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The page will be updated as required. It was last changed on 16th June 23rd September 2020.
For a record of changes made to this page please refer to Document versions .
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The planned timetable for the implementation of the cycle 46r1 47r1 is as follows:
| Date | Event |
|---|---|
| TBC13 July 2020 | Announcement of expected implementation date |
| TBC6 October 2020 | Implementation |
The timetable represents current expectations and may change in light of actual progress made.
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IFS cycle 47r1 is going through its final testing preparation phase.
Meteorological content of the new cycle
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- Hybrid Linear Ozone (HLO) scheme (a Cariolle-type linear parameterisation of stratospheric ozone chemistry using the multi-year mean of the CAMS reanalysis as mean state) .
- New sea-salt emission scheme based on Albert et al. (2016), providing better agreement with measured sea-salt size distribution.
- Updated dust source function, reducing excess dust in the Sahara, Middle East and other regions, and restoring missing dust over Australia.
- Revised coefficients in UV processor, based on ATLAS3 spectrum.
Impact of the new cycle
A comprehensive evaluation report of the 47r1 e-suite has been prepared documenting all the changes and their impact on the forecasts. Noteworthy improvements w.r.t to the current o-suite cycle
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46r1 are:
- strongly reduced stratospheric ozone bias (10-20 hPa range) because of the HLO ozone scheme
- strongly reduced positive SO2 surface bias, especially during night time, in Europe and North-America because of the introduction of injection heights for SO2 emissions
- increased fine and ultra fine mode sea-salt and reduced corse mode sea-salt because of the new sea-salt emissions scheme
- increased surface PM2.5 leading to improvements over Europe
- reduced positive dust biases in desert-affected regions, which also reduce overestimation of PM10
Technical details of the new cycle
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Availability of test data from the cycle 47r1 test suites
To be completedThe 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 October 2019 onwards directly on MARS or through our WebAPI. More details can be found here: https://confluence.ecmwf.int/display/COPSRV/Accessing+CAMS+47r1+test+data.
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| Date | Reason for update |
|---|---|
| 20 April 2019 | Initial version |
| 13 July 2020 | Updated with latest information before public announcement |
| 23 September 2020 | Updated with latest information |
| 3 October 2020 | Link to EQC report added |