27th Conference on Hurricanes and Tropical Meteorology


The origin of systematic errors in the GCM simulation of ITCZ precipitation

Winston C. Chao, NASA/GSFC, Greenbelt, MD; and M. J. Suarez, J. T. Bacmeister, B. Chen, and L. L. Takacs

Previous GCM studies have found that the systematic errors in the GCM simulation of the seasonal mean ITCZ intensity and location could be substantially corrected by adding suitable amount of rain re-evaporation or cumulus momentum transport. However, the reason(s) for these systematic errors and solutions has remained a puzzle. In this work the knowledge gained from previous studies of the ITCZ in an aqua-planet model with zonally uniform SST is applied to solve this puzzle. The solution is supported by further aqua-planet and full model experiments using the latest version of the Goddard Earth Observing System GCM.

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Session 7D, Tropical Convection I
Wednesday, 26 April 2006, 8:00 AM-10:00 AM, Big Sur

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