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A simple model of evaporatively driven downdraft - Application to microburst downdraftIt is pointed out that the physics of a downdraft are very different from that of an updraft. An updraft is virtually saturated, while the downdraft can be unsaturated. The present investigation is concerned with the dynamics of a simple one-dimensional, time-dependent model of a downdraft. Earlier treatments are extended on the basis of a number of considerations, taking into account a distribution of drop sizes, modification of the drop size distribution by evaporation, entrainment of environmental air into the downdraft, and, most importantly, explicit calculation of the intensity of the downdraft. A large number of calculations are performed to study the effects of conditions at the top of the downdraft and in the environment.
Document ID
19850056921
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Srivastava, R. C.
(Chicago, University Chicago, IL; National Center for Atmospheric Research, Boulder, CO, United States)
Date Acquired
August 12, 2013
Publication Date
May 15, 1985
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 42
ISSN: 0022-4928
Subject Category
Meteorology And Climatology
Report/Patent Number
ISSN: 0022-4928
Accession Number
85A39072
Funding Number(s)
CONTRACT_GRANT: DOT-FA01-82-Y-10513
CONTRACT_GRANT: NASA ORDER H-53914-B
Distribution Limits
Public
Copyright
Other

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