[MITgcm-support] Baylor Fox-Kemper parametrization in the MITgcm

[Suneet Dwivedi]

Thanks Baylor for these instructions and your help.

On Sat, Feb 21, 2015 at 6:57 PM, Baylor Fox-Kemper <baylor at brown.edu> wrote:

> Hi Suneet,
>   From an MITgcm simulation that is already set up, you need to confirm
> that the gmredi package is being used.  Then, to use the submesoscale
> parameterization, you need to add the contrib package:
>
>  http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/submesoscale
>
> You will want to add those files to your code directory, which will
> replace the ones in the standard gmredi package.
>
> The key parameters are:
>
> GM_SM_Ce
> GM_SM_Lf
> GM_SM_Lmax
> GM_SM_tau
>
> They will be set to the default values by gmredi_readparms.F, the lines of
> which are reproduced here:
>
> CBFK Submesoscale Paramters
> 93C GM_SM_Ce is the efficiency factor. Nondimensional, typically 0.06
> 94C Will be converted to a dimensional factor later
> 95C Set to zero to kill Submeso at runtime.
> 96 GM_SM_Ce = 0.06 _d 0
> 97C GM_SM_Lf is the minimum Front Width scale. Typically 1-10km
> 98 GM_SM_Lf = 5.00 _d 3
> 99C GM_SM_Lmax is the maximum upscale. Typically 100km
> 100 GM_SM_Lmax = 1.00 _d 5
> 101C GM_SM_tau is the momentum mixing timescale: 1/d to 1/week
> 102 GM_SM_tau = 8.64 _d 4
> 103C Will be converted to an inverse squared timescale later
>
> If you want to set up with MLE vs. control run, then the easiest way to do
> it at runtime is to specify GM_SM_Ce = 0.0 _d 0 in the namelist rather
> than GM_SM_Ce = 0.06 _d 0, which is the standard value.
>
> Note that if your standard run is not already using gmredi (e.g., if your
> simulation is mesoscale, but not submesoscale, resolving), then when you
> turn on that package you must be careful to set the standard (mesoscale) GM
> coefficients to zero.  If you are already using gmredi, then there is no
> change to those settings needed.
>
> The paper describing the parameterization essentially as it is implemented
> is here:  http://dx.doi.org/10.1016/j.ocemod.2010.09.002
>   Cheers,
>    -Baylor
>
>
> On Sat, Feb 21, 2015 at 7:37 AM, Suneet Dwivedi <suneetdwivedi at gmail.com>
> wrote:
> >
> > Dear Baylor,
> >
> > Hope you are doing fine. Could you please suggest me on how to implement
> the Baylor Fox-Kemper MLE parametrization scheme in the MITgcm? I shall be
> very thankful to you. I wish to perform sensitivity studies in the northern
> Indian ocean by using this parametrization.
> >
> > With best regards,
> >
> > Suneet
>
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