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The planned timetable for the implementation of the cycle 50R1 is as follows:
| Date | Event |
|---|---|
| 12 May 2026 | Implementation |
The timetable represents current expectations and may change in light of actual progress made.
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- Updated background errors for NWP, now taken from the operational EDA (COMPO)
Updated background errors for O3 to remove spurious long-range correlations (COMPO) - The EDA-based B matrix used in 49r1 is tapered in the stratosphere for in 50r1 for CH4 (GHG)
- The EDA-based B matrix used in 49r1 is tapered near the surface in 50r1 for CO2 (GHG)
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- Update of heterogeneous chemistry parameterization
- Revision of SO2 + H2O2 aqueous phase reaction
Impact of the new cycle
Technical details of the new cycle
| Note |
|---|
Please note: With the implementation of the IFS Cycle 50r1 a subset of model levels forecast fields, listed below, is now available every hourly step at 0, 1, 2 ... 119 and 120. |
| paramId | shortName | name | units | GRIB edition | Components | Test data available |
|---|---|---|---|---|---|---|
Model levels | ||||||
| 130 | t | Temperature | K | 2 | yes | |
| 133 | q | Specific humidity | kg kg-1 | 2 | yes | |
152 | lnsp | Logarithm of surface pressure | ~ | 2 | yes | |
210001 | aermr01 | Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
210002 | aermr02 | Sea Salt Aerosol (0.5 - 5 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
210003 | aermr03 | Sea Salt Aerosol (5 - 20 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210004 | aermr04 | Dust Aerosol (0.03 - 0.55 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210005 | aermr05 | Dust Aerosol (0.55 - 0.9 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210006 | aermr06 | Dust Aerosol (0.9 - 20 um) Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210007 | aermr07 | Hydrophilic Organic Matter Aerosol Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210008 | aermr08 | Hydrophobic Organic Matter Aerosol Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210009 | aermr09 | Hydrophilic Black Carbon Aerosol Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210010 | aermr10 | Hydrophobic Black Carbon Aerosol Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210011 | aermr11 | Sulphate Aerosol Mixing Ratio | kg kg-1 | 2 | CAMS aerosol model | yes |
| 210121 | no2 | Nitrogen dioxide | kg kg-1 | 2 | CAMS chemistry model | yes |
| 210122 | so2 | Sulphur dioxide | kg kg-1 | 2 | CAMS chemistry model | yes |
| 210123 | co | Carbon monoxide | kg kg-1 | 2 | CAMS chemistry model | yes |
| 210124 | hcho | Formaldehyde | kg kg-1 | 2 | CAMS chemistry model | yes |
| 210203 | go3 | Ozone | kg kg-1 | 2 | CAMS chemistry model | yes |
| 215180 | aerext355 | Aerosol extinction coefficient at 355 nm | m-1 | 2 | CAMS aerosol model | yes |
| 217107 | glyoxal | Glyoxal | kg kg-1 | 2 | CAMS chemistry model | yes |
Change to GRIB encoding
The GRIB model identifiers (generating process identification number) for cycle 50r1 will be changed as follows:
GRIB 1 Section 1 Octets | GRIB 2 Section 4 Octets | ecCodes key | Component | Model identifier | |
|---|---|---|---|---|---|
49r1 | 50r1 | ||||
6 | 14 | generatingProcessIdentifier | Atmospheric model | 158 | 161 |
6 | 14 | generatingProcessIdentifier | Ocean wave model | 106 | 109 |
6 | 14 | generatingProcessIdentifier | soil moisture model | 146 | 146 |
For all parameters in GRIB 2 the Master Tables Version Number will be changed as follows:
GRIB 2 Section 1 Octets | ecCodes key | Master Tables Version Number | |
|---|---|---|---|
49r1 | 50r1 | ||
10 | tablesVersion | 33 | 35 |
Software
To handle the data of Cycle 50r1 we recommend to use the ECMWF software packages
ecCodes (2.44.0)
CodesUI (minimum version)
Magics (4.16.0)
Metview (5.26.1)
ODC (1.6.0)
On the ECMWF ATOS HPC these these versions correspond to ecmwf-toolbox/2025.1
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| Note | ||
|---|---|---|
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The CAMS operational ECMWF data portal (aux.ecmwf.int; SFTP/FTP/HTTPS data access) 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 05-2025 onwards directly on MARS, ECMWF dissemination or through the Atmosphere Data Store. More details can be found here: Accessing CAMS 50r1 test data. |
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