Island Rainfall Enhancement in the Maritime Continent

J.H. Ruppert & X. Chen
The hypothesis that the islands of the Maritime Continent (MC) enhance total rainfall and time-mean upward motion is tested using a convection-permitting regional model. Sensitivity experiments with the islands removed greatly diminish both rainfall and upward motion, supporting the hypothesis. We examine the individual factors in this enhancement, isolating the impacts of the diurnal cycle from those of basic-state (i.e., constant) forcing of orography and the land surface. We find that the basic-state forcing by...
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