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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:
- Sea-ice cove
- Snow density
- Sea surface temperature
- Volumetric soil water layer 1
- Volumetric soil water layer 2
- Volumetric soil water layer 3
- Volumetric soil water layer 4
- Soil temperature level 1
- Snow depth
- 2 metre temperature
- 2 metre dewpoint temperature
- Soil temperature level 2
- Soil temperature level 3
- Temperature of snow layer
The other ERA-20C analysed surface parameters are available 3 hourly. All the ERA-20C forecast surface parameters are available 3 hourly (from daily forecasts beginning at 0600UTC).
For further details please see the ECMWF product page.
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Some ERA-20C references available from the ECMWF E-Library.
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