High resolution CRM output from an initial global MMF simulation (of 500 days) along with output from the parent (parameterized) GCM has been compared against data obtained from the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program sites [Ovtchinnikov et al., 2004]. Results of this comparison showed that the MMF simulation produced improvement in the representation of clouds and precipitation in the tropical Pacific but not in the Southern Great Plains (SGP) of the United States.
In this article, we extend the previous studies by Khairoutdinov and Randall  and Ovtchinnikov et al.  in comparing MMF and standard CAM climate model output with top of atmosphere fluxes retrieved from the NASA Clouds and Earth's Radiant Energy System (CERES) instrument [Wielicki et al. 1996] and cloud properties retrieved by the International Satellite Cloud Climatology Project (ISCCP) [Rossow and Schiffer 1999]. We use the ISCCP D1 data (in which all cloudy pixels in a grid-box are placed in one of 42 cloud optical thickness-cloud top pressure types) and compare this data to model output using an ISCCP-simulator following the approach of Webb et al. .