[MITgcm-support] Qnet and Qsw heat fluxes after ceckpointc54

[quentin jamet]

Hi Martin,

Thank you for this precision abou heat fluxes. Things are clearer now.

cheers,

Quentin

---------------------
Quentin Jamet
'*Le vent nous pousse toujours, il s'agit de savoir dans quel sens!*'


2013/6/18 Martin Losch <Martin.Losch at awi.de>

> Hi Qentin,
>
> the model variable Qnet is really the net heat flux. If you have a closer
> look at the code that you copied from external_forcing_surf.F, you'll
> realize that Qsw is actually subtracted (and not added) from Qnet (because
> Qsw can penetrate water, it will be added later and distributed over more
> than just the surface layer).
>
> If you want shortwave heat to penetrate into the ocean, you need to
> specify a qswfile, independtly of using the surfQnetFile or the obsolete
> surfQfile.
>
> Martin
>
> On Jun 18, 2013, at 12:29 PM, quentin jamet <quentinjamett at gmail.com>
> wrote:
>
> > Hi all,
> >
> > I am running a forced ocean model on the CS-grid shape at low resolution.
> > I have questioning about heat fluxes.
> > When looking at the definition of Qnet (surface net heat flux) in
> FFIELD.h, I can read :
> > Qnet = latent + sensible + net longwave + net shortwave
> >
> > So I concluded that shortwave heating has to be included into the
> QnetFile.
> > This is coherent with external_fields_load.F where Qsw data are added to
> Q data to obtain Qnet data.
> > So if I directly prescribe a QnetFile, it is the same that prescribing a
> Qfile and a QswFile.
> > But in external_forcing_surf.F, Qsw is also added to Qnet :
> >
> > C     Net heat flux Qnet:
> >           surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj)
> >      &       - ( Qnet(i,j,bi,bj)
> > #ifdef SHORTWAVE_HEATING
> >      &          -Qsw(i,j,bi,bj)
> > #endif
> >      &         ) *recip_Cp*mass2rUnit
> >
> > I so wonder which file do I have to prescibe to obtain a total heat flux
> containing shortwave heating?
> >
> > Thanks in advance
> >
> > ---------------------
> > Quentin Jamet
> > 'Le vent nous pousse toujours, il s'agit de savoir dans quel sens!'
> > _______________________________________________
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> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
>
>
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