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ERA-20C assimilates observations of surface pressure and surface marine winds only. It is an outcome of the ERA-CLIM project.
The ERA-20C analysed surface parameters that are only available 6-hourly are those that are produced by the land-surface analysis scheme. Separate from the 4D-Var assimilation, the land-surface analysis scheme runs every 6 hours and only produces one temporal estimate at the centre of each 6-hour window. These 6-hourly parameters are:
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