Timely updates are provided and consolidated in an official release about two months behind real time, while preliminary updates are available with a latency of less than a week.
A second phase of ERA5, a pre-extension back to 1950, is currently in production and is to be available by the fall of 2019.
ERA5 is based on a recent ECMWF model cycle which uses the 4D-Var assimilation method for the atmosphere, and includes coupling with ocean waves and a land model.
Radiative forcing follows the evolution of greenhouse gases, volcanic eruptions, ozone and aerosols as recommended by CMIP5 and a consistent
reconstruction is used for sea-surface temperature and sea ice.
A number of reprocessed data records are ingested as well as several data sets that have never been re-used before, and ERA5 is able to assimilate the latest instruments.
Bias correction schemes have been extended and improved.
ERA5 is produced at considerably higher resolution than ERA-Interim: hourly analysis fields are available at a horizontal resolution of 31 km on 137 levels in the vertical.
ERA5 data products also include information about uncertainties which is provided by a lower-resolution 10-member 4D-Var ensemble.
A number of new parameters, such as 100-metre wind speed and direction, are available as part of the output. A database containing all ingested observations, together with detailed information about how they are used, is available to users.
In addition, a dedicated ERA5 land component delivers a land-surface product at an enhanced resolution.