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The IFS undergoes changes regularly in order to improve the forecast. Changes are listed below with their identifier (Cycle 46r1 for instance) or a specific title when the cycle number did not change.
| Implementation date | Cycle | Summary of changes | Resolution/Resolution change | New species |
|---|---|---|---|---|
| 12 November 2024 | 49r1 | Horizontal: 40km, Vertical: 137 levels | none | |
| 27 June 2023 | 48r1 | Horizontal: 40km, Vertical: 137 levels | See parameters in green in tables below | |
| 1 Feb 2023 | 47r3 | Assimilation of AOD from VIIRS | none | |
| 15 Dec 2022 | 47r3 | Update of the T159 background error covariance wavelet file to use the correct NWP background errors. The update leads to considerably improved NWP forecast scores. As a consequence, smaller changes to AOD and upper tropospheric and lower stratospheric ozone are also expected. | Horizontal: 40km, Vertical: 137 levels | none |
| 22 Feb 2022 | 47r3 | A fix of low-level T/q in fog conditions was introduced with the 12 UTC cycle on 22 Feb 2022 | Horizontal: 40km, Vertical: 137 levels | none |
| 12 October 2021 | 47r3 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 137 levels | none |
| 18 May 2021 (12UTC cycle) | 47r2 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 137 levels | none |
| 6 October 2020 | 47r1 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 137 levels | none |
| 9 July 2019 | 46r1 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: from 60 to 137 levels | Aerosols: nitrate and ammonium |
| 26 June 2018 | 45r1 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 60 levels | See Table 1 and 2 |
| 26 September 2017 | 43r3 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 60 levels | none |
| 24 January 2017 | 43r1 | Atmospheric composition, Meteorology | Horizontal: 40km, Vertical: 60 levels | none |
| 21 June 2016 | 41r1 | Atmospheric composition, Meteorology | Horizontal: from 80km to 40km, Vertical: 60 levels | none |
Data access
The data is now available from the Atmosphere Data Store (ADS), either interactively through its download web form or programmatically using the CDS API service:
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| Issue type | Description | Cycle | Note |
|---|---|---|---|
| Time-integrated deposition fluxes for chemical species have zero values | The time-integrated dry and wet deposition fluxes for chemical species (expect except ozone) with GRIB codes starting with 222 and 223 have zero values for all the times. These fields have data start from June 2023. | 48r1 | |
| High SO2 values over north-eastern Brazil | High SO2 values over north-eastern Brazil on 18 January 2020 and 16 June 2020 at 06:00:00 are artificial and are due to the assimilation of some spurious satellite observations of SO2 in one of the datasets used by CAMS. | 47r1 | |
| BC concentrations in the mid/upper troposphere tend to be too high | Some of the low background BC concentrations in the mid/upper troposphere tend to be too high as an artefact of the data assimilation as it improves the total AOD. (They're still very low compared to polluted areas, but can be somewhat higher than they should.) This aspect of the impact of data assimilation on aerosol speciation is something that we're continuing to look into. (The accompanying "control run", a model-only product with no AOD assimilation, can often has a more realistic speciation and vertical profile in this regard, but at the cost of a poorer agreement with observations of total AOD.) | 47r1 or 46r1 | |
Dust emissions are too high in cycle 46r1 | See details here: Dust emissions are too high in Cycle 46r1 | 46r1 | |
AOD and PM data are zero at forecast step 0 | Aerosol optical depth (AOD) and particulate matter (PM10, PM2.5) at forecast step 0: all values are zero | 41r1 and 43r1 |
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