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Fields are in monthly files with one variable per file. Files are compressed with a deflate level of 6 and chunked to the grid dimension. Please note that as 07-04-03-2021 all months in the database from 202101 up to 202102 are considered ERA5T202101 are the final version of ERA5.
Please note that even if the output of sst and siconc is available hourly from CDS API, it only change one time a day, so it was downloaded only at 12Z.
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