Is the field called geopotential height of the earths 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 three times. There was a change on 21 September 1994 and a change on 27 January 1998 which have no effect on the values. A change made on 22 January 1998 did cause some differences and fields before this date will be different from fields after this date. Otherwise this field is the same throughout the period. This change only affects this particular field and only in the grbsanl file. The same field on the 2.5×2.5 lat-lon grid is not affected and is the same throughout the period. • Why are the results prior to 1957JUN every 3 hours instead of 6 hours?[3/9/2000] >From ftp://ftp.cpc.ncep.noaa.gov/wd51we/reanal/random_notes/pre1957.tim Analysis Times —- Currently the traditional times for launching sondes are 00Z, 06Z, 12Z and 18Z with the 00Z and 12Z having the most launches. Howeve
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