# CAMS Model CY48R1 successfully upgraded on 27 June 2023

**URL:** <https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299>\
**Category:** CAMS - Announcements\
**Tags:** cams, ifs, cams\_global\_forecast\
**Created:** [5 May 2023 14:23 UTC](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299 "2023-05-05T14:23:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anabelle](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/anabelle/32/360_2.png) [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\
**Post date:** [5 May 2023 14:23 UTC](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299/1 "2023-05-05T14:23:02Z")

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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**.  
 &nbsp;  
 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&nbsp;[CAMS Global atmospheric composition forecast data documentation](https://confluence.ecmwf.int/display/CKB/CAMS%3A+Global+atmospheric+composition+forecast+data+documentation) has been updated accordingly.

In terms of technical changes, there is an&nbsp; **important change to the GRIB encoding**. This is the introduction of&nbsp;the Golomb-Rice coding compression method, as defined in the CCSDS recommended standard and implemented by the Adaptive Entropy Coding Library ([AEC](https://gitlab.dkrz.de/k202009/libaec/-/blob/master/README.md)), 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&nbsp;[ECMWF Support Portal](https://confluence.ecmwf.int/category/cd).&nbsp;&nbsp;

Regards,&nbsp;

ECMWF Support

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<div class="post-metadata">

**Author:** ![Xiaobo\_Yang](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/x/e495f1/32.png) [@Xiaobo\_Yang](https://forum.ecmwf.int/u/Xiaobo_Yang)\
**Post date:** [28 June 2023 09:08 UTC](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299/2 "2023-06-28T09:08:36Z")

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For information: You can change the 'packingType' using ECMWF's [ecCodes](https://confluence.ecmwf.int/display/ECC) 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_