Results 291 to 300 of about 213,098 (343)

Some remarks on cumulus parameterization

pure and applied geophysics, 1988
A simple parameterization of cumulonimbus convective heating is presented. The model is primarily based on preserving a moisture budget and on detraining cloud air at levels corresponding to the neutral buoyancy of the air converged at low levels. Results are compared with data from the western Pacific and GATE. Agreement is good.
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The Arakawa-Schubert Cumulus Parameterization

1993
The motivation of the paper by Arakawa and Schubert (1974) (hereafter referred to as A-S) was to present a theoretical framework that can be used for understanding the physical and logical basis for cumulus parameterization. More specifically, the paper attempted to answer the following questions: 1) How can cumulus clouds modify their ...
Akio Arakawa, Ming-Dean Cheng
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Wave-CISK and Cumulus Parameterization

Journal of the Atmospheric Sciences, 1976
Abstract A linearized version of the cumulus parameterization theory of Arakawa and Schubert (1974) is used in an equatorial wave model to test the wave-CISK hypothesis under the quasi-equilibrium assumption. A unique relationship between cumulus heating and large-scale vertical motion at all levels is derived.
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The Cumulus Parameterization Problem

Monthly Weather Review, 1983
Abstract In the past two decades there has been extensive research into the nature of atmospheric convection and scale interactions in cumulus regimes. A major goal of these efforts has been to advance the state of the art in cumulus parameterization. This paper reviews the cumulus parameterization problem in terms of fundamental principles, goals and ...
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Non-precipitating cumulus convection and its parameterization

Quarterly Journal of the Royal Meteorological Society, 1973
AbstractThis paper discusses the thermodynamic transports of heat, liquid water and (briefly) water vapour by non‐precipitating cumulus convection. It is shown that because of the irreversible mixing between cloud and environment, there is a downward transport of enthalphy in the cumulus layer.
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Parameterization of Trade-Cumulus Cloud Amounts

Journal of the Atmospheric Sciences, 1981
Abstract A scheme for parameterizing the fractional cloud coverage of trade cumuli is developed which gives the cloud cover in terms of the cloud-layer relative humidity and the liquid water content of the convective elements. This parameterization gives good agreement with cloud observations obtained during the Atlantic Trade-Wind Experiment, 1969 ...
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Cumulus cloud population and its parameterization

pure and applied geophysics, 1975
The latent heat released by cumulus clouds is very important to the energies of many large-scale tropical disturbances. The number of cumulus clouds involved in these disturbances is usually very large. The collective effects of cumulus clouds must therefore be incorporated into a large-scale model in a parameterized fashion.
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A Simple Parameterization for Detrainment in Shallow Cumulus

Monthly Weather Review, 2008
Abstract For a wide range of shallow cumulus convection cases, large-eddy simulation (LES) model results have been used to investigate lateral mixing as expressed by the fractional entrainment and fractional detrainment rates. It appears that the fractional entrainment rates show much less variation from hour to hour and case to case ...
A. Pier Siebesma, Wim C. de Rooy
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Cumulus dynamics: Local compensating subsidence and its implications for cumulus parameterization

pure and applied geophysics, 1975
Observations of air flow in and around convective clouds are summarized and discussed in light of the requirements for parameterization of midlatitude convection. Both theory and observation indicate that a substantial portion of the compensating subsidence occurs as dry downdrafts in the immediate vicinity of convective clouds, which suggests that an ...
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Observational Constraints on Cumulus Parameterizations

1993
Observational tests of cumulus parameterizations are difficult. Since cumulus convection is generally embedded in a larger-scale flow pattern in which many feedbacks are acting, it is hard to tell what is causing what to happen. For those aspects of convection tightly embedded in feedback loops, the change in convective behavior caused by environmental
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