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Climate Variability & Change, Weather

The major goal of this proposed research is to improve the representation of the diurnal cycle of warm season precipitation in the NASA GEOS-5 GCM. The research aims to 1) improve our understanding of the convective precipitation process and the important mechanisms that drive the diurnal cycle. We will analyze the available satellite, ground-based, and special field observations for precipitation, cloud, radiation, and the large-scale circulation to get a better insight on the diurnal cycle. 2) The research will assess the modeling capability of the convective precipitation and the diurnal cycle processes. We will take advantage of the non-parameterized cloud resolving models (CRMs) to diagnose the problems and the limitations of the parameterized GCMs. The simulation by CRMs will be compared with that by the stand-alone version of the moist physics in the GEOS-5 model (i.e., single-column model) as well as fully-interactive global model simulations in order to identify the deficiencies in the moist physics parameterizations. 3) Based on the outcomes from 1) and 2), we will develop and implement an improved convection and moist physics parameterizations for GEOS-5.

Project PI: Myong-In Lee/NASA Goddard Space Flight Center

Code 610.1, Global Modeling and Assimilation Office (GMAO) NASA/GSFC, Greenbelt, MD 20771

Phone: 301-614-5314

Fax: 301-614-6270

Email: milee@gmao.gsfc.nasa.gov

http://gest.umbc.edu/directory/lee_myong-in.pdf

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Started: Aug 10, 2010

Last Activity: Dec 15, 2010

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