[MITgcm-support] HELP: mitgcm tide

[Martin Losch]

Daquan,

personally I don’t have too much experience with tides in the context of the MITgcm, but this is what I would do:

look for examples with tides or gravity waves included: e.g. verification/internal_wave or on MITgcm_contrib you can find a few examples, eg. <http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/input> contains tidal forcing, as far as I know. Then use these examples to select relevant parameters (time stepping, etc.)

KPP and internal tide mixing: the so-called background diffusivity is meant to roughly parameterise (tidal) mixing. This parameter is always set in “data” (diffKrT and diffKrS, viscAr) and KPP does not reset it.

Martin

> On 4. Feb 2019, at 07:56, Daquan Guo <Daquan.Guo at kaust.edu.sa> wrote:
> 
> Hi, 
> 
> I am working on a regional circulation simulation with MITgcm and found that cases with and without tides show a big difference. 
> 
> I am wondering if someone has experience that when including the tides into the model, what kind of parameters should be modified accordingly, such as viscosity, diffusivity parameters?
> 
> Also as l leaned from the MITgcm mannual, the KPP scheme is using a constant value to estimate the mixing caused by internal waves. In my opinion, when adding tides into the model, this term should be reduced because the baroclinic tides could account for most of the internal waves, but I could find where to modify this term. Does anyone konw how to deal with it when adding tides? 
> 
> Daquan
> 
> 
> 
> 
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