[MITgcm-support] [mitgcm-support] Questions about modification of heat budget

[Martin Losch]

Hi,
I am not if I am getting this right, but “hflux” is the net upward heat flux including the shortwave heat flux. So it does not matter, what size swflux (the upward shortwave heat flux, i.e. “light”), because the model is driven by hflux. swflux is only used when shortwave radiation is meant to penetrate the ocean, e.g. for KPP, in which case the heat flux is partitioned between hflux-swflux (applied at the surface) and swflux (allowed to penetrate the ocean a little). Have a look at EXF_FIELDS.h for a definition of the fields

So if you think that you surface heat flux is the problem, then you have to make sure that mean over time and space of hflux = 0. I suspect (as you do) that your open boundaries are also important. There is no code to balance the fluxes there, but you can estimate the heat flux by computing c_p*rho*theta*(normal velocity) at the boundary (so what you specify).

Martin

> On 18. Jun 2017, at 16:27, liuyi315 <liuyi315 at mails.ucas.ac.cn> wrote:
> 
> Dear all users,
> 
> I am trying to do a regional ocean modeling using MITgcm, and I have encountered a problem about heat budget. The heat forcing in my simulation includes "hfluxfile" and "swfluxfile" in data.exf, and the climatological nudging of SST is also used. 
> 
> When I compared my outputs with observed data, I found the temperature around the thermocline is much higher than obs. data (about 3 degree). I have calculated the surface net heat flux from the forcing file and found that the value of swflux is larger than hfluxfile, which means that there always exists extra heat input into the ocean. I think that's the main reason why the thermocline temperature is much higher than observed data.
> 
> I believe that I need modify the heat forcing file "hfluxfile" and "swfluxfile" to balance the heat budget. But we all know the heat budget includes not only sea surface but the heat transport in the boundary is also very important. Thus, how could I calculate the heat transport from each boundary and how can I modify it?
> 
> Any suggestions are welcome, thanks!  
> 
> Best regards,
> 
> Yi Liu
> 
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