As per ECMWF's official website documentation, the variable name should be referenced as z and not zs. This is indicated in the reference link: (https://codes.ecmwf.int/grib/param-db/?id=129). However, it's observed that both in the repository (https://github.com/google-research/arco-era5/blob/main/raw/era5_ml_zs.cfg) and within the storage bucket(gs://gcp-public-data-arco-era5/raw/ERA5GRIB/HRES/Month/**) where the data is stored, the variable name is currently set as zs. To ensure consistency, an update is required in this regard.
As per ECMWF's official website documentation, the variable name should be referenced as
zand notzs. This is indicated in the reference link: (https://codes.ecmwf.int/grib/param-db/?id=129). However, it's observed that both in therepository(https://github.com/google-research/arco-era5/blob/main/raw/era5_ml_zs.cfg) and within thestorage bucket(gs://gcp-public-data-arco-era5/raw/ERA5GRIB/HRES/Month/**) where the data is stored, the variable name is currently set aszs. To ensure consistency, an update is required in this regard.