[MITgcm-support] Nudging SST data into MITgcm

[Ruibin Ding（丁睿彬）]

Thank you for your response. I am running the model now. So far it seems
good...

Best
Ruibin

Martin Losch <Martin.Losch at awi.de> 于2021年1月18日周一 下午5:31写道：

> Hi Ruibin,
>
> sounds good. In principle, the climsst/sss fields are forcing fields like
> any other and can controlled with startdate, and period. The “period” is
> the interval between data records (e.g. for daily data it’s 86400.) and the
> climsstTauRelax is the relaxation time scale i.e. dT/dt ~
> (1/climsstTauRelax) * ( Trelax - T )
>
> Martin
>
> > On 16. Jan 2021, at 13:32, Ruibin Ding（丁睿彬） <kirkding at gmail.com> wrote:
> >
> > Dear Martin,
> >
> > I find an experiment in the Verification called "global_with_exf". In
> the data.exf namelist, I found that they use climatological SST and SSS to
> Relax the modeled SST and SSS towards monthly climatologies of observation.
> > The detailed configuration in this namelist is as follows:
> > climsststartdate1 = 19920101,
> > climsststartdate2 = 000000,
> >  climsstperiod     = -12.,
> > # 2 months restoring timescale for temperature
> >  climsstTauRelax   = 5184000.,
> > Instead of climatology, now I want to relax the modeled SST with real
> observed SST with some time interval (tau). Correct me if I am wrong, I
> just change the " climsststartdate1" and " climsststartdate2" the same as
> the observation period. The "  climsstperiod " should be changed
> accordingly. Then I make the observed SST as inputfocing file the same as
> other external forcing fields.
> > Looking forward to hearing from you, thanks.
> >
> > Best regards
> > Ruibin
> >
> >
> > Martin Losch <Martin.Losch at awi.de> 于2021年1月12日周二 下午8:21写道：
> > Rubin,
> >
> > there are plenty of different ways of relaxation (which is the same as
> nudging) to surface fields, and even to 3D fields, depending on what you
> want to do exactly.
> >
> > Please have a look at the tutorials in the documentation and at the
> verifications experiments, which have a lot of examples; with pkg/exf the
> relevant parameter names contain climsst, without pkg/exf the parameters
> are tauThetaClimRelax, thetaClimFile, etc.
> >
> > Martin
> >
> > > On 12. Jan 2021, at 04:06, Ruibin Ding（丁睿彬） <kirkding at gmail.com>
> wrote:
> > >
> > > Dear support of MITgcm,
> > >
> > > I am a user of the MITgcm. I am writing this email to ask a question
> about how to nudge observed SST into modelled SST while the model is online.
> > > I find a similar function of "relaxation of climatological SST" in the
> data.exf namelist. I am wondering if MITgcm contains this nudging option or
> I have to add one into
> > > the temperature tendency equation or I can just modify the relaxation
> function mentioned above?
> > >
> > > Best regards
> > > Ruibin
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