[MITgcm-support] Lateral heat flux due to temperature restoring

[Josephine Anselin - BAS]

Hi everyone,

I am evaluating the heat budget in a 3D domain with nx=640 grid points in the x-direction; ny=1200 grid points in the y-direction and nz=150 grid points in the z direction. The domain includes open ocean, ice shelf and grounded ice cells. Temperature and salinity are restored at the open lateral boundaries.

The following parameter settings are used:
implicitFreeSurface=.TRUE.
nonlinFreeSurf=4.
useRealFreshWaterFlux=.FALSE.

To begin with, I am trying to close the budget for the cells away from the ice shelf-ocean interface and away from the ocean surface. I was assuming that for these cells, the heat budget should be:
TOTTEND/86400 = Adv_tend + Dif_tend,
with Adv_tend and Dif_tend calculated as per page 3 in this document: https://mitgcm.org/download/daily_snapshot/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf
(KPPg_TH and oceQsw are zero in the model configuration).

However, the heat budget does not close using this calculation.
I would like to investigate the potential impact of the lateral heat flux due to temperature restoring to check if this might be causing the large residual.
Is there a diagnostics analogous to TRELAX but for lateral heat flux instead of surface heat flux?
If not, does anyone have any suggestions on how this could be calculated using built-in diagnostics?

Thank you
Josephine


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