ECMWF re-analysis

The ECMWF reanalysis project is a meteorological reanalysis project.

The first reanalysis product, , generated reanalyses for approximately 15 years, from December 1978 to February 1994. The second product, ERA-40 (originally intended as a 40-year reanalysis) begins in 1957 (the International Geophysical Year) and covers 45 years to 2002. As a precursor to a revised extended reanalysis product to replace ERA-40, ECMWF released , which covers the period from 1979 to 2019. A new reanalysis product has recently been released by ECMWF as part of Copernicus Climate Change Services. This product has higher spatial resolution (31 km) and covers the period from 1979 to present. Extension up to 1950 will become available in 2020.^[1]

In addition to reanalysing all the old data using a consistent system, the reanalyses also make use of much archived data that was not available to the original analyses. This allows for the correction of many historical hand-drawn maps where the estimation of features was common in areas of data sparsity. The ability is also present to create new maps of atmosphere levels that were not commonly used until more recent times.

Accessing the data[]

The ECMWF re-analysis products are accessible from the Climate Change Services homepage.^[2] The data can be downloaded for research use from ECMWF's homepage (see external links) and the National Center for Atmospheric Research data archives. Both require registration. A Python web API can be used to download a subset of parameters for a selected region and time period.

See also[]

• NCEP/NCAR Reanalysis - NCEP/NCAR reanalyses

References[]

• Uppala, S. M.; KÅllberg, P. W.; et al. (2005). "The ERA-40 re-analysis". Q. J. R. Meteorol. Soc. 131 (612): 2961–3012. doi:10.1256/qj.04.176.

External links[]

• ERA5 Reanalysis Product
• ERA-Interim project
• ERA-40 project
• ERA-15 project
• Global Wave Discovery Ends 220-Year Search-article describing the use of ERA5 to identify an atmospheric wave predicted 220 years earlier by Pierre-Simon Laplace

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