[MITgcm-support] A query about EXF

[Abhisek Chakraborty]

Dear Dimitris Menemenlis,

Thanks for your prompt reply.

I understand that for the default configuration of EXF I need to use
ustress, vstress (from 10m winds) and hflux, swflux and sflux.  However, I
don't have any fluxes (e.g. shortwave or long wave, precipitaion etc.)
other than HS and HL.  In such a scenario, I can compute hflux as the sum
of HS and HL. But what I should do for the other fluxes (swflux, sflux
etc.). Should I use some climatology or simply zero?

regards,
Abhisek


On Thu, Oct 10, 2013 at 10:07 AM, Menemenlis, Dimitris (3248) <
Dimitris.Menemenlis at jpl.nasa.gov> wrote:

> Hi Abhisek, you are correct.
> The table shows you the various combinations of surface forcings
> that you can use and the flags that you need to set.
> In your case you need to pay attention to
> C hflux :: Net upward surface heat flux including shortwave in W/m^2
> C          hflux = latent + sensible + lwflux + swflux
> C          > 0 for decrease in theta (ocean cooling)
>
> The model does not make a distinction between HS and HL.
> You will have to add them together, and to shortwave and
> longwave also, if you want to use.
>
> Dimitris Menemenlis
>
> > On 10/09/2013 06:55 PM, Abhisek Chakraborty wrote:
> > Dear Dimitris Menemenlis,
>
> >
> > I am using 63m version of the model and and the EXF_OPTIONS.h (e.g.
> > "global_with_exf") shows a table like the following one:
> >
> > c    WIND |TEMP |DOWN |BULK |EVAP |            actions
> > c    -----|-----|-----|-----|-----|-------------------------------------
> > c         |     |     |     |     |
> > c      -  |  -  |  -  |  -  |  -  | Read-in ustress, vstress, hflux,
> > c         |     |     |     |     | swflux, and sflux.
> > c         |     |     |     |     |
> > c     def | def | def | def |  -  | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swdown, lwdown, precip, and runoff.
> > c         |     |     |     |     | Compute ustress, vstress, hflux,
> > c         |     |     |     |     | swflux, and sflux.
> > c         |     |     |     |     |
> > c     def | def |  -  | def |  -  | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swflux, lwflux, precip, and runoff.
> > c         |     |     |     |     | Compute ustress, vstress, hflux,
> > c         |     |     |     |     | and sflux.
> > c         |     |     |     |     |
> > c     def |  -  |  -  | def |  -  | Read-in uwind, vwind, hflux,
> > c         |     |     |     |     | swflux, and sflux.
> > c         |     |     |     |     | Compute ustress and vstress.
> > c         |     |     |     |     |
> > c      -  | def |  -  | def |  -  | Read-in ustress, vstress, atemp,
> > c         |     |     |     |     | aqh, swflux, lwflux, precip, and
> > c         |     |     |     |     | runoff.  Compute hflux and sflux.
> > c         |     |     |     |     |
> > c     def | def |  -  |  -  | def | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swflux, lwflux, precip, runoff,
> > c         |     |     |     |     | and evap.
> > c         |     |     |     |     |
> > c     def | def |  -  | def |  -  | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swflux, lwflux, precip, and runoff.
> > c         |     |     |     |     | Compute open-water ustress, vstress,
> > c         |     |     |     |     | hflux, swflux, and evap.
> > c         |     |     |     |     |
> > c     def | def | def |  -  | def | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swdown, lwdown, precip, runoff,
> > c         |     |     |     |     | and evap.
> > c         |     |     |     |     |
> > c     def | def | def | def |  -  | Read-in uwind, vwind, atemp, aqh,
> > c         |     |     |     |     | swdown, lwdown, precip, and runoff.
> > c         |     |     |     |     | Compute open-water ustress, vstress,
> > c         |     |     |     |     | hflux, swflux, and evap.
> >
> >
> > Here I didn't find how to use hs and hl as inputs to EXF.
> >
> >  (As far as I understand, EXF is using the above parameters to compute
> > mainly wind stresses and sensible as well as latent heat fluxes. SO
> > THERE MUST BE SOME MEANS TO USE UWIND, VWIND, HS AND HL DIRECTLY IN THE
> > EXF PACKAGE).
> >
> > Any suggestion .....
> >
> > regards,
> > Abhisek
>
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