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Clouds in GEOS-5The GEOS-5 atmospheric model is being developed as a weather-and-climate capable model. It must perform well in assimilation mode as well as in weather and climate simulations and forecasts and in coupled chemistry-climate simulations. In developing GEOS-5, attention has focused on the representation of moist processes. The moist physics package uses a single phase prognostic condensate and a prognostic cloud fraction. Two separate cloud types are distinguished by their source: "anvil" cloud originates in detraining convection, and large-scale cloud originates in a PDF-based condensation calculation. Ice and liquid phases for each cloud type are considered. Once created, condensate and fraction from the anvil and statistical cloud types experience the same loss processes: evaporation of condensate and fraction, auto-conversion of liquid or mixed phase condensate, sedimentation of frozen condensate, and accretion of condensate by falling precipitation. The convective parameterization scheme is the Relaxed Arakawa-Schubert, or RAS, scheme. Satellite data are used to evaluate the performance of the moist physics packages and help in their tuning. In addition, analysis of and comparisons to cloud-resolving models such as the Goddard Cumulus Ensemble model are used to help improve the PDFs used in the moist physics. The presentation will show some of our evaluations including precipitation diagnostics.
Document ID
20070031943
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Bacmeister, Julio
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rienecker, Michele
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Suarez, Max
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Norris, Peter
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
May 22, 2007
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: American Geophysical Union 2007 Joint Assembly
Location: Acapulco
Country: Mexico
Start Date: May 22, 2007
End Date: May 25, 2007
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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