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Both ERA/Interim and ERA-Interim/Land use four soil depth layers as follows:
| Level | Top (m) | Bottom (m) | Thickness (m) |
|---|---|---|---|
| 1 | 0.0 | 0.07 | 0.07 |
| 2 | 0.07 | 0.28 | 0.21 |
| 3 | 0.28 | 1 | 0.72 |
| 4 | 1 | 2.89 | 1.89 |
Soil moisture is available in both datasets with values typically between 0.1 and 0.4 in cubic meter water per cubic meter volume. ERA-Interim/Land should be preferred over ERA-Interim and make sure to select 'Analysis' when downloading the ERA-Interim/Land data.
...
van den Hurk, B., P. Viterbo, A. Beljaars and A.K. Betts, 2000: Offline validation of the ERA-40 surface scheme, ECMWF Tech. Memo. 295,44 pp., doi: 10.21957/9aoaspz8
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