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contributor authorAlbrecht, Bruce A.
date accessioned2017-06-09T14:24:08Z
date available2017-06-09T14:24:08Z
date copyright1983/09/01
date issued1983
identifier issn0022-4928
identifier otherams-18646.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154674
description abstractA scheme for parameterizing the effects of cumulus convection for the maintenance of the thermodynamic structure of the tropical atmosphere is described. This parameterization is used in a one-dimensional model that represents the vertical structure of the atmosphere as a function of Chebyshev polynominals. The convective fluxes in this model are represented as a product of an ?effective? convective mass flux and cloud-environment differences in thermodynamic properties for a reference cloud. The conversion of cloud water to precipitation is assumed to be proportional to the cloud water content. The effects of shallow clouds on the thermodynamic structure new cloud base are represented by constraining the derivative of the mass flux near cloud base. An equilibrium assumption is used to obtain the mass flux associated with deep clouds. The sensitivity of the vertical distributions of the parameterized heating and moistening rates to cloud model assumptions is determined. The inefficient conversion of cloud water to precipitation significantly cools and moistens the upper portion of the cloud layer. The evaporation of rain significantly cools the lower layers, although in the moisture budget the evaporation of rain is less important than other effects. The importance of shallow clouds for maintaining the heat and moisture budgets near cloud base is clearly demonstrated.
publisherAmerican Meteorological Society
titleA Cumulus Parameterization for Climate Studies of the Tropical Atmosphere. Part I: Model Formulation and Sensitivity Tests
typeJournal Paper
journal volume40
journal issue9
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1983)040<2166:ACPFCS>2.0.CO;2
journal fristpage2166
journal lastpage2182
treeJournal of the Atmospheric Sciences:;1983:;Volume( 040 ):;issue: 009
contenttypeFulltext


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