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

[Menemenlis, Dimitris (US 329B)]

Hi Josephine, would you by any chance have sea ice entering or exiting your domain?  Sea ice lateral fluxes would not be included in TOTTEND.

Dimitris Menemenlis
818-625-6498

On Sep 17, 2024, at 9:15 AM, Josephine Anselin - BAS <joslin53 at bas.ac.uk> wrote:


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<https://urldefense.us/v3/__https://mitgcm.org/download/daily_snapshot/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf__;!!PvBDto6Hs4WbVuu7!KF_zBQLnOlt1MolinKrV4tXovMauCTPoVUwB5SsQNc40LpaVGixzCmrmMV2UUGZHAgtYAwjB0Eiul4alXunzGNgbNnaKIMY$>
(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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