How is sea surface temperature field used in Reanalysis processing?
[6/23/2000] GISST v2.2 from the UK Met Office was used prior to 1982 and Reynolds SST for later years. GISST was a monthly data set which was interpolated to daily values. The Reynolds SST was a weekly SST analyses interpolated to daily values. The CDAS currently runs using a daily SST analyses using a 6 or 7 day sliding window for it’s input data. • What does NCEP use for the gravity constant in Reanalysis processing?[5/5/2000] In nearly all processing, NCEP uses 9.8 exactly as the gravity constant. The only exceptions are that a value of 9.81 is used to compute mass weight variables on isentropic surfaces and to compute pressure levels of the isentropic surfaces. • Is the field called geopotential height of the earth’s surface always the same throughout the entire Reanalysis period?[5/5/2000] The geopotential height of the earth’s surface that is stored in the grbsanl file on the Gaussian grid is derived from the spectral sigma file and the code that does this derivation has changed
