Difficulties in the Subgrid-Scale Redistribution of Moisture of a Global Cloud-Resolving Model
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More than one decade has passed since the first global cloud-resolving simulation was achieved under an aquaplanet condition in 2005. While such high-resolution global simulations have been beneficial not only to advance our knowledge of organized cloud systems but also to give various hints on improvements of traditional global models that depend on a kind of cumulus parameterization, explicit computations of cloud microphysics cannot necessarily ensure realistic representations of clouds and climate. A direct coupling between fluid dynamics and cloud processes is a strong point of the global cloud-resolving approach, but there still remain various rooms of uncertainties. Here, we briefly summarize successful and unsuccessful results of global or near-global simulations with explicit cloud microphysics and discuss a difficulty in the subgrid-scale redistribution of moisture.
KeywordsGlobal cloud-resolving model Subgrid-scale processes Moisture
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