ECMWF implemented a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on Tuesday 27 June 2023.
Key elements are:
- Addition of full stratospheric chemistry,
- Changes to the modelling of dust aerosol resulting in a redistribution of aerosol particles towards larger sizes and therefore a significant increase in global dust mass burden
- Addition of two new aerosol species (anthropogenic and biogenic secondary organic aerosol).
- Four new species have been added to the tropospheric chemistry scheme,
- Prescribed emissions have been updated to more recent versions.
The CAMS Global atmospheric composition forecast data documentation has been updated accordingly.
In terms of technical changes, there is an important change to the GRIB encoding. This is the introduction of the Golomb-Rice coding compression method, as defined in the CCSDS recommended standard and implemented by the Adaptive Entropy Coding Library (AEC), as the default packing type for all gridded model output in GRIB 2 format.
For any questions or to report any issues with this model upgrade, please contact us using our ECMWF Support Portal.
Regards,
ECMWF Support
1 Comment
Xiaobo Yang
For information: You can change the 'packingType' using ECMWF's ecCodes if you prefer:
# CCSDS -> simple
grib_set -r -s packingType=grid_simple in.grib2 out.grib
# Simple -> CCSDS
grib_set -r -s packingType=grid_ccsds in.grib out.grib2