ECMWF is planning to introduce a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) real-time data assimilation and forecasting system on 18 May 2021.
This upgrade is mostly a technical upgrade but also includes a limited set of scientific corrections to the prescribed emission data sets that feed into the forecasting system. The main technical change is the switch to running the forecasts (but not the analyses) using single-precision arithmetic for increased computational efficiency. Resolution and data formats remain the same. The CAMS upgrade also benefits from the meteorological changes that are part of the overall ECMWF cycle upgrade, which for this cycle consist of the change to single precision. More information can be found at https://confluence.ecmwf.int/display/COPSRV/Implementation+of+IFS+cycle+47r2.
The new system has been running for some months now and the CAMS Validation teams are assessing the output to ensure the quality of the analyses and forecasts. The main changes relate to the improved emissions treatment. A full overview of all the changes and their impact can be found on the page mentioned above. The validation report will become available from the CAMS web site as soon as the assessment has been finalised.
Users wanting to access the output from the current test system can access the data from 1 November 2020 onwards directly on MARS or through our WebAPI as described here: https://confluence.ecmwf.int/display/COPSRV/Accessing+CAMS+47r2+test+data. However, please note that only the data after 5 January 2021 are based on the latest configuration.
For users who are registered to our operational FTP server, we are providing daily global test data in the CAMS_GLOBAL_TEST and CAMS_EUROPE_BC_TEST directories. In addition, surface level fields (model level 137) are provided as individual files in the CAMS_GLOBAL_ADDITIONAL_TEST directory. The most recent 3 days of test data are available in these directories on any given day.
We recommend you watch this announcement as we will update this page when the upgrade will have been implemented.
For feedback or any questions about the above, please contact us.
Your sincerely,
ECMWF Support
