We are pleased to announce that a new dataset has been published today, September 2026, in the Climate Data Store (CDS):
This dataset is a post-processed version of the original CDS CERRA-Land sub-daily regional reanalysis data for Europe from 1984 to present dataset and is stored in Analysis Ready Cloud Optimised (ARCO) format, which has been implemented for retrieving long time-series for a single point in a efficient way.
To generate this CERRA-Land time-series for a selection of CERRA-Land variables dataset, homogenisation conventions have been applied to the CERRA-Land source GRIB data to ensure consistency, usability, and alignment across chosen variables and time steps. The processed data were then written to an ARCO Zarr archive , enabling efficient cloud-optimised access and scalable data retrieval. Please refer to the user guide for details.
This dataset offers:
- interactive access to the data files using the CERRA-Land time-series Download form
- programmatic access to the data files using CDS API service
- programmatic access to the full CERRA-Land without downloading individual files (analysis-ready Zarr stores) - please refer to instructions provided on the new Analysis Ready Data tab. Please note that this is a Beta service . Data Store Service administrators reserve the right to take the necessary actions at any moment, including closing access to maintain the overall performance of the Data Store Service.
In relation to the new CERRA-Land time-series data, a NEW “Analysis ready data” tab is now available in the original CERRA-Land sub-daily regional reanalysis data for Europe from 1984 to present data entry. This tab provides instructions including code snippet showing how to open a Zarr store (using xarray) containing the geo-chunked and time-chunked CERRA-Land data:
For any enquiries regarding this dataset, please contact us (ECMWF login required).
ECMWF Support