[Mitgcm-support] Why are some variables in COMMON when they are only used once

[mitgcm-support at dev.mitgcm.org]

Common blocks are used to force otherwise local variables
into global storage. This allows multi-threaded exchange operations
to work.

If you don't want multi-threaded parallelism then you can remove the
common block.

Patrick Heimbach wrote:
> 
> Jean-Michel,
> 
> in calc_exact_eta the field hDivFlow is declared
> in a common block.
> However, that common block is - I think-  nowhere else needed.
> Furthermore, TAF gets totally confused by it, I have no clue, why.
> Can I just remove the common block?
> 
> P.
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