A cloud resolving model as a cloud parameterization in the NCAR community climate system model: Preliminary results

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Meteorology And Atmospheric Dynamics: Climatology, Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation

Scientific paper

Preliminary results of a short climate simulation with a 2-D cloud resolving model (CRM) installed into each grid column of an NCAR Community Climate System Model (CCSM) are presented. The CRM replaces the conventional convective and stratiform cloud parameterizations, and allows for explicit computation of the global cloud fraction distribution for radiation computations. The extreme computational cost of the combined CCSM/CRM model has thus far limited us to a two-month long climate simulation (December-January) using 2.8°×2.8° resolution. The simulated geographical distributions of the total rainfall, precipitable water, cloud cover, and Earth radiation budget, for the month of January, look very reasonable.

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