[MITgcm-support] Nudging SST data into MITgcm

Ruibin Ding(丁睿彬) kirkding at gmail.com
Sat Jan 16 07:32:58 EST 2021

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

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
> > _______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
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