Description of upgrade
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 significant increase in global dust burden, and the addition of two new aerosol species (anthropogenic and biogenic secondary aerosol). In terms of technical changes, there is an important change to the GRIB encoding. More information can be found below.
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Timetable for implementation
The planned timetable for the implementation of the cycle 47r3 is as follows:
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The timetable represents current expectations and may change in light of actual progress made
Current Status
IFS cycle 48r1 is going through its final preparation phase.
Meteorological content of the new cycle
The meteorological changes can be found on the ECMWF IFS CY48R1 page.
Atmospheric composition content of the new cycle
Assimilation
- Instrument specific bias correction for AOD
- Data assimilation for separate volcanic SO2 tracer (optional)
- Enable modification Nitrate and Ammonium aerosols by data assimilation (bugfix)
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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 (increase in the global dust burden by factor 2)
- 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
For most compounds, the quality of the e-suite is ...
A comprehensive evaluation report of the 48r1 e-suite, documenting all the changes and their impact on the forecasts, will be provided before the implementation date.
Technical details of the new cycle
New and discontinued parameters
There are many several new parameters, TBC.
Change to GRIB encoding
The GRIB model identifiers (generating process identification number) for cycle 48r1 will be changed as follows:
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grib_ls -n statistics ccsds.grib grid_simple.gribSoftware
TBC
Availability of test data from the cycle 48r1 test suites
The CAMS operational FTP server (ECPDS) will serve the most recent 3 days of test data, once the e-suite is running in near-real-time, in the directories "/DATA/CAMS_GLOBAL_TEST" and "/DATA/CAMS_EUROPE_BC_TEST" for global and regional boundary condition data, respectively. In addition, surface level fields (model level 137) will be provided as individual files in the "/DATA/CAMS_GLOBAL_ADDITIONAL_TEST" directory. Users wanting to access the output from the current test system for a longer period can access the data from 1 September 2022 onwards directly on MARS or through. More details can be found here: Accessing CAMS 48r1 test data.
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| Date | Reason for update |
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| 16 February 2023 | Initial version |
| 29 March 2023 | Detailed list of changes and expected implementation date |
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