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Data and metadata deficiencies
(*) The affected member remains in the CDS, and was used in the hindcast climatology for the relevant sea ice concentration data and graphical products. This has a minimal impact on the statistics of the model climatology, and therefore on our real-time forecast products (with August starts). Feedback on this approach is welcome. |
Data and metadata deficiencies
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Data gaps
Note: (1) See description of nominal start dates here
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Known issue number | Centre | Forecasts | or Hindcasts Start dates(1) | Description | D1. | Met Office Both | All | Near-surface temperatures (6-hourly and daily minimum and maximum) and dewpoint temperature are encoded as being calculated at a height of 2m.
Hindcasts: May-Dec and January | Forecasts: Sep2017 to Jan2018 Global grid is incomplete (just 180 latitude points, between 90S and 89N) Note that additionally, in this grid all points are set at integer values of latitude/longitude D3. All parameters on pressure levels are not globally complete, having "missing value indicators" in points below the orography. D4. | Météo-France | (system=5) Forecasts | All | There is an issue with the postprocessing used at origin of the lagged start dates. Only members #27 to #51 are affected having data with a time shift of 7 days (168 hours). For instance, data with date/time labelled as YYYYMM08 00h would in fact correspond to YYYYMM01 00h. D5. | CMCC | (system=3) Hindcasts | Years between 1993 and 1999 | There are anomalous values of SST (and associated parameters, e.g. fluxes, and vertical oceanic temperature profiles) appearing in the first hours of a very limited number of ensemble members of forecasts. The issue is caused by a bug in the oceanic perturbation generation tools used at origin to produce the ocean initial conditions. The errors/perturbations appear initially as excessively high SST values, confined to the reported hindcast years, in a limited number of grid points all in the tropical Pacific. They are very quickly dissipated by the coupled model physics and dynamics, affecting, therefore, only the first 24 hours of the forecasts at most. D6. | CMCC | (system=3) Both | All | There are some variables affected by a spin-up issue. This affects just some ensemble members depending on the initial conditions each member started from. Unfortunately, as the selection of the forecast members is done randomly from a bigger pool of initial conditions, there is no metadata describing this in the current service based on GRIB files stored in ECMWF's MARS archive. D7. | DWD Hindcasts | All 2017 start dates | For this forecasting system, year 2017 start dates have been computed as hindcasts and not real-time forecasts. | D8. | CMCC | (system=3) Both | All | For this forecasting system, the evaporation field is masked over the ocean (only land points are available) | D9. | Met Office | (system=12,13) Both | All | The fractional land-sea mask doesn't match the masked (land-only or sea-only) fields. For the files affected, the land-sea mask provided was produced as the result of a 1-degree interpolation of the binary land-sea mask in the native model resolution | |
Data gaps
Note: (1) See description of nominal start dates here
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G6. | JMA | (system=3) Forecasts | 20220102 to | 20220111 No data is available. | JMA CPS3 started its operational production at JMA on the 12th January 2022 G7. | MetOffice | (system=601) Hindcasts | 20030417 | Due to a technical issue with the acquisition at ECMWF of MetOffice data, member 106 was incomplete. To fix this in the archive the data from one member from system 600 (same forecasting system) for this start date was used to substitute member 106 G8. | NCEP | (system=2) Forecasts | 20230522 | No data is available. G9. | MetOffice (system=602) Forecasts | 20230715 | Member 002 is missing. It will not be replaced. G10. | MetOffice (system=602) Forecasts | 20230808 | Ocean (monthly) data files are missing for both member 001 and 002. Due to a technical issue with the acquisition at ECMWF of MetOffice GloSea6 data, some data files have been lost and are not recoverable. This affects these two members, but only for the ocean monthly data, for everything else in the atmospheric datasets (daily, monthly and anomalies) and downstream products these two members are available. |
Data irregularities
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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 signed on 11/11/2014). 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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