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- The physiography data including the divisions of sub-grid tiles into sea, nature, inland water and urban fractions is based on combined ECOCLIMAP-I and ECOCLIMAP-II data. However, ECOCLIMAP-II (Faroux et al. 2013, https://gmd.copernicus.org/articles/6/563/2013/ data is not defined for Iceland, Svalbard and the Russian Arctic islands. This means that there is a minor inconsistency in the static tile fraction fields in these regions with respect to all the other regions in CARRA. As an example this inconsistency might manifest in differences in urban areas outside the ECOCLIMAP-II region.
- Be careful when using the single level, pressure level and model level wind component variables - they are pointing to the local grid directions and not to the geographic east-west or north-south directions. Please note that this is not an issue, but a choice, which might not be trivial for the users. The variables 10m wind direction (in the single level entry) and the wind direction at selected height levels (in the height level entry) do not have this issue.
- Due to some technical problems some very small amount of data (less than 0.4% of the single level dataset) were missing in the original publication. These gaps were later covered with re-running the CARRA system and now they are available in the CDS. Please note that these re-runs were done on the new ECMWF ATOS computer platform and not in the originally used CRAY platform. Since the consistency between the CARRA system on CRAY and ATOS was demonstrated this does not cause any inconsistency in the dataset.
- The surface latent heat flux computation is incorrectly related only to liquid water even if the surface temperature is below zero. This has an effect on the CARRA surface latent heat flux variable. The 2m relative humidity variable is related to saturation humidity over water as its standard definition.
- Albedo data: Albedo data is provided both at analysis and forecast times, but only the forecast time data are recommended for use. Due to rounding errors in the albedo calculation routine, unphysical albedo values (>100%) will sometimes occur. See Section 5.5 of the Data User Guide for further details.
Data availability issues
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Sensible and Latent heat fluxes are available only on time step +3 for the following periods: CARRA-East:
CARRA-West:
The parameter Sea-ice thickness is only being archived after July 2022. We are working on back-archiving this parameter for the rest of the dataset. The parameter Snow on ice total depth is missing for some isolated dates. These are: CARRA-East:
CARRA-West:
The following parameters are missing for various short, intermittent periods for single levels throughout the dataset. These will be back-archived as soon as possible:
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