[MITgcm-support] Surface waves relaxation without viscosity terms

Oliver Jahn jahn at MIT.EDU
Thu Jan 31 10:52:48 EST 2013


and thanks to Jean-Michel for explaining all this to me!

Oliver

On 2013-01-31 09:37, quentin jamet wrote:
> Hello Oliver,
>
> Yes, as you said, in my 4 years test run it was useless to call
> averagingFreq and repeatCycle. I actually misunderstood the principle of
> these two diagnostics parameters. Now, things are clearer in my head.
>
> Thanks for these additionnal explainations.
>
> Regards
>
> Quentin
>
>
> 2013/1/31 Oliver Jahn <jahn at mit.edu <mailto:jahn at mit.edu>>
>
>     Hello Quentin,
>
>     I think you solved your problem, but just to clarify (and at the
>     risk of stating the obvious) I'd like to point out that for simple
>     monthly averages you do not need averagingFreq nor repeatCycle, but
>     just frequency(1) = 2592000.  I am getting the impression that this
>     may be what you want, but maybe I am wrong.
>
>     averagingFreq and repeatCycle are basically for climatologies: you
>     want to average the January of each year and then only write the
>     average of all the Januaries, all the Februaries, etc, i.e. only 12
>     averages for several years.  If frequency is also set to a number of
>     years smaller than the model run, you will get multiple
>     climatologies.  Say frequency is 10 years.  Then you get a separate
>     climatology for every decade.  And yes, in the mnc file there will
>     be funny time values, clustered at the end of each decade.  But for
>     a climatology, there isn't really a single "time of averaging" for
>     each record, but several.
>
>     Cheers,
>     Oliver
>
>
>
>
>     On 2013-01-31 05:55, quentin jamet wrote:
>
>         Hello Jean-Michel,
>
>         I made a mistake when copying the data.diagnostics file. I did
>         remove
>         the frequency=50yearfor my previous tests.
>
>
>         I made better tests, and I think I fanally find the way out :
>         when using
>         mnc file format combined to repeatCycle, averaging diagnostics
>         are saved
>         at the end of the cycle. This results in a model_time 'T' into
>         the mnc
>         file which corresponds to the date of saving instead of the date of
>         averaging.
>
>         I hope I made myself clear enought.
>
>         Thanks again
>
>         Quentin
>
>         2013/1/30 Jean-Michel Campin <jmc at ocean.mit.edu
>         <mailto:jmc at ocean.mit.edu> <mailto:jmc at ocean.mit.edu
>         <mailto:jmc at ocean.mit.edu>>>
>
>
>              Hi Quentin,
>
>              I sometimes uses this repeatCycle and averagingFreq feature
>              but not with NetCDF files (although I thought I checked that
>              it was also working with mnc).
>
>              One thing that I found curious in your data.diagnostics file is
>              the frequency (50 yrs) which is much longer than the simulated
>              time (4.yrs). Don't know if this has something to do with
>         your problem.
>
>              Also, for the 2nd output file, should be:
>               >    fields(1:4,2) = 'THETA   ','SALT    ','PHIHYD
>           ','CONVADJ ',
>              instead of:
>               >    fields(1,2) = 'THETA   ','SALT    ','PHIHYD
>           ','CONVADJ ',
>
>              Cheers,
>              Jean-Michel
>
>              On Tue, Jan 29, 2013 at 11:33:18AM +0100, quentin jamet wrote:
>               > Dear MITgcm developpers and users,
>               >
>               > I have a problem using the diagnistic options
>         repeatCycle and
>              averagingFreq.
>               > When runing with this configuration for 4 years,
>         variables within
>              the output
>               > files DiagOcnEta.*.nc contains the good dimensions, i.e.
>         48 = 12*4. I
>               > expect to get one average output each month during my 4 year
>              simulation, but
>               > by looking at the *.nc file, the number of iteration at
>         which
>              diagnostics
>               > are made correpond to 1 diagnostics each year, and 1
>         diagnostic
>              at the 12
>               > previous iterations, but not 1 diagnostic each month.
>               > I did some test but I did not find out the answer. Did
>         anyone
>              have asolution to
>               > fix my problem?
>               >
>               > Many thanks
>               >
>               > Quentin
>               >
>               > PS : I copy a part of the file data.diagnostics below :
>               >
>               >   frequency(1) = 31104000.,
>               >   frequency(1) = 1555200000.,
>               > # frequency(1) = 2592000.,
>               >    filename(1) = 'DiagOcnEta',
>               >    fields(1,1) = 'ETAN    ',
>               >  averagingFreq(1) = 2592000.,
>               >    repeatCycle(1) = 12,
>               >
>               >   frequency(2) = 31104000.,
>               >   frequency(2) = 1555200000.,
>               > # frequency(2) = 2592000.,
>               >    filename(2) = 'DiagOcnTave',
>               >    fields(1,2) = 'THETA   ','SALT    ','PHIHYD
>           ','CONVADJ ',
>               > #                'UVELSQ  ','VVELSQ
>           ','UV_VEL_C','THETASQ ',
>               > #                'WVELTH  ','WVELSLT ',
>               >  averagingFreq(2) = 2592000.,
>               >    repeatCycle(2) = 12,
>               >
>               >
>               > --
>               > Quentin Jamet
>
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>         --
>         Quentin Jamet
>
>
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> --
> Quentin Jamet
>
>
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