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An enhanced convection‐wind‐evaporation feedback in a superparameterization GCM (SP‐GCM) depiction of the Asian summer monsoon
Author(s) -
Luo Zhengzhao,
Stephens Graeme L.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025060
Subject(s) - gcm transcription factors , monsoon , climatology , precipitation , convection , evaporation , environmental science , east asian monsoon , general circulation model , atmospheric sciences , meteorology , climate change , geology , physics , oceanography
Both the Colorado State University (CSU) and Goddard superparameterization GCM (SP‐GCM) simulate a superactive 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 an enhanced convection‐wind‐evaporation feedback. 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. Finally, we discuss the broader relevance of the feedback study to climate modeling.