Rule build_cutout

Create cutouts with atlite.

For this rule to work you must have

• installed the Copernicus Climate Data Store cdsapi package (install with `pip`) and

• registered and setup your CDS API key as described on their website. The CDS API allows an automatic filedownload by executing this script

See also

For details on the weather data read the atlite documentation. If you need help specifically for creating cutouts the corresponding section in the atlite documentation should be helpful.

Relevant Settings

atlite:
    nprocesses:
    cutouts:
        {cutout}:

See also

Documentation of the configuration file config.yaml at atlite

Inputs

None

Outputs

• cutouts/{cutout}: weather data from either the ERA5 reanalysis weather dataset or SARAH-2 satellite-based historic weather data with the following structure:

ERA5 cutout:

Field	Dimensions	Unit	Description
pressure	time, y, x	Pa	Surface pressure
temperature	time, y, x	K	Air temperature 2 meters above the surface.
soil temperature	time, y, x	K	Soil temperature between 1 meters and 3 meters depth (layer 4).
influx_toa	time, y, x	Wm**-2	Top of Earth’s atmosphere TOA incident solar radiation
influx_direct	time, y, x	Wm**-2	Total sky direct solar radiation at surface
runoff	time, y, x	m	Runoff (volume per area)
roughness	y, x	m	Forecast surface roughness (roughness length)
height	y, x	m	Surface elevation above sea level
albedo	time, y, x	–	Albedo measure of diffuse reflection of solar radiation. Calculated from relation between surface solar radiation downwards (Jm**-2) and surface net solar radiation (Jm**-2). Takes values between 0 and 1.
influx_diffuse	time, y, x	Wm**-2	Diffuse solar radiation at surface. Surface solar radiation downwards minus direct solar radiation.
wnd100m	time, y, x	ms**-1	Wind speeds at 100 meters (regardless of direction)

A SARAH-2 cutout can be used to amend the fields temperature, influx_toa, influx_direct, albedo, influx_diffuse of ERA5 using satellite-based radiation observations.

Description