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The ARCO data is stored as Zarr datacubes to provide efficient access to time-chunked and geo-chunked ERA5 single level hourly data:
| Variable set (Item) | Chunking strategy (Asset) | URL for Zarr datacube |
|---|---|---|
Pressure levels (Table 1) | Geo-chunked | https://arco.datastores.ecmwf.int/cadl-arco-geo-048/arco/reanalysis_era5_pressure_levels/pl/geoChunked.zarr |
| Time-chunked | https://arco.datastores.ecmwf.int/cadl-arco-time-048/arco/reanalysis_era5_pressure_levels/pl/timeChunked.zarr |
| Info | ||
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Access to ARCO data is programmatic; therefore, users of these resources and this documentation are expected to have some relevant programming experience. |
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The ERA5 time-series data on pressure levels from 1940 to present catalogue entry allows users to download long time series for a single-point or limited area via the CDS download webform or a CDS API request that users can build from the webform. The data download via the time-series entry is as described below with additional aspects:
Note Please be aware when you select a "Location" on the form, the latitude and longitude values are rounded to the closest neighborhood point of the 0.25 degrees grid. Similarly, selecting an “Area” returns all points within the region defined by the nearest neighborhood corner points to the user-specified S, W, N, and E latitude/longitude values (maximum 5° x 5°).
- The download form allows users to select a choice of netCDF or CSV. The conversion is done directly with xarray with no additional processing from the Zarr description above.
- Given the computational cost of writing to csv, users are limited to smaller downloads with this option.
- The surface and single level parameters (Table 1) and the wave parameters (Table 2) are in different Zarr stores, therefore they will be served in different output files.
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The entry may be temporarily disabled or completely deprecated at any point and it does not come with the same level of operational support as the parent entry. Additionally, the formats and structure of the data files are subject to change. |
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Table 1: pressure levels parameters
| Name | Units | Variable name | Notes | |
|---|---|---|---|---|
| 1 | Geopotential | m2 s-2 | geopotential | |
| 2 | Specific humidity | kg kg-1 | specific_humidity | |
| 3 | Temperature | K | temperature | |
| 4 | U component of wind | m s-1 | u_component_of_wind | |
| 5 | V component of wind | m s-1 | v_component_of_wind | |
| 6 | Vertical velocity | Pa s-1 | vertical_velocity |
Known issues
Please refer to the ERA5 documentation.
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