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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 mass burden (mass), and the addition of two new aerosol species (anthropogenic and biogenic secondary organic aerosol). In addition, 4 four 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.
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- 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
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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
The GRIB model identifiers (generating process identification number) for cycle 48r1 will be changed as follows:
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