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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 | Chunking strategy |
|---|
| URL for Zarr datacube | ||
|---|---|---|
Surface and single level (Table 1) | Geo-chunked | https://arco.datastores.ecmwf.int/cadl-arco-geo-002/arco/reanalysis_era5_single_levels/sfc/geoChunked.zarr |
| Time-chunked | https://arco.datastores.ecmwf.int/cadl-arco-time-002/arco/reanalysis_era5_single_levels/sfc/timeChunked.zarr | |
Wave (Table 2) | Geo-chunked | |
| Time-chunked | https://arco.datastores.ecmwf.int/cadl-arco-time-003/arco/reanalysis_era5_single_levels/wav/timeChunked.zarr |
The variables available in the Single levels atmospheric and Wave Zarr files are listed in Table 1 and Table 2, respectively.
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import xarray as xr # Geo-chunked data for access optimised along the time dimension (e.g. for time-series at a single point) # Surface surface_geo_url = "https://arco.datastores.ecmwf.int/cadl-arco-geo-002/arco/reanalysis_era5_single_levels/sfc/geoChunked.zarr" # Wave wave_geo_url = "https://arco.datastores.ecmwf.int/cadl-arco-geo-003/arco/reanalysis_era5_single_levels/wav/geoChunked.zarr" # Time-chunked data for access optimised along the timespace dimension (e.g. for short-time-series atperiod afor singlelarge pointareas) # Surface surface_time_url = "https://arco.datastores.ecmwf.int/cadl-arco-time-002/arco/reanalysis_era5_single_levels/sfc/timeChunked.zarr" # Wave wave_time_url = "https://arco.datastores.ecmwf.int/cadl-arco-time-003/arco/reanalysis_era5_single_levels/wav/timeChunked.zarr" # Open one of the Zarr objects with xarray, the default example opens the geo-chunked surface variables ds = xr.open_zarr( surface_geo_url, consolidated=True, storage_options={ "headers": {"Authorization": f"Bearer <CDS-API-KEY>"} } ) # Inspect the variables print(ds) |
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| Name | Units | Variable name | Notes | |
|---|---|---|---|---|
| 1 | 10 metre U wind component | m s-1 | 10m_u_component_of_wind | |
| 2 | 100 metre V wind component | m s-1 | 10m_v_component_of_wind | |
| 3 | 10 metre U wind component | m s-1 | 100m_u_component_of_wind | |
| 4 | 100 metre V wind component | m s-1 | 100m_v_component_of_wind | |
| 5 | 2 metre dewpoint temperature | K | 2m_dewpoint_temperature | |
| 6 | 2 metre temperature | K | 2m_temperature | |
| 7 | Mean sea level pressure | Pa | mean_sea_level_pressure | |
| 8 | Sea surface temperature | K | sea_surface_temperature | Sea surface temperature is available at the usual times, eg hourly, but its content is only updated once daily. |
| 9 | Skin temperature | K | skin_temperature | |
| 10 | Surface pressure | Pa | surface_pressure | |
| 11 | Surface solar radiation downwards | J m**-2 | surface_solar_radiation_downwards | |
| 12 | Surface thermal radiation downwards | J m**-2 | surface_thermal_radiation_downwards | |
| 13 | Total precipitation | m | total_precipitation | |
| 14 | Total cloud cover | (0 - 1) | total_cloud_cover | |
| 15 | Cloud base height | m | cloud_base_height | |
| 16 | Boundary layer height | m | boundary_layer_height |
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Table 2: wave parameters: instantaneous
| Count | Name | Units | Variable name |
|---|---|---|---|
1 | Mean wave direction | Degrees | mean_wave_direction |
| 2 | Mean wave period | s | mean_wave_period |
| 3 | Significant height of combined wind waves and swell | m | significant_height_of_combined_wind_waves_and_swell |
Known issues
Please refer to the ERA5 documentation.
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