xgcm attrs causing problems when saving to netcdf?

[nmalan]

Hi all,

Great package! In migrating some of my workflow across from home-cooked xarray/xgcm to xroms, I have come across an issue with saving a dataset opened with xroms.open_mfnetcdf to netcdf.

When I run ds.isel(ocean_time=0).to_netcdf('filename.nc')

I get the following error to do with attributes associated with the grid object:

`TypeError: Invalid value for attr 'grid': X Axis (not periodic, boundary=None):

• center xi_rho --> inner
• inner xi_u --> center Y Axis (not periodic, boundary=None):
• center eta_rho --> inner
• inner eta_v --> center Z Axis (not periodic, boundary=None):
• center s_rho --> outer
• outer s_w --> center. For serialization to netCDF files, its value must be of one of the following types: str, Number, ndarray, number, list, tuple`

Has anyone else encountered this behaviour? Unfortunately I was not able to access the files used in the example notebook, so this may be a function of my particular ROMS dataset.

[claudiofgcardoso]

Hi,

I had the same issue. The problem is related with the attribute 'grid' that is added to the xr.Dataset after xroms processing, which cannot be saved to a netCDF. Before you export your xr.Dataset "ds", you have to delete the 'grid' attribute in ds as follows: del varout.attrs['grid']

[nmalan]

Thanks @claudiofgcardoso! I thought it might have been something like that, but think I was trying to delete the wrong attributes. I will give it a try.