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  • Other Sources  (14)
  • METEOROLOGY AND CLIMATOLOGY  (14)
  • 1
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    Climate sensitivity with a seasonal cycle energy balance model (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The sensitivity of climate which may have a local maximum as the ice cap passes through a midlatitude region where the atmosphere's transport efficiency varies strongly with latitude is examined. This behavior, found in a two level primitive equations climate model forced with annual mean insolation, was reproduced in an energy balance model (EBM) by making the diffusion coefficient a function of latitude. The two level seasonally varying EBM was applied and the global mean surface temperature vs. solar constant for this model are shown and two regions of enhanced sensitivity appear. The snowcover distributions around the year for three cases are shown.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 227-230
    Format: text
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  • 2
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    Stratocumulus simulations with a general circulation model (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Stratus and stratocumulus cloud sheets which are among the most common cloud types over the world are discussed. They are characteristic of the undisturbed subtropical marine boundary layer over the eastern oceans, where cool water and large scale sinking motion suppress penetrative cumulus convection. They also occur over the Arctic Ocean, particularly in summer, and behind cold outbreaks over the western oceans in winter. Observational studies were conducted and further observations are planned.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 222-226
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  • 3
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    On the dynamics of stratocumulus formation and dissipation (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Results obtained with a mixed layer model are used to study the dynamics of stratocumulus formation and dissipation in subtropical marine stratocumulus cloud regimes. The model used allows entrainment to be driven by shear as well as buoyancy, and includes a very crude parameterization of the partial blackness of thin cloud layers. Model results show that for some values of the large-scale divergence there are three equilibrium mixed layer structures, two of which are stable. One of the stable equilibria is cloudy, deep, and buoyancy-driven, while the other is clear, shallow, and shear-driven. It is found that as a result of hysteresis effects a transient increase in the large-scale divergence can produce a long-lasting break in the clouds.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 41; 3052-305
    Format: text
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  • 4
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    The parameterization of the planetary boundary layer in the UCLA general circulation model - Formulation and results (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: 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 vertical profiles. Both clear and cloud-topped boundary layers are parameterized. Particular emphasis is placed on the formulation of the coupling between the PBL and both the free atmosphere and cumulus convection. For this purpose a modified sigma-coordinate is introduced in which the PBL top and the lower boundary are both coordinate surfaces. The use of a bulk PBL formulation with this coordinate is extensively discussed. Results are presented from a July simulation produced by the UCLA GCM. PBL-related variables are shown, to illustrate the various regimes the parameterization is capable of simulating.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 111; 2224-224
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  • 5
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    A GCM Study of the Atmospheric Response to Tropical SST Anomalies (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-09
    Description: The purpose is to understand the evolution of the atmospheric anomalies associated with the most recent warm episode by the use of simulation studies with the UCLA general circulation model (GCM). The approach is to integrate the model using the observed sequence of Sea Surface Temperature (SST) anomalies during 1982 to 1983, and compare it with a control run in which all boundary conditions vary from month to month as in the climatology. The control for the experiment was a three year simulation using seasonally varying climatological SSTs. The anomaly calculation was initialized from 15 June of the first year of the control. From 15 June to 1 July, the SST was gradually modified by the anomalies observed during June and July of 1982. From 1 July on, the run was continued using the control's SST plus the 1982 to 1983 anomalies. SSTs were varied daily, interpolating between monthly means. This second integration as carried to the end of February of the second year (1983 in the anomaly). Only anomalies over the tropical Pacific were used.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 125-126
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  • 6
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    Design for and efficient dynamic climate model with realistic geography (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The long term climate sensitivity which include realistic atmospheric dynamics are severely restricted by the expense of integrating atmospheric general circulation models are discussed. Taking as an example models used at GSFC for this dynamic model is an alternative which is of much lower horizontal or vertical resolution. The model of Heid and Suarez uses only two levels in the vertical and, although it has conventional grid resolution in the meridional direction, horizontal resolution is reduced by keeping only a few degrees of freedom in the zonal wavenumber spectrum. Without zonally asymmetric forcing this model simulates a day in roughly 1/2 second on a CRAY. The model under discussion is a fully finite differenced, zonally asymmetric version of the Heid-Suarez model. It is anticipated that speeds can be obtained a few seconds a day roughly 50 times faster than moderate resolution, multilayer GCM's.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 231-232
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  • 7
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    Prospects for improvement of zonal mean temperatures in the UCLA general circulation model (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The scheme proposed by Katayama for the calculation of long wave radiative cooling rates is described. A number of offline calculations to test the new code were examined. It is suggested that the new scheme should alleviate the model's cold pole problem.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 215-218
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  • 8
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    Design of coupled ocean-atmosphere experiments (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A series of numerical experiments which couple an atmospheric general circulation model to an ocean model in an idealized basin are discussed. The role of ocean atmosphere interactions in the development of anomalous sea surface temperatures during an El Nino event is outlined.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 233-238
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  • 9
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    Postprocessing for the UCLA climate model (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Postprocessing programs written to analyze the results of a general circulation model are described. The model history data is interpolated to pressure surfaces, converted from 64-bit Cyber words to 32 bit IBM words, and transferred to tape for further analysis. The time average program reads the interpolation output tape and produces 15-day time averages. The model outputs a very detailed record for selected grid points. This data is sent to a tape in Cyber full words. The conversion program changes the format of the tape from 64 bit Cyber words to 32 bit IBM words, processing a month of data at a time. The grid-point history sorting program inputs the converted grid point history tape and sorts it by time. The end product is a tape with a time history of each field for every point. After the PBP data has been stored, it can be plotted. The plotting package is flexible, and allows the choice of fields and grid points. The one-dimensional fields are plotted as functions of time, and a daily summary is also produced. For the two-dimensional fields, time-height cross sections and daily summaries are produced. The model plotting package produces plots for all fields on the time average and pressure tapes. These plots include world maps, polar projections, zonal means, vectors, streamlines, and latitude-height plots.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Res. Rev., 1983; p 171-174
    Format: text
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  • 10
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    Some aspects of the new UCLA general circulation model (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A potential enstrophy conserving scheme and a modified beta-coordinate have been coded in the UCLA general circulation model. The new model is being tested with global simulation experiments.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center 4th NASA Weather and Climate Program Sci. Rev.; p 153-157
    Format: application/pdf
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