[MITgcm-support] Problem with MNC masking of ice shelf diagnostics

[Edward W Doddridge]

Hi Kaitlin,

Thanks for taking the time to report this, and to track down what you think is causing it. The code base has recently moved to a repository on GitHub<https://github.com/MITgcm/MITgcm> and we’d like to start using the issue tracker there for dealing with bug reports - and discussing how to fix them. One advantage of using the GitHub issue tracker is that you can easily link to bits of code in the issue, and eventually the pull request that implements a fix can also link with the original issue.

If you’re willing to open an issue there, that’d be great.

Cheers,
Ed


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Edward Doddridge
Postdoctoral researcher
Earth, Atmospheric and Planetary Sciences
Massachusetts Institute of Technology

www.doddridge.me<http://www.doddridge.me>

On 8 May 2018, at 09:50, Naughten, Kaitlin A. <kaight at bas.ac.uk<mailto:kaight at bas.ac.uk>> wrote:

Hello,

I'm writing to report a small bug in the MNC masking option (useMissingValue in data.diagnostics). When I switch this option on, ice shelf diagnostics (SHIfwFlx, SHIhtFlx, SHIuStar) are incorrectly masked. The entire ice shelf is masked out, with only the open ocean (where these variables are zero) unmasked.

In the subroutine diagnostics_mnc_out, it looks like maskC is applied at klev=1, since the ice shelf variables have already been compressed into a 2D array. But in fact this 2D array represents all different values of klev, none of which are 1 beneath the ice shelf.

I'm not sure of the most efficient way to solve this problem, as I'm not very familiar with the code base yet, so I thought I'd report it here before I tried to fix it myself! If someone sees an obvious solution, I'm happy to implement it.

Many thanks,
Kaitlin Naughten
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