Downloading data for one selected pressure level.

[ChenyuDongNUS]

When I want to download data for one selected pressure level (full resolution), e.g. 850hPa uwind.
If I download the data in directory: weatherbench2/datasets/era5/1959-2022-full_37-1h-0p25deg-chunk-1.zarr-v2/u_component_of_wind
However, accessing this data results in downloading approximately 200 TB, which includes uwind data across 37 pressure levels.
Is there a way to download data for only selected pressure levels?
I apologize if this question seems trivial, and I appreciate any comment/guidance.
Thank you!

[SadeghTabas-NOAA]

@ChenyuDongNUS Please see below:

import xarray as xr
ds = xr.open_zarr('gs://weatherbench2/datasets/era5/1959-2023_01_10-wb13-6h-1440x721_with_derived_variables.zarr')
u_wind_850 = ds['u_component_of_wind'].sel(level=850)
u_wind_850.to_netcdf('your/save/directory.nc')
# or to save in zarr:
# u_wind_850.to_zarr('your/save/directory.zarr', mode='w')