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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.
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<div dir="ltr">Dimitris Menemenlis
<div>818-625-6498</div>
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<blockquote type="cite">On Sep 17, 2024, at 9:15 AM, Josephine Anselin - BAS <joslin53@bas.ac.uk> wrote:<br>
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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The following parameter settings are used:<o:p></o:p></p>
<p class="MsoNormal">implicitFreeSurface=.TRUE.<o:p></o:p></p>
<p class="MsoNormal">nonlinFreeSurf=4.<o:p></o:p></p>
<p class="MsoNormal">useRealFreshWaterFlux=.FALSE.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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:<o:p></o:p></p>
<p class="MsoNormal">TOTTEND/86400 = Adv_tend + Dif_tend,<o:p></o:p></p>
<p class="MsoNormal">with Adv_tend and Dif_tend calculated as per page 3 in this document:
<a href="https://urldefense.us/v3/__https://mitgcm.org/download/daily_snapshot/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf__;!!PvBDto6Hs4WbVuu7!KF_zBQLnOlt1MolinKrV4tXovMauCTPoVUwB5SsQNc40LpaVGixzCmrmMV2UUGZHAgtYAwjB0Eiul4alXunzGNgbNnaKIMY$">
https://mitgcm.org/download/daily_snapshot/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf</a>
<o:p></o:p></p>
<p class="MsoNormal">(KPPg_TH and oceQsw are zero in the model configuration).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, the heat budget does not close using this calculation.
<o:p></o:p></p>
<p class="MsoNormal">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.
<o:p></o:p></p>
<p class="MsoNormal">Is there a diagnostics analogous to TRELAX but for lateral heat flux instead of surface heat flux?<o:p></o:p></p>
<p class="MsoNormal">If not, does anyone have any suggestions on how this could be calculated using built-in diagnostics?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you<o:p></o:p></p>
<p class="MsoNormal">Josephine</p>
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