A new approach for 3D cloud resolving simulations of large
scale
atmospheric circulation
Kuang, Z., P. N. Blossey, C. S. Bretherton
Geophys. Res. Letts., accepted.
Abstract
We present a computationally efficient new method for simulating the
interactions of large-scale atmospheric circulations with deep
convection in a 3D cloud-resolving model. This is accomplished by
reducing the scale difference between the large-scale and convective
circulations. Our method, Diabatic Acceleration and REscaling (DARE),
consists of accelerating all diabatic processes, reducing the planetary
radius and increasing its rotation rate. A second useful interpretation
of this rescaling, Reduced Acceleration in the VErtical (RAVE) is also
presented briefly. The DARE/RAVE approach is expected to be useful for
a wide range of problems involving interactions between large-scale
circulation, deep convection, and associated cloud and radiation
processes, whose investigation has long been plagued by deficiencies in
cumulus/cloud parameterizations. Initial results from a near-global
scale equatorial beta-plane simulation using the DARE approach are
briefly presented.
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Zhiming
Kuang <kzm@atmos.washington.edu>