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Convection feedbacks in a super-parameterization GCM

Luo, Zhengzhao (Johnny) Colorado State University
Stephens, Graeme Colorado State University

Category: Modeling

Both the Colorado State University (CSU) and Goddard super-parameterization GCM (SP-GCM) simulate a super-active Asian summer monsoon with unrealistically enhanced levels of precipitation. The underlying physical mechanism for this monsoon bias in the CSU SP-GCM is shown to involve enhanced convection-wind-evaporation feedbacks. The feedback process is studied using two experiments with different fixed specifications of surface evaporation. A regional analysis of an area that exhibits excessive precipitation offers a glimpse of the transient nature of the feedback.

This poster will be displayed at the ARM Science Team Meeting.