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History of modifications to this Product User Guide
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Table 1: Overview of variables calculated as a mean value of a grid box.
Name | ShortName | Unit | GRIB2 Code | Analysis | Forecast range | Height |
Albedo | al | % | 260509 | no | yes | surface |
Evaporation | eva | kg m-2 | 260259 | no | yes | surface |
Total precipitation | tp | kg m-2 | 228228 | yes | no | surface |
Skin temperature | skt | K | 235 | no | yes | surface |
Surface latent heat flux | slhf | J m-2 | 147 | no | yes | surface |
Surface sensible heat flux | sshf | J m-2 | 146 | no | yes | surface |
Surface net solar radiation | ssr | J m-2 | 176 | no | yes | surface |
Surface solar radiation downwards | ssrd | J m-2 | 169 | no | yes | surface |
Surface net thermal radiation | str | J m-2 | 177 | no | yes | surface |
Surface thermal radiation downwards | strd | J m-2 | 175 | no | yes | surface |
Soil heat flux | sohf | W m-2 | 260364 | no | yes | surface |
Surface roughness | sr | m | 173 | no | yes | surface |
Albedo
The albedo [0-100%] is the total reflectance of downward solar radiation at the surface over the grid box. The albedo is the ratio of one hour time-integrated surface solar radiation upward by the one hour time-integrated surface solar radiation downward. Multiplying the albedo with the one hour accumulated downward solar radiation gives the one hour accumulated upward solar radiation.
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Table 2: Overview of variables available for the natural land fraction.
Name | ShortName | Unit | GRIB2 Code | Analysis 0, 3 …, 21 (or daily) | Forecast range 1, 2, 3 | Height |
Fraction of snow cover (Instantaneous) | fscov | dimensionless | 260289 | no | yes | surface |
Snow depth (Instantaneous) | sde | m | 3066 | no | yes | surface |
Snow depth water equivalent (Instantaneous) | sd | kg m-2 | 228141 | no | yes | surface |
Snow density (Instantaneous) | rsn | kg m-3 | 33 | no | yes | surface |
Snow albedo (Instantaneous) | asn | dimensionless | 228032 | no | yes | surface |
Temperature of snow layer (Instantaneous) | tsn | K | 238 | no | yes | surface |
Snow melt (accumulated) | snom | kg m-2 | 3099 | no | yes | surface |
Percolation (accumulated) | perc | kg m-2 | 260430 | no | yes | surface |
Surface runoff (accumulated) | sro | kg m-2 | 174008 | no | yes | surface |
Soil temperature (Instantaneous) | sot | K | 260360 | no | yes | Soil (14 layers) |
Volumetric soil moisture (Instantaneous) | wsw | m3m-3 | 260199 | no | yes | Soil (14 layers) |
Liquid volumetric soil moisture (non-frozen) (Instantaneous) | liqvsm | m3m-3 | 260210 | no | yes | Soil (14 layers) |
Fraction of snow cover
It represents the fraction of natural land covered by snow. It is an instantaneous variable and takes values between 0 and 1.
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Table 3: Overview of variables available for the inland water fraction.
Name | ShortName | Unit | GRIB2 Code | Analysis | Forecast range | Height |
Lake bottom temperature | lblt | K | 228010 | yes | no | surface |
Lake ice depth | licd | m | 228014 | no | yes | surface |
Lake ice temperature | lict | K | 228013 | no | yes | surface |
Lake mix-layer depth | lmld | m | 228009 | no | yes | surface |
Lake mix-layer temperature | lmlt | K | 228008 | no | yes | surface |
Lake shape factor | lshf | dimensionless | 228012 | no | yes | surface |
Lake total layer temperature | ltlt | K | 228011 | no | yes | surface |
Lake bottom temperature
Temperature of water at the bottom of inland water bodies (lakes). The model keeps lake depth and surface area (or fractional cover) constant in time. It is an instantaneous variable.
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Static variable do not change depending on the model initial time or the forecast length (in other words they are time-independent). These include the land-sea mask, that is the fraction of land in a given model grid box of 5.5 x 5.5 km2 in units of %, and the orography in units of m. For each model grid box in CERRA-Land, 3 tile fractions are defined in units of %: (1) the fraction of inland water (lakes and rivers), (2) the fraction of urban areas, and (3) the fraction of nature, i.e. land areas that are not inland water or urban. There is no data available for the fraction of sea. The fraction data will be available directly from the climate data store website in netCDF format.
Table4: Static Static variable. The variables marked with * and labelled with TBD ("To Be Determined") do not have yet short
names in the WMO GRIB2 code definitions and have not been uploaded to the CDS in the first batch of released data.
The fraction data can be downloaded as netcdf file format: CERRALand_tiles_fraction.nc
ShortName | Unit | GRIB2 Code | Analysis 0, 3 …, 21 (or daily) | Forecast range 1, 2, 3 | Height | |
Lake depth | dl | m | 228007 | no | no | surface |
Volumetric wilting point | vwiltm | m3 m-3 | 260200 | no | no | Soil (14 layers) |
Volumetric transpiration stress-onset (soil moisture) | voltso | m3 m-3 | 260211 | no | no | Soil (14 layers) |
Land-sea mask | lsm | dimensionless | 172 | no | no | surface |
Orography | orog | m | 228002 | no | no | surface |
Inland water tile fraction* | TBD | dimensionless | TBD | no | no | surface |
Urban tile fraction* | TBD | dimensionless | TBD | no | no | surface |
Nature tile fraction* | TBD | dimensionless | TBD | no | no | surface |
Lake depth
Depth of inland water. It is defined for positive fractions only. It is a static variable.
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Soci C., Bazile E., Besson F., and Landelius T. (2016). High-resolution precipitation re-analysis system for climatological purposes. Tellus A, Dynamic Meteorology and Oceanography, 68:1, DOI: 10.3402/tellusa.v68.29879
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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