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A conceptual model for entrainment in cumulus clouds

DSpace at IIT Bombay

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Title A conceptual model for entrainment in cumulus clouds
 
Creator AGRAWAL, A
 
Subject buoyancy reversal
congestus clouds
turbulent jet
detrainment
convection
plumes
 
Description Cumulus clouds are generally modeled as a plume, and the model works well up until the cloud base is encountered, beyond which the continuously entraining model does not appear appropriate. Although it has been known for a long time that cumulus clouds have very little lateral entrainment, the reason for it is not evident. An expression for the mean streamwise velocity profile as a Gaussian multiplied by a fourth-order polynomial factor is hereby proposed such that the mass and momentum fluxes are decoupled. This model suggests that cumulus clouds differ from other shear flows in that the former need not interact with the ambient for some downstream distance. The proposed model replicates a number of characteristics of cumulus clouds like a conserved mass flux with varying momentum flux, and may therefore be employed to describe them, in a time-averaged sense, beyond the cloud base.
 
Publisher AMER METEOROLOGICAL SOC
 
Date 2011-07-16T18:51:54Z
2011-12-26T12:49:55Z
2011-12-27T05:35:44Z
2011-07-16T18:51:54Z
2011-12-26T12:49:55Z
2011-12-27T05:35:44Z
2005
 
Type Article
 
Identifier JOURNAL OF THE ATMOSPHERIC SCIENCES, 62(7), 2602-2606
0022-4928
http://dx.doi.org/10.1175/JAS3499.1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4504
http://hdl.handle.net/10054/4504
 
Language en