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The page will be updated as required. It was last changed on 2 September 202123 February 2022.
For a record of changes made to this page please refer to Document versions .
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Date | Event |
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TBC | Announcement of expected implementation date |
12 Oct 2021 | Implementation |
22 Feb 2022 | A fix of low-level T/q in fog conditions was introduced with the 12 UTC cycle on 22 Feb 2022. |
The timetable represents current expectations and may change in light of actual progress made.
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- Updated aerosol dry deposition based on Zhang & He (2014)
- Updated aerosol wet deposition based on Luo et al. (2019)
Impact of the new cycle
For most compounds, the quality of the e-suite is very comparable to the o-suite. A substantial decrease in sulphate aerosol optical depth and an increase in sea salt aerosol optical depth are observed in the e-suite compared to the o-suite, and biases in aerosol properties (optical depth and size distribution) have improved. The impact of the assimilation of NO2 seems to be rather modest, and the performance of e-suite and o-suite is therefore similar. For CO the NDACC comparisons indicate increased negative biases and decreased correlations for high latitudes in the Northern Hemisphere, while other observations show little change. There are some indications that the upgrade of moist physics and related changes in convection influence the tracer distributions (e.g., CO profiles).
In summary, two improvements and a small degradation are reported for the e-suite compared to the o-suite. No major degradation was observed for any specific species or region. The scorecard below summarises the results. 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, is available from the CAMS website.
Technical details of the new cycle
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There are no new or discontinued parameters in the disseminated data compared to 47r2.
Software
Change to GRIB encoding
As for the IFS Cycye 47r3 upgrade, the Master Tables Version Number for all parameters in GRIB 2 will be changed as follows:
GRIB 2 Section 1 Octets | ecCodes key | Master Tables Version Number | |
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47r2 | 47r3 | ||
10 | tablesVersion | 5 | 27 28 from March 2022 |
All users are encouraged to check their data processing with the test data provided.
Software
To ecCodes version 2.22.1 or later is required to handle the full range of parameters from this cycle. In fact, it is recommended to use , in particular the changed parameter names listed in the table below, ecCodes version 2.23.0 or later for decoding 22.1 is required as a minimum. In fact, for the decoding of all data generated by IFS cycle Cycle 47r3.In particular, ecCodes version 2.2223.1 or later will be required to properly decode the names of the parameters in the table below (which have changed):0 or later is recommended.
paramId | old name | new name |
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210203 | GEMS Ozone | Ozone mass mixing ratio (full chemistry scheme) |
211203 | GEMS Ozone | Ozone mass mixing ratio difference (full chemistry scheme) |
210123 | Carbon monoxide | Carbon monoxide mass mixing ratio |
211123 | Carbon monoxide | Carbon monoxide mass mixing ratio difference |
210121 | Nitrogen dioxide | Nitrogen dioxide mass mixing ratio |
211121 | Nitrogen dioxide | Nitrogen dioxide mass mixing ratio difference |
210122 | Sulphur dioxide | Sulphur dioxide mass mixing ratio |
211122 | Sulphur dioxide | Sulphur dioxide mass mixing ratio difference |
217019 | Ammonia | Ammonia mass mixing ratio |
217027 | Nitrogen monoxide | Nitrogen monoxide mass mixing ratio |
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Date | Reason for update |
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1 July 2021 | Initial version |
9 July 2021 | ecCodes version requirement noted |
20 August 2021 | Access to test data |
2 September 2021 | Implementation date postpone by 1 week to 12 October 2021 |
4 October 2021 | Recommendation to use ecCodes version 2.23.0 with cycle 47r3 and highlight of a change in the GRIB 2 encoding |
11 October 2021 | Main conclusions from external evaluation of the upgrade |
23 February | Implementation of a fix of low-level T/q in fog conditions |