Review calc_zostoga implementation

[rbeucher]

Requesting review of the current calc_zostoga implementation.

Unsure whether the calculation is correct or consistent with CMIP expectations.

[dougiesquire]

Could you link the code please?

[rbeucher]

Sure sorry:
https://github.com/ACCESS-NRI/ACCESS-MOPPy/pull/182/changes#diff-11cb94a5443e31423ff5e7e940e1fb1451f2deb5de3a15e7dd5571e8968247b1R80

[rbeucher]

Or try via that link https://github.com/ACCESS-NRI/ACCESS-MOPPy/pull/182/changes#r2786225188