Description of upgrade
The CAMS IFS cycle 47R3 is based on ECMWF's IFS cycle 47R3 . This is a minor upgrade with a limited set of scientific contributions.
The page will be updated as required. It was last changed on 1 July 2021.
For a record of changes made to this page please refer to Document versions .
Further information and advice regarding the upgrade can be obtained from the Copernicus User Support.
Timetable for implementation
The planned timetable for the implementation of the cycle 47r2 is as follows:
| Date | Event |
|---|---|
| TBC | Announcement of expected implementation date |
| 5 Oct 2021 | Implementation |
The timetable represents current expectations and may change in light of actual progress made.
Current Status
IFS cycle 47r3 is going through its final preparation phase.
Meteorological content of the new cycle
The meteorological changes can be found on the ECMWF IFS CY47R3 page.
The main change which impacts CAMS is the switch to running the forecasts (but not the analysis) using single-precision arithmetic for increased computational efficiency.
Atmospheric composition content of the new cycle
Assimilation
- Introduction of linear chemistry for NOx in minimization (tangent linear and adjoint code)
Observations
- Introduction of Sentinel-5p NO2
Emissions
Other model changes
Impact of the new cycle
A comprehensive evaluation report of the 47r3 e-suite will be made available closer to the implementation date, documenting all the changes and their impact on the forecasts.
Technical details of the new cycle
New and discontinued parameters
There are no new or discontinued parameters in the disseminated data compared to 47r1.
Software
Availability of test data from the cycle 47r2 test suites
The CAMS operational FTP server (ECPDS) currently serves the most recent 3 days of test data 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) are provided as individual files in the 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 November 2020 onwards directly on MARS or through our WebAPI. However, please note that only the data after 5 January 2021 are based on the latest configuration. More details can be found here: Accessing CAMS 47r2 test data.
Document versions
| Date | Reason for update |
|---|---|
| 1 July 2021 | Initial version |