proceedings (OSTI)

This paper examines the mean annual cycle of rainfall and general circulation features over West Africa and central Africa for 1958–97. Rainfall is examined using a 1400-station archive compiled by the first author. Other circulation features are ...

Sharon E. Nicholson; Jeremy P. Grist

2003-04-01T23:59:59.000Z

296

A Model Investigation of Aerosol-Induced Changes in Tropical Circulation  

Science Conference Proceedings (OSTI)

This study investigates how anthropogenic aerosols, alone or in conjunction with radiatively active gases, affect the tropical circulation with an atmosphere/mixed layer–ocean general circulation model. Aerosol-induced cooling gives rise to a ...

Yi Ming; V. Ramaswamy

2011-10-01T23:59:59.000Z

297

Variability in Southern Hemisphere Ocean Circulation from the 1980s to the 2000s  

Science Conference Proceedings (OSTI)

Interannual-to-decadal variability of ocean circulation in the Southern Hemisphere was examined using data from the 1980s to the 2000s in a box inverse model to estimate transport across hydrographic sections and three ocean general circulation ...

K. Katsumata; S. Masuda

2013-09-01T23:59:59.000Z

298

Deep Circulation in the South Atlantic Induced by Bottom-Intensified Mixing over the Midocean Ridge  

Science Conference Proceedings (OSTI)

The deep circulation in the South Atlantic is studied through numerical experiments, using an oceanic general circulation model based on z coordinates. The new feature of these numerical experiments is that diapycnal mixing is idealized as strong ...

Rui Xin Huang; Xiangze Jin

2002-04-01T23:59:59.000Z

299

Research Highlight  

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

Progress in Understanding Water Vapor's Role in Models Progress in Understanding Water Vapor's Role in Models Submitter: Ackerman, T. P., University of Washington Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: N/A Time-height cross sections of water vapor mixing ratio, which is observed directly by the ARM Raman lidar at 10-min and approximately 100 m resolution, and relative humidity for 29 November through 2 December 2002. The bottom panel shows the comparison of the precipitable water vapor observed by the Raman lidar and the collocated microwave radiometer. The time-height cross sections, as well as the integrated field, show the large variability in water vapor that exists over the ARM Southern Great Plains site. After years of sustained research efforts into the accuracy of atmospheric

300

Research Highlight  

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

ARM M-PACE Data Used to Evaluate and Improve Arctic Mixed-Phase Clouds ARM M-PACE Data Used to Evaluate and Improve Arctic Mixed-Phase Clouds Simulated in Climate Models Download a printable PDF Submitter: Xie, S., Lawrence Livermore National Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Xie, S, J Boyle, SA Klein, X Liu, and S Ghan. 2008. "Simulations of Arctic mixed-phase clouds in forecasts with CAM3 and AM2 for M-PACE." Journal of Geophysical Research 113, D04211, doi:10.1029/2007JD009225. Time-height cross sections of active remote sensing cloud layer (ARSCL) cloud frequency (a) and modeled cloud fraction (b) CAM3, (c) AM2, and (d) CAM3LIU at Barrow during M-PACE. The unit is %. Liquid fraction as a function of cloud height. (a) UND citation data, (b)

Note: This page contains sample records for the topic "research general circulation" 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

Research Highlight  

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

Evaluate the Diurnal Cycle in the Multiscale Modeling Framework Using Evaluate the Diurnal Cycle in the Multiscale Modeling Framework Using Satellite and ARM Data Download a printable PDF Submitter: Zhang, Y., Lawrence Livermore National Laboratory Klein, S., Lawrence Livermore National Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Zhang, Y, SA Klein, C Liu, B Tian, RT Marchand, JM Haynes, RB McCoy, Y Zhang, and TP Ackerman. 2008. "On the diurnal cycle of deep convection, high-level cloud, and upper troposphere water vapor in the Multiscale Modeling Framework." Journal of Geophysical Research 113, D16105, doi:10.1029/2008JD009905. Figure 1: Diurnal anomalies for tropical (left) ocean and (right) land: (top) the precipitation index (PI), high-level cloud (CLD) and upper

302

Research Highlight  

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

Precipitation Forecast Improved with a New Convective Triggering Mechanism Precipitation Forecast Improved with a New Convective Triggering Mechanism Download a printable PDF Submitter: Xie, S., Lawrence Livermore National Laboratory Zhang, M., Stony Brook University Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Xie, S, and M Zhang. 2000. "Impact of the convective triggering function on single-column model simulations." Journal of Geophysical Research 105: 14983-14996. Six-hour accumulated precipitation valid at 12 UTC 18 July 2005. (a) Radar Observation, (b) DCAPE, (c) GSM without the DCAPE trigger, and (d) GSM with the DCAPE trigger. Considerable improvement of precipitation forecast is obtained by the GSM with the new trigger compared to the radar observation.

303

Research Highlight  

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

Probabilistic Approach Useful for Evaluating Cloud System Models Probabilistic Approach Useful for Evaluating Cloud System Models Submitter: Jakob, C., Monash University Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Jakob, C., R. Pincus, C. Hannay, and K.M. Xu (2004). Use of cloud radar observations for model evaluation: A probabilistic approach, J. Geophys. Res., 109, D03202, doi:10.1029/2003JD003473. In evaluating climate models, time and space represent key challenges when extrapolating observations into simulations. Researchers supported by DOE's Atmospheric Radiation Measurement (ARM) Program have explored an alternative method based on "point series data" to arrive at model cloud predictions. Point series data are obtained over time through measurements

304

Dynamics of the Shallow Meridional Circulation around Intertropical Convergence Zones  

Science Conference Proceedings (OSTI)

The generally accepted view of the meridional circulation in the tropical east Pacific is that of a single deep overturning cell driven by deep convective heating in the intertropical convergence zone (ITCZ), similar to the zonal mean Hadley ...

David S. Nolan; Chidong Zhang; Shu-hua Chen

2007-07-01T23:59:59.000Z

305

Portable oven air circulator  

DOE Patents (OSTI)

A portable air circulating apparatus for use in cooking ovens which is used to create air currents in the oven which transfer heat to cooking foodstuffs to promote more rapid and more uniform cooking or baking, the apparatus including a motor, fan blade and housing of metallic materials selected from a class of heat resistant materials.

Jorgensen, Jorgen A. (Bloomington, MN); Nygren, Donald W. (Minneapolis, MN)

1983-01-01T23:59:59.000Z

306

Influence of Doubled CO2 on Ozone via Changes in the Brewer–Dobson Circulation  

Science Conference Proceedings (OSTI)

In this short note, the effect of enhanced circulation due to doubling CO2 on ozone is investigated. The difference of Brewer–Dobson circulation (BDC) between the doubled CO2 and control run from an idealized atmospheric general circulation model ...

Xun Jiang; Scott J. Eichelberger; Dennis L. Hartmann; Runlie Shia; Yuk L. Yung

2007-07-01T23:59:59.000Z

307

Research Highlight  

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

Ground-Based Cloud Measurements Utilized to Evaluate the Simulation of Ground-Based Cloud Measurements Utilized to Evaluate the Simulation of Arctic Clouds in CCSM4 Download a printable PDF Submitter: de Boer, G., University of Colorado, Boulder/CIRES Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: de Boer G, W Chapman, JE Kay, B Medeiros, MD Shupe, S Vavrus, and JE Walsh. 2011. "A characterization of the present-day Arctic atmosphere in CCSM4." Journal of Climate, 25(8), doi:10.1175/JCLI-D-11-00228.1. Time-height cross-sections of simulated (top) and observed (second row) cloud phase at Barrow, Alaska. The difference between the frequencies of occurrence of each phase is indicated in the third row. Monthly distributions of liquid (dark) and ice (light) water paths at

308

Research Highlight  

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

Addressing the "Light Precipitation Problem" in the ECMWF Global Model Addressing the "Light Precipitation Problem" in the ECMWF Global Model Download a printable PDF Submitter: Ahlgrimm, M., European Centre for Medium-Range Weather Forecasts Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: Ahlgrimm M and R Forbes. 2013. "Improving the representation of low clouds and drizzle in the ECMWF model based on ARM observations from the Azores." Monthly Weather Review, , . ACCEPTED. Monthly mean cloud and precipitation occurrence from observations (red), the control version of the single column model (green) and the SCM experiment (blue). (a) Total cloud occurrence. (b) Low cloud (solid) and deep boundary layer (dashed) cloud occurrence. (c) Precipitation occurrence

309

Research Highlight  

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

A Tall Order: Climate Models Fall Short in Predicting African Sahel A Tall Order: Climate Models Fall Short in Predicting African Sahel Rainfall Download a printable PDF Submitter: Roehrig, R., Meteo-France CNRM/GMME/MOANA Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud-Aerosol-Precipitation Interactions Journal Reference: Roehrig R, D Bouniol, F Guichard, F Hourdin, and JL Redelsperger. 2013. "The present and future of the West African Monsoon: A process-oriented assessment of CMIP5 simulations along the AMMA transect." Journal of Climate, 26(17), doi:10.1175/jcli-d-12-00505.1. The wealth of data available from field campaigns between the Gulf of Guinea and the Sahara Desert allowed scientists to evaluate the ability of climate models to accurately predict rainfall in the area.

310

Research Highlight  

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

Weather Forecasting in the Tropics with Climate Models Is Feasible Weather Forecasting in the Tropics with Climate Models Is Feasible Submitter: Boyle, J., Lawrence Livermore National Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Climate Model Forecast Experiments for TOGA-COARE. J. Boyle,S. Klein,G. Zhang,S. Xie,X. Wei. Accepted by Monthly Weather Review Figure 1. Profiles of the apparent heat source (Q1) at the TOGA-COARE central site for the observations and day-two forecasts of the CAM, CAM with Zhang modification (ZMO), and AM2 averaged over the entire TOGA-COARE period are shown. Units are degrees Kelvin day. The CAM with the Zhang modified deep convection produced the best fit to the observations. Proper simulation of both the magnitude and level of maximum heating were shown to

311

Research Highlight  

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

Cloud Regimes in the TWP and Their Evolution over the MJO Cloud Regimes in the TWP and Their Evolution over the MJO Download a printable PDF Submitter: Del Genio, A. D., NASA Area of Research: Cloud Distributions/Characterizations Working Group(s): Cloud Modeling Journal Reference: Chen, Y, and AD Del Genio. 2008. "Evaluation of tropical cloud regimes in observations and a general circulation model." Climate Dynamics doi:10.1007/s00382-008-0386-6. Mean highest cloud-top vertical profiles from ARSCL (solid) and ISCCP (dashed) for each ISCCP cloud regime at Manus. Relative frequency of occurrence of each cloud regime as a function of lag in pentads relative to the MJO peak for eight MJO events covering November-April of 1999-2003. Red = deep convective, orange = anvil, yellow = congestus, green = thin cirrus, blue = shallow cumulus, violet =

312

Research Highlight  

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

Sub-Grid Scale Cloud Variability Affects Vertical Structure of Clouds and Sub-Grid Scale Cloud Variability Affects Vertical Structure of Clouds and Radiative Heating Submitter: McFarlane, S. A., U.S. Department of Energy Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: McFarlane, S. A., J. H. Mather, and T. P. Ackerman (2007), Analysis of tropical radiative heating profiles: A comparison of models and observations, J. Geophys. Res., 112, D14218, doi:10.1029/2006JD008290. Comparison of the distributions of cloud condensate for the ACRF TWP site at Manus using a) retrievals from the ACRF remote sensors, b) the CAM, c) all MMF columns, and d) MMF columns that do not contain precipitation. Note that the ARM observations do not include precipitation. Each panel consists

313

Research Highlight  

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Splitting the Solar Spectrum: Sometimes Less Is Better Than More Splitting the Solar Spectrum: Sometimes Less Is Better Than More Submitter: Pawlak, D. T., Pennsylvania State University Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Pawlak, DT, EJ Clothiaux, MF Modest, and JNS Cole. 2004. Full-Spectrum Correlated-k Distribution for Shortwave Atmospheric Radiative Transfer. Journal of the Atmospheric Sciences 61: 2588-2601. Of all the physical and dynamical calculations required in numerical weather prediction and climate modeling, radiation calculations consume the most computational time. This is because the radiation transfer physics of the atmosphere involve molecular absorption that occurs in narrowly defined absorption bands of the electromagnetic spectrum. The exact location in the

314

Research Highlight  

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Intercomparison of Longwave Radiative Heating Algorithms Intercomparison of Longwave Radiative Heating Algorithms Submitter: Baer, F., University of Maryland Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Baer, F., N. Arsky, J. J. Charney, and R. G. Ellingson. 1996. "Intercomparison of Heating Rates Generated by Global Climate Model Longwave Radiation Codes." J. Geoph. Res., 101, D21, 26589-26603. 30 levels of longwave heating rates for all algorithms tested at the five locations for the high cloud Same as Figure 1 but with the clouds removed (clear sky assumption). Same as Figure 1 but a different view. Averaged heating rates and heating rates of averaged. Same as Figure 3 but with the clouds removed (clear sky assumption).

315

Research Highlight  

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Simulating Mixed-Phase Clouds: Sensitivity to Ice Initiation Simulating Mixed-Phase Clouds: Sensitivity to Ice Initiation Download a printable PDF Submitter: Sednev, I., Lawrence Berkeley National Laboratory Menon, S., Lawrence Berkeley National Laboratory McFarquhar, G., University of Illinois, Urbana Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: I Sednev, S Menon, and G McFarquhar. 2008. "Simulating mixed-phase Arctic stratus clouds: Sensitivity to ice initiation mechanisms." Atmospheric Chemistry and Physics Discussion 8: 11755-11819. The vertical structure and radiative properties of persistent low-level Arctic clouds depend on their microphysics, and thus, estimation of the relative significance of the microphysical processes that occur in these

316

Research Highlight  

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A New Bulk Microphysical Scheme That Includes Riming Intensity and A New Bulk Microphysical Scheme That Includes Riming Intensity and Temperature Dependent Ice Ch Download a printable PDF Submitter: Lin, Y., Geophysical Fluid Dynamics Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: Lin Y and BA Colle. 2011. "A new bulk microphysical scheme that includes riming intensity and temperature dependent ice characteristics." Monthly Weather Review, 139(3), 10.1175/2010MWR3293.1. (a) Coefficients of area-diameter (A-D) relationship in the new scheme. (b) Same as (a), except for the mass-diameter (M-D) relationship. (c) Same as (a), but for the velocity-diameter (V-D) relationship. (d) Same as (c), but each line shows the variation with Ri. More details of the figure are

317

Research Highlight  

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

Ice Nuclei and Global Warming Ice Nuclei and Global Warming Download a printable PDF Submitter: Zeng, X., NASA - Goddard Space Flight Center Tao, W., NASA - Goddard Space Flight Center Zhang, M., Stony Brook University Hou, A., NASA - Goddard Space Flight Center Xie, S., Lawrence Livermore National Laboratory Lang, S. E., NASA - Goddard Space Flight Center Li, X., University of Maryland, Baltimore County Starr, D. O., NASA - Goddard Space Flight Center Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Zeng X, WK Tao, M Zhang, AY Hou, S Xie, S Lang, X Li, DO Starr, and X Li. 2009. "A contribution by ice nuclei to global warming." Quarterly Journal Royal Meteorological Society, EARLY VIEW, doi:10.1002/qj.449.

318

Research Highlight  

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

"Radiance Assimilation" Correction Method Improves Water Vapor Radiosonde "Radiance Assimilation" Correction Method Improves Water Vapor Radiosonde Observations in the Upper Troposphere Submitter: Soden, B. J., University of Miami Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Soden, B.J., D.D. Turner, B.M. Lesht, and L.M. Miloshevich (2004), An analysis of satellite, radiosonde, and lidar observations of upper tropospheric water vapor from the Atmospheric Radiation Measurement Program, J. Geophys. Res., 109, D04105, doi:10/1029/2003JD003828. Time-average relative humidity profiles from both original (black) and radiance-adjusted (blue) radiosonde soundings compared to the lidar (red) retrievals from field campaigns in 1996, 1997, 1999, and 2000.

319

Research Highlight  

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

Tackling Tropical Convection in Climate Models Tackling Tropical Convection in Climate Models Submitter: Zhang, G. J., University of California, San Diego Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Zhang, G. J., and H. Wang, 2006. Toward mitigating the double ITCZ problem in NCAR CCSM3, Geophys. Res. Lett., 33, L06709, doi:10.1029/2005GL025229 (23 March 2006). Figure 1. Climate models commonly suffer from a problem known as the double-ITCZ, which is illustrated here via observed and model-simulated rainfall at the surface. The error is seen in the region circled where, compared to observations (Image A), the original climate model (Image B) produces a second, erroneous equatorial ITCZ band southward from the one

320

Research Highlight  

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

Cloud Phase Determination Using Ground-Based AERI Observations at SHEBA Cloud Phase Determination Using Ground-Based AERI Observations at SHEBA Submitter: Turner, D. D., National Oceanic and Atmospheric Administration Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Properties Journal Reference: Turner, D.D., S.A. Ackerman, B.A. Baum, H.E. Revercomb, and P. Yang, 2003: "Cloud Phase Determination Using Ground-Based AERI Observations at SHEBA," Journal of Applied Meteorology 42(6):701-715. The SHEBA experiment in Barrow, Alaska used data collected by the ground-based radiation observations from the Atmospheric Emitted Radiance Interferometer (AERI). (Photo Credit: SHEBA Project Office) Key Contributors: S.A. Ackerman, B.A. Baum, H.E. Revercomb, P. Yang, In the frigid environs of the Acrtic, ARM scientists at the North Slope of

Note: This page contains sample records for the topic "research general circulation" 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

Research Highlight  

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

Seasonal Case Studies Reveal Significant Variance in Large-Scale Forcing Seasonal Case Studies Reveal Significant Variance in Large-Scale Forcing Data Submitter: Xie, S., Lawrence Livermore National Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Xie, S, R.T Cederwall, M. Zhang, and J.J. Yio, Comparison of SCM and CSRM forcing data derived from the ECMWF model and from objective analysis at the ARM SGP site, J. Geophys. Res., 108(D16), 4499, doi:10.1029/2003JD003541, 2003. Observed (left) and ECMWF-derived (right) forcing fields of time-height distributions of the derived (top) vertical velocity, (middle) total advective tendency and temperature, and (bottom) total advective tendency of moisture during the selected strong precipitation period during summer

322

Research Highlight  

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

Single-Column Modeling, GCM Parameterizations and ARM Data Single-Column Modeling, GCM Parameterizations and ARM Data Submitter: Somerville, R. C., Scripps Institution of Oceanography Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Randall, D.A., K.-M. Xu, R.C.J. Somerville, and S. Iacobellis, 1996: "Single-Column Models and Cloud Ensemble Models as Links between Observations and Climate Models," J. Climate 9(8)1683-1697. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 We have developed a Single-Column Model (SCM) to validate GCM cloud-radiation parameterizations against ARM observational data. The SCM is a computationally efficient one-dimensional representation of the atmospheric column overlying a single GCM grid cell. The SCM is integrated

323

Research Highlight  

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

Progress Towards Climate Projections of Central U.S. Rainfall Using a Progress Towards Climate Projections of Central U.S. Rainfall Using a Global Model with Embedded Explicit Convection Download a printable PDF Submitter: Pritchard, M. S., Scripps Institution of Oceanography Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: Pritchard MS, MW Moncrieff, and RC Somerville. 2011. "Orogenic propagating precipitation systems over the US in a global climate model with embedded explicit convection." Journal of the Atmospheric Sciences, 68, doi:10.1175/2011JAS3699.1. Characteristic time-longitude structure of central U.S. summer diurnal convection (35-45 N) (a) as observed in 2005 from space-borne infrared imagers, and as simulated by (b) the Community Atmosphere Model (CAM) v3.5

324

Research Highlight  

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

Comparing Global Atmospheric Model Simulations of Tropical Convection Comparing Global Atmospheric Model Simulations of Tropical Convection Download a printable PDF Submitter: Lin, Y., Geophysical Fluid Dynamics Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: N/A Mean profiles of (first column) total precipitation normalized Q1, (second column) convective precipitation normalized convective heating, (third column) stratiform heating, and (fourth column) convective mass flux for the (top) wet, (middle) dry, and (bottom) break period from models and available observational estimates. Dashed lines are fine resolution model results. Note the different x axis scale for the third and fourth columns. An intercomparison of global atmospheric model simulations of tropical

325

Research Highlight  

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

Parameterization of Riming Intensity and Its Impact on Ice Fall Speed Using Parameterization of Riming Intensity and Its Impact on Ice Fall Speed Using ARM Data Download a printable PDF Submitter: Lin, Y., Geophysical Fluid Dynamics Laboratory Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: Lin Y, DJ Leo, and BA Colle. 2011. "Parameterization of riming intensity and its impact on ice fall speed using ARM data." Monthly Weather Review, 139(3), 10.1175/2010MWR3299.1. (a) Scatter plot of the observed Doppler velocities from the MMCR against the ice fall velocities derived using the Heymsfield and Donner (1990) formula. (b) Same as (a), but shows the ice fall velocities derived using Eq. 4 with RMF_para. Annual long-term mean precipitation in mm day-1 for: (a) GPCPv2, (b) CTL

326

Research Highlight  

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

Validating Single Column Models with ARM Data Validating Single Column Models with ARM Data Submitter: Somerville, R. C., Scripps Institution of Oceanography Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Iacobellis, S.F., McFarquhar, G.M., Mitchell, D.L., and Somerville, R.C.J., 2003: "The Sensitivity of Radiative Fluxes to Parameterized Cloud Microphysics," J. Climate 16(18): 2979-2996. Scientists validated the results of both models by comparing them with the solar radiation as measured by the ARM instruments in the same grid cell. Scientists compared predictions of two models (red and blue lines) with measurements taken by ARM instruments (yellow line) at the same location. The models predict the amount and optical properties of clouds and the

327

Research Highlight  

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

Critical Evaluation of the ICARUS Portion of the ISCCP Simulator Using ARM Critical Evaluation of the ICARUS Portion of the ISCCP Simulator Using ARM Data Download a printable PDF Submitter: Mace, G., Utah State University Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle Journal Reference: Mace GG, S Houser, S Benson, SA Klein, and QL Min. 2011. "Critical evaluation of the ISCCP simulator using ground-based remote sensing data." Journal of Climate, 24(6), doi:10.1175/2010JCLI3517.1. Figure 1. Comparison of actual cloud top pressure from ARM remote sensors compared to ISCCP (top) and after the ICARUS algorithm has been used to convert the measured cloud top pressures to ISCCP-like quantities (bottom). Figure 2. Comparison of various measures of optical depth. Top left shows

328

Research Highlight  

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

Modeling Cloud Forcing in the Tropical West Pacific Modeling Cloud Forcing in the Tropical West Pacific Submitter: Kiehl, J., NCAR Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Modeling Journal Reference: Petch, J.C., and J.T. Kiehl, 1997: "Investigating Cloud Radiative Forcing in the Tropical West Pacific Using a Single Column Model." In Proceedings from the Seventh ARM Science Team Meeting, U.S. Department of Energy, Washington, D.C. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Here is summary of the poster "Investigating Cloud Radiative Forcing in the Tropical West Pacific Using a Single Column Model" (Petch and Kiehl) presented at the ARM 7th Science Team Meeting in San Antonio, Texas, March 1997. SCCM3, a single-column version of CCM3, has been forced with TOGA-COARE

329

Research Highlight  

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

Determining the Future of CO2 Using an Earth System Model Determining the Future of CO2 Using an Earth System Model Download a printable PDF Submitter: Keppel-Aleks, G., University of Michigan Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Aerosol Life Cycle Journal Reference: Keppel-Aleks G, JT Randerson, K Lindsay, BB Stephens, JK Moore, SC Doney, PE Thornton, NM Mahowald, FM Hoffman, C Sweeney, PP Tans, PO Wennberg, and SC Wofsy. 2013. "Atmospheric carbon dioxide variability in the Community Earth System Model: evaluation and transient dynamics during the twentieth and twenty-first centuries." Journal of Climate, 26(13), doi:10.1175/JCLI-D-12-00589.1. How models, such as the Community Earth System Model, simulate the amount of CO2 in the atmosphere will likely hold the key to monitoring climate

330

Research Highlight  

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

Estimating the Ice Crystal Enhancement Factor in the Tropics Estimating the Ice Crystal Enhancement Factor in the Tropics Download a printable PDF Submitter: Zeng, X., NASA - Goddard Space Flight Center Tao, W., NASA - Goddard Space Flight Center Area of Research: General Circulation and Single Column Models/Parameterizations Working Group(s): Cloud Life Cycle, Cloud-Aerosol-Precipitation Interactions Journal Reference: Zeng X, W Tao, T Matsui, S Xie, S Lang, M Zhang, DO Starr, and X Li. 2011. "Estimating the ice crystal enhancement factor in the tropics." Journal of the Atmospheric Sciences, 68(7), doi:10.1175/2011JAS3550.1. Figure 1. Twenty-day mean vertical profiles of IWC from the ARM-SGP observations and the three simulations using low, moderate, and high ice crystal concentrations, respectively. Figure 2. Eight-day mean vertical profiles of IWC from the TWP-ICE

331

Geostrophic Velocity Measurement Techniques for the Meridional Overturning Circulation and Meridional Heat Transport in the South Atlantic  

Science Conference Proceedings (OSTI)

Two ocean general circulation models are used to test the ability of geostrophic velocity measurement systems to observe the meridional overturning circulation (MOC) and meridional heat transport (MHT) in the South Atlantic. Model sampling ...

Renellys C. Perez; Silvia L. Garzoli; Christopher S. Meinen; Ricardo P. Matano

2011-11-01T23:59:59.000Z

332

Northern Hemispheric Trends of Pressure Indices and Atmospheric Circulation Patterns in Observations, Reconstructions, and Coupled GCM Simulations  

Science Conference Proceedings (OSTI)

The decadal trend behavior of the Northern Hemisphere atmospheric circulation is investigated utilizing long-term simulations with different state-of-the-art coupled general circulation models (GCMs) for present-day climate conditions (1990), ...

C. C. Raible; T. F. Stocker; M. Yoshimori; M. Renold; U. Beyerle; C. Casty; J. Luterbacher

2005-10-01T23:59:59.000Z

333

Abrupt Circulation Responses to Tropical Upper-Tropospheric Warming in a Relatively Simple Stratosphere-Resolving AGCM  

Science Conference Proceedings (OSTI)

The circulation response of the atmosphere to climate change–like thermal forcing is explored with a relatively simple, stratosphere-resolving general circulation model. The model is forced with highly idealized physics, but integrates the ...

Shuguang Wang; Edwin P. Gerber; Lorenzo M. Polvani

2012-06-01T23:59:59.000Z

334

Stratospheric Ozone Depletion: The Main Driver of Twentieth-Century Atmospheric Circulation Changes in the Southern Hemisphere  

Science Conference Proceedings (OSTI)

The importance of stratospheric ozone depletion on the atmospheric circulation of the troposphere is studied with an atmospheric general circulation model, the Community Atmospheric Model, version 3 (CAM3), for the second half of the twentieth ...

Lorenzo M. Polvani; Darryn W. Waugh; Gustavo J. P. Correa; Seok-Woo Son

2011-02-01T23:59:59.000Z

335

Ensembles of AGCM Two-Tier Predictions and Simulations of the Circulation Anomalies during Winter 1997–98  

Science Conference Proceedings (OSTI)

The impact of sea surface temperature (SST) anomalies on the extratropical circulation during the El Niño winter of 1997–98 is studied through atmospheric general circulation model (AGCM) integrations. The model’s midlatitude response is found to ...

John D. Farrara; Carlos R. Mechoso; Andrew W. Robertson

2000-10-01T23:59:59.000Z

336

Dynamics and Energy Balance of the Hadley Circulation and the Tropical Precipitation Zones: Significance of the Distribution of Evaporation  

Science Conference Proceedings (OSTI)

A series of numerical experiments is performed using a general circulation model with an idealistic ocean-covered boundary condition. The meridional structure of the Hadley circulation system, which is a combined structure of the Hadley ...

Atusi Numaguti

1993-07-01T23:59:59.000Z

337

Quantifying Differences in Circulation Patterns Based on Probabilistic Models: IPCC AR4 Multimodel Comparison for the North Atlantic  

Science Conference Proceedings (OSTI)

The comparison of circulation patterns (CPs) obtained from reanalysis data to those from general circulation model (GCM) simulations is a frequent task for model validation, downscaling of GCM simulations, or other climate change–related studies. ...

Henning W. Rust; Mathieu Vrac; Matthieu Lengaigne; Benjamin Sultan

2010-12-01T23:59:59.000Z

338

Dynamical Response of the Oceanic Circulation and Temperature to Interdecadal Variability in the Surface Winds over the Indian Ocean  

Science Conference Proceedings (OSTI)

A global ocean general circulation model (OGCM) is used to investigate the sensitivity of the circulation and temperature fields to observed interdecadal variability in Indian Ocean winds for the austral summer (January, February, March). Focus ...

C. J. C. Reason; R. J. Allan; J. A. Lindesay

1996-01-01T23:59:59.000Z

339

A Numerical Study on the Atmospheric Circulation over the Midlatitude North Pacific during the Last Glacial Maximum  

Science Conference Proceedings (OSTI)

The dynamics of the atmospheric circulation change over the midlatitude North Pacific under the boundary conditions during the last glacial maximum (LGM) have been studied by atmospheric general circulation models (GCMs) with different ocean ...

Wataru Yanase; Ayako Abe-Ouchi

2010-01-01T23:59:59.000Z

340

Continuous Circulation System: a new enabling technology  

E-Print Network (OSTI)

Wellbore problems have existed since the very first oil well was drilled. These problems have cost the oil industry millions of dollars because they lead to substantial loss of valuable rig time, or even loss of the well. Some of these problems are caused by the interruption of the drilling-fluid circulation. This interruption normally occurs when making drillpipe connections. Interruption of circulation causes wellbore problems like ballooning of the well, gelation of drilling mud, and settling of drilled cuttings. It also causes some operating problems in underbalanced drilling. A new technology in drilling has been introduced through a joint industry project to overcome problems caused by interruption of circulation. This technology is the Continuous Circulation System (CCS). The CCS is capable of achieving continuous circulation while making/breaking drillpipe connections. This research highlights the significance of the new technology by investigating the problems caused by interruption of circulation. It presents some potential operational problems regarding the new system and discusses the possibility to achieve continuous drilling. The economics of the new technology is presented. This study found that the CCS would prevent significant wellbore problems from occurring, hence saving valuable rig time and money. It also showed that CCS would be a valuable addition to the equipment used in underbalanced drilling. Continuous drilling while making connections can be achieved using mud-motors. On the other hand, it is not feasible through rotation of the drillstring under the current technology. Finally, the suitable marketing strategy for this phase of the new technology is to offer it for lease rather than for sale.

Kenawy, Walid F.

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Argonne TDC: Intermagnetics General Corporation  

Record-setting joint research spurs growth of superconductor market for Argonne partner. Intermagnetics General Corporation Latham, NY. Intermagnetics General ...

342

General-purpose heat source: Research and development program, radioisotope thermoelectric generator/thin fragment impact test  

SciTech Connect

The general-purpose heat source provides power for space missions by transmitting the heat of {sup 238}Pu decay to an array of thermoelectric elements in a radioisotope thermoelectric generator (RTG). Because the potential for a launch abort or return from orbit exists for any space mission, the heat source response to credible accident scenarios is being evaluated. This test was designed to provide information on the response of a loaded RTG to impact by a fragment similar to the type of fragment produced by breakup of the spacecraft propulsion module system. The results of this test indicated that impact by a thin aluminum fragment traveling at 306 m/s may result in significant damage to the converter housing, failure of one fueled clad, and release of a small quantity of fuel.

Reimus, M.A.H.; Hinckley, J.E.

1996-11-01T23:59:59.000Z

343

General-purpose heat source: Research and development program. Radioisotope thermoelectric generator impact tests: RTG-1 and RTG-2  

Science Conference Proceedings (OSTI)

The General-Purpose Heat Source (GPHS) provides power for space missions by transmitting the heat of {sup 238}Pu decay to an array of thermoelectric elements in a radioisotope thermoelectric generator (RTG). Because the potential for a launch abort or return from orbit exists for any space mission, the heat source response to credible accident scenarios is being evaluated. The first two RTG Impact Tests were designed to provide information on the response of a fully loaded RTG to end-on impact against a concrete target. The results of these tests indicated that at impact velocities up to 57 m/s the converter shell and internal components protect the GPHS capsules from excessive deformation. At higher velocities, some of the internal components of the RTG interact with the GPHS capsules to cause excessive localized deformation and failure.

Reimus, M.A.H.; Hinckley, J.E.; George, T.G.

1996-07-01T23:59:59.000Z

344

Lost Circulation Technology Development Status  

DOE Green Energy (OSTI)

Lost circulation is the loss of drilling fluid from the wellbore to fractures or pores in the rock formation. In geothermal drilling, lost circulation is often a serious problem that contributes greatly to the cost of the average geothermal well. The Lost Circulation Technology Development Program is sponsored at Sandia National Laboratories by the U.S. Department of Energy. The goal of the program is to reduce lost circulation costs by 30-50% through the development of mitigation and characterization technology. This paper describes the technical progress made in this program during the period April, 1991-March, 1992.

Glowka, David A.; Schafer, Diane M.; Loeppke, Glen E.; Scott, Douglas D.; Wernig, Marcus D.; Wright, Elton K.

1992-03-24T23:59:59.000Z

345

Lost circulation technology development status  

DOE Green Energy (OSTI)

Lost circulation is the loss of drilling fluid from the wellbore to fractures or pores in the rock formation. In geothermal drilling, lost circulation is often a serious problem that contributes greatly to the cost of the average geothermal well. The Lost Circulation Technology Development Program is sponsored at Sandia National Laboratories by the US Department of Energy. The goal of the program is to reduce lost circulation costs by 30--50% through the development of mitigation and characterization technology. This paper describes the technical progress made in this program during the period April 1991--March 1992. 8 refs.

Glowka, D.A.; Schafer, D.M.; Loeppke, G.E.; Scott, D.D.; Wernig, M.D.; Wright, E.K.

1992-01-01T23:59:59.000Z

346

Lost circulation technology development status  

DOE Green Energy (OSTI)

Lost circulation is the loss of drilling fluid from the wellbore to fractures or pores in the rock formation. In geothermal drilling, lost circulation is often a serious problem that contributes greatly to the cost of the average geothermal well. The Lost Circulation Technology Development Program is sponsored at Sandia National Laboratories by the US Department of Energy. The goal of the program is to reduce lost circulation costs by 30--50% through the development of mitigation and characterization technology. This paper describes the technical progress made in this program during the period April 1991--March 1992. 8 refs.

Glowka, D.A.; Schafer, D.M.; Loeppke, G.E.; Scott, D.D.; Wernig, M.D.; Wright, E.K.

1992-07-01T23:59:59.000Z

347

B. TRANSPORTATION, CIRCULATION AND PARKING B. TRANSPORTATION, CIRCULATION AND  

E-Print Network (OSTI)

B. TRANSPORTATION, CIRCULATION AND PARKING 231 B. TRANSPORTATION, CIRCULATION AND PARKING on transportation and connectivity issues common to UCSF as a whole. Please refer to Chapter 5, Plans for Existing characteristics specific to each individual UCSF site. DETERMINANTS OF THE 1996 LRDP The transportation

Mullins, Dyche

348

The Role of Eddy-Tansport in the Thermohaline Circulation  

SciTech Connect

Several research themes were developed during the course of this project. (1) Low-frequency oceanic varibility; (2) The role of eddies in the Antarctic Circumpolar Current (ACC) region; (3) Deep stratification and the overturning circulation. The key findings were as follows: (1) The stratification below the main thermocline (at about 500m) is determined in the circumpolar region and then communicated to the enclosed portions of the oceans through the overturning circulation. (2) An Atlantic pole-to-pole overturning circulation can be maintained with very small interior mixing as long as surface buoyancy values are shared between the northern North Atlantic and the ACC region.

Dr. Paola Cessi

2011-11-17T23:59:59.000Z

349

Climate Drift in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global version of the GFDL modular ocean model is forced using conventional restoring boundary conditions (BCs), mixed BCs (i.e., restoring the upper-level temperature but specifying a fixed salt flux), and stochastic fluxes of both heat and ...

Scott B. Power

1995-06-01T23:59:59.000Z

350

Thermal Expansion in Ocean and Coupled General Circulation Models  

Science Conference Proceedings (OSTI)

More than half of the predicted rise in future sea level caused by the enhanced greenhouse effect is currently thought to be due to the thermal expansion of the oceans. Here methods for quantifying this thermal expansion component of sea level ...

D. R. Jackett; T. J. McDougall; M. H. England; A. C. Hirst

2000-04-01T23:59:59.000Z

351

Oceanic Angular Momentum and Torques in a General Circulation Model  

Science Conference Proceedings (OSTI)

The ocean's angular momentum (M) and torques about the Polar axis are analyzed using output from the global, eddy-resolving model of Semtner and Chervin. Seasonal variability in M is dominated by the annual cycle, whose magnitude appears capable ...

Rui M. Ponte; Richard D. Rosen

1994-09-01T23:59:59.000Z

352

Posters Treatment of Cloud Radiative Effects in General Circulation...  

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

study the effects of cloudradiation- climate interaction on climate simulations. This report summarizes project progress from March 1993 to March 1994. During this period, four...

353

Idealized Hot Spot Experiments with a General Circulation Model  

Science Conference Proceedings (OSTI)

Idealized experiments are conducted using a GCM coupled to a 20-m slab ocean model to examine the short-term response to an initial localized positive equatorial SST anomaly, or “hot spot.” A hot spot is imposed upon an aquaplanet with globally ...

Eric D. Maloney; Adam H. Sobel

2007-03-01T23:59:59.000Z

354

Biennial Variability in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Recent observational analyses have indicated that tropospheric quasi-biennial oscillations (QBs) may play a fundamental role in regulating the timing and strength of El Niño and the Southern Oscillation. The biennial variability is examined in ...

Michael A. Alexander; Klaus M. Weickmann

1995-03-01T23:59:59.000Z

355

January and July Simulations with a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

We describe the results of January and July simulations carded out with a nine-level spectral model, employing a rhomboidal truncation at wavenumber 15. Sea-surface temperature, sea-ice distribution and solar zenith angle are held constant in ...

Eric J. Pitcher; Robert C. Malone; V. Ramanathan; Maurice L. Blackmon; Kamal Puri; William Bourke

1983-03-01T23:59:59.000Z

356

Use of Microwave Brightness Temperatures With a General Circulation Model  

E-Print Network (OSTI)

., 1990; Christy and Drouilhet, 1994) who compiled a monthly mean brightness temperature cli­ matology and Drouilhet, 1994). The standard deviations in Fig­ ure 3c reach 7.8 K in the January northern high lati

Fridlind, Ann

357

A Generalization of Gill's Heat-Induced Tropical Circulation  

Science Conference Proceedings (OSTI)

In this note, the local solution of Gill for the symmetric and the antisymmetric heat sources and sinks is extended to the entire global tropical belt by the authors. The symmetric and antisymmetric heating forced solutions of the motion field ...

Z. Zhang; T. N. Krishnamurti

1996-04-01T23:59:59.000Z

358

The Potential Vorticity Budget of an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The flux form of the potential vorticity (PV) equation in isentropic coordinates is used to examine the effects of advection and the effects of parameterized mechanical and thermal forcing on the PV budget of the second generation Canadian ...

J. N. Koshyk; N. A. McFarlane

1996-02-01T23:59:59.000Z

359

Thermodynamic Analysis of Ocean Circulation  

Science Conference Proceedings (OSTI)

Calculating a streamfunction as function of depth and density is proposed as a new way of analyzing the thermodynamic character of the overturning circulation in the global ocean. The sign of an overturning cell in this streamfunction directly ...

J. Nycander; J. Nilsson; K. Döös; G. Broström

2007-08-01T23:59:59.000Z

360

Residual Circulation and Tropopause Structure  

Science Conference Proceedings (OSTI)

The effect of large-scale dynamics as represented by the residual mean meridional circulation in the transformed Eulerian sense, in particular its stratospheric part, on lower stratospheric static stability and tropopause structure is studied ...

Thomas Birner

2010-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Secondary Instabilities in Langmuir Circulations  

Science Conference Proceedings (OSTI)

Finite-amplitude Langmuir circulation in the form of rolls parallel to the wind direction is shown to be subject to three-dimensional instability under certain circumstances. Density stratification is not required for instability to manifest. The ...

Amit Tandon; Sidney Leibovich

1995-06-01T23:59:59.000Z

362

Atlantic Thermohaline Circulation in a Coupled General Circulation Model: Unforced Variations versus Forced Changes  

Science Conference Proceedings (OSTI)

A 1200-yr unforced control run and future climate change simulations using the Parallel Climate Model (PCM), a coupled atmosphere–ocean–land–sea ice global model with no flux adjustments and relatively high resolution (2.8° for the atmosphere ...

Aiguo Dai; A. Hu; G. A. Meehl; W. M. Washington; W. G. Strand

2005-08-01T23:59:59.000Z

363

Research Highlight  

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

Research Highlights Summaries Modeling the Sensitivity of Convection to Tropospheric Humidity Download a printable PDF Submitter: Del Genio, A. D., NASA Area of Research: General...

364

DOE lost circulation technology development  

DOE Green Energy (OSTI)

Lost circulation is a problem common in both the geothermal and the solution mining industries. In both cases, drilling is on a relatively large scale (geothermal holes can be as large as 26 inches). Lost circulation technology development for geothermal drilling has been in progress at Sandia National Laboratories for more than 15 years. The initial work centered on lost circulation materials, but testing and modeling indicated that if the aperture of a loss zone is very large (larger than the drill bit nozzles) it cannot be plugged by simply adding materials to the drilling fluid. Thus, the lost circulation work evolved to include: (1) Development of metering techniques that accurately measure and characterize drilling fluid inflow and outflow for rapid diagnosis of los circulation and/or fluid balance while drilling. (2) Construction of a laboratory facility for testing drillable straddle packers (to improve the plugging efficiency of cementing operations) and the actual testing of components of the straddle packer. (3) Construction of a laboratory facility for the testing of candidate porous fabrics as a part of a program to develop a porous packer that places polyurethane foam into a loss zone. (4) Implementing (with Halliburton and CalEnergy Company), a program to test cementitious lost circulation material as an alternative to Portland cement.

Glowka, D.A.; Staller, G.E.; Sattler, A.R.

1996-09-01T23:59:59.000Z

365

Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands,  

Open Energy Info (EERE)

Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Italy) Revealed By Geophysical And Geochemical Approaches- Implications For General Fluid Flow Models On Volcanoes Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Italy) Revealed By Geophysical And Geochemical Approaches- Implications For General Fluid Flow Models On Volcanoes Details Activities (0) Areas (0) Regions (0) Abstract: On March 15th 2007 a paroxysmal explosion occurred at the Stromboli volcano. This event generated a large amount of products, mostly lithic blocks, some of which impacted the ground as far as down to 200 m a.s.l., about 1.5 km far away from the active vents. Two days after the

366

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

367

Atmospheric Circulation Response to an Instantaneous Doubling of Carbon Dioxide. Part I: Model Experiments and Transient Thermal Response in the Troposphere  

Science Conference Proceedings (OSTI)

This study aims to understand the dynamical mechanisms driving the changes in the general circulation of the atmosphere due to increased carbon dioxide (CO2) by looking into the transient step-by-step adjustment of the circulation. The transient ...

Yutian Wu; Richard Seager; Mingfang Ting; Naomi Naik; Tiffany A. Shaw

2012-04-01T23:59:59.000Z

368

Nucla circulating atmospheric fluidized bed demonstration project  

Science Conference Proceedings (OSTI)

During the fourth quarter of 1990, steady-state performance testing at the Nucla Circulating Fluidized Bed (CFB) resumed under sponsorship of the US Department of Energy. Co-sponsorship of the Demonstration Test Program by the Electric Power Research Institute (EPRI) was completed on June 15, 1990. From October through December, 1990, Colorado-Ute Electric Association (CUEA) completed a total of 23 steady-state performance tests, 4 dynamic tests, and set operating records during November and December as the result of improved unit operating reliability. Highlight events and achievements during this period of operation are presented.

Not Available

1991-01-31T23:59:59.000Z

369

Inspector General  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Office of the Under Secretary for Nuclear Security Edward B. Held (Acting) Under Secretary for Nuclear Security DEPARTMENT OF ENERGY Office of the Under Secretary for Management & Performance Vacant Under Secretary for Management and Performance Office of the Under Secretary for Science & Energy Vacant Under Secretary for Science and Energy Southwestern Power Administration Bonneville Power Administration Western Area Power Administration Southeastern Power Administration U.S. Energy Information Administration Loan Programs Office Advanced Research Projects Agency - Energy General Counsel Assistant Secretary for Congressional & Intergovernmental Affairs Chief Human Capital Officer

370

General Information  

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

Environment Feature Stories Public Reading Room: Environmental Documents, Reports LANL Home Phonebook Calendar Video Business Small Business General Information General...

371

Identification and predictive control for a circulation fluidized bed boiler  

Science Conference Proceedings (OSTI)

This paper introduces the design and presents the research findings of the identification and control application for an industrial Circulation Fluidized Bed (CFB) boiler. Linear Parameter Varying (LPV) model is used in the model identification where ... Keywords: CFB boilers, Identification, LPV model, Linear models interpolation, MPC

Guoli Ji, Jiangyin Huang, Kangkang Zhang, Yucai Zhu, Wei Lin, Tianxiao Ji, Sun Zhou, Bin Yao

2013-06-01T23:59:59.000Z

372

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

373

A Multilayer Model of the Thermohaline and Wind-Driven Ocean Circulation  

Science Conference Proceedings (OSTI)

A hybrid, multilayer model for the oceanic general circulation is formulated and tested. The model includes a mixed layer at the surface which is specified by Eulerian coordinates, and three moving layers below which are specified by quasi-...

Rui Xin Huang; Kirk Bryan

1987-11-01T23:59:59.000Z

374

Available Potential Energy and Irreversible Mixing in the Meridional Overturning Circulation  

Science Conference Proceedings (OSTI)

The overturning circulation of the global oceans is examined from an energetics viewpoint. A general framework for stratified turbulence is used for this purpose; first, it highlights the importance of available potential energy in facilitating ...

Graham O. Hughes; Andrew Mc C. Hogg; Ross W. Griffiths

2009-12-01T23:59:59.000Z

375

Nonnormal Perturbation Growth of Pure Thermohaline Circulation Using a 2D Zonally Averaged Model  

Science Conference Proceedings (OSTI)

Generalized linear stability theory is used to calculate the optimal initial conditions that result in transient amplification of the thermohaline circulation (THC) in a zonally averaged single-basin ocean model. The eigenmodes of the tangent ...

Julie Alexander; Adam H. Monahan

2009-02-01T23:59:59.000Z

376

Subtidal Response of Scotian Shelf Circulation to Local and Remote Forcing. Part II: Barotropic Model  

Science Conference Proceedings (OSTI)

A linear, barotropic numerical model that features realistic bathymetry of the Scotian Shelf provides solutions forced by steady and periodic wind stress that are generally incoherent on spatial scales of the shelf width. Closed circulation cells ...

Franklin B. Schwing

1992-05-01T23:59:59.000Z

377

Systematic Energy Errors and the Tendency toward Canonical Equilibrium in Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

Systematic kinetic energy errors are examined in barotropic and multilevel general circulation models. The dependence of energy spectra on resolution and dissipation and, in addition for the barotropic model, on topography and the beta effect, is ...

Jorgen S. Frederiksen; Martin R. Dix; Steven M. Kepert

1996-03-01T23:59:59.000Z

378

Sensitivity of the Global Ocean Circulation to Parameterizations of Mesoscale Tracer Transports  

Science Conference Proceedings (OSTI)

The isopycnal transport parameterization of Gent and Mc Williams has been implemented in the GFDL ocean general circulation model, replacing the physically unjustifiable horizontal mixing of tracers. The effects of this parameterization are ...

Gokhan Danabasoglu; James C. Mc Williams

1995-12-01T23:59:59.000Z

379

Can Isopycnal Mixing Control the Stability of the Thermohaline Circulation in Ocean Climate Models?  

Science Conference Proceedings (OSTI)

Convective overturning arising from static instability during winter is thought to play a crucial role in the formation of North Atlantic Deep Water (NADW). In ocean general circulation models (OGCMs), a strong reduction in convective penetration ...

Willem P. Sijp; Michael Bates; Matthew H. England

2006-11-01T23:59:59.000Z

380

Sensitivity of the Stratospheric Circulation to the Latitude of Thermal Surface Forcing  

Science Conference Proceedings (OSTI)

Using the chemistry climate model Intermediate General Circulation Model–Fast Stratospheric Ozone Chemistry (IGCM-FASTOC), the authors analyze the response in the Northern Hemisphere winter stratosphere to idealized thermal forcing imposed at the ...

Barbara Winter; Michel S. Bourqui

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

An Adjoint Analysis of the Meridional Overturning Circulation in a Hybrid Coupled Model  

Science Conference Proceedings (OSTI)

Multicentury sensitivities in a realistic geometry global ocean general circulation model are analyzed using an adjoint technique. This paper takes advantage of the adjoint model’s ability to generate maps of the sensitivity of a diagnostic (i.e.,...

Véronique Bugnion; Chris Hill; Peter H. Stone

2006-08-01T23:59:59.000Z

382

Japan Sea Thermohaline Structure and Circulation. Part II: A Variational P-Vector Method  

Science Conference Proceedings (OSTI)

The second part of this work investigates the seasonal variabilities of the Japan/East Sea (JES) circulation using the U.S. Navy Generalized Digital Environmental Model (GDEM) climatological temperature and salinity dataset (public domain) on a ...

Peter C. Chu; Jian Lan; Chenwu Fan

2001-10-01T23:59:59.000Z

383

What Sets the Strength of the Middepth Stratification and Overturning Circulation in Eddying Ocean Models?  

Science Conference Proceedings (OSTI)

The processes maintaining stratification in the oceanic middepth (between approximately 1000 and 3000 m) are explored using an eddy-resolving general circulation model composed of a two-hemisphere, semienclosed basin with a zonal reentrant ...

Christopher L. Wolfe; Paola Cessi

2010-07-01T23:59:59.000Z

384

Assimilation of Sea Surface Topography into an Ocean Circulation Model Using a Steady-State Smoother  

Science Conference Proceedings (OSTI)

The central issue of how to obtain useful, approximate, uncertainty estimates for assimilation methods using full general circulation models is addressed. Such estimates would be used with assimilation done by either sequential methods or ...

Ichiro Fukumori; Jérôme Benveniste; Carl Wunsch; Dale B. Haidvogel

1993-08-01T23:59:59.000Z

385

Simulation of Atmospheric Circulation over Tahiti and of Local Effects on the Transport of 210Pb  

Science Conference Proceedings (OSTI)

Atmospheric transport of the natural radionuclide 210Pb is simulated by a general circulation model (GCM) and calculated surface concentrations are compared with those recorded at the Tahiti station on a daily scale. Numerical results for 2006 ...

P. Heinrich; X. Blanchard

2009-06-01T23:59:59.000Z

386

On the Patterns of Wind-Power Input to the Ocean Circulation  

E-Print Network (OSTI)

Pathways of wind-power input into the ocean general circulation are analyzed using Ekman theory. Direct rates of wind work can be calculated through the wind stress acting on the surface geostrophic flow. However, because ...

Roquet, Fabien

387

On the Patterns of Wind-Power Input to the Ocean Circulation  

Science Conference Proceedings (OSTI)

Pathways of wind-power input into the ocean general circulation are analyzed using Ekman theory. Direct rates of wind work can be calculated through the wind stress acting on the surface geostrophic flow. However, because that energy is ...

Fabien Roquet; Carl Wunsch; Gurvan Madec

2011-12-01T23:59:59.000Z

388

Predictability of the Seasonal Mean Atmospheric Circulation during Autumn, Winter, and Spring  

Science Conference Proceedings (OSTI)

The predictability of the autumn, boreal winter, and spring seasons with foreknowledge of sea surface temperatures (SSTs) is studied using ensembles of seasonal simulations of three general circulation models (GCMs): the Center for Ocean–Land–...

David Straus; J. Shukla; Dan Paolino; Siegfried Schubert; Max Suarez; Philip Pegion; Arun Kumar

2003-11-01T23:59:59.000Z

389

Connecting Changing Ocean Circulation with Changing Climate  

Science Conference Proceedings (OSTI)

The influence of changing ocean currents on climate change is evaluated by comparing an earth system model’s response to increased CO2 with and without an ocean circulation response. Inhibiting the ocean circulation response, by specifying a ...

Michael Winton; Stephen M. Griffies; Bonita L. Samuels; Jorge L. Sarmiento; Thomas L. Frölicher

2013-04-01T23:59:59.000Z

390

Instability of Two-Dimensional Themohaline Circulation  

Science Conference Proceedings (OSTI)

Two different two-dimensional models of the thermohaline circulation of the ocean have been used to study the loss of stability of a thermally dominated symmetrical two-cell circulation. Although the models differ in their momentum budget, their ...

Michael Vellinga

1996-03-01T23:59:59.000Z

391

Oceanic Regulation of the Atmospheric Walker Circulation  

Science Conference Proceedings (OSTI)

A coupled theory is proposed to account for the magnitude of the Walker circulation in the tropical Pacific. It is suggested that the Pacific Walker circulation is at a saturation state, at which the zonal sea surface temperature difference is ...

Zhengyu Liu

1997-03-01T23:59:59.000Z

392

Atmospheric Control on the Thermohaline Circulation  

Science Conference Proceedings (OSTI)

In an attempt to elucidate the role of atmospheric and oceanic processes in setting a vigorous ocean overturning circulation in the North Atlantic but not in the North Pacific, a comparison of the observed atmospheric circulation and net surface ...

Arnaud Czaja

2009-01-01T23:59:59.000Z

393

The Sun's Shallow Meridional Circulation  

E-Print Network (OSTI)

The Sun's global meridional circulation is evident as a slow poleward flow at its surface. This flow is observed to carry magnetic elements poleward - producing the Sun's polar magnetic fields as a key part of the 11-year sunspot cycle. Current theories for the sunspot cycle assume that this surface flow is part of a circulation which sinks inward at the poles and turns equatorward at depths below 100 Mm. Here we use the advection of the Sun's convection cells by the meridional flow to map the flow velocity in latitude and depth. Our measurements show the largest cells clearly moving equatorward at depths below 35 Mm - the base of the Sun's surface shear layer. This surprisingly shallow return flow indicates the need for substantial revisions to solar/stellar dynamo theory.

Hathaway, David H

2011-01-01T23:59:59.000Z

394

Modes of Interannual Variability of the Southern Hemisphere Circulation Simulated by the CSIRO Climate Model  

Science Conference Proceedings (OSTI)

This study examines the capability of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) climate model in simulating the observed modes of interannual variability of the Southern Hemisphere circulation. Modes of variability ...

Wenju Cai; Ian G. Watterson

2002-05-01T23:59:59.000Z

395

Investigating the Causes of the Response of the Thermohaline Circulation to Past and Future Climate Changes  

Science Conference Proceedings (OSTI)

The Atlantic thermohaline circulation (THC) is an important part of the earth's climate system. Previous research has shown large uncertainties in simulating future changes in this critical system. The simulated THC response to idealized ...

R. J. Stouffer; J. Yin; J. M. Gregory; K. W. Dixon; M. J. Spelman; W. Hurlin; A. J. Weaver; M. Eby; G. M. Flato; H. Hasumi; A. Hu; J. H. Jungclaus; I. V. Kamenkovich; A. Levermann; M. Montoya; S. Murakami; S. Nawrath; A. Oka; W. R. Peltier; D. Y. Robitaille; A. Sokolov; G. Vettoretti; S. L. Weber

2006-04-01T23:59:59.000Z

396

Pacific Northwest Laboratory annual report for 1994 to the DOE Office of Energy Research. Part 2: Atmospheric and climate research  

Science Conference Proceedings (OSTI)

Atmospheric research at Pacific Northwest Laboratory (PNL) occurs in conjunction with the Atmospheric Chemistry Program (ACP) and with the Atmospheric Studies in Complex Terrain (ASCOT) Program. Solicitations for proposals and peer review were used to select research projects for funding in FY 1995. Nearly all ongoing projects were brought to a close in FY 1994. Therefore, the articles in this volume include a summary of the long-term accomplishments as well as the FY 1994 progress made on these projects. The following articles present summaries of the progress in FY 1994 under these research tasks: continental and oceanic fate of pollutants; research aircraft operations; ASCOT program management; coupling/decoupling of synoptic and valley circulations; interactions between surface exchange processes and atmospheric circulations; and direct simulations of atmospheric turbulence. Climate change research at PNL is aimed at reducing uncertainties in the fundamental processes that control climate systems that currently prevent accurate predictions of climate change and its effects. PNL is responsible for coordinating and integrating the field and laboratory measurement programs, modeling studies, and data analysis activities of the Atmospheric Radiation Measurements (ARM) program. In FY 1994, PNL scientists conducted 3 research projects under the ARM program. In the first project, the sensitivity of GCM grid-ad meteorological properties to subgrid-scale variations in surface fluxes and subgrid-scale circulation patterns is being tested in a single column model. In the second project, a new and computationally efficient scheme has been developed for parameterizing stratus cloud microphysics in general circulation models. In the last project, a balloon-borne instrument package is being developed for making research-quality measurements of radiative flux divergence profiles in the lowest 1,500 meters of the Earth`s atmosphere.

NONE

1995-04-01T23:59:59.000Z

397

A blood circulation model for reference man  

SciTech Connect

A dynamic blood circulation model that predicts the movement and gradual dispersion of a bolus of material in the circulation after its intravenous injection into an adult human. The main purpose of the model is improve the dosimetry of internally deposited radionuclides that decay in the circulation to a significant extent. The model partitions the blood volume into 24 separate organs or tissues, right heart chamber, left heart chamber, pulmonary circulation, arterial outflow to the aorta and large arteries, and venous return via the large veins. Model results were compared to data obtained from injection of carbon 11 labeled carbon monoxide or rubidium 86.

Leggett, R.W.; Eckerman, K.F. [Oak Ridge National Lab., TN (United States); Williams, L.R. [Indiana Univ., South Bend, IN (United States). Div. of Liberal Arts and Sciences

1996-12-31T23:59:59.000Z

398

General Engineers  

U.S. Energy Information Administration (EIA) Indexed Site

General Engineers General Engineers The U.S. Energy Information Administration (EIA) within the Department of Energy has forged a world-class information program that stresses quality, teamwork, and employee growth. In support of our program, we offer a variety of profes- sional positions, including the General Engineer, whose work is associated with analytical studies and evaluation projects pertaining to the operations of the energy industry. Responsibilities: General Engineers perform or participate in one or more of the following important functions: * Design modeling systems to represent energy markets and the physical properties of energy industries * Conceive, initiate, monitor and/or conduct planning and evaluation projects and studies of continuing and future

399

The effect of topography on the Martian atmospheric circulation and determining Pluto's atmospheric thermal structure from stellar occultations  

E-Print Network (OSTI)

Previous work with Mars General Circulation Models (MGCMs) has shown that the north-south slope in Martian topography causes asymmetries in the Hadley cells at equinox and in the annual average. To quantitatively solve for ...

Zalucha, Angela M. (Angela Marie)

2010-01-01T23:59:59.000Z

400

Real Freshwater Flux as a Natural Boundary Condition for the Salinity Balance and Thermohaline Circulation Forced by Evaporation and Precipitation  

Science Conference Proceedings (OSTI)

Freshwater flux used as a natural boundary condition for the salinity balance is applied to a primitive equation model of the oceanic general circulation. Instead of the relaxation condition or the virtual salt flux boundary conditions used in ...

Rui Xin Huang

1993-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

Simulation of Late-Twenty-First-Century Changes in Wintertime Atmospheric Circulation over Europe Due to Anthropogenic Causes  

Science Conference Proceedings (OSTI)

Evidence is presented, based on an ensemble of climate change scenarios performed with a global general circulation model of the atmosphere with high horizontal resolution over Europe, to suggest that the end-of-century anthropogenic climate ...

Laurent Terray; Marie-Estelle Demory; Michel Déqué; Gaelle de Coetlogon; Eric Maisonnave

2004-12-01T23:59:59.000Z

402

A GCM Simulation Study of the Influence of Saharan Evapotranspiration and Surface-Albedo Anomalies on July Circulation and Rainfall  

Science Conference Proceedings (OSTI)

The GLA (Goddard Laboratory for Atmospheres) GCM (general circulation model) was employed to investigate the influence of surface albedo and evapotranspiration anomalies that could result from the hypothetical semiarid vegetation over North ...

Y. C. Sud; A. Molod

1988-11-01T23:59:59.000Z

403

Associations between ?18O of Water and Climate Parameters in a Simulation of Atmospheric Circulation for 1979–95  

Science Conference Proceedings (OSTI)

The Melbourne University spectral atmospheric general circulation model is adapted to include prediction of stable water isotopes. The new scheme performs well when the modeled ?18O of precipitation is compared to both monthly observations from a ...

David Noone; I. Simmonds

2002-11-01T23:59:59.000Z

404

Downhole material injector for lost circulation control  

DOE Patents (OSTI)

This invention is comprised of an apparatus and method for simultaneously and separately emplacing two streams of different materials through a drillstring in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drillstring at the desired downhole location and harden only after mixing for control of a lost circulation zone.

Glowka, D.A.

1991-12-31T23:59:59.000Z

405

Downhole material injector for lost circulation control  

DOE Patents (OSTI)

This invention is comprised of an apparatus and method for simultaneously and separately emplacing two streams of different materials through a drillstring in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drillstring at the desired downhole location and harden only after mixing for control of a lost circulation zone.

Glowka, D.A.

1991-01-01T23:59:59.000Z

406

Downhole material injector for lost circulation control  

DOE Patents (OSTI)

Apparatus and method for simultaneously and separately emplacing two streams of different materials through a drillstring in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drillstring at the desired downhole location and harden only after mixing for control of a lost circulation zone.

Glowka, David A. (Tijeras, NM)

1994-01-01T23:59:59.000Z

407

Downhole material injector for lost circulation control  

DOE Patents (OSTI)

Apparatus and method are disclosed for simultaneously and separately emplacing two streams of different materials through a drill string in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drill string at the desired downhole location and harden only after mixing for control of a lost circulation zone. 6 figs.

Glowka, D.A.

1994-09-06T23:59:59.000Z

408

Demonstration of an advanced circulation fludized bed coal combustor phase 1: Cold model study. Final report  

Science Conference Proceedings (OSTI)

It was found that there was a strong dependence of the density profile on the secondary air injection location and that there was a pronounced solid separation from the conveying gas, due to the swirl motion. Furthermore, the swirl motion generated strong internal circulation patterns and higher slip velocities than in the case of nonswirl motion as in an ordinary circulating fluidized bed. Radial solids flux profiles were measured at different axial locations. The general radial profile in a swirling circulating fluidized bed indicated an increased downward flow of solids near the bed walls, and strong variations in radial profiles along the axial height. For swirl numbers less than 0.9, which is typical for swirling circulating fluidized beds, there is no significant increase in erosion due to swirl motion inside the bed. Pending further investigation of swirl motion with combustion, at least from our cold model studies, no disadvantages due to the introduction of swirl motion were discovered.

Govind, R. [Cincinnati Univ., OH (United States). Dept. of Chemical Engineering

1993-03-20T23:59:59.000Z

409

Geothermal Lost Circulation Zone Mapping Tool  

DOE Green Energy (OSTI)

Lost circulation is an expensive and often encountered problem when drilling into geothermal formations. A method is needed to more accurately describe loss zones encountered during geothermal drilling to allow for more realistic testing since present testing techniques are inadequate. A Lost Circulation Zone Mapping Tool (LCZMT) is being developed that will quickly locate a loss zone and then provide a visual image of this zone as it intersects the wellbore. A modified Sandia high temperature Acoustic Borehole Televiewer should allow modeling of geothermal loss zones, which would in turn lead to testing that can be performed to evaluate lost circulation materials under simulated downhole conditions. 5 refs., 5 figs.

Bauman, T.J.

1985-01-01T23:59:59.000Z

410

Atmospheric Circulation Response to an Instantaneous Doubling of Carbon Dioxide. Part II: Atmospheric Transient Adjustment and Its Dynamics  

Science Conference Proceedings (OSTI)

The dynamical mechanisms underlying the transient circulation adjustment in the extratropical atmosphere after the instantaneous doubling of carbon dioxide are investigated using the National Center for Atmospheric Research Community Atmosphere ...

Yutian Wu; Richard Seager; Tiffany A. Shaw; Mingfang Ting; Naomi Naik

2013-02-01T23:59:59.000Z

411

Role of the Tibetan Plateau on the Annual Variation of Mean Atmospheric Circulation and Storm-Track Activity  

Science Conference Proceedings (OSTI)

This study reexamines how the Tibetan Plateau (TP) modulates the annual variation of atmospheric circulation and storm-track activity based on the Meteorological Research Institute's atmosphere–ocean coupled model experiments with a progressive TP ...

Sun-Seon Lee; June-Yi Lee; Kyung-Ja Ha; Bin Wang; Akio Kitoh; Yoshiyuki Kajikawa; Manabu Abe

2013-07-01T23:59:59.000Z

412

General-purpose heat source: Research and development program. High-siliocon fuel characterization study: Half module impact tests 1 and 2  

SciTech Connect

The General-Purpose Heat Source (GPHS) provides power for space missions by transmitting the heat of {sup 238}Pu decay to an array of thermoelectric elements. Because any space mission could experience a launch abort or return from orbit, the heat source must be designed and constructed to survive credible accident environments. Previous testing conducted in support of the Galileo and Ulysses missions documented the response of GPHSs to a variety of fragment-impact, aging, atmospheric reentry, and earth-impact conditions. The evaluations documented in this report are part of an ongoing program to determine the effect of fuel impurities on the response of the heat source to conditions baselined during the Galileo/Ulysses test program. In the first two tests in this series, encapsulated GPHS fuel pellets containing high levels of silicon were aged, loaded into GPHS module halves, and impacted against steel plates. The results show no significant differences between the response of these capsules and the behavior of relatively low-silicon fuel pellets tested previously.

Reimus, M.A.H.; George, T.G.

1996-03-01T23:59:59.000Z

413

General Information  

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

ASD General Information ASD General Information APS Resources & Information A list of useful links for APS staff and users. APS Technical Publications Links to APS technical publications. APS Publications Database The official and comprehensive source of references for APS-related journal articles, conference papers, book chapters, dissertations, abstracts, awards, invited talks, etc. Image Library A collection of APS images. Responsibilities & Interfaces for APS Technical Systems Descriptions of the responsibilities of APS technical groups and how they interface with one another. APS Procedures Operational procedures for the APS. APS Specifications Specifications and approvals for upgrades or changes to existing APS hardware and software. APS Radiation Safety Policy & Procedures Committee Minutes

414

Carderock Circulating Water Channel | Open Energy Information  

Open Energy Info (EERE)

Circulating Water Channel Circulating Water Channel Jump to: navigation, search Basic Specifications Facility Name Carderock Circulating Water Channel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Channel Length(m) 18.3 Beam(m) 6.7 Depth(m) 2.7 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The Circulating Water Channel is a vertical plane, open to the atmosphere test section with a free surface in a closed recirculating water circuit, variable speed, rectangular cross-sectional shape facility. There are 10 large viewing windows on either side of the test section at different elevations and 9 in the bottom; movable bridge spans the test section for ease and versatility in mounting models, rigging bridge is capable of taking towing loads at any one of numerous points up to 35,584 N

415

South China Sea Isopycnal-Surface Circulation  

Science Conference Proceedings (OSTI)

This paper investigates the seasonal variabilities of the South China Sea isopycnal-surface circulations and of the Kuroshio intrusion through the Luzon Strait using the U.S. Navy’s climatological temperature and salinity dataset (public domain) ...

Peter C. Chu; Rongfeng Li

2000-09-01T23:59:59.000Z

416

Significance of sinusoids for myocardial blood circulation  

Science Conference Proceedings (OSTI)

As the myocardial capillaries drain tassel-like into the peripheral end of sinusoids, the venous system of the myocardium begins in the sinusoids and plays an important role in the regulation of myocardial circulation. The sinusoids dilate in response ...

N. Djavakhishvili

1997-01-01T23:59:59.000Z

417

On Thermally Direct Circulations in Moist Atmospheres  

Science Conference Proceedings (OSTI)

An expression is derived for the critical horizontal gradient of subcloud-layer ?e in radiative-convective equilibrium, sufficient for the onset of thermally direct, zonally symmetric circulations. This corresponds to zero absolute vorticity at ...

Kerry A. Emanuel

1995-05-01T23:59:59.000Z

418

On Thermally Forced Circulations over Heated Terrain  

Science Conference Proceedings (OSTI)

A combination of analytical and numerical models is used to gain insight into the dynamics of thermally forced circulations over diurnally heated terrain. Solutions are obtained for two-layer flows (representing the boundary layer and the ...

Daniel J. Kirshbaum

2013-06-01T23:59:59.000Z

419

Thermally Driven Circulations in Small Oceanic Basins  

Science Conference Proceedings (OSTI)

A linear, steady model of the circulation of a small (f plane) oceanic basin driven by heating or cooling at the surface is considered in order to examine the partition of upwelling (heating) or downwelling (cooling) between the basin's interior ...

Joseph Pedlosky

2003-11-01T23:59:59.000Z

420

On the Climatic Impact of Ocean Circulation  

Science Conference Proceedings (OSTI)

Integrations of coupled climate models with mixed-layer and fixed-current ocean components are used to explore the climatic response to varying magnitudes of ocean circulation. Four mixed-layer ocean experiments without ocean heat transports are ...

Michael Winton

2003-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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.
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421

The Autonomous Lagrangian Circulation Explorer (ALACE)  

Science Conference Proceedings (OSTI)

The autonomous Lagrangian circulation explorer (ALACE) is a subsurface float that cycles vertically from a depth where it is neutrally buoyant to the surface where it is located by, and relays data to, System Argos satellites. ALACEs are intended ...

R. E. Davis; L. A. Regier; J. Dufour; D. C. Webb

1992-06-01T23:59:59.000Z

422

Mixed Layer Deepening Due to Langmuir Circulation  

Science Conference Proceedings (OSTI)

The interaction between wind-driven Langmuir circulation and preexisting stratification is examined in order to elucidate its role in the deepening of the ocean surface mixed layer. For linear stratification, a numerical model suggests that ...

Ming Li; Chris Garrett

1997-01-01T23:59:59.000Z

423

The Bjerknes' Circulation Theorem: A Historical Perspective  

Science Conference Proceedings (OSTI)

Two lines of thinking concerning fluid rotation—using either vorticity or circulation—emerged from the nineteenth-century work of Helmholtz and Thomson (Lord Kelvin), respectively. Vilhelm Bjerknes introduced an extension of Kelvin's ideas on ...

Alan J. Thorpe; Hans Volkert; Micha?J. Ziemianski

2003-04-01T23:59:59.000Z

424

Interannual Variations in the Southern Hemisphere Circulation  

Science Conference Proceedings (OSTI)

An analysis has been made of variations in the atmospheric circulation with periods of more than 50 days occurring in the Southern Hemisphere between 1980 and 1986, using analyses produced by the European Centre for Medium Range Weather Forecasts ...

John W. Kidson

1988-12-01T23:59:59.000Z

425

Distribution and Circulation of Labrador Sea Water  

Science Conference Proceedings (OSTI)

Labrador Sea Water is the final product of the cyclonic circulation of Subpolar Mode Water in the open northern North Atlantic (McCartney and Talley, 1982). The temperature and salinity of the convectively formed Subpolar Mode Water decrease from ...

L. D. Talley; M. S. McCartney

1982-11-01T23:59:59.000Z

426

NETL: Advanced Research - Computation Energy Sciences  

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

MFIX MFIX Advanced Research Computational Energy Sciences MFIX MFIX (Multiphase Flow with Interphase eXchanges) is a general-purpose computer code developed at the National Energy Technology Laboratory (NETL) for describing the hydrodynamics, heat transfer and chemical reactions in fluid-solids systems. It has been used for describing bubbling and circulating fluidized beds and spouted beds. MFIX calculations give transient data on the three-dimensional distribution of pressure, velocity, temperature, and species mass fractions. MFIX code is based on a generally accepted set of multiphase flow equations. The code is used as a "test-stand" for testing and developing multiphase flow constitutive equations. MFIX Virtual Plant Consider a fluidized bed coal gasification reactor, in which pulverized

427

The Steady-State Atmospheric Circulation Response to Climate Changelike Thermal Forcings in a Simple General Circulation Model  

E-Print Network (OSTI)

FTP · Recommended by ALCF, ESnet, NERSC, XSEDE, Blue Waters, NCAR, many Universities What is Globus Online? 4 #12#clutch Northwestern · northwestern#quest LBL · nersc#dtn · nersc#carver · nersc#dtn_jgi · nersc#hopper 5 Sample

428

NETL: Onsite Research  

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

Fluidization Research: Multiphase Flow/Gas-Solid Transport Laboratory Fluidization Research: Multiphase Flow/Gas-Solid Transport Laboratory NETL's research, development, and demonstration initiatives are leading to improved operations of coal-based power systems, and future power supplies that are environmentally clean and economically affordable. One method NETL researchers are using is advanced computational and experimental research, which is helping to develop novel technologies, including transport gasifiers, circulating fluidized-bed combustors, and hot gas desulfurization. Enhanced computational capabilities are leading to major improvements in power plant efficiency, and therefore to reduced emissions. Transport gasifier and MFIX showing particle trajectories and oxygen concentration. MFIX simulations complement testing and development at the DOE demonstration Power System Development Facility (PSDF) in Wilsonville, Alabama (shown above). Coal and recycled materials feed into the lower mixing zone of the plant's circulating fluidized-bed. The validated simulation model is currently being used to design a commercial-scale unit.

429

Recent Changes in the Pacific Subtropical Cells Inferred from an Eddy-Resolving Ocean Circulation Model  

Science Conference Proceedings (OSTI)

In this study the subtropical cells (STC) in the Pacific Ocean are analyzed using an eddy-resolving ocean general circulation model driven by atmospheric forcing for the years 1992–2003. In particular, the authors seek to identify decadal changes ...

Wei Cheng; Michael J. McPhaden; Dongxiao Zhang; E. Joseph Metzger

2007-05-01T23:59:59.000Z

430

Effect of Atlantic Meridional Overturning Circulation on Tropical Atlantic Variability: A Regional Coupled Model Study  

Science Conference Proceedings (OSTI)

A simplified coupled ocean–atmosphere model, where an atmospheric general circulation model (AGCM) is fully coupled to a 2½-layer reduced-gravity ocean model (RGO) over the tropical Atlantic basin, is presented in the context of studying the role ...

Caihong Wen; Ping Chang; Ramalingam Saravanan

2011-07-01T23:59:59.000Z

431

Effect of Initialization on Diagnoses of NMC Large-Scale Circulation Statistics  

Science Conference Proceedings (OSTI)

General circulation fields and statistics are derived for the months of January and July 1983 from different sets of daily global analyses produced by NMC. The two sets differ only in that one has been archived prior to an initialization step, ...

Richard D. Rosen; David A. Salstein

1985-08-01T23:59:59.000Z

432

Wind-Driven Circulation on the North West Shelf of Australia  

Science Conference Proceedings (OSTI)

In this study, the wind-driven circulation of the North West Shelf of Australia is examined. Along its length, the offshore distance to the 200 m isobath is generally greater than 150 km, which means the shelf is relatively wide compared to other ...

Ian Webster

1985-11-01T23:59:59.000Z

433

Impact of Subgrid-Scale Convection on Global Thermohaline Properties and Circulation  

Science Conference Proceedings (OSTI)

In most ocean general circulation models the simulated global-scale deep-ocean thermohaline properties appear to be chronically colder and fresher than observed. To some extent, this discrepancy has been known to be due to excessive open-ocean ...

Seong-Joong Kim; Achim Stössel

2001-03-01T23:59:59.000Z

434

The Effects of Thermohaline Circulation on Wind-Driven Circulation in the South China Sea  

Science Conference Proceedings (OSTI)

The dynamic influence of thermohaline circulation on wind-driven circulation in the South China Sea (SCS) is studied using a simple reduced gravity model, in which the upwelling driven by mixing in the abyssal ocean is treated in terms of an ...

Guihua Wang; Rui Xin Huang; Jilan Su; Dake Chen

2012-12-01T23:59:59.000Z

435

General Category  

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

Sunrise and Sunset Visual Differences Sunrise and Sunset Visual Differences Name: Joey Status: other Grade: other Country: Canada Date: Spring 2012 Question: It seems that sunrise and sunset don't look symmetric. I mean that sunsets tend to have much redder skies and sunrise is usually a bit gloomier. If you see a picture, many times you can tell if its sunrise or sunset, even though I would think they should like identical, except that the sun is either going up or going down. Why do they not appear the same but in reverse? Replies: Funny you should ask as a paper just arrived which is sure to have the answer and I will read it now....... OK, the morning sky, and the sky in general, is blue due to Rayleigh scattering [which affects short wavelengths the most] of the sun light by air molecules and other microscopic particles.

436

General Information, Young Researcher Symposium 2012  

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

looks like a giant fish, with a forked tail on the "East End" -- the North Fork is rural, and the South Fork has many famous "Hamptons" resort towns. The Peconic Bay and...

437

Office of Inspector General  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Inspector General Inspector General Office of Audits and Inspections Work Plan for FY 2013 Audits Central Audits Division  Ecotality  Funding Overlap  Follow-up on Smart Grid Investment Grant  DOE's Loan Program Office's Portfolio Management  Office of Fossil Energy's Regional Carbon Sequestration Partnerships  Advanced Manufacturing Office's Combined Heat and Power Systems  DOE's Management of Contaminated Non-EM Facilities  Unneeded Real Estate  Review of For-Profit Grantees for selected DOE programs  Commercialization Efforts at National Laboratories  Research Misconduct at Office of Science  Public Dissemination of Research Results  BPA's Management of Borrowing Authority Construction  Controls Over PMA's Use of Hedging Instruments

438

NEWTON's General Science References  

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

General Science References General Science References Do you have a great general science reference link? Please click our Ideas page. Featured Reference Links: First.gov Science and Technology First.gov Science and Technology This site, sponsered by the US Government provides reference links to topics on science, telecommunications, computers, research agencies, and news. NASA Science NASA Science NASA Science, is a website sponsered by NASA, that supplies resources for understanding our world and the world above. Topics include earth science, heliophysics, the planets, astrophysics and much more. There is also an educator page! Nobel Laueate Listings and Stories Nobel Laueate Listings and Stories See the official site for the Nobel Prize, and read biographies about all of the Nobel Laureates, and there life changing discoveries and accomplishments.

439

Liquid and Ice Cloud Microphysics in the CSU General Circulation Model. Part II: Impact on Cloudiness, the Earth's Radiation Budget, and the General Circulation of the Atmosphere  

Science Conference Proceedings (OSTI)

A prognostic equation for the mass of condensate associated with large-scale cloudiness introduces a direct coupling between the atmospheric moisture budget and the radiation budget through interactive cloud amounts and cloud optical properties. ...

Laura D. Fowler; David A. Randall

1996-03-01T23:59:59.000Z

440

Evaluation of Interior Circulation in a High-Resolution Global Ocean Model. Part II: Southern Hemisphere Intermediate, Mode, and Thermocline Waters  

Science Conference Proceedings (OSTI)

A high-resolution, offline ocean general circulation model, incorporating a realistic parameterization of mixed layer convection, is used to diagnose pathways and time scales of Southern Hemisphere intermediate, mode, and lower thermocline water ...

Alexander Sen Gupta; Matthew H. England

2007-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

The Southern Oscillation in Surface Circulation and Climate over the Tropical Atlantic, Eastern Pacific, and Indian Oceans as Captured by Cluster Analysis  

Science Conference Proceedings (OSTI)

Clusters of sea level pressure (SLP), surface wind, cloudiness, and sea surface temperature (SST) in the domain of the tropical Atlantic, eastern Pacific, and Indian Oceans are introduced and discussed in terms of general circulation and climate. ...

Klaus Wolter

1987-04-01T23:59:59.000Z

442

Energetics of the 6000-yr BP Atmospheric Circulation in Boreal Summer, from Large-Scale to Monsoon Areas: A Study with Two Versions of the LMD AGCM  

Science Conference Proceedings (OSTI)

The mechanisms of northern summer monsoon changes at 6 kyr BP and their dependency to model parameterizations is investigated using two versions of the atmospheric general circulation model developed by the Laboratoire de Météorologie Dynamique, ...

Valérie Masson; Sylvie Joussaume

1997-11-01T23:59:59.000Z

443

On the Possibility of Singular Low-Frequency Spectra and Lévy Law Persistence Statistics in the Planetary-Scale Turbulent Circulation  

Science Conference Proceedings (OSTI)

Long-time integrations of general circulation models with constant forcing and idealized models of turbulent rotating discrete vortex flows in a planar dish have consistently yielded red ultralow-frequency spectra. A red spectrum having an ...

J. A. Viecelli

1998-03-01T23:59:59.000Z

444

Standing Eddies in the Meridional Overturning Circulation  

Science Conference Proceedings (OSTI)

The role of standing eddies for the meridional overturning circulation (MOC) is discussed. The time-mean isopycnal meridional streamfunction is decomposed into a time- and zonal-mean part, a standing-eddy part, and a transient-eddy part. It turns ...

Jan Viebahn; Carsten Eden

2012-09-01T23:59:59.000Z

445

Rotating Hydraulics and Upstream Basin Circulation  

Science Conference Proceedings (OSTI)

The flow in a source-fed f-plane basin drained through a strait is explored using a single-layer (reduced gravity) shallow-water numerical model that resolves the hydraulic flow within the strait. The steady upstream basin circulation is found to ...

Karl R. Helfrich; Lawrence J. Pratt

2003-08-01T23:59:59.000Z

446

Statistical mechanics and ocean circulation Rick Salmon  

E-Print Network (OSTI)

Statistical mechanics and ocean circulation Rick Salmon Scripps Institution of Oceanography, UCSD equilibrium statistical mechanics based upon the conservation of energy and potential enstrophy to the mass. The equilibrium state resembles the buoyancy structure actually observed. Key words: statistical mechanics, ocean

Salmon, Rick

447

Transport Asymmetry in Skewed Convective Circulations  

Science Conference Proceedings (OSTI)

Two simple kinematical models are used to describe the asymmetry in bottom-up and top-down diffusion in the convective boundary layer. Both models resolve the mean circulation with narrow updrafts and wider downdrafts but differ in the treatment ...

Ulrich Schumann

1993-01-01T23:59:59.000Z

448

Ocean Circulation Kinetic Energy: Reservoirs, Sources,  

E-Print Network (OSTI)

. The coupling of the generation of different energy forms in the dynamics (in either balanced or wave motions are almost nonexistent in the ocean. www.annualreviews.org · Ocean Circulation Kinetic Energy 255 Annu.Rev.Fluid processes? Are the seemingly different dynamical ranges coupled? 2. THE OCEANIC ENERGY BUDGET We begin

Ferrari, Raffaele

449

Atmospheric Science and Climate Research [EVS Program Area]  

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

Atmospheric Science and Climate Research Atmospheric Science and Climate Research EVS research, combined with portable, high-performance climate and weather applications, offers a unique look at the complexities of a dynamic planet. In an ever-changing, dynamic climate, we measure, model, and analyze atmospheric processes that are vital to understanding our planet. Our measurement capabilities range from remote sensing and surface meteorology instruments to instrumentation designed to quantify the land-atmosphere exchange of energy, water, and greenhouse gases. Modeling capabilities begin with regional-scale climate, air quality, and aerosol modeling and extend to global chemical transport models, general circulation models of the atmosphere, models of the biosphere, and coupled Earth system models.

450

Circulating Fluid-Bed Technology for Advanced Power Systems  

Science Conference Proceedings (OSTI)

Circulating fluid bed technology offers the advantages of a plug flow, yet well-mixed, and high throughput reactor for power plant applications. The ability to effectively scale these systems in size, geometry, and operating conditions is limited because of the extensive deviation from ideal dilute gas-solids flow behavior (Monazam et al., 2001; Li, 1994). Two fluid computations show promise of accurately simulating the hydrodynamics in the riser circulating fluid bed; however, validation tests for large vessels with materials of interest to the power industry are lacking (Guenther et al., 2002). There is little available data in reactors large enough so that geometry (i.e. entrance, exit, and wall) effects do not dominate the hydrodynamics, yet with sufficiently large particle sizes to allow sufficiently large grid sizes to allow accurate and timely hydrodynamic simulations. To meet this need experimental tests were undertaken with relatively large particles of narrow size distribution in a large enough unit to reduce the contributions of wall effects and light enough to avoid geometry effects. While computational fluid dynamic calculations are capable of generating detailed velocity and density profiles, it is believed that the validation and model development begins with the ability to simulate the global flow regime transitions. The purpose of this research is to generate well-defined test data for model validation and to identify and measure critical parameters needed for these simulations.

Shadle, Lawrence J.; Ludlow, J. Christopher; Mei, Joseph S. (U.S. DOE National Energy Technology Laboratory); Guenther, Christopher (Fluent, Inc.)

2001-11-06T23:59:59.000Z

451

Steam generator and circulator model for the HELAP code  

SciTech Connect

An outline is presented of the work carried out in the 1974 fiscal year on the GCFBR safety research project consisting of the development of improved steam generator and circulator (steam turbine driven helium compressor) models which will eventually be inserted in the HELAP (1) code. Furthermore, a code was developed which will be used to generate steady state input for the primary and secondary sides of the steam generator. The following conclusions and suggestions for further work are made: (1) The steam-generator and circulator model are consistent with the volume and junction layout used in HELAP, (2) with minor changes these models, when incorporated in HELAP, could be used to simulate a direct cycle plant, (3) an explicit control valve model is still to be developed and would be very desirable to control the flow to the turbine during a transient (initially this flow will be controlled by using the existing check valve model); (4) the friction factor in the laminar flow region is computed inaccurately, this might cause significant errors in loss-of-flow accidents; and (5) it is felt that HELAP will still use a large amount of computer time and will thus be limited to design basis accidents without scram or loss of flow transients with and without scram. Finally it may also be used as a test bed for the development of prototype component models which would be incorporated in a more sophisticated system code, developed specifically for GCFBR's. (auth)

Ludewig, H.

1975-07-01T23:59:59.000Z

452

Design, Development and Testing of a Drillable Straddle Packer for Lost Circulation Control in Geothermal Drilling  

DOE Green Energy (OSTI)

Lost Circulation is a widespread problem encountered when drilling geothermal wells, and often represents a substantial portion of the cost of drilling a well. The U.S. Department of Energy sponsors research and development work at Sandia National Laboratories in an effort to reduce these lost circulation expenditures. Sandia has developed a down hole tool that improves the effectiveness and reduces th cost of lost circulation cement treatment while drilling geothermal wells. This tool, the Drillable Straddle Packer, is a low-cost disposable device that is used to isolate the loss zone and emplace the cement treatment directly into the region of concern. This report documents the design and development of the Drillabe Straddle Packer, the laboratory and field test results, and the design package that is available to transfer this technology to industry users.

Gabaldon, J.; Glowka, D.A.; Gronewald, P.; Knudsen, S.D.; Raymond, D.W.; Staller, G.E.; Westmoreland, J.J.; Whitlow, G.L.; Wise, J.L.; Wright, E.K.

1999-04-01T23:59:59.000Z

453

Optimal Surface Salinity Perturbations Influencing the Thermohaline Circulation  

Science Conference Proceedings (OSTI)

Optimal surface salinity perturbations influencing the meridional overturning circulation maximum are exhibited and interpreted on a stable steady state of a 2D latitude–depth ocean thermohaline circulation model. Despite the stability of the ...

Florian Sévellec; Mahdi Ben Jelloul; Thierry Huck

2007-12-01T23:59:59.000Z

454

Mixing and Energetics of the Oceanic Thermohaline Circulation  

Science Conference Proceedings (OSTI)

Using an idealized tube model and scaling analysis, the physics supporting the oceanic thermohaline circulation is examined. Thermal circulation in the tube model can be classified into two categories. When the cooling source is at a level higher ...

Rui Xin Huang

1999-04-01T23:59:59.000Z

455

Seasonal Characteristics of Circulation in the Southeastern Tropical Indian Ocean  

Science Conference Proceedings (OSTI)

The circulation in the southeastern tropical Indian Ocean is studied using historical temperature and salinity data. A southward shift of the subtropical gyre at increasing depth dominates the structure of the annual mean circulation. Near the ...

Tangdong Qu; Gary Meyers

2005-02-01T23:59:59.000Z

456

Constraining North Atlantic circulation with transient tracer observations  

E-Print Network (OSTI)

The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are ...

Li, Xingwen, 1968-

2003-01-01T23:59:59.000Z

457

Boundary Layer Dynamics and Cross-Equatorial Hadley Circulation  

Science Conference Proceedings (OSTI)

The behavior of the Hadley circulation is analyzed in the context of an idealized axisymmetric atmosphere. It is argued that the cross-equatorial Hadley circulation exhibits two different regimes depending on the depth of the planetary boundary ...

Olivier Pauluis

2004-05-01T23:59:59.000Z

458

Dynamical constraints on monsoon circulations R. Alan Plumb  

E-Print Network (OSTI)

Dynamical constraints on monsoon circulations R. Alan Plumb Dept. of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology August 17, 2005 Abstract Monsoon circulations on monsoon circulations, a comprehensive theory of their dynamics is still lacking. It is clear that, given

459

Fuzzy expert system for solving lost circulation problem  

Science Conference Proceedings (OSTI)

Lost circulation is the most common problem encountered while drilling oil wells. This paper describes a distributed fuzzy expert system, called Smart-Drill, aimed in helping petroleum engineers to diagnose and solve lost circulation problems. To represent ... Keywords: Finite ordinal scales, Fuzzy algebra, Fuzzy expert system, Knowledge representation, Lost circulation problem, Multi-sets, Oil well drilling

Leonid Sheremetov; Ildar Batyrshin; Denis Filatov; Jorge Martinez; Hector Rodriguez

2008-01-01T23:59:59.000Z

460

Cluster Dynamics in a Circulating Fluidized Bed  

Science Conference Proceedings (OSTI)

A common hydrodynamic feature in industrial scale circulating fluidized beds is the presence of clusters. The continuous formation and destruction of clusters strongly influences particle hold-up, pressure drop, heat transfer at the wall, and mixing. In this paper fiber optic data is analyzed using discrete wavelet analysis to characterize the dynamic behavior of clusters. Five radial positions at three different axial locations under five different operating were analyzed using discrete wavelets. Results are summarized with respect to cluster size and frequency.

Guenther, C.P.; Breault, R.W.

2006-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "research general circulation" 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

NUCLA Circulating Atmospheric Fluidized Bed Demonstration Project  

Science Conference Proceedings (OSTI)

The objective of this DOE Cooperative Agreement is to conduct a cost-shared clean coal technology project to demonstrate the feasibility of circulating fluidized bed combustion technology and to evaluate economic, environmental, and operational benefits of CFB steam generators on a utility scale. At the conclusion of the Phase 2 program, testing related to satisfying these objectives was completed. Data analysis and reporting are scheduled for completion by October 1991. (VC)

Not Available

1992-02-01T23:59:59.000Z

462

Reducing mode circulating fluid bed combustion  

DOE Patents (OSTI)

A method for combustion of sulfur-containing fuel in a circulating fluid bed combustion system wherein the fuel is burned in a primary combustion zone under reducing conditions and sulfur captured as alkaline sulfide. The reducing gas formed is oxidized to combustion gas which is then separated from solids containing alkaline sulfide. The separated solids are then oxidized and recycled to the primary combustion zone.

Lin, Yung-Yi (Katy, TX); Sadhukhan, Pasupati (Katy, TX); Fraley, Lowell D. (Sugarland, TX); Hsiao, Keh-Hsien (Houston, TX)

1986-01-01T23:59:59.000Z

463

EMSL: News: General Stories  

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

General News General News Battery development may extend range of electric cars Battery development may extend range of electric cars New anode quadruples life of lithium-sulfur battery, could also help store renewable energy more cheaply Released: January 09, 2014 Scientists used EMSL capabilities and expertise to help develop and test a new anode design for lithium-sulfur batteries. The "hybrid" anode significantly extends the life of lithium-sulfur batteries, bringing them closer to commercial use. Read the PNNL news release. Batteries as they are meant to be seen Batteries as they are meant to be seen The search for long-lasting, inexpensive rechargeable batteries Released: December 27, 2013 Researchers working at EMSL study how a battery works under wet conditions

464

A General Method for Tracking Analysis and Its Application to Meteorological Data  

Science Conference Proceedings (OSTI)

Recent interest in the validation of general circulation models (GCMS) has been devoted to objective methods. A small number of authors have used the direct synoptic identification of phenomena together with a statistical analysis to perform the ...

K. I. Hodges

1994-11-01T23:59:59.000Z

465

Global circulation as the main source of cloud activity on Titan  

E-Print Network (OSTI)

Clouds on Titan result from the condensation of methane and ethane and, as on other planets, are primarily structured by circulation of the atmosphere. At present, cloud activity mainly occurs in the southern (summer) hemisphere, arising near the pole and at mid-latitudes from cumulus updrafts triggered by surface heating and/or local methane sources, and at the north (winter) pole, resulting from the subsidence and condensation of ethane-rich air into the colder troposphere. General circulation models predict that this distribution should change with the seasons on a 15-year timescale, and that clouds should develop under certain circumstances at temperate latitudes (~40\\degree) in the winter hemisphere. The models, however, have hitherto been poorly constrained and their long-term predictions have not yet been observationally verified. Here we report that the global spatial cloud coverage on Titan is in general agreement with the models, confirming that cloud activity is mainly controlled by the global circ...

Rodriguez, Sébastien; Rannou, Pascal; Tobie, Gabriel; Baines, Kevin H; Barnes, Jason W; Griffith, Caitlin A; Hirtzig, Mathieu; Pitman, Karly M; Sotin, Christophe; Brown, Robert H; Buratti, Bonnie J; Clark, Roger N; Nicholson, Phil D; 10.1038/NATURE08014

2009-01-01T23:59:59.000Z

466

A General Interface between an Atmospheric General Circulation Model and Underlying Ocean and Land Surface Models: Delocalized Physics Scheme  

Science Conference Proceedings (OSTI)

In order to represent in a most adequate way the various feedback mechanisms that govern the atmosphere–ocean or atmosphere–surface couplings, a “delocalized physics” method is introduced, in which the subgrid-scale physical parameterizations of ...

Augustin Vintzileos; Robert Sadourny

1997-05-01T23:59:59.000Z

467

A Two-Box Model of a Zonal Atmospheric Circulation in the Tropics  

Science Conference Proceedings (OSTI)

A simple fixed-SST model of a zonal circulation in the tropical atmosphere has been developed that has separate boxes for the ascending and descending branches of the atmospheric circulation. This circulation resembles the Walker circulation. ...

Michael A. Kelly; David A. Randall

2001-10-01T23:59:59.000Z

468

NUCLA Circulating Atmospheric Fluidized Bed Demonstration Project  

Science Conference Proceedings (OSTI)

This Annual Report on Colorado-Ute Electric Association's NUCLA Circulating Fluidized Bed (CFB) Demonstration Program covers the period from February 1987 through December 1988. The outline for presentation in this report includes a summary of unit operations along with individual sections covering progress in study plan areas that commenced during this reporting period. These include cold-mode shakedown and calibration, plant commercial performance statistics, unit start-up (cold), coal and limestone preparation and handling, ash handling system performance and operating experience, tubular air heater, baghouse operation and performance, materials monitoring, and reliability monitoring. During this reporting period, the coal-mode shakedown and calibration plan was completed. (VC)

Not Available

1991-01-01T23:59:59.000Z

469

Research Areas  

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

Research Areas Print Research Areas Print Scientists from a wide variety of fields come to the ALS to perform experiements. Listed below are some of the most common research areas covered by ALS beamlines. Below each heading are a few examples of the specific types of topics included in that category. Click on a heading to learn more about that research area at the ALS. Energy Science Photovoltaics, photosynthesis, biofuels, energy storage, combustion, catalysis, carbon capture/sequestration. Bioscience General biology, structural biology. Materials/Condensed Matter Correlated materials, nanomaterials, magnetism, polymers, semiconductors, water, advanced materials. Physics Atomic, molecular, and optical (AMO) physics; accelerator physics. Chemistry Surfaces/interfaces, catalysts, chemical dynamics (gas-phase chemistry), crystallography, physical chemistry.

470

EIS-0289: JEA Circulating Fluidized Bed Combustor Project | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

289: JEA Circulating Fluidized Bed Combustor Project 289: JEA Circulating Fluidized Bed Combustor Project EIS-0289: JEA Circulating Fluidized Bed Combustor Project SUMMARY This EIS assesses environmental issues associated with constructing and demonstrating a project that would be cost-shared by DOE and JEA (formerly the Jacksonville Electric Authority) under the Clean Coal Technology Program. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD December 7, 2000 EIS-0289: Record of Decision JEA Circulating Fluidized Bed Combustor Project, Jacksonville, Duval County, FL June 1, 2000 EIS-0289: Final Environmental Impact Statement JEA Circulating Fluidized Bed Combustor Project August 1, 1999 EIS-0289: Draft Environmental Impact Statement JEA Circulating Fluidized Bed Combustor

471

Collective Effects of Organized Convection and Their Approximation in General Circulation Models  

Science Conference Proceedings (OSTI)

The collective effects of organized convection the environment were estimated using a two-dimensional, two-way nested cloud-resolving numerical model with a large outer domain (4500 km). As initial conditions, the authors used an idealized ...

Xiaoqing Wu; Mitchell W. Moncrieff

1996-05-01T23:59:59.000Z

472

Analysis of Passive Tracer Transport as Modeled by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Tracers without feedback on the atmosphere are used to probe tropospheric transport. Such passive tracers are considered for two important anthropogenic sources, Europe and eastern North America. The linearity of passive tracer continuity allows ...

Mark Holzer

1999-06-01T23:59:59.000Z

473

Internal Versus SST-Forced Atmospheric Variability as Simulated by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The variability of atmospheric flow is analyzed by separating it into an internal part due to atmospheric dynamics only and an external (or forced) part due to the variability of sea surface temperature forcing. The two modes of variability are ...

Ali Harzallah; Robert Sadourny

1995-03-01T23:59:59.000Z

474

Convective Precipitation Variability as a Tool for General Circulation Model Analysis  

Science Conference Proceedings (OSTI)

Precipitation variability is analyzed in two versions of the Community Atmospheric Model (CAM), the standard model, CAM, and a “multiscale modeling framework” (MMF), in which the cumulus parameterization has been replaced with a cloud-resolving ...

Charlotte A. DeMott; David A. Randall; Marat Khairoutdinov

2007-01-01T23:59:59.000Z

475

Density-Driven General Circulation in a Closed Basin Using a Two-Lavel Model  

Science Conference Proceedings (OSTI)

A rectangular-basin ocean, driven by buoyancy and density fluxes in its northern and southern portions, is studied using a two-level model. Only baroclinic motion is induced under the conditions of 1) no wind, 2) neither interfacial nor bottom ...

Motoyoshi Ikeda

1986-05-01T23:59:59.000Z

476

Compensation for the NADW Outflow in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Recent observational study on the compensation for the North Atlantic Deep Water (NADW) outflow suggested that the compensation flow loops into the south Indian Ocean, whereby the compensating water gains heat and salt before returning to the ...

Wenju Cai; Richard J. Greatbatch

1995-02-01T23:59:59.000Z

477

Estimating Meridional Energy Transports by the Atmospheric and Oceanic General Circulations Using Boundary Fluxes  

Science Conference Proceedings (OSTI)

The annual-mean meridional energy transport in the atmosphere–ocean system (total transport) is estimated using 4-yr mean net radiative fluxes at the top of the atmosphere (TOA) calculated from the International Satellite Cloud Climatology ...

Y-C. Zhang; W. B. Rossow

1997-09-01T23:59:59.000Z

478

Effect of a Canopy Interception Reservoir on Hydrological Persistence in a General Circulation Model  

Science Conference Proceedings (OSTI)

Using decadal GCM simulations, the effects of a SVAT (Surface-Vegetation-Atmosphere-Transfer) and a “bucket” land surface parameterization on simulated hydrological persistence are contrasted. The bucket model promotes persistence, as measured by ...

Russell Scott; Randal D. Koster; Dara Entekhabi; Max J. Suarez

1995-07-01T23:59:59.000Z

479

The Structure and Propagation of Intraseasonal Oscillations Appearing in a GFDL General Circulation Model  

Science Conference Proceedings (OSTI)

The three-dimensional structure and temporal evolution of quasi-periodic, planetary-scale tropospheric oscillations simulated by a 15-wavenurnber GCM are investigated by applying cross-spectral, eigenvector, composite and temporal correlation ...

Ngar-Cheung Lau; Ka-Ming Lau

1986-10-01T23:59:59.000Z

480

Variability of the South Atlantic Convergence Zone Simulated by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Interannual and decadal variability of the South Atlantic convergence zone (SACZ) during austral summer [season January–February–March (JFM)] is investigated. An attempt is made to separate the forced variability from the internal variability. ...

Marcelo Barreiro; Ping Chang; R. Saravanan

2002-04-01T23:59:59.000Z

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481

Power-Law and Long-Memory Characteristics of the Atmospheric General Circulation  

Science Conference Proceedings (OSTI)

The question of which statistical model best describes internal climate variability on interannual and longer time scales is essential to the ability to predict such variables and detect periodicities and trends in them. For over 30 yr the ...

Dmitry I. Vyushin; Paul J. Kushner

2009-06-01T23:59:59.000Z

482

A Scheme for Parameterizing Ice-Cloud Water Content in General Circulation Models  

Science Conference Proceedings (OSTI)

The optical properties of ice clouds are a primary issue for climate and climate change. Evaluating these optical properties in three-dimensional models for studying climate will require a method to calculate the ice water content of such clouds. ...

Andrew J. Heymsfield; Leo J. Donner

1990-08-01T23:59:59.000Z

483

Error Estimates for an Ocean General Circulation Model from Altimeter and Acoustic Tomography Data  

Science Conference Proceedings (OSTI)

An offline approach is proposed for the estimation of model and data error covariance matrices whereby covariance matrices of model data residuals are “matched” to their theoretical expectations using familiar least-squares methods. This ...

Dimitris Menemenlis; Michael Chechelnitsky

2000-03-01T23:59:59.000Z

484

Changing the Climate Sensitivity of an Atmospheric General Circulation Model through Cloud Radiative Adjustment  

Science Conference Proceedings (OSTI)

Conducting probabilistic climate projections with a particular climate model requires the ability to vary the model’s characteristics, such as its climate sensitivity. In this study, the authors implement and validate a method to change the ...

Andrei P. Sokolov; Erwan Monier

2012-10-01T23:59:59.000Z

485

Transient Climate Response in Coupled Atmospheric–Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

The equilibrium climate sensitivity (ECS) has a large uncertainty range among models participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) and has recently been presented as “inherently unpredictable.”...

Mao-Chang Liang; Li-Ching Lin; Ka-Kit Tung; Yuk L. Yung; Shan Sun

2013-04-01T23:59:59.000Z

486

Characteristics of the RAW Filtered Leapfrog Time-stepping Scheme in the Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The Robert-Asselin-Williams (RAW) filtered leapfrog scheme is implemented and tested in the Taiwan multi-scale community ocean model (TIMCOM). The characteristics of the RAW filter are carefully examined through two benchmark tests (the classical ...

Chih-Chieh Young; Yu-Chiao Liang; Yu-Heng Tseng; Chun-Hoe Chow

487

SOFAR Floats Reveal Midlatitude Intermediate North Atlantic General Circulation. Part II: An Eulerian Statistical View  

Science Conference Proceedings (OSTI)

Part I of this paper has given a descriptive view of the trajectories of 26 SOFAR floats drifting near 700-m depth in the central North Atlantic during the mid-1980s, as part of the TOPOGULF experiment. Here an Eulerian analysis of the 53.4 ...

Michel Ollitrault; Alain Colin de Verdière

2002-07-01T23:59:59.000Z

488

Interannual Tropical Rainfall Variability in General Circulation Model Simulations Associated with the Atmospheric Model Intercomparison Project  

Science Conference Proceedings (OSTI)

The interannual variability of rainfall over the Indian subcontinent, the African Sahel, and the Nordeste region of Brazil have been evaluated in 32 models for the period 1979–88 as part of the Atmospheric Model Intercomparison Project (AMIP). ...

K. R. Sperber; T. N. Palmer

1996-11-01T23:59:59.000Z

489

Comparison of Two Classical Advection Schemes in a General Circulation Model  

Science Conference Proceedings (OSTI)

The authors compare two classical advection schemes, the centered difference and weighted upcurrent, for coarse-resolution OGCMs, using an idealized ocean basin and a realistic World Ocean topography. For the idealized basin, three experiments ...

Yasuhiro Yamanaka; Ryo Furue; Hiroyasu Hasumi; Nobuo Suginohara

2000-09-01T23:59:59.000Z

490

Scale Dependence of Solar Heating Rates in Convective Cloud Systems with Implications to General Circulation Models  

Science Conference Proceedings (OSTI)

The authors examine 3D solar radiative heating rates within tropical convective–cirrus systems to identify the scales that contribute significantly to the spatial average over a climate model’s grid cell (i.e., its grid mean), and determine their ...

A. M. Vogelmann; V. Ramanathan; I. A. Podgorny

2001-04-01T23:59:59.000Z

491

Using Clustered Climate Regimes to Analyze and Compare Predictions from Fully Coupled General Circulation Models  

Science Conference Proceedings (OSTI)

Changes in Earth’s climate in response to atmospheric greenhouse gas buildup impact the health of terrestrial ecosystems and the hydrologic cycle. The environmental conditions influential to plant and animal life are often mapped as ecoregions, ...

Forrest M. Hoffman; William W. Hargrove Jr.; David J. Erickson III; Robert J. Oglesby

2005-07-01T23:59:59.000Z

492

A New Parameterization of Cloud Droplet Activation Applicable to General Circulation Models  

Science Conference Proceedings (OSTI)

A new parameterization is proposed to link the droplet number concentration to the size distribution and chemical composition of aerosol and updraft velocity. Except for an empirical assumption of droplet growth, the parameterization is ...

Yi Ming; V. Ramaswamy; Leo J. Donner; Vaughan T. J. Phillips

2006-04-01T23:59:59.000Z

493

Ocean Water Clarity and the Ocean General Circulation in a Coupled Climate Model  

Science Conference Proceedings (OSTI)

Ocean water clarity affects the distribution of shortwave heating in the water column. In a one-dimensional time-mean sense, increased clarity would be expected to cool the surface and heat subsurface depths as shortwave radiation penetrates ...

Anand Gnanadesikan; Whit G. Anderson

2009-02-01T23:59:59.000Z

494

The Atlantic Multidecadal Oscillation Inferred from the Forced Climate Response in Coupled General Circulation Models  

Science Conference Proceedings (OSTI)

Instrumental sea surface temperature records in the North Atlantic Ocean are characterized by large multidecadal variability known as the Atlantic multidecadal oscillation (AMO). The lack of strong oscillatory forcing of the climate system at ...

Jeff R. Knight

2009-04-01T23:59:59.000Z

495

An Accurate Spectral Nonorographic Gravity Wave Drag Parameterization for General Circulation Models  

Science Conference Proceedings (OSTI)

An accurate method of solution is developed for the Warner and McIntyre parameterization of nonorographic gravity wave drag for the case of hydrostatic dynamics in the absence of rotation. The new scheme is sufficiently fast that it is suitable ...

John F. Scinocca

2003-02-01T23:59:59.000Z

496

Assimilation of Temperature Profiles in a General Circulation Model of the Tropical Atlantic  

Science Conference Proceedings (OSTI)

Thirty-six hundred temperature profiles collected during 1984 were assimilated into a multilayer primitive equation model of the tropical Atlantic Ocean. The method consists in a monthly correction of the simulated temperature field. Each month, ...

Alain Morliére; Gills Reverdin; Jacques Merle

1989-12-01T23:59:59.000Z

497

Numerical Experiments with a General Circulation Model Concerning the Distribution of Ozone in the Stratosphere  

Science Conference Proceedings (OSTI)

Two experiments were performed with a nine-layer quasi-geostrophic spectral model to simulate the distribution of ozone below 60 km. Experiment I included thermal and orographic forcing of the planetary-scale waves while Experiment II did not ...

R. J. Kurzeja; K. V. Haggard; W. L. Grose

1984-07-01T23:59:59.000Z

498

Subsidence and Upper-Tropospheric Drying along Trajectories in a General Circulation Model  

Science Conference Proceedings (OSTI)

A trajectory analysis of the Community Climate Model version 3 (CCM3) moisture simulation is used to show that the model simulates upper-tropospheric moisture observations better than would be inferred from a traditional geographical comparison. ...

Eric P. Salathé Jr.; Dennis L. Hartmann

2000-01-01T23:59:59.000Z

499

The Extratropical 40-Day Oscillation in the UCLA General Circulation Model. Part II: Spatial Structure  

Science Conference Proceedings (OSTI)

Intraseasonal oscillations in a 3-yr, perpetual-January simulation are examined using a version of the UCLA GCM that produces no self-sustained Madden–Julian oscillation in the Tropics. A robust, 40-day oscillation is found to arise in the model'...

S. L. Marcus; M. Ghil; J. O. Dickey

1996-07-01T23:59:59.000Z

500

Radiative Characteristics of the Canadian Climate Centre Second-Generation General Circulation Model  

Science Conference Proceedings (OSTI)

Several observational datasets were used to assess the quality of the radiative characteristics of the Canadian Climate Centre (CCC) second-generation GCM. The GCM data were obtained from the Atmospheric Model Intercomparison Project (AMIP) ...

Howard W. Barker; Zhanqing Li; Jean-Pierre Blanchet

1994-07-01T23:59:59.000Z