based on https://gitlab.dkrz.de/mipdata/zarr-in-swift-objectstorage/-/blob/master/notebooks/compare_zarr_netcdf.ipynb but with tzis
this can be added to the https://gitlab.dkrz.de/mipdata/python_package_zarr_in_swift/-/blob/master/notebooks/use-case_zarr-access-from-swift_xarray-intake_cmip6.ipynb