Significant upgrade resulting with a minor change when regridding some CDS datasets stored in ECMWF MARS

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Following a significant software and hardware upgrade on April 30, 2024, some CDS users may notice some very small differences (compared to data previously downloaded) in GRIB field values for a handful of parameters and only when data is regridded (using the “grid” keyword via their API request).

To be clear, the small differences are not scientifically relevant .

The datasets made available from the Climate Data Store (CDS) which may be impacted are those hosted on the CDS/‘MARS internal’ and on ‘MARS external’.

Users downloading the above mentioned datasets using the CDS web interface (Download form) to download the data are not concerned with this announcement.

ECMWF Support
on behalf of the CDS Team

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