HR: 16:35h
AN: A44B-02 INVITED     [Abstracts]
TI: Clouds in GEOS-5
AU: * Bacmeister, J
EM: bacmj@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
AU: Rienecker, M M
EM: Michele.Rienecker@nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
AU: Suarez, M J
EM: Max.J.Suarez@nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
AU: Norris, P M
EM: pnorris@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
AB: The 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.
DE: 3314 Convective processes
DE: 3337 Global climate models (1626, 4928)
DE: 3354 Precipitation (1854)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly