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Physical Processes

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Theme Leaders : Chin-Hoh Moeng, Steve Krueger

CSRMs used in MMFs and GCRMs (global CSRMs) may have horizontal grid sizes
of 4 km or more, and correspondingly large vertical grid sizes. In MMFs and
GCRMs, CSRMs are expected to represent all types of cloud systems. However,
many cloud-scale processes are not resolved by such coarse-grid CSRMs. Our
objective is to improve the representation of SGS convection, turbulence,
and microphysics in CSRMs used in MMFs and GCRMs.

At the moment, two different approaches are being considered. One is the
PDF/Higher-Order Closure method, in which the statistics of the SGS processes
are predicted or diagnosed. The other is a two-scale MMF approach in which a
fine-grid, small-domain 2D eddy-resolving model is run in parallel with the
standard coarse grid CSRM. We will collaborate with Low Cloud Feedbacks and
MJO focus groups in order to define an optimal MMF CSRM configuration.

The initial emphasis is to better represent the SGS convection and
turbulence. But it is also important to better represent SGS precipitation
physics and the effects of surface inhomogeniety (both resolved and SGS).

Our strategy is to evaluate coarse-grid CSRM simulations using new
high-resolution (benchmark) simulations, as well as high-resolution
observational datasets.


Reports & PresentationsOther meeting presentations found here.


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