[MITgcm-devel] BLING

[Ariane Verdy]

Hi,

We have checked in the BLING code (mitgcm_contrib/bling) and a verification example (mitgcm_contrib/verification_other/global_oce_biogeo_bling). If anyone uses it or glances at the code, we could certainly appreciate your feedback!

One thing in particular that needs attention is a small piece of code that we'd like to hide from TAF. In the bling_production subroutine, there is an option to get rid of negative tracer concentrations using the BLING_NO_NEG flag, analogous to DIC_NO_NEG in the dic package. We find this makes the code much more stable and thus is highly desirable. However it causes numerous adjoint recomputations, and the only way I found to get rid of those recomputations is with several store commands, some of which are inside loops, which ends up slowing down the code more than the recomputations themselves. (Furthermore, I don't think we want this NO_NEG bit adjointed as it is likely ill-posed.) We could probably hide this bit of code outside of the BLING package (e.g. in autodiff pkg), but that is not ideal. So my question is: can someone please suggest a good way to hide a bit of code from TAF within the BLING package?

Thank you,
Ariane