error from netCDF in cf.write

Bắt đầu với cfdm/read_write/netcdf/netcdfwrite.py tại _write_global_attributes và lệnh gọi netCDF4 Dataset.setncattr được hiển thị trong traceback. Tái hiện cf.write trong môi trường Python được báo cáo và xác định thuộc tính toàn cục nào chứa các ký tự thay thế không hợp lệ. Công việc được xem là hoàn tất khi dữ liệu bị ảnh hưởng có thể được ghi mà không gặp UnicodeEncodeError và hành vi này được bao phủ bởi một regression test phù hợp.

I am processing some CMIP6 data on Jasmin (making time-means). I get the following error. I realise that you probably need more background to diagnose it, but perhaps it's obvious from this much information? As a result of the error, the file is not properly written, just the start of it.

Thanks. Jonathan

Traceback (most recent call last):
  File "/home/users/jonathan/bin/grouptime", line 97, in <module>
    cf.write(n,ofile)
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.12/mf3-25.3.0-3/envs/jaspy3.12-mf3-25.3.0-3-v20250704/lib/python3.12/site-packages/cfdm/read_write/write.py", line 826, in __new__
    netcdf.write(
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.12/mf3-25.3.0-3/envs/jaspy3.12-mf3-25.3.0-3-v20250704/lib/python3.12/site-packages/cfdm/decorators.py", line 171, in verbose_override_wrapper
    return method_with_verbose_kwarg(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.12/mf3-25.3.0-3/envs/jaspy3.12-mf3-25.3.0-3-v20250704/lib/python3.12/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 5232, in write
    self._file_io_iteration(
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.12/mf3-25.3.0-3/envs/jaspy3.12-mf3-25.3.0-3-v20250704/lib/python3.12/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 5478, in _file_io_iteration
    self._write_global_attributes(fields)
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.12/mf3-25.3.0-3/envs/jaspy3.12-mf3-25.3.0-3-v20250704/lib/python3.12/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 4610, in _write_global_attributes
    g["netcdf"].setncattr(
  File "src/netCDF4/_netCDF4.pyx", line 3087, in netCDF4._netCDF4.Dataset.setncattr
  File "src/netCDF4/_netCDF4.pyx", line 1858, in netCDF4._netCDF4._set_att
  File "src/netCDF4/_netCDF4.pyx", line 6733, in netCDF4._netCDF4._strencode
UnicodeEncodeError: 'utf-8' codec can't encode characters in position 61-63: surrogates not allowed