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The issue described here has not been fixed yet. It is kept here for information only. |
What's wrong?
In November 2018, an error was reported An error has been detected affecting the following data :
- Snowfall amount from CMCC-CM2-v20160423 (CMCC SPSv3) data
- Affects all data from monthly and daily CDS catalogue entries
- Start dates:
- all November start dates both for hindcasts from 1993 to 2016 and 2018 real-time forecast
- all December start dates for hindcasts from 1993 to 2016
- Start dates:
- It also affects monthly anomalies CDS catalogue entry
- Start dates: 2018-11-01
- Affects all data from monthly and daily CDS catalogue entries
This error has been caused by a bug in one of CMCC's postprocessing tools, and its outcome was to produce values equal to zero of daily snowfall amount in places where the snowfall was below a given threshold.
This error has not been fixed yet, this means that:
in the climate data store (CDS):
| CDS Dataset | ERA5 hourly data on pressure levels from 1979 to present |
|---|---|
| Parameters affected | U-component of wind, V-component of wind |
| Level | All pressure levels |
| Time periods affected | 01 Jan. 2000 - 31 Dec. 2008 01 Jun. 2018 - present |
This problem was caused by the computation of U/V from Vorticity (Vo) and Divergence (D) already interpolated on a regular grid in CDS. U/V should have been computed from Vo and D in spherical harmonics representation (the native model representation) and then interpolated to a regular grid before saving to the Climate Data Store.
What can I do if I downloaded the wrong data?
Because this error has not yet been fixed, this means that any data corresponding to the description above is totally
...
wrong, and will continue to be wrong until a fix is in place
...
. You should not use this data and wait until the problem is fixed.
This issue was fixed in January 2019.
When will the issue be fixed?
It is estimated the problem will be fixed in January 2019. Exact details of when the problem is fixed will be provided on this page.
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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