Neutral Surfaces Calculation in python

COSIMA Ocean
21

Sorry to resurrect a dead thread, but we’ve had to remove this from the conda/analysis3 environment as of June 2026, as the release has been marked as broken on conda-forge. Probably this means it was historically broken (and so should be avoided), but if you do need it, environment versions prior to this should still contain it.

22

Hi Charles,
I just raised an issue about this on the environment GitHub page as I didn’t see your update before ([PACKAGE REQUEST] Add <pygamma_n> to analysis3 environment · Issue #423 · ACCESS-NRI/ACCESS-Analysis-Conda · GitHub). I’m using the pygamma_n a lot and there is also a COSIMA recipe on it, so I’m assuming many people do ( Neutral density — COSIMA Cookbook documentation ).

If this package is broken we should obviously not use it but calculating neutral density surfaces is a pain on python already so this package was a great solution, does anyone know of other options?

Cheers,
Ole

23

Ahhh, this is definitely going to be a problem then :melting_face:.

I’ll see if we can resolve this, but I’m not super confident due to the netcdf-fortran and MPI dependency issues that this introduces…

I’ll respond on the github issue from here onwards until there’s a fix just to try avoid generating a load of unhelpful noise.

❯ pixi add pygamma_n
Error:   × failed to solve requirements of environment 'analysis3' for platform 'linux-64'
  ├─▶   × failed to solve the environment
  │
  ╰─▶ Cannot solve the request because of: pygamma_n * cannot be installed because there are no viable options:
      └─ pygamma_n 1.1.1 | 1.1.1 | 1.1.1 | 1.1.1 | 1.1.1 | 1.1.2 | 1.1.2 | 1.1.2 | 1.1.2 would require
         └─ netcdf-fortran >=4.6.3,<4.7.0a0, which cannot be installed because there are no viable options:
            └─ netcdf-fortran 4.6.3 | 4.6.3 | 4.6.3 | 4.6.3 | 4.6.3 | 4.6.3 would require
               └─ libnetcdf * mpi_mpich_*, for which no candidates were found.