Sources and sinks of entropy in the atmosphere

Moist entropy is generally treated as a conserved variable in atmospheric models in the absence of external heat and moisture sources such as radiation and surface fluxes. However, both irreversible generation and nonadvective transport of entropy occur in the atmosphere, with many of these associat...

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Bibliographic Details
Published in:Journal of advances in modeling earth systems 2013-12, Vol.5 (4), p.755-763
Main Author: Raymond, David J.
Format: Article
Language:English
Subjects:
Atmosphere
atmospheric modeling
Atmospheric models
convection
Entropy
Entropy budget
Heat
Moisture
Precipitation
Radiation
Surface fluxes
Textbooks
Transport
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Summary:Moist entropy is generally treated as a conserved variable in atmospheric models in the absence of external heat and moisture sources such as radiation and surface fluxes. However, both irreversible generation and nonadvective transport of entropy occur in the atmosphere, with many of these associated with moisture and precipitation. These entropy sources and sinks are needed to balance the global entropy budget. Existing work on calculating the irreversible generation of entropy and nonadvective transport is extended to include the major effects of ice. Key Points The moist entropy budget must be treated correctly in climate models A means of eliminating numerical entropy sources in models is presented Physical entropy sources in the atmosphere are assessed
ISSN:1942-2466
1942-2466
DOI:10.1002/jame.20050