[MITgcm-support] SST relaxation with temporal variability

[Martin Losch]

Yes,

except that the relaxation time scale only affects the surface restoring fields (files thetaClimFile, saltClimFile), but I think you mean that.

M.

> On 26. Mar 2018, at 18:53, Uchida Takaya <tu2140 at columbia.edu> wrote:
> 
> Hi Martin,
> 
> Thank you very much for your reply and information.
> 
> If I understand correctly what you have mentioned, as long as the forcing data (e.g. `zonalWindFile`, `thetaClimeFile` etc.) all have the same relaxation time scale, cycle and period, the time varying surface forcing should work fine with just prescribing the forcing files along with the `tauThetaClimRelax`, `externForcingCycle` and `externForcingPeriod` parameters in the namelist file `data` without having to resort to the `rbcs` nor `exf` package. Is this understanding correct?
> 
> Best,
> Takaya
> 
>> On Mar 26, 2018, at 4:37 AM, Martin Losch <Martin.Losch at awi.de> wrote:
>> 
>> Hi Takaya,
>> 
>> `externForcingCycle` and `externForcingPeriod` are used for all forcing data that is specified in the namelist file “data”. That makes this way of reading and applying forcing data very unflexible.
>> 
>> You could use the rbcs package for surface restoring, although I would not recommend it as it’s a bit of an overkill. rbcs can be used for 3D restoring and involves a lot of extra storage.
>> 
>> The recommended surface forcing package is the exf-package. There you have different forcing periods etc for each forcing field, including surface restoring. The exf-package is more involved in terms of configuration, but in the long run it pays off to use it.
>> 
>> Martin
>> 
>>> On 20. Mar 2018, at 20:28, Uchida Takaya <tu2140 at columbia.edu> wrote:
>>> 
>>> Dear MITgcm support,
>>> 
>>> 
>>> I am trying to include sea-surface temperature (SST) relaxation with temporal variability.
>>> 
>>> I found the documentation for which parameters to change for temporally varying wind stress (http://mitgcm.org/public/r2_manual/latest/online_documents/node104.html) but the `externForcingCycle` and `externForcingPeriod` parameters seem only to be incorporated into the momentum equation.
>>> Do the parameters also apply to the SST forcing prescribed by `thetaClimFile` in the `data` name file or would I need to use the `rbcs` package by prescribing `rbcsForcingPeriod`, `rbcsForcingCycle` and `tauRelaxT`?
>>> In the latter case, should I simply comment out `tauThetaClimRelax` and `thetaClimFile` in the `data` name file?
>>> 
>>> Any clarification on this would be helpful. Thank you very much for your support in advance.
>>> 
>>> 
>>> Best,
>>> Takaya
>>> ———————
>>> PhD Candidate
>>> Physical Oceanography
>>> Columbia University in the City of New York
>>> https://roxyboy.github.io/
>>> 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
>> 
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
> 
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support