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Public access to this dataset will be closed on June 1st, 2023. For more information and possible alternatives, please consult the dedicated page on Decommissioning of ECMWF Public Datasets service. |
ERA-40 is a global reanalysis dataset covering the period from September 1957 to August 2002.
The atmospheric model used for ERA-40 is known as IFS CY23r4. A comprehensive documentation about the ECMWF forecasting system (the code of which has been developed jointly with Météo-France.) can be found on the ECMWF website at https://www.ecmwf.int/en/publications/ifs-documentation
ERA-40 had the following resolution:
- 60 levels in the vertical;
- T159 spherical-harmonic representation for basic dynamical fields;
- a reduced Gaussian grid with approximately uniform 125km spacing for surface and other grid-point fields.
The atmospheric model was coupled to an ocean-wave model which resolved 25 wave frequencies and 12 wave directions at the nodes of its 1.5° grid.
The ERA-40 data assimilation and forecast suite produced:
- four analyses per day, for 00, 06, 12, and 18 UTC;
- two forecasts per day to 6 hours ahead, from 06 and 18 UTC;
- two forecasts per day to 36 hours ahead, from 00 and 12 UTC;
In addition, forecasts have been subsequently run to ten days ahead from 00 and 12 UTC.
ERA-40 generated supported datasets, archived in ECMWF’s Meteorological Archive and Retrieval System (MARS). The data comprises:
- observations;
- analysis and forecast fields from the assimilating atmospheric model at full resolution;
- analysis and forecast fields from the atmospheric model evaluated at standard pressure levels;
- analysis and forecast fields from the atmospheric model evaluated on isentropic and PV = ± 2 surfaces;
- analysis and forecast fields from the coupled ocean-wave model on its regular 1.5° x1.5° latitude/longitude grid;
- monthly means, variances and covariances;
- feedback from the data assimilation for each observation supplied to it;
- selected diagnostic and derived data.
References
Kållberg, P., A. Simmons, S. Uppala, and M. Fuentes, 2007: ERA-40 Project Report Series, 17. The ERA-40 Archive, 31pp, https://www.ecmwf.int/node/10595
Some ERA-40 references available from the ECMWF website.
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