This dataset presented here is a subset of some parameters of the full CDS ERA5-Land single levels hourly dataset on 0.1 degrees resolution and is stored in Analysis Ready Cloud Optimised (ARCO) format, which has been implemented for retrieving long time-series for a single point in an efficient way.

Methodology

Excerpt

The process to generate this dataset involves:

Fetching ERA5-Land data in GRIB format.
Apply homogenization conventions, as applicable:
- Rename spatial coordinates to latitude, longitude.
- Ensure latitude, longitude ranges are between [-90, +90], [-180, +180].
- If the number of hourly samples is incomplete (less than 24) the date is skipped (e.g. 1950-01-01).
- Time is expressed in one single dimension called time, which in ERA5-Land netCDFs is usually called valid_time.
- Drop "number", "step", "surface", "valid_time" and "depthBelowLandLayer".
- The accumulation variables (e.g. Total precipitation) are de-accumulated to hourly resolution. Please see the Jupyter notebook below.
Written to an ARCO Zarr archive (which is similar in structure to netCDF).
The CDS requests the data from the Zarr archive using xarray and writes the data to netCDF or CSV (as requested).

Jupyter notebook demonstrating the procedure to de-accumulate the data

...

	Name	Units	Variable name	Notes	Group
1	2 metre temperature	K	2m_temperature		2m temperature
2	2 metre dewpoint temperature	K	2m_dewpoint_temperature		2m temperature
3	Total precipitation	m	total_precipitation	De-accumulated	Pressure and precipitation
4	Surface pressure	Pa	surface_pressure		Pressure and precipitation
5	10 metre V wind component	m s**-1	10m_v_component_of_wind		Wind
6	10 metre U wind component	m s**-1	10m_u_component_of_wind		Wind
7	Surface solar radiation downwards	J m**-2	surface_solar_radiation_downwards	De-accumulated	Radiation and heat
8	Surface thermal radiation downwards	J m**-2	surface_thermal_radiation_downwards	De-accumulated	Radiation and heat
9	Volumetric soil water layer 1	m3 m-3	volumetric_soil_water_layer_1		Soil water
10	Volumetric soil water layer 2	m3 m-3	volumetric_soil_water_layer_2		Soil water
11	Volumetric soil water layer 3	m3 m-3	volumetric_soil_water_layer_3		Soil water
12	Volumetric soil water layer 4	m3 m-3	volumetric_soil_water_layer_4		Soil water
13	Skin Temperature	K	skin_temperature		Skin temperature
14	Soil temperature level 1	K	soil_temperature_level_1		Soil temperature
15	Soil temperature level 2	K	soil_temperature_level_2		Soil temperature
16	Soil temperature level 3	K	soil_temperature_level_3		Soil temperature
17	Soil temperature level 4	K	soil_temperature_level_4		Soil temperature
18	Snow cover	%	snow_cover		Snow
19	Snow depth	m	snow_depth		Snow

...