CRMs and GCMs
The
CRMs are numerical models able to resolve cloud-scale circulations. For
example, in the case of precipitating deep convection, a CRM can resolve
individual convective cells (scale of few kms) while its domain encompasses the
entire convective system.
In
contrast, a GCM with typical grid size of 100 km. cannot resolve individual
convective cells. These subgrid-scale processes and the collective effects need
to be parameterized. These collective effects difficult to deduce from
observations can be easily determined from CRM simulations. A CRM domain can be
considered to represent a GCM grid volume and in this sense a CRM simulation could
produce a comprehensive 4D dataset of physical processes occuring in this GCM
volume.
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