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Convention used in MARS: the date and time of the data is specified with three MARS keywords, 'date', 'time' and 'step'. For parameters labelled as analyses (see list of parameters), step=0 hours so that date and time specify the analysis time. All forecasts start at 00UTC (time=00 hours), and for parameters labelled as forecasts (see list of parameters), date specifies the forecast start day and step specifies the number of hours since the start of the forecast, with a maximum of step=24 hours. The combination of date, time and forecast step defines the validity date/time. For analyses, the validity date/time is equal to the analysis date/time.
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- HRES: accumulations are from 00 UTC to the hour ending at the forecast step
- For the CDS time, or validity time, of 00 UTC, the accumulations are over the 24 hours ending at 00 UTC i.e. the accumulation is during the previous day
- Synoptic monthly means (stream=mnth): accumulations have units of "variable_units per forecast_step hours"
- Monthly means of daily means (stream=moda): accumulations have units that include "per day", see section Monthly means
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name | units | shortName | paramId | an | fc | GRIB1 | GRIB2 | |
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| 1 | Lake mix-layer temperature | K | lmlt | 228008 | x | x | ||
| 2 | Lake mix-layer depth | m | lmld | 228009 | x | x | ||
| 3 | Lake bottom temperature | K | lblt | 228010 | x | x | ||
| 4 | Lake total layer temperature | K | ltlt | 228011 | x | x | ||
| 5 | Lake shape factor | dimensionless | lshf | 228012 | x | x | ||
| 6 | Lake ice temperature | K | lict | 228013 | x | x | ||
| 7 | Lake ice depth | m | licd | 228014 | x | x | ||
| 8 | Snow cover | % | snowc | 260038 | x | x | ||
| 9 | Snow depth | m | sde | 3066 | x | x | ||
| 10 | Snow albedo | (0 - 1) | asn | 32 | x | x | ||
| 11 | Snow density | kg m**-3 | rsn | 33 | x | x | ||
| 12 | Volumetric soil water layer 11 | m**3 m**-3 | swvl1 | 39 | x | x | ||
| 13 | Volumetric soil water layer 21 | m**3 m**-3 | swvl2 | 40 | x | x | ||
| 14 | Volumetric soil water layer 31 | m**3 m**-3 | swvl3 | 41 | x | x | ||
| 15 | Volumetric soil water layer 41 | m**3 m**-3 | swvl4 | 42 | x | x | ||
| 16 | Leaf area index, low vegetation | m**2 m**-2 | lai_lv | 66 | x | x | ||
| 17 | Leaf area index, high vegetation | m**2 m**-2 | lai_hv | 67 | x | x | ||
| 18 | Surface pressure | Pa | sp | 134 | x | x | ||
| 19 | Soil temperature level 11 | K | stl1 | 139 | x | x | ||
| 20 | Snow depth | m of water equivalent | sd | 141 | x | x | ||
| 21 | 10 metre U wind component | m s**-1 | 10u | 165 | x | x | ||
| 22 | 10 metre V wind component | m s**-1 | 10v | 166 | x | x | ||
| 23 | 2 metre temperature | K | 2t | 167 | x | x | ||
| 24 | 2 metre dewpoint temperature | K | 2d | 168 | x | x | ||
| 25 | Soil temperature level 21 | K | stl2 | 170 | x | x | ||
| 26 | Soil temperature level 31 | K | stl3 | 183 | x | x | ||
| 27 | Skin reservoir content | m of water equivalent | src | 198 | x | |||
| 28 | Skin temperature | K | skt | 235 | x | x | ||
| 29 | Soil temperature level 41 | K | stl4 | 236 | x | x | ||
| 30 | Temperature of snow layer | K | tsn | 238 | x | x | ||
| 31 | Forecast albedo | (0 - 1) | fal | 243 | x | x |
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Table 2: stream=oper/mnth/moda, levtype=sfc: surface parameters: accumulations
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Accumulations are described in section ERA5-Land data documentation 140385203. The accumulations in monthly means (stream=moda/mnth) are described in section monthly means
How to use lake-related fields
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