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
Surface and single level (Table 1)	Time-chunked	https://arco.datastores.ecmwf.int/cadl-arco-time-002/arco/reanalysis_era5_single_levels/sfc/timeChunked.zarr
Wave (Table 2)	Geo-chunked	https://arco.datastores.ecmwf.int/cadl-arco-geo-003/arco/reanalysis_era5_single_levels/wav/geoChunked.zarr
Wave (Table 2)	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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	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	10m wind gust since previous post-processing	m s^-1	10m_wind_gust_since_previous_post_processing
6	2 metre dewpoint temperature	K	2m_dewpoint_temperature
7	2 metre temperature	K	2m_temperature
8	Mean sea level pressure	Pa	mean_sea_level_pressure
9	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.
10	Skin temperature	K	skin_temperature
11	Surface pressure	Pa	surface_pressure
12	Surface latent heat flux	J m^-2	surface_latent_heat_flux
13	Surface sensible heat flux	J m^-2	surface_sensible_heat_flux
14	Surface solar radiation downwards	J m^-2	surface_solar_radiation_downwards
15	Surface thermal radiation downwards	J m^-2	surface_thermal_radiation_downwards
16	Total precipitation	m	total_precipitation
17	Total cloud cover	(0 - 1)	total_cloud_cover
18	Total sky direct solar radiation at surface	J m^-2	total_sky_direct_solar_radiation_at_surface
19	Cloud base height	m	cloud_base_height
20	Boundary layer height	m	boundary_layer_height

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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