import xarray as xr

store = 'gs://cmip6/GFDL_CM2_6/control/surface'
ds = xr.open_dataset(store, engine='zarr', chunks={})

import xarray as xr

store = 'gs://cmip6/GFDL_CM2_6/control/atmos_daily.zarr'
ds = xr.open_dataset(store, engine='zarr', chunks={})