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The Snow Analysis used in the CFSR
Snow liquid equivalent depth was updated using analysis data from the Air Force Weather Agency’s SNODEP model (Kopp et al. 1996) and the NESDIS Interactive Multisensor Snow and Ice Mapping System (IMS) (Helfrich et al. 2007). SNODEP uses in situ observations, an SSM/I-based detection algorithm, and its own climatology to produce a global analysis of physical snow depth once per day at 47 km resolution. Analysts may further adjust the analysis. SNODEP has been operational since 1975 and its data were available for the entire reanalysis period. The IMS data is a manually generated northern hemisphere snow cover analysis produced once per day. Analysts use surface data, geostationary and polar orbiting imagery, and microwave-based detection algorithms to determine whether an area is either snow covered or snow free. IMS data were available at 23 km resolution starting February 1997 and at 4 km resolution starting February 2004.