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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

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

16

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

17

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

18

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

19

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

20

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

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

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

22

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

23

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

24

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

25

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

26

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

27

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

28

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

29

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

30

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

31

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

32

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

33

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

34

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

35

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

36

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

37

[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

38

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

39

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

40

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

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

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

42

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

43

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

44

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

45

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

46

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

47

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

48

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

49

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

50

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

51

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

52

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

53

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

54

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

55

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

56

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

57

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

58

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

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

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

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

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

62

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

63

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

64

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

65

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

66

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

67

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

68

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

69

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

70

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

71

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

72

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

73

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

74

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

75

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

76

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

77

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

78

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

79

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

80

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

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

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

82

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

83

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

84

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

85

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

86

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

87

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

88

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

89

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

90

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

91

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

92

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

93

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

94

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

95

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

96

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

97

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

98

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

99

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"

100

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

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

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

102

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

103

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

104

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

105

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

106

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

107

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

108

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

109

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

110

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

111

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

112

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

113

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

114

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

115

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

116

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

117

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

118

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

119

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

120

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

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

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

122

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

123

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

124

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

125

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

126

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

127

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

128

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

129

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

130

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

131

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

132

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

133

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

134

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

135

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

136

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

137

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

138

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

139

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

140

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

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

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

142

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

143

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

144

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

145

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

146

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

147

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

148

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

149

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

150

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

151

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

152

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

153

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...

154

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

155

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

156

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

157

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

158

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

159

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

160

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

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

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

162

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

163

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

164

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

165

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

166

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

167

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

168

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

169

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

170

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

171

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

172

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

173

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

174

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

175

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

176

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

Science Conference Proceedings (OSTI)

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

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

1997-08-01T23:59:59.000Z

177

Application of Adjoint Sensitivity Theory to an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Sensitivity studies with climate models usually involve rerunning the model. Since climate models take so much computer time, this approach can be used to calculate sensitivities to only a few parameters. This work demonstrates the use of a much ...

Matthew C. G. Hall

1986-11-01T23:59:59.000Z

178

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

179

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

180

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

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

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

182

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

183

Modeling the Atmospheric General Circulation Using a Spherical Geodesic Grid: A New Class of Dynamical Cores  

Science Conference Proceedings (OSTI)

This paper documents the development and testing of a new type of atmospheric dynamical core. The model solves the vorticity and divergence equations in place of the momentum equation. The model is discretized in the horizontal using a geodesic ...

Todd D. Ringler; Ross P. Heikes; David A. Randall

2000-07-01T23:59:59.000Z

184

Maintenance of the stratospheric structure in an idealized general circulation model  

Science Conference Proceedings (OSTI)

We explore the maintenance of the stratospheric structure in a primitive equation model that is forced by a Newtonian cooling with a prescribed radiative equilibrium temperature field. Models such as this are well suited to analyze and address ...

M. Jucker; S. Fueglistaler; G. K. Vallis

185

Variability and Coherence of the Agulhas Undercurrent in a High-Resolution Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The Agulhas Current system has been analyzed in a nested high-resolution ocean model and compared to observations. The model shows good performance in the western boundary current structure and the transports off the South African coast. This ...

A. Biastoch; L. M. Beal; J. R. E. Lutjeharms; T. G. D. Casal

2009-10-01T23:59:59.000Z

186

Thermohaline Structure in the Subarctic North Pacific Simulated in a General Circulation Model  

Science Conference Proceedings (OSTI)

The Miami Isopycnic Coordinate Ocean Model configured with 1° horizontal resolution and 23 layers is used to examine processes that maintain the mesothermal structure, a subsurface temperature inversion, in the subarctic North Pacific. The model ...

Takahiro Endoh; Humio Mitsudera; Shang-Ping Xie; Bo Qiu

2004-02-01T23:59:59.000Z

187

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

188

Abyssal Channel Flow in Ocean General Circulation Models with Application to the Vema Channel  

Science Conference Proceedings (OSTI)

An idealized Cox model is shown to pass a flux given by g?H2/2f though a deep channel, single grid-box wide, consistent with analytical models. This flux can, however, be significantly increased or decreased by the presence of density gradients ...

Martin R. Wadley; Grant R. Bigg

1996-01-01T23:59:59.000Z

189

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

190

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

191

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

192

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

193

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

194

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

195

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

196

Forced and Free Variations of the Surface Temperature Field in a General Circulation Model  

Science Conference Proceedings (OSTI)

The concept of “forced” and “free” variations of large-scale surface temperature is examined by analyzing several long runs of the Community Climate Model (CCMO) with idealized boundary conditions and forcing. 1) The planet is all land with ...

Gerald R. North; Kuor-Jier Joseph Yip; Lai-Yung Leung; Robert M. Chervin

1992-03-01T23:59:59.000Z

197

Seasonal Redistribution and Conservation of Atmospheric Mass in a General Circulation Model  

Science Conference Proceedings (OSTI)

A 10-year run was made with a reduced resolution (T40) version of NMC's medium range forecast model. The 12 monthly mean surface pressure fields averaged over 10 years are used to study the climatological seasonal redistribution of mass ...

Huug M. van den Dool; Suranjana Saha

1993-01-01T23:59:59.000Z

198

A Reduced Grid Method for a Parallel Global Ocean General Circulation Model  

DOE Green Energy (OSTI)

A limitation of many explicit finite-difference global climate models is the timestep restriction caused by the decrease in cell size associated with the convergence of meridians near the poles. A computational grid in which the number of cells in the longitudinal direction is reduced toward high-latitudes, keeping the longitudinal width of the resulting cells as uniform as possible and increasing the allowable timestep, is applied to a three-dimensional primitive equation ocean-climate model. This ''reduced'' grid consists of subgrids which interact at interfaces along their northern and southern boundaries, where the resolution changes by a factor of three. Algorithms are developed to extend the finite difference techniques to this interface, focusing on the conservation required to perform long time integrations, while preserving the staggered spatial arrangement of variables and the numerics used on subgrids. The reduced grid eliminates the common alternative of filtering high-frequency modes from the solution at high-latitudes to allow a larger timestep and reduces execution time per model step by roughly 20 percent. The reduced grid model is implemented for parallel computer architectures with two-dimensional domain decomposition and message passing, with speedup results comparable to those of the original model. Both idealized and realistic model runs are presented to show the effect of the interface numerics on the model solution. First, a rectangular, mid-latitude, at-bottomed basin with vertical walls at the boundaries is driven only by surface wind stress to compare three resolutions of the standard grid to reduced grid cases which use various interface conditions. Next, a similar basin with wind stress, heat, and fresh water forcing is used to compare the results of a reduced grid with those of a standard grid result while exercising the full set of model equations. Finally, global model runs, with topography, forcing, and physical parameters similar to those used for ocean-climate studies, are advanced to a near equilibrium state for both the reduced grid and the standard grid. Differences between the two are presented for typical fields of interest, and very little degradation of the solution due to the reduced grid is observed.

Wickett, M.E.

1999-12-01T23:59:59.000Z

199

Cloud/Aerosol Parameterizations: Application and Improvement of General Circulation Models  

Science Conference Proceedings (OSTI)

One of the biggest uncertainties associated with climate models and climate forcing is the treatment of aerosols and their effects on clouds. The effect of aerosols on clouds can be divided into two components: The first indirect effect is the forcing associated with increases in droplet concentrations; the second indirect effect is the forcing associated with changes in liquid water path, cloud morphology, and cloud lifetime. Both are highly uncertain. This project applied a cloud-resolving model to understand the response of clouds under a variety of conditions to changes in aerosols. These responses are categorized according to the large-scale meteorological conditions that lead to the response. Meteorological conditions were sampled from various fields, which, together with a global aerosol model determination of the change in aerosols from present day to pre-industrial conditions, was used to determine a first order estimate of the response of global cloud fields to changes in aerosols. The response of the clouds in the NCAR CAM3 GCM coupled to our global aerosol model were tested by examining whether the response is similar to that of the cloud resolving model and methods for improving the representation of clouds and cloud/aerosol interactions were examined.

Penner, Joyce

2012-06-30T23:59:59.000Z

200

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

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

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

202

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

203

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

204

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

205

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

206

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

207

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

208

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

209

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

210

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

211

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

212

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

213

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

214

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

215

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

216

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

217

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

218

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

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 "general circulation model" 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

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

222

Simulations of the Atmospheric General Circulation Using a Cloud-Resolving Model as a Superparameterization of Physical Processes  

Science Conference Proceedings (OSTI)

Traditionally, the effects of clouds in GCMs have been represented by semiempirical parameterizations. Recently, a cloud-resolving model (CRM) was embedded into each grid column of a realistic GCM, the NCAR Community Atmosphere Model (CAM), to ...

Marat Khairoutdinov; David Randall; Charlotte DeMott

2005-07-01T23:59:59.000Z

223

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

224

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

225

Response of Tropical Cyclones to Idealized Climate Change Experiments in a Global High-Resolution Coupled General Circulation Model  

Science Conference Proceedings (OSTI)

The authors present an assessment of how tropical cyclone activity might change owing to the influence of increased atmospheric carbon dioxide concentrations, using the U.K. High-Resolution Global Environment Model (HiGEM) with N144 resolution (~...

Ray Bell; Jane Strachan; Pier Luigi Vidale; Kevin Hodges; Malcolm Roberts

2013-10-01T23:59:59.000Z

226

Implementing the Delta-Four-Stream Approximation for Solar Radiation Computations in an Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

Proper quantification of the solar radiation budget and its transfer within the atmosphere is of utmost importance in climate modeling. The delta-four-stream (DFS) approximation has been demonstrated to offer a more accurate computational method ...

Tarek Ayash; Sunling Gong; Charles Q. Jia

2008-07-01T23:59:59.000Z

227

Semidiurnal Variations in the Budget of Angular Momentum in a General Circulation Model and in the Real Atmosphere  

Science Conference Proceedings (OSTI)

Diurnal and semidiurnal variations in the budget of atmospheric angular momentum are evident in a simulation by the NCAR Community Climate Model (CCM2). These variations depicted with 20-min time resolution (each time step) are used as guides to ...

Roland A. Madden; Harald Lejenäs; James Hack

1998-08-01T23:59:59.000Z

228

A Comparison of Month-to-Month Persistence of Anomalies in a General Circulation Model and in the Earth's Atmosphere  

Science Conference Proceedings (OSTI)

The output of a 20-year integration of an annual cycle (AC) version of the NCAR Community Climate Model in which the external conditions went through 20 prescribed identical annual cycles is used to study mouth-to-month persistence of anomalies ...

Huug M. Van Den Dool; Robert M. Chervin

1986-07-01T23:59:59.000Z

229

Response of tropical cyclones to idealized climate change experiments in a global high resolution coupled general circulation model  

Science Conference Proceedings (OSTI)

We present an assessment of how tropical cyclone activity might change due to the influence of increased atmospheric carbon dioxide concentrations, using the UK’s High Resolution Global Environment Model (HiGEM) with N144 resolution (~90 km in the ...

Ray Bell; Jane Strachan; Pier Luigi Vidale; Kevin Hodges; Malcolm Roberts

230

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

231

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

232

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

233

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

234

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

235

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

236

A Global Climatology of Albedo, Roughness Length and Stomatal Resistance for Atmospheric General Circulation Models as Represented by the Simple Biosphere Model (SiB)  

Science Conference Proceedings (OSTI)

Components of the Simple Biosphere Model (SiB) of Sellers et al. were used to generate global monthly fields of surface albedo (0.4–4.0 ?m), roughness length and minimum surface (stomatal) resistance.

J. L. Dorman; P. J. Sellers

1989-09-01T23:59:59.000Z

237

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

238

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

239

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

240

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

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

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

242

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

243

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

244

GFDL ARM Project Technical Report: Using ARM Observations to Evaluate Cloud and Convection Parameterizations & Cloud-Convection-Radiation Interactions in the GFDL Atmospheric General Circulation Model  

SciTech Connect

This report briefly summarizes the progress made by ARM postdoctoral fellow, Yanluan Lin, at GFDL during the period from October 2008 to present. Several ARM datasets have been used for GFDL model evaluation, understanding, and improvement. This includes a new ice fall speed parameterization with riming impact and its test in GFDL AM3, evaluation of model cloud and radiation diurnal and seasonal variation using ARM CMBE data, model ice water content evaluation using ARM cirrus data, and coordination of the TWPICE global model intercomparison. The work illustrates the potential and importance of ARM data for GCM evaluation, understanding, and ultimately, improvement of GCM cloud and radiation parameterizations. Future work includes evaluation and improvement of the new dynamicsPDF cloud scheme and aerosol activation in the GFDL model.

V. Ramaswamy; L. J. Donner; J-C. Golaz; S. A. Klein

2010-06-17T23:59:59.000Z

245

A Comparison of Australian Open Water Body Evaporation Trends for Current and Future Climates Estimated from Class A Evaporation Pans and General Circulation Models  

Science Conference Proceedings (OSTI)

Trends of decreasing pan evaporation around the world have renewed interest in evaporation and its behavior in a warming world. Observed pan evaporation around Australia has been modeled to attribute changes in its constituent variables. It is ...

Fiona Johnson; Ashish Sharma

2010-02-01T23:59:59.000Z

246

The Role of Horizontal Boundaries in Parameter Sensitivity and Decadal-Scale Variability of Coarse-Resolution Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

Coarse-resolution f-plane and ?-plane frictional geostrophic models are used to study the response to restored surface buoyancies and fixed surface buoyancy fluxes. With restored surface buoyancies it is found that the overturning and meridional ...

Michael Winton

1996-03-01T23:59:59.000Z

247

How Well Do Atmospheric General Circulation Models Capture the Leading Modes of the Interannual Variability of the Asian–Australian Monsoon?  

Science Conference Proceedings (OSTI)

The authors evaluate the performances of 11 AGCMs that participated in the Atmospheric Model Intercomparison Project II (AMIP II) and that were run in an AGCM-alone way forced by historical sea surface temperature covering the period 1979–99 and ...

Tianjun Zhou; Bo Wu; Bin Wang

2009-03-01T23:59:59.000Z

248

Explorations of the Annual Mean Heat Budget of the Tropical Indian Ocean. Part II: Studies with a Simplified Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Present-day OGCMs give low values of annual mean net heat flux (AMNHF) in the tropical Indian Ocean, compared to climatologies. AMNHF generation is examined in an open-boundary model of this region with realistic coastlines. In the first two of ...

Rui-Jin Hu; J. Stuart Godfrey

2007-07-01T23:59:59.000Z

249

Representation of Subgrid-Scale Orographic Effects in a General Circulation Model. Part I: Impact on the Dynamics of Simulated January Climate  

Science Conference Proceedings (OSTI)

Effects of subgrid-scale orography are represented in most large-scale models of the atmosphere by means of parameterizing subgrid-scale orographic gravity wave drag and/or enhancing grid-scale orography, such as ‘envelope orography,’ with the ...

Young-Joon Kim

1996-11-01T23:59:59.000Z

250

Development of a Two-Dimensional Zonally Averaged Statistical-Dynamical Model. Part I The Parameterization of Moist Convection and its Role in the General Circulation  

Science Conference Proceedings (OSTI)

The moist convection parameterization used in the GISS 3-D GCM is adapted for use in a two-dimensional (2-D) zonally averaged statisticai-dynamical model. Experiments with different versions of the parameterization show that its impact on the ...

Mao-Sung Yao; Peter H. Stone

1987-01-01T23:59:59.000Z

251

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

252

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

253

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

254

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...

255

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

256

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

257

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

258

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

259

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

260

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

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

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

262

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

263

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

264

COMPUTATIONAL MODELING OF CIRCULATING FLUIDIZED BED REACTORS  

Science Conference Proceedings (OSTI)

Details of numerical simulations of two-phase gas-solid turbulent flow in the riser section of Circulating Fluidized Bed Reactor (CFBR) using Computational Fluid Dynamics (CFD) technique are reported. Two CFBR riser configurations are considered and modeled. Each of these two riser models consist of inlet, exit, connecting elbows and a main pipe. Both riser configurations are cylindrical and have the same diameter but differ in their inlet lengths and main pipe height to enable investigation of riser geometrical scaling effects. In addition, two types of solid particles are exploited in the solid phase of the two-phase gas-solid riser flow simulations to study the influence of solid loading ratio on flow patterns. The gaseous phase in the two-phase flow is represented by standard atmospheric air. The CFD-based FLUENT software is employed to obtain steady state and transient solutions for flow modulations in the riser. The physical dimensions, types and numbers of computation meshes, and solution methodology utilized in the present work are stated. Flow parameters, such as static and dynamic pressure, species velocity, and volume fractions are monitored and analyzed. The differences in the computational results between the two models, under steady and transient conditions, are compared, contrasted, and discussed.

Ibrahim, Essam A

2013-01-09T23:59:59.000Z

265

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

266

Thermohaline Circulation Studies with an Isopycnic Coordinate Ocean Model  

Science Conference Proceedings (OSTI)

The thermohaline circulation (THC) in a 1000-yr near-global numerical simulation using the Miami Isopycnic Coordinate Ocean Model is analyzed and compared to observations. The model, driven by observed monthly atmospheric climatology, uses ...

Shan Sun; Rainer Bleck

2001-09-01T23:59:59.000Z

267

Southern Ocean Circulation and Eddy Compensation in CMIP5 Models  

Science Conference Proceedings (OSTI)

Thirteen state-of-the-art climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are used to evaluate the response of the Antarctic Circumpolar Current (ACC) transport and Southern Ocean meridional overturning circulation ...

Stephanie M. Downes; Andrew McC. Hogg

2013-09-01T23:59:59.000Z

268

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

269

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

270

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

271

Semi-Lagrangian Advection Algorithms for Ocean Circulation Models  

Science Conference Proceedings (OSTI)

The semi-Lagrangian adveation scheme is applied to the meridional-plane model of the thermohaline circulation developed by Marotzke et al., whose governing equations are solved under a variety of boundary conditions. To determine the extent to ...

Salil Kumar Das; Andrew J. Weaver

1995-08-01T23:59:59.000Z

272

A Model of Wind- and Buoyancy-Driven Ocean Circulation  

Science Conference Proceedings (OSTI)

A layered model of steady geostrophic ocean circulation driven by wind stress and buoyancy flux at the surface is derived. Potential vorticity, or thickness, of the two near-surface layers is driven by Ekman pumping and buoyancy pumping. The ...

Roland A. De Szoeke

1995-05-01T23:59:59.000Z

273

A frequency domain finite element model for tidal circulation  

E-Print Network (OSTI)

A highly efficient finite element model has been developed for the numerical prediction of depth average circulation within small scale embayments which are often characterized by irregular boundaries and bottom topography.

Westerink, Joannes J.

1985-01-01T23:59:59.000Z

274

A Laboratory Model of Vertical Ocean Circulation Driven by Mixing  

Science Conference Proceedings (OSTI)

A model of deep ocean circulation driven by turbulent mixing is produced in a long, rectangular laboratory tank. The salinity difference is substituted for the thermal difference between tropical and polar regions. Freshwater gently flows in at ...

J. A. Whitehead; Wei Wang

2008-05-01T23:59:59.000Z

275

Vorticity Dynamics and Zonally Averaged Ocean Circulation Models  

Science Conference Proceedings (OSTI)

Diagnostic equations relating the zonally averaged overturning circulation to north–south density variations are derived and used to determine a new closure scheme for use in zonally averaged ocean models. The presentation clarifies the dynamical ...

Daniel G. Wright; Cornelis B. Vreugdenhil; Tertia M. C. Hughes

1995-09-01T23:59:59.000Z

276

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

277

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

278

A Simplified Model of the Modified Hadley Circulation  

Science Conference Proceedings (OSTI)

A model is developed to find the low-latitude upper-tropospheric atmospheric circulation which would exist in the absence of transient eddies. The forcing in the model is zonally asymmetric to take into account the effect of the distribution of ...

Edwin K. Schneider

1987-11-01T23:59:59.000Z

279

Optimal control of CPR procedure using hemodynamic circulation model  

DOE Patents (OSTI)

A method for determining a chest pressure profile for cardiopulmonary resuscitation (CPR) includes the steps of representing a hemodynamic circulation model based on a plurality of difference equations for a patient, applying an optimal control (OC) algorithm to the circulation model, and determining a chest pressure profile. The chest pressure profile defines a timing pattern of externally applied pressure to a chest of the patient to maximize blood flow through the patient. A CPR device includes a chest compressor, a controller communicably connected to the chest compressor, and a computer communicably connected to the controller. The computer determines the chest pressure profile by applying an OC algorithm to a hemodynamic circulation model based on the plurality of difference equations.

Lenhart, Suzanne M. (Knoxville, TN); Protopopescu, Vladimir A. (Knoxville, TN); Jung, Eunok (Seoul, KR)

2007-12-25T23:59:59.000Z

280

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

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

A Vertically Averaged Circulation Model Using Boundary-Fitted Coordinates  

Science Conference Proceedings (OSTI)

A two-dimensional vertically averaged circulation model using boundary-fitted coordinates has been developed for predicting sea level and currants in estuarine and shelf waters. The basic idea of the approach is to use a set of coupled quasi-...

Malcolm L. Spaulding

1984-05-01T23:59:59.000Z

282

Exact Solutions to Kawase's Linear Model of Deep Ocean Circulation  

Science Conference Proceedings (OSTI)

Exact solutions are found for Kawase's linear, two-layer model of mass-driven deep-ocean circulation. It is demonstrated that for strong damping, even though the deep western boundary current (DWBC) bifurcates at the equator as found in Kawase's ...

Dailin Wang; Dennis W. Moore; Lewis M. Rothstein

1994-10-01T23:59:59.000Z

283

Computable General Equilibrium Models for Sustainability Impact...  

Open Energy Info (EERE)

Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Jump to: navigation, search Name Computable General Equilibrium Models for...

284

Thermohaline Circulation Stability: A Box Model Study. Part II: Coupled Atmosphere–Ocean Model  

Science Conference Proceedings (OSTI)

A thorough analysis of the stability of a coupled version of an interhemispheric three-box model of thermohaline circulation (THC) is presented. This study follows a similarly structured analysis of an uncoupled version of the same model ...

Valerio Lucarini; Peter H. Stone

2005-02-01T23:59:59.000Z

285

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

286

Modeling of a coal-fired natural circulation boiler  

SciTech Connect

Modeling of a natural circulation boiler for a coal-fired thermal power station is presented here. The boiler system is divided into seven subcomponents, and for each section, models based on conservation of mass, momentum, and energy are formulated. The pressure drop at various sections and the heat transfer coefficients are computed using empirical correlations. Solutions are obtained by using SIMULINK. The model is validated by comparing its steady state and dynamic responses with the actual plant data. Open loop responses of the model to the step changes in the operating parameters, such as pressure, temperature, steam flow, feed water flow, are also analyzed. The present model can be used for the development and design of effective boiler control systems.

Bhambare, K.S.; Mitra, S.K.; Gaitonde, U.N. [Indian Institute of Technology, Bombay (India). Dept. of Mechanical Engineering

2007-06-15T23:59:59.000Z

287

A Modeling Study of Circulation and Eddies in the Persian Gulf  

Science Conference Proceedings (OSTI)

The circulation and mesoscale eddies in the Persian Gulf are investigated using results from a high-resolution (1 km) Hybrid Coordinate Ocean Model (HYCOM). The circulation in the Persian Gulf is composed of two spatial scales: basin scale and ...

Prasad G. Thoppil; Patrick J. Hogan

2010-09-01T23:59:59.000Z

288

Two-Layer Model of Summer Circulation on the Southeast U.S. Continental Shelf  

Science Conference Proceedings (OSTI)

The summer circulation in the South Atlantic Bight is investigated using a two-layer finite element model. Simulations using a steady state mean summer wind field lead to the following conclusions. (i) the adjustment time of the shelf circulation ...

Joao A. Lorenzzetti; John D. Wang; Thomas N. Lee

1988-04-01T23:59:59.000Z

289

A Simple Model of a Convectively Coupled Walker Circulation Using the Weak Temperature Gradient Approximation  

Science Conference Proceedings (OSTI)

An idealized model of a Walker circulation based on the weak temperature gradient (WTG) approximation and a single baroclinic vertical mode for all fields is analyzed. The circulation is forced by a sinusoidal variation of sea surface temperature ...

Christopher S. Bretherton; Adam H. Sobel

2002-10-01T23:59:59.000Z

290

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

291

Transformation between radial generalized Higgs model and generalized CRS model with application to quasi-exactly solvable generalized Higgs model  

E-Print Network (OSTI)

In this paper, we present a coordinate transformation between the generalized Carinena-Ranada-Santander model and the radial generalized Higgs model. Furthermore, based on this transformation, we obtain a series of quasi-exactly solvable potential of the two-dimensional generalized Higgs model.

Ci Song; Yan Li; Jing-Ling Chen

2013-09-23T23:59:59.000Z

292

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

293

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

294

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

295

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

296

Stable Schemes for Nonlinear Vertical Diffusion in Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

The intensity of vertical mixing in atmospheric models generally depends on wind shear and static stability, making the diffusion process nonlinear. Traditional implicit numerical schemes, which treat the variables to be diffused implicitly but ...

Claude Girard; Yves Delage

1990-03-01T23:59:59.000Z

297

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

298

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

299

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

300

Generalization of Lambert's reflectance model  

Science Conference Proceedings (OSTI)

Lambert's model for body reflection is widely used in computer graphics. It is used extensively by rendering techniques such as radiosity and ray tracing. For several real-world objects, however, Lambert's model can prove to be a very inaccurate approximation ... Keywords: BRDF, Lambert's model, moon reflectance, reflection models, rough surfaces

Michael Oren; Shree K. Nayar

1994-07-01T23:59:59.000Z

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

Thermohaline Circulation Stability: A Box Model Study. Part I: Uncoupled Model  

Science Conference Proceedings (OSTI)

A thorough analysis of the stability of the uncoupled Rooth interhemispheric three-box model of thermohaline circulation (THC) is presented. The model consists of a northern high-latitude box, a tropical box, and a southern high-latitude box, ...

Valerio Lucarini; Peter H. Stone

2005-02-01T23:59:59.000Z

302

A Model for the Vertial Circulation of the Baltic Deep Water  

Science Conference Proceedings (OSTI)

The time-dependent vertical circulation of the Baltic Proper is modeled using a horizontally integrated model of high vertical resolution. A seasonal pycnocline model computes the properties of the mixed layer. Below this an advection-vertical ...

Anders Stigebrandt

1987-10-01T23:59:59.000Z

303

Transition to Aperiodic Variability in a Wind-Driven Double-Gyre Circulation Model  

Science Conference Proceedings (OSTI)

Multiple equilibria as well as periodic and aperiodic solution regimes are obtained in a barotropic model of the midlatitude ocean’s double-gyre circulation. The model circulation is driven by a steady zonal wind profile that is symmetric with ...

Kyung-Il Chang; Michael Ghil; Kayo Ide; Chung-Chieng Aaron Lai

2001-05-01T23:59:59.000Z

304

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

305

An Open Boundary Condition for Numerical Coastal Circulation Models  

Science Conference Proceedings (OSTI)

Open boundaries (OBs) are usually unavoidable in numerical coastal circulation simulations. At OBs, an appropriate open boundary condition (OBC) is required so that outgoing waves freely pass to the exterior without creating reflections back into ...

Peifeng Ma; Ole Secher Madsen

2011-12-01T23:59:59.000Z

306

Atmospheric Transports, the Thermohaline Circulation, and Flux Adjustments in a Simple Coupled Model  

Science Conference Proceedings (OSTI)

A theoretical analysis of the interactions between atmospheric meridional transports and the thermohaline circulation is presented, using a four-box ocean-atmosphere model in one hemisphere. The model is a simplified version of that developed by ...

Jochem Marotzke; Peter H. Stone

1995-06-01T23:59:59.000Z

307

On the Midlatitude Circulation in a High-Resolution Model of the North Atlantic  

Science Conference Proceedings (OSTI)

This paper describes, and establishes the dynamical mechanisms responsible for, the large-scale, time-mean, midlatitude circulation in a high-resolution model of the North Atlantic basin. The model solution is compared with recently proposed ...

Frank O. Bryan; Claus W. Böning; William R. Holland

1995-03-01T23:59:59.000Z

308

Atlantic Meridional Overturning Circulation (AMOC) in CMIP5 Models: RCP and Historical Simulations  

Science Conference Proceedings (OSTI)

The Atlantic meridional overturning circulation (AMOC) simulated by 10 models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) for the historical (1850–2005) and future climate is examined. The historical simulations of the AMOC ...

Wei Cheng; John C. H. Chiang; Dongxiao Zhang

2013-09-01T23:59:59.000Z

309

A Simple Model of Abyssal Circulation, Including Effects of Wind, Buoyancy and Topography  

Science Conference Proceedings (OSTI)

We examine problems of steady abyssal circulation using an inviscid planetary geostrophic layered model. The model includes an active wind-driven upper layer and arbitrary topography; forcing is in the form of specified interlayer mass fluxes ...

Susan L. Hautala; Stephen C. Riser

1989-05-01T23:59:59.000Z

310

A Model Study of the Buoyancy-Driven Circulation in the Gulf of Maine  

Science Conference Proceedings (OSTI)

A quasi-linear prognostic numerical model has been used to study the three-dimensional baroclinic circulation in the Gulf of Maine region, with a focus on the buoyancy-driven circulation in the inner basins and near the coast where the influence ...

David A. Brooks

1994-11-01T23:59:59.000Z

311

Modeling International Relationships in Applied General Equilibrium  

Open Energy Info (EERE)

Modeling International Relationships in Applied General Equilibrium Modeling International Relationships in Applied General Equilibrium (MIRAGE) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: Modeling International Relationships in Applied General Equilibrium (MIRAGE) Agency/Company /Organization: International Food Policy Research Institute, Centre d'Etudes Prospectives et d'Informations Internationales (CEPII) Focus Area: Economic Development Topics: Co-benefits assessment, - Macroeconomic Resource Type: Software/modeling tools User Interface: Desktop Application Complexity/Ease of Use: Moderate Website: www.ifpri.org/book-5076/ourwork/program/mirage-model RelatedTo: Global Trade Analysis Project (GTAP) Data Base

312

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

313

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

314

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

315

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

316

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

317

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

318

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

319

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

320

Circulation Sensitivity to Heating in a Simple Model of Baroclinic Turbulence  

Science Conference Proceedings (OSTI)

This paper examines the sensitivity of the circulation of an idealized primitive equation two-level model on the form and strength of the heating, aiming to understand the qualitatively different sensitivity of the isentropic slope on ...

Pablo Zurita-Gotor; Geoffrey K. Vallis

2010-05-01T23:59:59.000Z

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

The Influence of Hadley Circulation Intensity Changes on Extratropical Climate in an Idealized Model  

Science Conference Proceedings (OSTI)

Experiments have been performed using a simple global model with idealized physics and zonally symmertrical forcings to investigate the influence of Hadley circulation intensity changes on extratropical climate. The heating within the Tropics is ...

Edmund K. M. Chang

1995-06-01T23:59:59.000Z

322

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

323

Noise-Induced Transitions in a Simplified Model of the Thermohaline Circulation  

Science Conference Proceedings (OSTI)

A simplified box ocean model for the North Atlantic is used to study the influence of multiplicative short-term climate variability on the stability and long-term dynamics of the North Atlantic thermohaline circulation. A timescale separation ...

Axel Timmermann; Gerrit Lohmann

2000-08-01T23:59:59.000Z

324

Axisymmetric Circulations Forced by Heat and Momentum Sources: A Simple Model Applicable to the Venus Atmosphere  

Science Conference Proceedings (OSTI)

The parametric behavior of an axially symmetric circulation induced by heat and momentum sources is analyzed in the context of a simple Boussinesq model. Implications for the Venus atmosphere are examined in the light of recent data.

Arthur Y. Hou

1984-12-01T23:59:59.000Z

325

Atlantic Meridional Overturning Circulation (AMOC) in CMIP5 models: RCP and Historical Simulations  

Science Conference Proceedings (OSTI)

We examine the Atlantic Meridional Overturning Circulation (AMOC) simulated by ten CMIP5 models for the historical (1850-2005) and future climate. The historical simulations of the AMOC mean state are more closely matched to observations than ...

Wei Cheng; John C. H. Chiang; Dongxiao Zhang

326

An Eclectic Atlantic Ocean Circulation Model. Part I: The Meridional Flux of Heat  

Science Conference Proceedings (OSTI)

A model of the Atlantic has been formulated that combines ordinary quasi-geostrophic constraints (based upon the dynamic method and Ekman layer) with a great variety of additional information available about the time-average ocean circulation. ...

Carl Wunsch

1984-11-01T23:59:59.000Z

327

A Quasi-Equilibrium Tropical Circulation Model—Implementation and Simulation  

Science Conference Proceedings (OSTI)

The quasi-equilibrium tropical circulation model (QTCM1) is implemented and tested. The formulation, described by Neelin and Zeng, uses a Galerkin framework in the vertical, but with basis functions tailored to quasi-equilibrium deep convective ...

Ning Zeng; J. David Neelin; Chia Chou

2000-06-01T23:59:59.000Z

328

Surface Turbulent Flux Formulation in Stable Conditions for Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

The forty-day Wangara data set is used to discuss the applicability of the traditional formulations for the surface fluxes for atmospheric circulation models. It is shown that, while in unstable conditions the surface layer relationships can be ...

Yves Delage

1985-01-01T23:59:59.000Z

329

Surface Temperature Calculation in Atmospheric Circulation Models with Coarse Resolution of the Boundary Layer  

Science Conference Proceedings (OSTI)

A parameterization of the surface nocturnal inversion of temperature is proposed to enable atmospheric circulation models to handle the surface energy budget without having to resolve the boundary layer. The scheme allows a wide range of vertical ...

Yves Delage

1986-02-01T23:59:59.000Z

330

Diagnostic Model of the Three-Dimensional Circulation in the Upper Equatorial Pacific Ocean  

Science Conference Proceedings (OSTI)

To investigate the processes that maintain the large-scale, annual-average thermal structure of the equatorial Pacific, the three-dimensional ocean circulation for a large area is determined from a diagnostic model applied to repeated, meridional ...

Harry L. Bryden; Esther C. Brady

1985-10-01T23:59:59.000Z

331

A Diagnostic Coastal Circulation Model with Application to Conception Bay, Newfoundland  

Science Conference Proceedings (OSTI)

A diagnostic circulation model is developed for application to coastal regions. The three-dimensional velocity field can be calculated from a specified density field and wind-stress distribution provided transport is given on boundaries where f/H ...

Brad de Young; Richard J. Greatbatch; Kenneth B. Forward

1993-12-01T23:59:59.000Z

332

Chemistry–Climate Model Simulations of Twenty-First Century Stratospheric Climate and Circulation Changes  

Science Conference Proceedings (OSTI)

The response of stratospheric climate and circulation to increasing amounts of greenhouse gases (GHGs) and ozone recovery in the twenty-first century is analyzed in simulations of 11 chemistry–climate models using near-identical forcings and ...

Neal Butchart; I. Cionni; V. Eyring; T. G. Shepherd; D. W. Waugh; H. Akiyoshi; J. Austin; C. Brühl; M. P. Chipperfield; E. Cordero; M. Dameris; R. Deckert; S. Dhomse; S. M. Frith; R. R. Garcia; A. Gettelman; M. A. Giorgetta; D. E. Kinnison; F. Li; E. Mancini; C. McLandress; S. Pawson; G. Pitari; D. A. Plummer; E. Rozanov; F. Sassi; J. F. Scinocca; K. Shibata; B. Steil; W. Tian

2010-10-01T23:59:59.000Z

333

Idealized Annually Averaged Macroturbulent Hadley Circulation in a Shallow-Water Model  

Science Conference Proceedings (OSTI)

The interaction of midlatitude eddies and the thermally driven Hadley circulation is studied using an idealized shallow-water model on the rotating sphere. The contributions of the annually averaged differential heating, vertical advection of ...

Ori Adam; Nili Harnik

2013-01-01T23:59:59.000Z

334

Model projections of the changes in atmospheric circulation and surface climate over North America, North Atlantic and Europe in the 21st century  

Science Conference Proceedings (OSTI)

The impacts of climate change on the North America-North Atlantic-Europe sector are studied using a coupled general circulation model (CM3) and a high-resolution atmosphere-only model (HiRAM), both developed at the Geophysical Fluid Dynamics ...

Ngar-Cheung Lau; Jeffrey J. Ploshay

335

Dirichlet Process Mixtures of Generalized Linear Models  

Science Conference Proceedings (OSTI)

We propose Dirichlet Process mixtures of Generalized Linear Models (DP-GLM), a new class of methods for nonparametric regression. Given a data set of input-response pairs, the DP-GLM produces a global model of the joint distribution through a mixture ...

Lauren A. Hannah; David M. Blei; Warren B. Powell

2011-02-01T23:59:59.000Z

336

A Simplified Model of the Walker Circulation with an Interactive Ocean Mixed Layer and Cloud-Radiative Feedbacks  

Science Conference Proceedings (OSTI)

Cloud–climate feedbacks between precipitation, radiation, circulation strength, atmospheric temperature and moisture, and ocean temperature are studied with an idealized model of the Walker circulation in a nonrotating atmosphere coupled to an ...

Matthew E. Peters; Christopher S. Bretherton

2005-10-01T23:59:59.000Z

337

The Atmospheric Response to a Thermohaline Circulation Collapse: Scaling Relations for the Hadley Circulation and the Response in a Coupled Climate Model  

Science Conference Proceedings (OSTI)

The response of the tropical atmosphere to a collapse of the thermohaline circulation (THC) is investigated by comparing two 5-member ensemble runs with a coupled climate model (CCM), the difference being that in one ensemble a hosing experiment ...

Sybren S. Drijfhout

2010-02-01T23:59:59.000Z

338

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

339

On generalized P\\'olya urn models  

E-Print Network (OSTI)

We study an urn model introduced in the paper of Chen and Wei, where at each discrete time step $m$ balls are drawn at random from the urn containing colors white and black. Balls are added to the urn according to the inspected colors, generalizing the well known P\\'olya-Eggenberger urn model, case m=1. We provide exact expressions for the expectation and the variance of the number of white balls after n draws, and determine the structure of higher moments. Moreover, we discuss extensions to more than two colors. Furthermore, we introduce and discuss a new urn model where the sampling of the m balls is carried out in a step-by-step fashion, and also introduce a generalized Friedman's urn model.

Chen, May-Ru

2011-01-01T23:59:59.000Z

340

Approximate deconvolution large eddy simulation of a barotropic ocean circulation model  

E-Print Network (OSTI)

This paper puts forth a new large eddy simulation closure modeling strategy for two-dimensional turbulent geophysical flows. This closure modeling approach utilizes approximate deconvolution, which is based solely on mathematical approximations and does not employ phenomenological arguments, such as the concept of an energy cascade. The new approximate deconvolution model is tested in the numerical simulation of the wind-driven circulation in a shallow ocean basin, a standard prototype of more realistic ocean dynamics. The model employs the barotropic vorticity equation driven by a symmetric double-gyre wind forcing, which yields a four-gyre circulation in the time mean. The approximate deconvolution model yields the correct four-gyre circulation structure predicted by a direct numerical simulation, on a much coarser mesh but at a fraction of the computational cost. This first step in the numerical assessment of the new model shows that approximate deconvolution could represent a viable alternative to standar...

San, Omer; Wang, Zhu; Iliescu, Traian

2011-01-01T23:59:59.000Z

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

Money Exchange Model and a general Outlook  

E-Print Network (OSTI)

The Kinetic Gas Theory like two-agent money exchange models, recently introduced in the Econophysics of Wealth distributions, are revisited. The emergence of Boltzmann-Gibbs like distribution of individual money to Pareto's law in the tail of the distribution is examined in terms of 2x2 Transition matrix with a general and simple oulook. Some additional interesting results are also reported.

Gupta, A K

2005-01-01T23:59:59.000Z

342

Steady-State Diagnostic Model of Summer Mean Circulation on the Georgia Shelf  

Science Conference Proceedings (OSTI)

The Galt (1975) diagnostic model was used to investigate summer circulation on the Georgia shelf. The steady-state model uses a finite-element method to solve the depth-integrated vorticity equation for sea surface elevation over the model domain ...

Thomas N. Lee; Ernest Daddio; Gregory C. Han

1982-08-01T23:59:59.000Z

343

A Generalized Streaming Model for Concurrent Computing  

E-Print Network (OSTI)

Multicore parallel programming has some very difficult problems such as deadlocks during synchronizations and race conditions brought by concurrency. Added to the difficulty is the lack of a simple, well-accepted computing model for multicore architectures--because of that it is hard to develop powerful programming environments and debugging tools. To tackle the challenges, we promote a generalized stream computing model, inspired by previous researches on stream computing, that unifies parallelization strategies for programming language design, compiler design and operating system design. Our model provides a high-level abstraction in designing language constructs to convey concepts of concurrent operations, in organizing a program's runtime layout for parallel execution, and in scheduling concurrent instruction blocks through runtime and/or operating systems. In this paper, we give a high-level description of the proposed model: we define the foundation of the model, show its simplicity through algebraic/co...

Wang, Yibing

2010-01-01T23:59:59.000Z

344

Circulation Regimes due to Attractor Merging in Atmospheric Models  

Science Conference Proceedings (OSTI)

From a dynamical systems theory perspective, the mechanisms of atmospheric regime behavior in a barotropic model, a pseudobarotropic model, and a baroclinic three-level model, where all of them show quite realistic regimes, are unveiled. Along ...

Mario Sempf; Klaus Dethloff; Dörthe Handorf; Michael V. Kurgansky

2007-06-01T23:59:59.000Z

345

A Model Study of the Seasonal Circulation in the Gulf of Maine  

Science Conference Proceedings (OSTI)

The Princeton Ocean Model is used to study the circulation in the Gulf of Maine and its seasonal transition in response to wind, surface heat flux, river discharge, and the M2 tide. The model has an orthogonal-curvature linear grid in the ...

Huijie Xue; Fei Chai; Neal R. Pettigrew

2000-05-01T23:59:59.000Z

346

A Quasi-Geostrophic Circulation Model of the Northeast Pacific. Part I: A Preliminary Numerical Experiment  

Science Conference Proceedings (OSTI)

A limited-area quasi-geostrophic numerical model with mesoscale resolution is developed to study the circulation in the northeast (NE) Pacific Ocean. The model domain extends from the British Columbia-Alaska coast out to 170°W and down to 45°N, ...

Patrick F. Cummins; Lawrence A. Mysak

1988-09-01T23:59:59.000Z

347

CANDIE: A New Version of the DieCAST Ocean Circulation Model  

Science Conference Proceedings (OSTI)

The development and verification of a new version of the DieCAST ocean circulation model to be referred to as CANDIE (Canadian Diecast) are considered. Both CANDIE and DieCAST have many features in common with the well-known Modular Ocean Model (...

Jinyu Sheng; Daniel G. Wright; Richard J. Greatbatch; David E. Dietrich

1998-12-01T23:59:59.000Z

348

Response of the Atlantic Thermohaline Circulation to Increased Atmospheric CO2 in a Coupled Model  

Science Conference Proceedings (OSTI)

Changes in the thermohaline circulation (THC) due to increased CO2 are important in future climate regimes. Using a coupled climate model, the Parallel Climate Model (PCM), regional responses of the THC in the North Atlantic to increased CO2 and ...

Aixue Hu; Gerald A. Meehl; Warren M. Washington; Aiguo Dai

2004-11-01T23:59:59.000Z

349

Michael Cox (1941–1989): His Pioneering Contributions to Ocean Circulation Modeling  

Science Conference Proceedings (OSTI)

Michael Cox was a pioneer in the development and application of numerical models to the study of the ocean circulation. His simulation of the response of the Indian Ocean to the monsoons was one of the first applications of a numerical model to ...

Kirk Bryan

1991-09-01T23:59:59.000Z

350

Multiple Equilibria of the Hadley Circulation in an Intermediate-Complexity Axisymmetric Model  

Science Conference Proceedings (OSTI)

A model of intermediate complexity based on quasi-equilibrium theory—a version of the Quasi-Equilibrium Tropical Circulation Model with a prognostic atmospheric boundary layer, as well as two free-tropospheric modes in momentum, and one each in ...

Gilles Bellon; Adam H. Sobel

2010-04-01T23:59:59.000Z

351

Modelling the Mean Barotropic Circulation in the Bay of Fundy and Gulf of Maine  

Science Conference Proceedings (OSTI)

Two dimensional, nonlinear numerical models are used to study the residual barotropic circulation generated by tides and steady winds in the Bay of Fundy and Gulf of Maine. The first a multi-grid model, is used to examine the Bay of Fundy with a ...

David A. Greenberg

1983-05-01T23:59:59.000Z

352

Ocean heat uptake in eddying and non-eddying ocean circulation models in a warming climate  

Science Conference Proceedings (OSTI)

Ocean heat uptake is explored with non-eddying (2°), eddy-permitting (0.25°) and eddy-resolving (0.125°) ocean circulation models in a domain representing the Atlantic basin connected to a southern circumpolar channel with flat bottom. The model ...

Yu Zhang; Geoffrey K. Vallis

353

Development of a Three-Dimensional, Limited-Area (Island) Shelf Circulation Model  

Science Conference Proceedings (OSTI)

A three-dimensional, finite-difference model is developed to study limited-area (island) shelf circulation. The model uses a semi-implicit scheme in the cross-shore dimension and a mode-splitting technique in the vertical dimension, to achieve ...

Dong-Ping Wang

1982-07-01T23:59:59.000Z

354

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

355

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

356

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

357

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

358

PICASSO: A GENERAL INTERACTIVE GRAPHICS MODELING PROGRAM.  

DOE Green Energy (OSTI)

This report is intended to serve as a user's manual for PICASSO. The detailed description of the concepts involved and the methods used in implementing those concepts will be treated in a subsequent paper and are incorporated in the Ph.D. thesis of one of the authors. The program evolved from earlier work on a graphics program for printed circuit board design which had a fixed library of elements. The need for a dynamic graphics program (i.e., one which allows the creation of new elements as required) soon became obvious, and the generality of such a program for mathematical modeling was a major factor in the development of PICASSO. It was thought that the present stage of development of this modeling program had reached a point that a report such as this would be useful in creating a broader interest in the field. However, work continues to further generalize the program into such areas as computer animation, 3-D display and modeling, and a more general interface to available ''analysis'' routines, such as the available compilers and interpreters. It should be emphasized that the program is continually changing as new ideas and applications arise. For example, in order to create a modeling system which is complete in some sense, PICASSO was designed explicitly to interface with the CDC analysis program MIMIC. The next step, already under investigation, is to allow for user-defined output templates to specify,the form of the output of a model. This feature, along with the capability for multiple definitions of an element, will allow for several types of analysis to be done on a single model. Another innovation being studied is the provision for ''robot'' commands, with which the user may define a sequence of. commands to be carried out on demand, in much the same way as mechanical ''robots'' are programmed. For this reason there will usually be several versions of PICASSO available, one of which is relatively ''bug-free''. The authors wish to gratefully acknowledge support from the Math and. Computing Division and the Electrical Engineering Department of the Lawrence Berkeley Laboratory, and the Department of Electrical Engineering and Computer Science of the University of California, Berkeley. Specifically, we wish to thank Ivan Wood and Horace Warnock of EE Drafting for support and many suggestions; Michiyuki Nakamura, Richard LaPierre, John Mendes, Don Evans and Frank Neu of EE Research and Development for many suggestions and interesting applications; Professor Baskin, EECS Department, UCB, James Baker and Carl Quong, Math and Computing, LBL for support and encouragement; and Norma Hart for preparing the manuscript.

Austin, D.M.; Holmes, H.H.

1972-01-01T23:59:59.000Z

359

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

360

Ocean Heat Uptake in Eddying and Non-Eddying Ocean Circulation Models in a Warming Climate  

Science Conference Proceedings (OSTI)

Ocean heat uptake is explored with non-eddying (2°), eddy-permitting (0.25°), and eddy-resolving (0.125°) ocean circulation models in a domain representing the Atlantic basin connected to a southern circumpolar channel with a flat bottom. The ...

Yu Zhang; Geoffrey K. Vallis

2013-10-01T23:59:59.000Z

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

A Computation of the Stratospheric Diabatic Circulation Using an Accurate Radiative Transfer Model  

Science Conference Proceedings (OSTI)

The global diabatic circulation is computed for the months of January, April, July and October over the altitude region 100 to 0.1 mb using an accurate troposphere-stratosphere radiative transfer model, SBUV and SME ozone data, and NMC ...

Joan E. Rosenfield; Mark R. Schoeberl; Marvin A. Geller

1987-03-01T23:59:59.000Z

362

A Three-Dimensional Model of Density-Driven Circulation in the Irish Sea  

Science Conference Proceedings (OSTI)

A semi-implicit version of the Princeton Ocean Model, ECOMsi, was used to simulate the cyclonic gyre that is found in the western Irish Sea during the spring and the summer. Mesoscale, seasonal, density-driven circulations such as this are an ...

Kevin J. Horsburgh; A. Edward Hill

2003-02-01T23:59:59.000Z

363

Frequency-domain multi-model analysis of the response of Atlantic meridional overturning circulation to surface forcing  

Science Conference Proceedings (OSTI)

The dynamics of the Atlantic Meridional Overturning Circulation (AMOC) vary considerably between different climate models; for example, some models show clear peaks in their power spectra, while others do not. In order to elucidate these model ...

Douglas G. MacMartin; Eli Tziperman; Laure Zanna

364

February 2002 Modelling The Conveyor Belt Circulation using MICOM  

E-Print Network (OSTI)

thknss. consistent with cooling #12;Large heat loss in Antarctic winter ameliorated (Too much?) #12;Grid Project · Oceans transport about half the heat from Tropics to Polar Regions · Wind Driven ocean/Xie-Arkin: Precipitation · Model SST + Bulk Forcing (Large et al.) Surface Flux of Heat and Freshwater #12;· NO RESTORING

Nadiga, Balasubramanya T. "Balu"

365

Momentum Fluxes in the Bryan–Cox Ocean Circulation Model  

Science Conference Proceedings (OSTI)

The velocities used by the original, standard version of the Bryan–Cox model to advect momentum are shown to be inconsistent with the main velocities over steps in the bathymetry. In particular, the vertical shears of the two sets of horizontal ...

M. J. Bell

1998-12-01T23:59:59.000Z

366

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

367

PICASSO: A GENERAL INTERACTIVE GRAPHICS MODELING PROGRAM.  

SciTech Connect

This report is intended to serve as a user's manual for PICASSO. The detailed description of the concepts involved and the methods used in implementing those concepts will be treated in a subsequent paper and are incorporated in the Ph.D. thesis of one of the authors. The program evolved from earlier work on a graphics program for printed circuit board design which had a fixed library of elements. The need for a dynamic graphics program (i.e., one which allows the creation of new elements as required) soon became obvious, and the generality of such a program for mathematical modeling was a major factor in the development of PICASSO. It was thought that the present stage of development of this modeling program had reached a point that a report such as this would be useful in creating a broader interest in the field. However, work continues to further generalize the program into such areas as computer animation, 3-D display and modeling, and a more general interface to available ''analysis'' routines, such as the available compilers and interpreters. It should be emphasized that the program is continually changing as new ideas and applications arise. For example, in order to create a modeling system which is complete in some sense, PICASSO was designed explicitly to interface with the CDC analysis program MIMIC. The next step, already under investigation, is to allow for user-defined output templates to specify,the form of the output of a model. This feature, along with the capability for multiple definitions of an element, will allow for several types of analysis to be done on a single model. Another innovation being studied is the provision for ''robot'' commands, with which the user may define a sequence of. commands to be carried out on demand, in much the same way as mechanical ''robots'' are programmed. For this reason there will usually be several versions of PICASSO available, one of which is relatively ''bug-free''. The authors wish to gratefully acknowledge support from the Math and. Computing Division and the Electrical Engineering Department of the Lawrence Berkeley Laboratory, and the Department of Electrical Engineering and Computer Science of the University of California, Berkeley. Specifically, we wish to thank Ivan Wood and Horace Warnock of EE Drafting for support and many suggestions; Michiyuki Nakamura, Richard LaPierre, John Mendes, Don Evans and Frank Neu of EE Research and Development for many suggestions and interesting applications; Professor Baskin, EECS Department, UCB, James Baker and Carl Quong, Math and Computing, LBL for support and encouragement; and Norma Hart for preparing the manuscript.

Austin, D.M.; Holmes, H.H.

1972-01-01T23:59:59.000Z

368

NEW MODEL FOR NUCLEON GENERALIZED PARTON DISTRIBUTIONS  

SciTech Connect

We describe a new type of models for nucleon generalized parton distributions (GPDs) H and E. They are heavily based on the fact nucleon GPDs require to use two forms of double distribution (DD) representations. The outcome of the new treatment is that the usual "DD+D-term" construction should be amended by an extra term, \\xi E_+^1 (x,\\xi) which has the DD structure \\alpha/\\beta e(\\beta,\\alpha), with e(\\beta,\\alpha) being the DD that generates GPD E(x,\\xi). We found that this function, unlike the D-term, has support in the whole -1 < x <1 region. Furthermore, it does not vanish at the border points |x|=\\xi.

Radyushkin, Anatoly V. [JLAB

2014-01-01T23:59:59.000Z

369

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

370

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

371

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

372

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

373

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

374

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

375

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

376

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

377

Model Studies of the Wind-Driven Transient Circulation in the Middle Atlantic Bight. Part 1: Adiabatic Boundary Conditions  

Science Conference Proceedings (OSTI)

A numerical model of the wind-driven transient ocean circulation in the Middle Atlantic Bight is described. The model incorporates realistic topography and covers the continental shelf between the coast and the 200 m isobath from Cape Hatteras to ...

Robert C. Beardsley; Dale B. Haidvogel

1981-03-01T23:59:59.000Z

378

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

379

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

380

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

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

Computable General Equilibrium Models for Sustainability Impact Assessment:  

Open Energy Info (EERE)

Computable General Equilibrium Models for Sustainability Impact Assessment: Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Agency/Company /Organization: DG Joint Research Centre, European Commission, University of Heidelberg Topics: Co-benefits assessment Resource Type: Guide/manual, Publications, Software/modeling tools User Interface: Other Website: iatools.jrc.ec.europa.eu/docs/ecol_econ_2006.pdf Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Screenshot References: Computable general equilibrium models[1] Abstract "Sustainability Impact Assessment (SIA) of economic, environmental, and

382

MODELING STRATEGIES TO COMPUTE NATURAL CIRCULATION USING CFD IN A VHTR AFTER A LOFA  

Science Conference Proceedings (OSTI)

A prismatic gas-cooled very high temperature reactor (VHTR) is being developed under the next generation nuclear plant program (NGNP) of the U.S. Department of Energy, Office of Nuclear Energy. In the design of the prismatic VHTR, hexagonal shaped graphite blocks are drilled to allow insertion of fuel pins, made of compacted TRISO fuel particles, and coolant channels for the helium coolant. One of the concerns for the reactor design is the effects of a loss of flow accident (LOFA) where the coolant circulators are lost for some reason, causing a loss of forced coolant flow through the core. In such an event, it is desired to know what happens to the (reduced) heat still being generated in the core and if it represents a problem for the fuel compacts, the graphite core or the reactor vessel (RV) walls. One of the mechanisms for the transport of heat out of the core is by the natural circulation of the coolant, which is still present. That is, how much heat may be transported by natural circulation through the core and upwards to the top of the upper plenum? It is beyond current capability for a computational fluid dynamic (CFD) analysis to perform a calculation on the whole RV with a sufficiently refined mesh to examine the full potential of natural circulation in the vessel. The present paper reports the investigation of several strategies to model the flow and heat transfer in the RV. It is found that it is necessary to employ representative geometries of the core to estimate the heat transfer. However, by taking advantage of global and local symmetries, a detailed estimate of the strength of the resulting natural circulation and the level of heat transfer to the top of the upper plenum is obtained.

Yu-Hsin Tung; Richard W. Johnson; Ching-Chang Chieng; Yuh-Ming Ferng

2012-11-01T23:59:59.000Z

383

Model generalization and its implications on intrusion detection  

Science Conference Proceedings (OSTI)

To make up for the incompleteness of the known behaviors of a computing resource, model generalization is utilized to infer more behaviors in the behavior model besides the known behaviors. In principle, model generalization can improve the detection ... Keywords: generalization, intrusion, intrusion detection, machine learning, security, security infrastructure

Zhuowei Li; Amitabha Das; Jianying Zhou

2005-06-01T23:59:59.000Z

384

Study of natural circulation in a VHTR after a LOFA using different turbulence models  

Science Conference Proceedings (OSTI)

Natural convection currents in the core are anticipated in the event of the failure of the gas circulator in a prismatic gas-cooled very high temperature reactor (VHTR). The paths that the helium coolant takes in forming natural circulation loops and the effective heat transport are of interest. The heated flow in the reactor core is turbulent during normal operating conditions and at the beginning of the LOFA with forced convection, but the flow may significantly be slowed down after the event and laminarized with mixed convection. In the present study, the potential occurrence and effective heat transport of natural circulation are demonstrated using computational fluid dynamic (CFD) calculations with different turbulence models as well as laminar flow. Validations and recommendation on turbulence model selection are conducted. The study concludes that large loop natural convection is formed due to the enhanced turbulence levels by the buoyancy effect and the turbulent regime near the interface of upper plenum and flow channels increases the flow resistance for channel flows entering upper plenum and thus less heat can be removed from the core than the prediction by laminar flow assumption.

Yu-Hsin Tung; Yuh-Ming Ferng; Richard W. Johnson; Ching-Chang Chieng

2013-10-01T23:59:59.000Z

385

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

386

Coastal Atmospheric Circulation around an Idealized Cape during Wind-Driven Upwelling Studied from a Coupled Ocean–Atmosphere Model  

Science Conference Proceedings (OSTI)

The study analyzes atmospheric circulation around an idealized coastal cape during summertime upwelling-favorable wind conditions simulated by a mesoscale coupled ocean–atmosphere model. The domain resembles an eastern ocean boundary with a ...

Natalie Perlin; Eric D. Skyllingstad; Roger M. Samelson

2011-03-01T23:59:59.000Z

387

Trends in Southern Hemisphere Circulation in IPCC AR4 Models over 1950–99: Ozone Depletion versus Greenhouse Forcing  

Science Conference Proceedings (OSTI)

Simulations by the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) models on the Southern Hemisphere (SH) circulation are assessed over the period 1950–99, focusing on the seasonality of the trend and the level of ...

Wenju Cai; Tim Cowan

2007-02-01T23:59:59.000Z

388

Mechanisms Determining the Atlantic Thermohaline Circulation Response to Greenhouse Gas Forcing in a Non-Flux-Adjusted Coupled Climate Model  

Science Conference Proceedings (OSTI)

Models of the North Atlantic thermohaline circulation (THC) show a range of responses to the high-latitude warming and freshening characteristic of global warming scenarios. Most simulate a weakening of the THC, with some suggesting possible ...

R. B. Thorpe; J. M. Gregory; T. C. Johns; R. A. Wood; J. F. B. Mitchell

2001-07-01T23:59:59.000Z

389

The North Atlantic Circulation in the Early 1980s-An Estimate from Inversion of a Finite-Difference Model  

Science Conference Proceedings (OSTI)

A finite-difference model of the North Atlantic is constructed for the purpose Of making an estimate of the circulation through an inverse calculation. The database is eclectic, and includes hydrography, oxygen, nutrients current meter and float ...

Françoise Martel; Carl Wunsch

1993-05-01T23:59:59.000Z

390

A Model of the Near-Surface Circulation of the Santa Barbara Channel: Comparison with Observations and Dynamical Interpretations  

Science Conference Proceedings (OSTI)

Previous studies indicate the importance of wind, wind curl, and density differences in driving the near-surface circulation in the Santa Barbara Channel (SBC). Here model sensitivity experiments and dynamical analyses of the near-surface ...

Lie-Yauw Oey; Clinton Winant; Ed Dever; Walter R. Johnson; Dong-Ping Wang

2004-01-01T23:59:59.000Z

391

The Moisture Mode in the Quasi-Equilibrium Tropical Circulation Model. Part II: Nonlinear Behavior on an Equatorial ? Plane  

Science Conference Proceedings (OSTI)

Numerical calculations of a simplified quasi-equilibrium tropical circulation model (QTCM) on the equatorial ? plane have been performed to explore the nonlinear regime of the moisture mode. Sensitivity tests have examined the effects of ...

Masahiro Sugiyama

2009-06-01T23:59:59.000Z

392

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

393

General model of quantum key distribution  

E-Print Network (OSTI)

A general mathematical framework for quantum key distribution based on the concepts of quantum channel and Turing machine is suggested. The security for its special case is proved. The assumption is that the adversary can perform only individual (in essence, classical) attacks. For this case an advantage of quantum key distribution over classical one is shown.

A. S. Trushechkin; I. V. Volovich

2005-04-20T23:59:59.000Z

394

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network (OSTI)

decomposition fronts in wood,” Combustion and Flame 139: 16–dynamics modeling of wood combustion,” Fire Safety Journalduring the pyrolysis of wood,” Combustion and Flame 17: 79–

Lautenberger, Chris

2007-01-01T23:59:59.000Z

395

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network (OSTI)

surface heat losses, heat conduction to the interior of the2.3.1 Solid phase heat conduction Thermophysical propertiesequation similar to the heat conduction equation. The model

Lautenberger, Chris

2007-01-01T23:59:59.000Z

396

The Role of Circulation Features on Black Carbon Transport into the Arctic in the Community Atmosphere Model Version 5 (CAM5)  

SciTech Connect

Current climate models generally under-predict the surface concentration of black carbon (BC) in the Arctic due to the uncertainties associated with emissions, transport, and removal. This bias is also present in the Community Atmosphere Model Version 5.1 (CAM5). In this study, we investigate the uncertainty of Arctic BC due to transport processes simulated by CAM5 by configuring the model to run in an “offline mode” in which the large-scale circulations are prescribed. We compare the simulated BC transport when the offline model is driven by the meteorology predicted by the standard free-running CAM5 with simulations where the meteorology is constrained to agree with reanalysis products. Some circulation biases are apparent: the free-running CAM5 produces about 50% less transient eddy transport of BC than the reanalysis-driven simulations, which may be attributed to the coarse model resolution insufficient to represent eddies. Our analysis shows that the free-running CAM5 reasonably captures the essence of the Arctic Oscillation (AO), but some discernable differences in the spatial pattern of the AO between the free-running CAM5 and the reanalysis-driven simulations result in significantly different AO modulation of BC transport over Northeast Asia and Eastern Europe. Nevertheless, we find that the overall climatological circulation patterns simulated by the free-running CAM5 generally resembles those from the reanalysis products, and BC transport is very similar in both simulation sets. Therefore, the simulated circulation features regulating the long-range BC transport is unlikely the most important cause of the large under-prediction of surface BC concentration in the Arctic.

Ma, Po-Lun; Rasch, Philip J.; Wang, Hailong; Zhang, Kai; Easter, Richard C.; Tilmes, S.; Fast, Jerome D.; Liu, Xiaohong; Yoon, Jin-Ho; Lamarque, Jean-Francois

2013-05-28T23:59:59.000Z

397

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

398

A Transient Model of Induced Natural Circulation Thermal Cycling for Hydrogen Isotope Separation  

SciTech Connect

The property of selective temperature dependence of adsorption and desorption of hydrogen isotopes by palladium is used for isotope separation. A proposal to use natural circulation of nitrogen to alternately heat and cool a packed bed of palladium coated beads is under active investigation, and a device consisting of two interlocking natural convection loops is being designed. A transient numerical model of the device has been developed to aid the design process. It is a one-dimensional finite-difference model, using the Boussinesq approximation. The thermal inertia of the pipe walls and other heat structures as well as the heater control logic is included in the model. Two system configurations were modeled and results are compared.

SHADDAY, MARTIN

2005-07-12T23:59:59.000Z

399

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

400

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

Note: This page contains sample records for the topic "general circulation model" 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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401

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

402

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

403

General model of oil shale pyrolysis  

DOE Green Energy (OSTI)

A mathematical model for pyrolysis of Green River oil shale is developed from previous experiments on oil, water, and gas evolution and oil cracking over a wide range of pyrolysis conditions. Reactions included are evolution of 5 gas species, oil, and water from kerogen, clay dehydration, oil coking and cracking, and evolution of H/sub 2/ and CH/sub 4/ from char. Oil is treated in eleven boiling-point fractions in order to treat the competition between oil coking and evaporation, and to evaluate the effect of oil cracking on the boiling point distribution of the oil. The kinetics and product yields calculated by the model are compared to experimental results for pyrolysis conditions ranging from isothermal fluid-bed to high-pressure slow-heating-rate retorting.

Burnham, A.K.; Braun, R.L.

1983-11-01T23:59:59.000Z

404

A single model of interacting dark energy: generalized phantom energy or generalized Chaplygin gas  

E-Print Network (OSTI)

I present a model in which dark energy interacts with matter. The former is represented by a variable equation of state. It is shown that the phantom crossing takes place at zero redshift, moreover, stable scaling solution of the Friedmann equations is obtained. I show that dark energy is most probably be either generalized phantom energy or the generalized Chaplygin gas.

Mubasher Jamil

2009-12-22T23:59:59.000Z

405

A Numerical Diagnostic Model of the Zonally Averaged Circulation in Isentropic Coordinates  

Science Conference Proceedings (OSTI)

In the linear theory of the isentropic zonally averaged circulation (Gallimore and Johnson, 1981), stable meridional circulations within the circumpolar vortex are forced by larger scale diabatic beating and angular momentum torques. The linear ...

Robert G. Gallimore; Donald R. Johnson

1981-09-01T23:59:59.000Z

406

ENV-Linkages General Equilibrium Model | Open Energy Information  

Open Energy Info (EERE)

ENV-Linkages General Equilibrium Model ENV-Linkages General Equilibrium Model Jump to: navigation, search Tool Summary Name: ENV-Linkages General Equilibrium Model Agency/Company /Organization: Organisation for Economic Co-Operation and Development Topics: Co-benefits assessment Resource Type: Software/modeling tools Website: www.oecd.org/officialdocuments/displaydocumentpdf/?cote=ECO/WKP(2008)6 References: OECD[1] Summary "The OECD ENV-Linkages General Equilibrium (GE) model is the successor to the OECD GREEN model for environmental studies, which was initially developed by the OECD Economics Department (Burniaux, et al. 1992) and is now hosted at the OECD Environment Directorate. GREEN was originally used for studying climate change mitigation policy and culminated in Burniaux (2000). It was developed into the Linkages model, and subsequently became

407

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

408

Model for Energy Supply System Alternatives and their General Environmental  

Open Energy Info (EERE)

Model for Energy Supply System Alternatives and their General Environmental Model for Energy Supply System Alternatives and their General Environmental Impacts (MESSAGE) (Redirected from Model for Energy Supply System Alternatives and their General Environmental Impacts) Jump to: navigation, search Tool Summary Name: Model for Energy Supply System Alternatives and their General Environmental Impacts Agency/Company /Organization: International Atomic Energy Agency Sector: Energy Focus Area: Renewable Energy, Energy Efficiency Topics: Pathways analysis Resource Type: Software/modeling tools Website: www-tc.iaea.org/tcweb/abouttc/strategy/Thematic/pdf/presentations/ener References: Overview of IAEA PESS Models [1] "MESSAGE combines technologies and fuels to construct so-called "energy chains", making it possible to map energy flows from supply (resource

409

A Zonally Averaged Ocean Model for the Thermohaline Circulation. Part II: Interocean Circulation in the Pacific-Atlantic Basin System  

Science Conference Proceedings (OSTI)

The zonally averaged, latitude-depth ocean model, developed in Part I, is extended to a two-basin system representing the Atlantic and Pacific. Steady states are calculated under two different surface boundary conditions to study a possible ...

Thomas F. Stocker; Daniel G. Wright

1991-12-01T23:59:59.000Z

410

Simulation of the Stable Water Isotopes in Precipitation over South America: Comparing Regional to Global Circulation Models  

Science Conference Proceedings (OSTI)

A simulation of the stable water isotope cycle over South America by the regional circulation model REMOiso is discussed. The performance of the regional model, with a resolution of 0.5° (55 km), is compared to simulations by the global ...

Christophe Sturm; Georg Hoffmann; Bärbel Langmann

2007-08-01T23:59:59.000Z

411

Modeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern Baffin Bay  

Science Conference Proceedings (OSTI)

A high-resolution sea ice–ocean numerical model of the North Water polynya has been developed to study the wind-driven circulation during polynya events. An idealized three-layer stratified ocean is used to initialize the model to characterize ...

Dany Dumont; Yves Gratton; Todd E. Arbetter

2010-06-01T23:59:59.000Z

412

General Equilibrium Modeling Package (GEMPACK) | Open Energy Information  

Open Energy Info (EERE)

General Equilibrium Modeling Package (GEMPACK) General Equilibrium Modeling Package (GEMPACK) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: General Equilibrium Modeling Package (GEMPACK) Agency/Company /Organization: Centre of Policy Studies, Monash University Sector: Climate Topics: Analysis Tools Complexity/Ease of Use: Advanced Website: www.monash.edu.au/policy/gempack.htm Cost: Paid Related Tools Ex Ante Appraisal Carbon-Balance Tool (EX-ACT) MIT Emissions Prediction and Policy Analysis (EPPA) Model Energy Forecasting Framework and Emissions Consensus Tool (EFFECT) ... further results A system for computable general equilibrium economic modeling, produced and

413

General Equilibrium Emissions Model (GEEM) | Open Energy Information  

Open Energy Info (EERE)

General Equilibrium Emissions Model (GEEM) General Equilibrium Emissions Model (GEEM) Jump to: navigation, search Tool Summary Name: General Equilibrium Emissions Model (GEEM) Agency/Company /Organization: International Institute for Sustainable Development (IISD) Sector: Climate, Energy Focus Area: Renewable Energy, Non-renewable Energy, Agriculture, Buildings, Economic Development, Energy Efficiency, Forestry, Goods and Materials, Greenhouse Gas, Industry, Offsets and Certificates, Transportation Topics: Background analysis, Baseline projection, GHG inventory, Low emission development planning, Market analysis, Pathways analysis, Policies/deployment programs, Technology characterizations Country: Kenya, Thailand UN Region: Eastern Africa, Caribbean Coordinates: 13.7240216°, 100.5798602°

414

Model for Energy Supply System Alternatives and their General Environmental  

Open Energy Info (EERE)

Model for Energy Supply System Alternatives and their General Environmental Model for Energy Supply System Alternatives and their General Environmental Impacts (MESSAGE) Jump to: navigation, search Tool Summary Name: Model for Energy Supply System Alternatives and their General Environmental Impacts Agency/Company /Organization: International Atomic Energy Agency Sector: Energy Focus Area: Renewable Energy, Energy Efficiency Topics: Pathways analysis Resource Type: Software/modeling tools Website: www-tc.iaea.org/tcweb/abouttc/strategy/Thematic/pdf/presentations/ener References: Overview of IAEA PESS Models [1] "MESSAGE combines technologies and fuels to construct so-called "energy chains", making it possible to map energy flows from supply (resource extraction) to demand (energy services). The model can help design long

415

Generalized Exponential Markov and Model Output Statistics: A Comparative Verification  

Science Conference Proceedings (OSTI)

We performed a comparative verification of Model Output Statistics (MOS) against Generalized Exponential Markov (GEM), a single station forecasting technique which uses only the surface observation and climatology as input. The verification was ...

Thomas J. Perrone; Robert G. Miller

1985-09-01T23:59:59.000Z

416

Laboratory Simulation of Mechanical Effects of Mountains on the General Circulation of the Northern Hemisphere: Uniform Shear Background Flow  

Science Conference Proceedings (OSTI)

The dimensionless governing equations and boundary conditions for the atmosphere are compared with those for a linearly stratified rotating dishpan laboratory experiment; by doing so a set of similarity criteria are determined. Model experiments ...

Don L. Boyer; Rui-Rong Chen

1987-12-01T23:59:59.000Z

417

What is Driving Changes in the Tropospheric Circulation? New Insights from Simplified Models.  

E-Print Network (OSTI)

??This thesis seeks an improved understanding of what has been driving changes in the large scale tropospheric circulation. First, we consider the effects of stratospheric… (more)

Tandon, Neil Francis

2013-01-01T23:59:59.000Z

418

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

419

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

420

Quasi-steady model for predicting temperature of aqueous foams circulating in geothermal wellbores  

DOE Green Energy (OSTI)

A quasi-steady model has been developed for predicting the temperature profiles of aqueous foams circulating in geothermal wellbores. The model assumes steady one-dimensional incompressible flow in the wellbore; heat transfer by conduction from the geologic formation to the foam is one-dimensional radially and time-dependent. The vertical temperature distribution in the undisturbed geologic formation is assumed to be composed of two linear segments. For constant values of the convective heat-transfer coefficient, a closed-form analytical solution is obtained. It is demonstrated that the Prandtl number of aqueous foams is large (1000 to 5000); hence, a fully developed temperature profile may not exist for representative drilling applications. Existing convective heat-transfer-coefficient solutions are adapted to aqueous foams. The simplified quasi-steady model is successfully compared with a more-sophisticated finite-difference computer code. Sample temperature-profile calculations are presented for representative values of the primary parameters. For a 5000-ft wellbore with a bottom hole temperature of 375{sup 0}F, the maximum foam temperature can be as high as 300{sup 0}F.

Blackwell, B.F.; Ortega, A.

1983-01-01T23:59:59.000Z

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


421

Numerical Modeling of Reactive Multiphase Flow for FCC and Hot Gas Desulfurization Circulating Fluidized Beds  

Science Conference Proceedings (OSTI)

This work was carried out to understand the behavior of the solid and gas phases in a CFB riser. Only the riser is modeled as a straight pipe. A model with linear algebraic approximation to solids viscosity of the form, {musubs} = 5.34{epsisubs}, ({espisubs} is the solids volume fraction) with an appropriate boundary condition at the wall obtained by approximate momentum balance solution at the wall to acount for the solids recirculation is tested against experimental results. The work done was to predict the flow patterns in the CFB risers from available experimental data, including data from a 7.5-cm-ID CFB riser at the Illinois Institute of Technology and data from a 20.0-cm-ID CFB riser at the Particulate Solid Research, Inc., facility. This research aims at modeling the removal of hydrogen sulfide from hot coal gas using zinc oxide as the sorbent in a circulating fluidized bed and in the process indentifying the parameters that affect the performance of the sulfidation reactor. Two different gas-solid reaction models, the unreacted shrinking core (USC) and the grain model were applied to take into account chemical reaction resistances. Also two different approaches were used to affect the hydrodynamics of the process streams. The first model takes into account the effect of micro-scale particle clustering by adjusting the gas-particle drag law and the second one assumes a turbulent core with pseudo-steady state boundary condition at the wall. A comparison is made with experimental results.

None

2005-07-01T23:59:59.000Z

422

A Quasi-geostrophic Circulation Model of the Northeast Pacific. Part II: Effects of Topography and Seasonal Forcing  

Science Conference Proceedings (OSTI)

A quasi-geostrophic regional model of the northeast Pacific is used to investigate the effects of bottom topography and seasonal wind forcing on the circulation of the Alaskan Gyre. In a numerical experiment with a flat bottom and steady forcing ...

Patrick F. Cummins

1989-11-01T23:59:59.000Z

423

An Inverse Model for Seasonal Circulation over the Southern Brazilian Shelf: Near-Surface Velocity from the Heat Budget  

Science Conference Proceedings (OSTI)

An inverse model was developed of the seasonal upper-layer circulation in the region adjacent to the coast of southern Brazil between 30° and 35°S, 50° and 55°W near the boundary of the Brazil–Malvinas confluence. In this region there are no in ...

Peter O. Zavialov; Renato D. Ghisolfi; Carlos A. E. Garcia

1998-04-01T23:59:59.000Z

424

The Strength of the Brewer–Dobson Circulation in a Changing Climate: Coupled Chemistry–Climate Model Simulations  

Science Conference Proceedings (OSTI)

The strength of the Brewer–Dobson circulation (BDC) in a changing climate is studied using multidecadal simulations covering the 1960–2100 period with a coupled chemistry–climate model, to examine the seasonality of the change of the BDC. The ...

Feng Li; John Austin; John Wilson

2008-01-01T23:59:59.000Z

425

Global Circulation in an Axially Symmetric Shallow-Water Model, Forced by Off-Equatorial Differential Heating  

Science Conference Proceedings (OSTI)

An axially symmetric inviscid shallow-water model (SWM) on the rotating Earth forced by off-equatorial steady differential heating is employed to characterize the main features of the upper branch of an ideal Hadley circulation. The steady-state ...

Ori Adam; Nathan Paldor

2010-04-01T23:59:59.000Z

426

Estimating Eddy Stresses by Fitting Dynamics to Observations Using a Residual-Mean Ocean Circulation Model and Its Adjoint  

Science Conference Proceedings (OSTI)

A global ocean circulation model is formulated in terms of the “residual mean” and used to study eddy–mean flow interaction. Adjoint techniques are used to compute the three-dimensional eddy stress field that minimizes the departure of the coarse-...

David Ferreira; John Marshall; Patrick Heimbach

2005-10-01T23:59:59.000Z

427

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

428

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

429

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

430

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

431

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

432

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

433

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

434

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

435

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

436

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

437

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

E-Print Network (OSTI)

while the two others (CAM-PNNL and CAM-Umich) indicate ain T42L26 resolution. CAM-PNNL: The simulations were doneCAM- NCAR CAM- Oslo CAM- PNNL CAM- Umich ECHAM5 GFDL GISS

Quaas, Johannes

2010-01-01T23:59:59.000Z

438

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

E-Print Network (OSTI)

while the two others (CAM-PNNL and CAM-Umich) indicate ain T42L26 resolution. CAM-PNNL: The simulations were doneCAM- NCAR CAM- Oslo CAM- PNNL CAM- Umich ECHAM5 GFDL GISS

Quaas, Johannes

2010-01-01T23:59:59.000Z

439

A Variable-Resolution Stretched-Grid General Circulation Model: Regional Climate Simulation  

Science Conference Proceedings (OSTI)

The development of and results obtained with a variable-resolution stretched-grid GCM for the regional climate simulation mode are presented. A global variable-resolution stretched grid used in the study has enhanced horizontal resolution over ...

Michael S. Fox-Rabinovitz; Lawrence L. Takacs; Ravi C. Govindaraju; Max J. Suarez

2001-03-01T23:59:59.000Z

440

A Step-Mountain Coordinate General Circulation Model: Description and Validation of Medium-Range Forecasts  

Science Conference Proceedings (OSTI)

The step-mountain or eta vertical coordinate has been a proposed solution for eliminating the numerical errors encountered when calculating the pressure gradient force along sloping surfaces. The main objectives of this paper are to describe the ...

B. L. Wyman

1996-01-01T23:59:59.000Z

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

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

442

The Effects of Cumulus Moisture Transports on the Simulation of Climate with a General Circulation Model  

Science Conference Proceedings (OSTI)

A hybrid cumulus parameterization was developed to study the effects of cumulus heat and moisture transports on climate simulations. This parameterization consists of a cumulus mass flux representation of the convective fluxes of heat and ...

Bruce A. Albrecht; V. Ramanathan; Byron A. Boville

1986-11-01T23:59:59.000Z

443

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

E-Print Network (OSTI)

J. : A parameterization of aerosol activation - 3. Sectionalclouds on indirect aerosol climate forcing, Nature, 432,2004. Albrecht, B. A. : Aerosols, cloud microphysics, and

Quaas, Johannes

2010-01-01T23:59:59.000Z

444

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

E-Print Network (OSTI)

Oscillation influence aerosol variability? , J. Geophys.clouds on indirect aerosol climate forcing, Nature, 432,2004. Albrecht, B. A. : Aerosols, cloud microphysics, and

Quaas, Johannes

2010-01-01T23:59:59.000Z

445

Interactions among Radiation, Convection, and Large-Scale Dynamics in a General Circulation Model  

Science Conference Proceedings (OSTI)

We have analyzed the effects of radiatively active clouds on the climate simulated by the UCLA/GLA GCM, with particular attention to the effects of the upper tropospheric stratiform clouds associated with deep cumulus convection, and the ...

David A. Randall; Harshvardhan; Donald A. Dazlich; Thomas G. Corsetti

1989-07-01T23:59:59.000Z

446

Environmental Impact and Sustainability Applied General Equilibrium Model  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Environmental Impact and Sustainability Applied General Equilibrium Model (ENVISAGE) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: Environmental Impact and Sustainability Applied General Equilibrium Model (ENVISAGE) Agency/Company /Organization: World Bank Sector: Climate Topics: Analysis Tools Complexity/Ease of Use: Advanced Website: go.worldbank.org/ZC77UJYJ50 Related Tools TransportToolkit Prototype Threshold 21 Model General Equilibrium Modeling Package (GEMPACK) ... further results Designed to analyze a variety of issues related to the economics of climate

447

Comparative Evaluation of Generalized River/Reservoir System Models  

E-Print Network (OSTI)

This report reviews user-oriented generalized reservoir/river system models. The terms reservoir/river system, reservoir system, reservoir operation, or river basin management "model" or "modeling system" are used synonymously to refer to computer modeling systems that simulate the storage, flow, and diversion of water in a system of reservoirs and river reaches. Generalized means that a computer modeling system is designed for application to a range of concerns dealing with river basin systems of various configurations and locations, rather than being site-specific customized to a particular system. User-oriented implies the modeling system is designed for use by professional practitioners (model-users) other than the original model developers and is thoroughly tested and well documented. User-oriented generalized modeling systems should be convenient to obtain, understand, and use and should work correctly, completely, and efficiently. Modeling applications often involve a system of several simulation models, utility software products, and databases used in combination. A reservoir/river system model is itself a modeling system, which often serves as a component of a larger modeling system that may include watershed hydrology and river hydraulics models, water quality models, databases and various software tools for managing time series, spatial, and other types of data. Reservoir/river system models are based on volume-balance accounting procedures for tracking the movement of water through a system of reservoirs and river reaches. The model computes reservoir storage contents, evaporation, water supply withdrawals, hydroelectric energy generation, and river flows for specified system operating rules and input sequences of stream inflows and net evaporation rates. The hydrologic period-of-analysis and computational time step may vary greatly depending on the application. Storage and flow hydrograph ordinates for a flood event occurring over a few days may be determined at intervals of an hour or less. Water supply capabilities may be modeled with a monthly time step and several decade long period-of-analysis capturing the full range of fluctuating wet and dry periods including extended drought. Stream inflows are usually generated outside of the reservoir/river system model and provided as input to the model. However, reservoir/river system models may also include capabilities for modeling watershed precipitation-runoff processes to generate inflows to the river/reservoir system. Some reservoir/river system models simulate water quality constituents along with water quantities. Some models include features for economic evaluation of system performance based on cost and benefit functions expressed as a function of flow and storage.

Wurbs, Ralph A.

2005-04-01T23:59:59.000Z

448

Model study of generalized parton distributions with helicity flip  

E-Print Network (OSTI)

Generalized parton distributions with helicity flip are studied in the quark sector, within a simple version of the MIT bag model, assuming an SU(6) wave function for the proton target. In the framework under scrutiny it turns out that only the generalized transversity distribution, H_T^q, is non vanishing. For this quantity, the forward limit is properly recovered and numerical results are found to underestimate recent lattice data for its first moment. Positivity bounds recently proposed are fulfilled by the obtained distribution. The relevance of the analysis for the planning of measurements of the quark generalized transversity is addressed.

Sergio Scopetta

2005-09-26T23:59:59.000Z

449

Generalized holographic dark energy model described at the Hubble length  

E-Print Network (OSTI)

We generalize the holographic dark energy model described in Hubble length IR cutoff by assuming a slowly time varying function for holographic parameter $c^2$. We calculate the evolution of EoS parameter and the deceleration parameter as well as the evolution of dark energy density in this generalized model. We show that the phantom line is crossed from quintessence regime to phantom regime which is in agreement with observation. The evolution of deceleration parameter indicates the transition from decelerated to accelerated expansion. Eventually, we show that the GHDE with HIR cutoff can interpret the pressureless dark matter era at the early time and dark energy dominated phase later.

M. Malekjani

2012-09-25T23:59:59.000Z

450

The Leading, Interdecadal Eigenmode of the Atlantic Meridional Overturning Circulation in a Realistic Ocean Model  

Science Conference Proceedings (OSTI)

Variations in the strength of the Atlantic meridional overturning circulation (AMOC) are a major potential source of decadal and longer climate variability in the Atlantic. This study analyzes continuous integrations of tangent linear and adjoint ...

Florian Sévellec; Alexey V. Fedorov

2013-04-01T23:59:59.000Z

451

Diurnal Circulation of the Bolivian Altiplano. Part II: Theoretical and Model Investigations  

Science Conference Proceedings (OSTI)

The first step in the evolution of the diurnal circulation of grand plateaus is the matutinal buildup of inflow through mountain passes connecting the lowlands with the plateau proper. Maximum inward transport is attained in the afternoon. ...

Günther Zängl; Joseph Egger

2005-12-01T23:59:59.000Z

452

Observations and a Model of the Mean Circulation over the Middle Atlantic Bight Continental Shelf  

Science Conference Proceedings (OSTI)

Analyses of current time series longer than 200 days from 33 sites over the Middle Atlantic Bight continental shelf reveal a consistent mean circulation pattern. The mean depth-averaged flow is equatorward, alongshelf, and increases with ...

Steven J. Lentz

2008-06-01T23:59:59.000Z

453

Effects of Convective Momentum Transport on the Atmospheric Circulation in the Community Atmosphere Model, Version 3  

Science Conference Proceedings (OSTI)

Transport of momentum by convection is an important process affecting global circulation. Owing to the lack of global observations, the quantification of the impact of this process on the tropospheric climate is difficult. Here an implementation ...

Jadwiga H. Richter; Philip J. Rasch

2008-04-01T23:59:59.000Z

454

Atlantic Ocean circulation at the last glacial maximum : inferences from data and models  

E-Print Network (OSTI)

This thesis focuses on ocean circulation and atmospheric forcing in the Atlantic Ocean at the Last Glacial Maximum (LGM, 18-21 thousand years before present). Relative to the pre-industrial climate, LGM atmospheric CO? ...

Dail, Holly Janine

2012-01-01T23:59:59.000Z

455

A Simple Model of Nonlinear Hadley Circulation with an ITCZ: Analytic and Numerical Solutions  

Science Conference Proceedings (OSTI)

Simple analytic solutions are constructed for an axially symmetric, nonlinear, slightly viscous circulation in a Boussinesq atmosphere in the presence of intense convection at an intertropical convergence zone. The latitude–height extent of the ...

Ming Fang; Ka Kit Tung

1996-05-01T23:59:59.000Z

456

general  

Science Conference Proceedings (OSTI)

ANSYS Fluent software contains the broad physical modeling capabilities needed to model flow, turbulence, heat transfer, and reactions for a wide variety of ...

457

Generalized Teleparallel Gravity Via Some Scalar Field Dark Energy Models  

E-Print Network (OSTI)

We consider generalized teleparallel gravity in the flat FRW universe with a viable power-law f(T) model. We construct its equation of state and deceleration parameters which give accelerated expansion of the universe in quintessence era for the obtained scale factor. Further, we develop correspondence of f(T) model with scalar field models such as, quintessence, tachyon, K-essence and dilaton. The dynamics of scalar field as well as scalar potential of these models indicate the expansion of the universe with acceleration in the f(T) gravity scenario.

M. Sharif; Shamaila Rani

2013-11-25T23:59:59.000Z

458

Modeling Smart Grid using Generalized Stochastic Petri Net  

E-Print Network (OSTI)

Building smart grid for power system is a major challenge for safe, automated and energy efficient usage of electricity. The full implementation of the smart grid will evolve over time. However, before a new set of infrastructures are invested to build the smart grid, proper modeling and analysis is needed to avoid wastage of resources. Modeling also helps to identify and prioritize appropriate systems parameters. In this paper, an all comprehensive model of smart grid have been proposed using Generalized Stochastic Petri Nets (GSPN). The model is used to analyze the constraints and deliverables of the smart power grid of future.

Dey, Amrita; Sanyal, Sugata

2011-01-01T23:59:59.000Z

459

Generalized Inversion of Tropical Atmosphere–Ocean Data and a Coupled Model of the Tropical Pacific  

Science Conference Proceedings (OSTI)

It is hypothesized that the circulation of the tropical Pacific Ocean and atmosphere satisfies the equations of a simple coupled model to within errors having specified covariances, and that the Tropical Atmosphere–Ocean array (TAO) measures the ...

Andrew F. Bennett; Boon S. Chua; D. Ed Harrison; Michael J. McPhaden

1998-07-01T23:59:59.000Z

460

A mutation-selection model with recombination for general genotypes  

E-Print Network (OSTI)

A mutation-selection model with recombination for general genotypes Steven N. Evans David II: Polynomial selective costs 9 1.4. Example III: Demographic selective costs 10 1.5. Comments selective cost 23 3.3. Fr´echet derivatives 26 3.4. Existence of equilibria via perturbation 27 3.5. Concave

Evans, Steven N.

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

Improved estimators for a general class of beta regression models  

Science Conference Proceedings (OSTI)

In this article, we extend the beta regression model proposed by Ferrari and Cribari-Neto (2004), which is generally useful in situations where the response is restricted to the standard unit interval in two different ways: we let the regression structure ...

Alexandre B. Simas; Wagner Barreto-Souza; Andréa V. Rocha

2010-02-01T23:59:59.000Z

462

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

463

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

464

A Zonally Averaged Ocean Model for the Thermohaline Circulation. Part I: Model Development and Flow Dynamics  

Science Conference Proceedings (OSTI)

A two-dimensional latitude–depth ocean model is developed on the basis of the zonally averaged balance equations of mass, momentum, heat, and salt. Its purpose is to investigate the dynamics and variability of the buoyancy-forced thermohaline ...

Daniel G. Wright; Thomas F. Stocker

1991-12-01T23:59:59.000Z

465

System Advisor Model, SAM 2011.12.2: General Description  

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

System Advisor Model, System Advisor Model, SAM 2011.12.2: General Description Paul Gilman and Aron Dobos Technical Report NREL/TP-6A20-53437 February 2012 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 System Advisor Model, SAM 2011.12.2: General Description Paul Gilman and Aron Dobos Prepared under Task No. SS12.1130 Technical Report NREL/TP-6A20-53437 February 2012 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government.

466

Holographic Dark Energy Model with Modified Generalized Chaplygin Gas  

E-Print Network (OSTI)

We present a holographic dark energy model of the universe considering modified generalized Chaplygin gas (GCG). The modified GCG behaves as an ordinary barotropic fluid in the early epoch when the universe was tiny but behaves subsequently as a $\\Lambda$CDM model at late epoch. An equivalent model with scalar field is obtained here by constructing the corresponding potential. The holographic dark energy is identified with the modified GCG and we determine the corresponding holographic dark energy field and its potential. The stability of the holographic dark energy in this case is also discussed.

B. C. Paul; P. Thakur; A. Saha

2007-07-31T23:59:59.000Z

467

Low-Frequency Variability, Coherence Resonance, and Phase Selection in a Low-Order Model of the Wind-Driven Ocean Circulation  

Science Conference Proceedings (OSTI)

In this paper, a low-order spectral quasigeostrophic (QG) model of the wind-driven ocean circulation is derived and used to analyze the low-order character of the intrinsic low-frequency variability of the midlatitude double-gyre ocean circulation ...

Stefano Pierini

2011-09-01T23:59:59.000Z

468

Optimal reinsurance/investment problems for general insurance models  

E-Print Network (OSTI)

In this paper the utility optimization problem for a general insurance model is studied. The reserve process of the insurance company is described by a stochastic differential equation driven by a Brownian motion and a Poisson random measure, representing the randomness from the financial market and the insurance claims, respectively. The random safety loading and stochastic interest rates are allowed in the model so that the reserve process is non-Markovian in general. The insurance company can manage the reserves through both portfolios of the investment and a reinsurance policy to optimize a certain utility function, defined in a generic way. The main feature of the problem lies in the intrinsic constraint on the part of reinsurance policy, which is only proportional to the claim-size instead of the current level of reserve, and hence it is quite different from the optimal investment/consumption problem with constraints in finance. Necessary and sufficient conditions for both well posedness and solvability...

Liu, Yuping; 10.1214/08-AAP582

2009-01-01T23:59:59.000Z

469

Assimilation of Altimeter Data into an Ocean Circulation Model: Space versus Time Resolution Studies  

Science Conference Proceedings (OSTI)

One of the most important forthcoming synoptic datasets for ocean circulation studies will he the sea-surface height data provided by the TOPEX /POSEIDON satellite. The TOPEX/POSEIDON project is in the planning stage and must still decide upon ...

William R. Holland; Paola Malanotte-Rizzoli

1989-10-01T23:59:59.000Z

470

Adaptation of an Isopycnic Coordinate Ocean Model for the Study of Circulation beneath Ice Shelves  

Science Conference Proceedings (OSTI)

Much of the Antarctic coastline comprises large, floating ice shelves, beneath which waters from the open ocean circulate. The interaction of the seawater with the base of these ice shelves has a bearing both on the rate at which Antarctic Bottom ...

David M. Holland; Adrian Jenkins

2001-08-01T23:59:59.000Z

471

ANN Models for Steam Turbine Power Output Toward Condenser Circulating Water Flux  

Science Conference Proceedings (OSTI)

Aimed the costliness and the complex process of performance test for steam turbine power output toward circulating water flux and in view of the non—linear advantage about neural network, it brings forward predicting the performance using artificial ... Keywords: Artificial neural network, steam turbine power output, performance prediction

Jia Ruixuan; Xu Hong

2010-05-01T23:59:59.000Z

472

General properties of cosmological models with an Isotropic Singularity  

E-Print Network (OSTI)

Much of the published work regarding the Isotropic Singularity is performed under the assumption that the matter source for the cosmological model is a barotropic perfect fluid, or even a perfect fluid with a $\\gamma$-law equation of state. There are, however, some general properties of cosmological models which admit an Isotropic Singularity, irrespective of the matter source. In particular, we show that the Isotropic Singularity is a point-like singularity and that vacuum space-times cannot admit an Isotropic Singularity. The relationships between the Isotropic Singularity, and the energy conditions, and the Hubble parameter is explored. A review of work by the authors, regarding the Isotropic Singularity, is presented.

Geoffery Ericksson; Susan M. Scott

2003-02-25T23:59:59.000Z

473

Generalized Poland-Scheraga model for DNA hybridization  

E-Print Network (OSTI)

The Poland-Scheraga (PS) model for the helix-coil transition of DNA considers the statistical mechanics of the binding (or hybridization) of two complementary strands of DNA of equal length, with the restriction that only bases with the same index along the strands are allowed to bind. In this paper, we extend this model by relaxing these constraints: We propose a generalization of the PS model which allows for the binding of two strands of unequal lengths $N_{1}$ and $N_{2}$ with unrelated sequences. We study in particular (i) the effect of mismatches on the hybridization of complementary strands (ii) the hybridization of non complementary strands (as resulting from point mutations) of unequal lengths $N_{1}$ and $N_{2}$. The use of a Fixman-Freire scheme scales down the computational complexity of our algorithm from $O(N_{1}^{2}N_{2}^{2})$ to $O(N_{1}N_{2})$.The simulation of complementary strands of a few kbps yields results almost identical to the PS model. For short strands of equal or unequal lengths, the binding displays a strong sensitivity to mutations. This model may be relevant to the experimental protocol in DNA microarrays, and more generally to the molecular recognition of DNA fragments. It also provides a physical implementation of sequence alignments.

Thomas Garel; Henri Orland

2004-02-18T23:59:59.000Z

474

A dark energy model alternative to generalized Chaplygin gas  

E-Print Network (OSTI)

We propose a new fluid model of dark energy for $-1 \\leq \\omega_{\\text{eff}} \\leq 0$ as an alternative to the generalized Chaplygin gas models. The energy density of dark energy fluid is severely suppressed during barotropic matter dominant epochs, and it dominates the universe evolution only for eras of small redshift. From the perspective of fundamental physics, the fluid is a tachyon field with a scalar potential flatter than that of power-law decelerated expansion. Different from the standard $\\Lambda\\text{CDM}$ model, the suggested dark energy model claims that the cosmic acceleration at present epoch can not continue forever but will cease in the near future and a decelerated cosmic expansion will recover afterwards.

Hova, Hoavo

2010-01-01T23:59:59.000Z

475

General Coldness of Climate Models” and the Second Law: Implications for Modeling the Earth System  

Science Conference Proceedings (OSTI)

Motivated by the circumstantial evidence of the pervasive nature of the “general coldness” of climate model simulations, a theoretical analysis is made of the model response expected from the presence of both physical and aphysical sources of ...

Donald R. Johnson

1997-11-01T23:59:59.000Z

476

Investigating the Influence of Synoptic-Scale Monsoonal Winds and Mesoscale Circulations on Diurnal Weather Patterns over Kenya Using a Mesoscale Numerical Model  

Science Conference Proceedings (OSTI)

The Regional Atmospheric Modeling System (RAMS) developed at Colorado State University (CSU) was used to investigate the influence of the large-scale monsoonal winds and the mesoscale local circulations on the diurnal precipitation pattern over ...

Joseph R. Mukabana; Roger A. Piekle

1996-02-01T23:59:59.000Z

477

A multi-model study of sea surface temperature and sub-surface density fingerprints of the Atlantic meridional overturning circulation  

Science Conference Proceedings (OSTI)

The Atlantic meridional overturning circulation (AMOC) is an important component of the North Atlantic climate system. Here, we use simulations from ten coupled climate models to calculate patterns of sea surface temperature (SST) and sub-surface ...

Christopher D. Roberts; Freya K. Garry; Laura C. Jackson

478

Low-Frequency Variability in Shallow-Water Models of the Wind-Driven Ocean Circulation. Part I: Steady-State Solution  

Science Conference Proceedings (OSTI)

Successive bifurcations—from steady states through periodic to aperiodic solutions—are studied in a shallow-water, reduced-gravity, 2½-layer model of the midlatitude ocean circulation subject to time-independent wind stress. The bifurcation ...

Eric Simonnet; Michael Ghil; Kayo Ide; Roger Temam; Shouhong Wang

2003-04-01T23:59:59.000Z

479

The Moisture Mode in the Quasi-Equilibrium Tropical Circulation Model. Part I: Analysis Based on the Weak Temperature Gradient Approximation  

Science Conference Proceedings (OSTI)

The moisture mode in a simplified version of the quasi-equilibrium tropical circulation model (QTCM) of Neelin and Zeng is analyzed. Perturbation expansion based on the ratio of temperature tendency to adiabatic cooling simplifies the system and ...

Masahiro Sugiyama

2009-06-01T23:59:59.000Z

480

Effect of Atlantic Meridional Overturning Circulation Changes on Tropical Atlantic Sea Surface Temperature Variability: A 2½-Layer Reduced-Gravity Ocean Model Study  

Science Conference Proceedings (OSTI)

Previous coupled climate model simulations reveal that a dipole-like SST pattern with cooler (warmer) temperature over the north (south) tropical Atlantic emerges in response to a slowdown of the Atlantic meridional overturning circulation (AMOC)...

Caihong Wen; Ping Chang; Ramalingam Saravanan

2010-01-01T23:59:59.000Z

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


481

Stommel’s Box Model of Thermohaline Circulation Revisited—The Role of Mechanical Energy Supporting Mixing and the Wind-Driven Gyration  

Science Conference Proceedings (OSTI)

The classical two-box model of Stommel is extended in two directions: replacing the buoyancy constraint with an energy constraint and including the wind-driven gyre. Stommel postulated a buoyancy constraint for the thermohaline circulation, and ...

Yu Ping Guan; Rui Xin Huang

2008-04-01T23:59:59.000Z

482

Electromagnetic mass-models in general relativity reexamined  

E-Print Network (OSTI)

The problem of constructing a model of an extended charged particle within the context of general relativity has a long and distinguished history. The distinctive feature of these models is that, in some way or another, they require the presence of negative mass in order to maintain stability against Coulomb's repulsion. Typically, the particle contains a core of $negative$ mass surrounded by a positive-mass outer layer, which emerges from the Reissner-Nordstr\\"{o}m field. In this work we show how the Einstein-Maxwell field equations can be used to construct an extended model where the mass is positive everywhere. This requires the principal pressures to be unequal inside the particle. The model is obtained by setting the "effective" matter density, rather than the rest matter density, equal to zero. The Schwarzschild mass of the particle arises from the electrical and gravitational field (Weyl tensor) energy. The model satisfies the energy conditions of Hawking and Ellis. A particular solution that illustrates the results is presented.

J. Ponce de Leon

2003-10-28T23:59:59.000Z

483

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

484

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

485

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

486

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

487

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

488

Linear and Nonlinear Diagnostic Models of Stationary Eddies in the Upper Troposphere during Northern Summer  

Science Conference Proceedings (OSTI)

The upper tropospheric circulation during northern summer produced by a general circulation model (GCM) is studied using linear and nonlinear barotropic models and by analysing a streamfunction budget. The model experiments and the budget ...

In-Sik Kang; Isaac M. Held

1986-12-01T23:59:59.000Z

489

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

Science Conference Proceedings (OSTI)

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

Jinlun Zhang; D. A. Rothrock

2003-05-01T23:59:59.000Z

490

Nonhydrostatic icosahedral atmospheric model (NICAM) for global cloud resolving simulations  

Science Conference Proceedings (OSTI)

A new type of ultra-high resolution atmospheric global circulation model is developed. The new model is designed to perform ''cloud resolving simulations'' by directly calculating deep convection and meso-scale circulations, which play key roles not ... Keywords: Aqua-planet experiments, Atmospheric general circulation models, Cloud clusters, Cloud resolving model, Icosahedral grids, Nonhydrostatic model

M. Satoh; T. Matsuno; H. Tomita; H. Miura; T. Nasuno; S. Iga

2008-03-01T23:59:59.000Z

491

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

492

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

493

A Vertical Coordinate Mapping Technique for Semispectral Primitive Equation Models of Oceanic Circulation  

Science Conference Proceedings (OSTI)

A stretched coordinate technique for semispectral hydrodynamic models is described that allows for greater flexibility in the placement of model grid points. Stretching is implemented here for the vertical coordinate of an oceanic model that ...

Albert J. Hermann; Hsiao-Ming Hsu

1993-06-01T23:59:59.000Z

494

Objective Debiasing for Improved Forecasting of Tropical Cyclone Intensity with a Global Circulation Model  

Science Conference Proceedings (OSTI)

The damage potential of a tropical cyclone is proportional to a power (generally greater than one) of intensity, which demands high accuracy in forecasting intensity for managing this natural disaster. However, the current skill in forecasting ...

P. Goswami; S. Mallick; K. C. Gouda

2011-08-01T23:59:59.000Z

495

Low-Frequency Variability in Shallow-Water Models of the Wind-Driven Ocean Circulation. Part II: Time-Dependent Solutions  

Science Conference Proceedings (OSTI)

The time-dependent wind-driven ocean circulation is investigated for both a rectangular and a North Atlantic–shaped basin. Multiple steady states in a 2½-layer shallow-water model and their dependence on various parameters and other model ...

Eric Simonnet; Michael Ghil; Kayo Ide; Roger Temam; Shouhong Wang

2003-04-01T23:59:59.000Z

496

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

E-Print Network (OSTI)

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

497

An Intercomparison of a Bryan-Cox-Type Ocean Model and an Isopycnic Ocean Model. Part II: The Subtropical Gyre and Meridional Heat Transport  

Science Conference Proceedings (OSTI)

In a companion paper, two ocean general circulation models were implemented in order to simulate and intercompare the main features of the North Atlantic circulation: the Atlantic Isopycnic Model (AIM) and the Hadley Centre Bryan-Cox-type ocean ...

Robert Marsh; Adrian L. New; Malcolm J. Roberts; Richard A. Wood

1996-08-01T23:59:59.000Z

498

A Simulation of the Winter and Summer Circulations with the NMC Global Spectral Model  

Science Conference Proceedings (OSTI)

The medium range forecast model of the National Meteorological Center (NMC) has been integrated to produce winter and summer simulations. For the winter simulation, the model was initialized with the NMC analysis of 1200 UTC 15 December 1985 and ...

J. L. Kinter III; J. Shukla; L. Marx; E. K. Schneider

1988-09-01T23:59:59.000Z

499

A Model of the Equatorial Sea Surface Temperature Field and Associated Circulation Dynamics  

Science Conference Proceedings (OSTI)

A linear, continuously stratified analytical model of the equatorial ocean is developed and used to simulate the major features of the equatorial sea surface temperature (SST) field and current system. The model is bounded by meridional barriers ...

Lewis M. Rothstein

1984-12-01T23:59:59.000Z

500

A general kinetic model: Kinetics and atomic-scale mechanisms of feldspar dissolution.  

E-Print Network (OSTI)

??This thesis presents a general kinetic model and its application to feldspar dissolution. In the framework of Monte Carlo methods, the model simulates the stochastic… (more)

Zhang, Li

2008-01-01T23:59:59.000Z