Hi all, Has anyone ever attempted to compute the heatbudget offline from T, u,v and w? Is there a standard approach to this in MOM when the individual heat budget terms haven’t been saved? Specifically, I’m looking to compute the mixed layer heat budget (as is done in many marine heatwave studies)…

@ChrisC28 Did you get anywhere with this? I haven’t done it. However, I am currently working on doing the mixed layer temperature budget properly using online binning of the MOM5 heat budget diagnostics into the mixed layer (code is working, I’m slowly writing it up…). For comparison purposes, I ha…

Hi @adele-morrison and @rmholmes Apologies for my slow response. Long story… Essentially I’m trying to do a mixed layer heat budget from the BRAN2020. I have u,v,T, w and mld at daily output intervals. I’ve very, very carefully tried to calculated the advective terms following a finite-volume ap…

How are you computing surface fluxes, SW penetration, vertical mixing and entrainment? Depending on your application, these could be just as large or larger than advection and thus be causing you issues.

Thanks Ryan, I should have been more clear in exactly what I’m trying to accomplish. I’m trying to compute the mixed layer heat budget point-wise offline from daily average output. The output I have is MLD, total surface heat flux, u,v,w, and T. BRAN2020 is based on MOM5 on a 0.1x0.1 degree B-gri…

[image] ChrisC28: In the region I working in (the EAC) I expect the advective terms to dominate. I’m not convinced by this. Here is an example for a single month in the North Atlantic from a precise (online) computation in ACCESS-OM2-025. Advection is not obviously dominant in the Gulf Stream…

Sorry for the incredibly slow reply on this, but seems there’s still some interest ( @sb4233 just poked me). I dug up what I did on this 10 years ago. This is the depth-integrated meridional heat flux averaged over one year in CM2.6 (whose ocean component is fairly equivalent to ACCESS-OM2-01), comp…

I also recall not having much luck using u and v. Much better to use uhrho_et and vhrho_nt, which are on the mid-edges of the tracer cells rather than the corners.

Thanks for sharing @adele-morrison ! Does any of the ACCESS-OM2 runs include uhrho_et , vhrho_nt , and wrho_bt ? Also do you remember which ppm_hlimiter you used in your code ?

Okay let me put my use case here - I’m working on performing a Reynolds decomposition of the advective tendency, aiming to isolate terms such as ū ∂T′/∂x, u′ ∂T̄/∂x etc where the overbar denotes the mean and the prime denotes the deviation from the mean. In the model, advective tendencies are com…

Offline heat budget

COSIMA

adele-morrison (Adele Morrison) 22 October 2024 09:06 2

Do you mean just the advection terms? We’ve successfully reproduced those offline from 5-day average (or daily) outputs of T, u, v, w.

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Offline heat budget

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