[MITgcm-support] SST relaxation with temporal variability

Uchida Takaya tu2140 at columbia.edu
Mon Mar 26 12:53:28 EDT 2018

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?


> 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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