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The CAMS IFS cycle 48R1 is based on ECMWF's IFS cycle 48R1 . This is a major upgrade with various scientific contributions. Key elements are the 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 burden (mass), and the addition of two new aerosol species (anthropogenic and biogenic secondary aerosol). In addition, 4 new species have been added to the tropospheric chemistry scheme, and prescribed emissions have been updated to more recent versions. In terms of technical changes, there is an important change to the GRIB encoding. More information can be found below.
The page will be updated as required. It was last changed on 19 25 April 2023.
For a record of changes made to this page please refer to Document versions .
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- Activation of assimilation of Sentinel-5p/TropOMI CO retrievals
- AOD from VIIRS (activated already in 47r3 1.2.2023)
- Passive monitoring of IASI SO2 retrievals
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- Activation of stratosphere chemistry using the BASCOE scheme - adding 63 reactive gas species
- New tropospheric species: HCN, CH3CN, Glyoxal and Glycoladehyde
- Improved isoprene oxidation simulation
- Update of dry deposition formulation for reactive gases
- Two new secondary organic aerosol tracers (anthropogenic and biogenic) and respective precursor gas tracers
- Major update of dust emissions and removal simulation (resulting in a redistribution of dust aerosol towards larger particles with an increase in the global dust mass burden by a factor of 2 as a result)
- Review of aerosol optical properties (dust , brown carbon)
- Improved secondary inorganic aerosol simulation
- Use of COMADH advection for aerosols, reactive gases and GHG
Impact of the new cycle
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A comprehensive evaluation report of the 48r1 e-suite, documenting all the changes and their impact on the forecasts, is in preparation and will be provided before the implementation date. Based on the evaluation of the testing of all individual changes and the preliminary evaluation of the final e-suite, the following aspects for key species should be noted:
- New aerosol species added (anthropogenic and biogenic secondary organic aerosol)
- New tropospheric chemical species added (HCN, CH3CN, Glyoxal and Glycoladehyde)
- Comprehensive stratospheric chemistry added (including 63 species)
- Stratospheric ozone (O3): improvement in lower stratosphere with slight degradation in tropical upper stratosphere
- Stratospheric nitrogen dioxide (NO2): significant improvement due to more comprehensive chemistry
- Tropospheric ozone (O3): generally neutral with positive impact in south-east Asia
- Tropospheric nitrogen dioxide (NO2): generally small improvement, which is more pronounced for south-east Asia
- Tropospheric sulfur dioxide (SO2): generally small improvement, which is more pronounced for south-east Asia
- Tropospheric carbon monoxide (CO): generally small improvement, which is more pronounced for south-east Asia
- UV: no major change
- Aerosol Optical Depth (AOD): no major change
- Dust aerosol: significant change in size distribution resulting in more larger particles
Technical details of the new cycle
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Several of the upgrades in CY48R1 have resulted in new parameters, some of which will be added to the dissemination through the Atmosphere Data Store (ADS) and the ECPDS ftp server. For now, the main new parameters are listed in the table below. Others might be added based on user requests.
| paramId | shortName | name | units | GRIB edition | Components | Test data available |
|---|---|---|---|---|---|---|
Model levels | ||||||
| 210252 | aermr19 | Biogenic secondary organic aerosol mass mixing ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210253 | aermr20 | Anthropogenic secondary organic aerosol mass mixing ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| glyoxal | Glyoxal | kg kg-1 | 2 | CAMS chemistry model | yes | |
| Pressure levels | ||||||
| 210252 | aermr19 | Biogenic secondary organic aerosol mass mixing ratio | kg kg-1 | 1 | CAMS aerosol model | yes |
| 210253 | aermr20 | Anthropogenic secondary organic aerosol mass mixing ratio | kg kg-1 | 1 | CAMS aerosol model | yes |
| 217107 | glyoxal | Glyoxal | kg kg-1 | 1 | CAMS chemistry model | yes |
Surface level | ||||||
| 215226 | soaod550 | Secondary organic aerosol optical depth at 550 nm | dimensionless | 1 | CAMS aerosol model | yes |
| 218107 | tc_glyoxal | Total column of glyoxal | kg m-2 | 1 | CAMS chemistry model | yes |
Change to GRIB encoding
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| Date | Reason for update |
|---|---|
| 16 February 2023 | Initial version |
| 29 March 2023 | Detailed list of changes and expected implementation date |
| 19 April 2023 | Added table with new parameters |
| 25 April | Update of Impact section |