[MITgcm-support] SST relaxation with temporal variability

[Uchida Takaya]

Hi Martin,

Thank you very much for the clarification.

Best,
Takaya
———————
PhD Candidate
Physical Oceanography
Columbia University in the City of New York
https://roxyboy.github.io/

> On Mar 27, 2018, at 3:35 AM, Martin Losch <Martin.Losch at awi.de> wrote:
> 
> 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/
>>>> 
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