Failing to quantify on real CMIP6 data

[TomNicholas]

The example gist here, run on pangeo's cloud (staging - environment below), is an attempt to use pint-xarray with cf-xarray on some real CMIP6 data.

Unfortunately I think it fails to .quantify the lev dataarray properly:

• You can see the resultant DataArray's data is a numpy array instead of a pint Quantity.
• The units attribute is left on the DataArray, but I thought we were dropping those?
• It also doesn't recognise degrees_east, but I thought cf-xarray was supposed to add that?

I need to look into this more to work out what is actually going wrong...

Environment:

Output of mamba list

packages in environment at /srv/conda/envs/notebook: # # Name Version Build Channel _libgcc_mutex 0.1 conda_forge conda-forge _openmp_mutex 4.5 1_gnu conda-forge abseil-cpp 20210324.0 h9c3ff4c_0 conda-forge adal 1.2.7 pyhd8ed1ab_0 conda-forge adlfs 0.7.3 pyhd8ed1ab_1 conda-forge affine 2.3.0 py_0 conda-forge aiobotocore 1.3.0 pyhd8ed1ab_0 conda-forge aiohttp 3.7.4 py38h497a2fe_0 conda-forge aioitertools 0.7.1 pyhd8ed1ab_0 conda-forge alembic 1.5.8 pyhd8ed1ab_0 conda-forge alsa-lib 1.2.3 h516909a_0 conda-forge amqp 5.0.6 pyhd8ed1ab_0 conda-forge anyio 2.2.0 py38h578d9bd_0 conda-forge appdirs 1.4.4 pyh9f0ad1d_0 conda-forge argon2-cffi 20.1.0 py38h497a2fe_2 conda-forge arrow-cpp 3.0.0 py38hd6878d3_11_cpu conda-forge asciitree 0.3.3 py_2 conda-forge asn1crypto 1.4.0 pyh9f0ad1d_0 conda-forge astropy 4.2.1 py38h497a2fe_0 conda-forge async-timeout 3.0.1 py_1000 conda-forge async_generator 1.10 py_0 conda-forge atk-1.0 2.36.0 h3371d22_4 conda-forge attrs 20.3.0 pyhd3deb0d_0 conda-forge av 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[keewis]

if I understand correctly, lev is a dimension coordinate? To support those, pint-xarray will convert the string to a unit object and save that as a attribute (.pint.sel and other methods that use indexes use that to work around the no-units-on-indexes restriction).

I'm not sure why degrees_east does not work, could you check whether the unit registry at pint_xarray.unit_registry supports it? Otherwise you might have to update cf-xarray, you need cf-xarray>=0.6.0.

[dcherian]

I think you have to import cf_xarray.units

[keewis]

it's both, actually, the environment lists cf-xarray=0.5.1 and the import is import cf_xarray not import cf_xarray.units

[TomNicholas]

Thanks guys, those seem to have fixed my issues!