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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 covecover
- 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
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