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Evaluating Prognostic Parameterizations Using ARM Data at the Three Major ARM Sites

A single-column model (SCM) and the National Center for Atmospheric Research (NCAR) Community Atmospheric Model v2.0 (CAM2) are used to examine the sensitivity of radiative fluxes to the parameterization of cloud microphysics at the Atmospheric Radiation Measurement (ARM) Program sites. Our results generally demonstrate the superiority of parameterizations based on comprehensive treatments of cloud microphysics and cloud-radiative interactions. At the Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites, and to a lesser extent at the Tropical Western Pacific (TWP) site, the SCM results simulate the ARM measurements well and are often more realistic than parameterizations found in conventional operational forecasting models.