[MITgcm-support] Re: single-layer configuration problem update

Tue Aug 30 11:07:07 EDT 2005

Martin, Dimitris:
Thank you for your help, this is enlightening!

Martin Losch wrote:

> Sergey,
> the verification/global_ocean.90x40x15/input/data has an example how 
> to specify time-variable forcing without the exf-pkg (compare to 
> global_with_exf, which is the exact equivalent with exf):
> in PARM03 you put this (this is for monthly forcing repeating itself 
> after one year, put whatever you have in data.exf there, the data 
> files are the same):
>  periodicExternalForcing=.TRUE.,
>  externForcingPeriod=2592000.,
>  externForcingCycle=31104000.,
> in PARM05 you put this:
>  zonalWindFile=  'trenberth_taux.bin',
>  meridWindFile=  'trenberth_tauy.bin',
>  thetaClimFile=  'lev_sst.bin',
>  saltClimFile=   'lev_sss.bin',
>  surfQFile=      'ncep_qnet.bin',
> The atmospheric pressure file is called "pLoadFile" or so (check in 
> ini_parms.F or PARMS.h)
>
> Martin
>
> On Aug 30, 2005, at 4:49 PM, Sergey Vinogradov wrote:
>
>> Martin:
>> I don't know of any other way than EXF to introduce the variable 
>> forcing into the mitgcm. The resulting field is not exploding though, 
>> it stays equal to i.c.
>> Anyway, SINGLE_LAYER_MODE is probably what I was looking for in a 
>> context of my experiments.
>> Thank you,
>> Sergey
>> Martin Losch wrote:
>>
>>> Sergey,
>>> that's really puzzling. Have you tried the same thing without the 
>>> EXF-package? (I have had unexpected behavior with this package before).
>>>
>>> However, if --- as you suspect --- no forcing fields introduced by 
>>> EXF is not "felt" by the model, then it wouldn't explode, but would 
>>> just keep quiet without moving at all. So I think, that on the 
>>> contrary, the model feels too much of the forcing; or something 
>>> completely different is going on.
>>>
>>> I can't remember your configuration, and obviously, I am too stupid 
>>> to search the MITgcm-support email list effectively so I didn't find 
>>> your previous emails, but were you using the CPP-flag 
>>> SINGLE_LAYER_MODE (kicks out most of thermodynamics)? However, even 
>>> if you were using it, I don't see where it should interfere with the 
>>> EXF package.
>>>
>>> Martin
>>>
>>> On Aug 30, 2005, at 3:49 PM, Sergey Vinogradov wrote:
>>>
>>>>  Hi all,
>>>>
>>>>  I just want to update you on my quest in solving the problem with 
>>>> single-layer run under dynamic forcing (and maybe get some useful 
>>>> feedback from you).
>>>>
>>>>  The issue was erroneous computation of ocean dynamics (sea-level, 
>>>> bottom pressure) in a single layer configuration with a use of EXF 
>>>> package interface for the time-varying atm. pressure loading.
>>>>
>>>>  Appearently, it is not a problem of just pressure loading. It is 
>>>> far more general problem, as I tried similar experiment with wind 
>>>> stress. It looks like any forcing that is introduced through EXF in 
>>>> one-layer run, is not "felt" by the model.
>>>>
>>>>  Below is the exerpt from the model output with one layer under 
>>>> wind stress at the beginning of forward integration where you can 
>>>> see the error accumulating in cg solver with each step. Similar run 
>>>> with 23 layers computes reasonable fields.
>>>>
>>>>  I'd appreciate any suggestions/comments/tips very much!
>>>>  Regards,
>>>>  Sergey
>>>>
>>>> (PID.TID 0000.0001) // 
>>>> =======================================================
>>>>  (PID.TID 0000.0001) // End MONITOR dynamic field statistics
>>>>  (PID.TID 0000.0001) // 
>>>> =======================================================
>>>>  (PID.TID 0000.0001)  MDSREADFIELD: opening global file: 
>>>> /anvil/scratch/day07/svv/forcing/NCEP_R6_ustr_1999
>>>>  (PID.TID 0000.0001)  MDSREADFIELD: opening global file: 
>>>> /anvil/scratch/day07/svv/forcing/NCEP_R6_ustr_1999
>>>>   cg2d: Sum(rhs),rhsMax =   5.83105612406154E-15  2.52789606828280E+01
>>>>   cg2d: Sum(rhs),rhsMax =   4.66381008031730E-09  2.03846096766287E+01
>>>>   cg2d: Sum(rhs),rhsMax =  -7.72491057666330E-11  1.63318316358843E+02
>>>>   cg2d: Sum(rhs),rhsMax =   7.82384650122037E-10  3.94671184216402E+02
>>>>   cg2d: Sum(rhs),rhsMax =   1.84482164570718E-10  1.39786242903642E+03
>>>>   cg2d: Sum(rhs),rhsMax =  -3.86795120889058E-10  5.51987500042437E+03
>>>>   cg2d: Sum(rhs),rhsMax =   5.60930842031203E-10  2.96468380272229E+04
>>>>   cg2d: Sum(rhs),rhsMax =  -4.60258786649532E-11  1.03144921478204E+06
>>>>   cg2d: Sum(rhs),rhsMax =   1.93486835808804E-12  3.16417950241384E+08
>>>>   cg2d: Sum(rhs),rhsMax =  -2.47236726757771E-12  2.35353664301718E+13
>>>>   cg2d: Sum(rhs),rhsMax =  -3.50420466366502E-16  2.44341352738558E+23
>>>>   cg2d: Sum(rhs),rhsMax =  -2.42051059455915E-16  1.68257839407874E+43
>>>>   cg2d: Sum(rhs),rhsMax =  -2.02970152146811E-16  1.42078931888867E+83
>>>>   cg2d: Sum(rhs),rhsMax =  -4.29685153894816E-16  9.27740314802081+162
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN                   INF
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN  0.00000000000000E+00
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN  0.00000000000000E+00
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN  0.00000000000000E+00
>>>>  (PID.TID 0000.0001)  MDSREADFIELD: opening global file: 
>>>> /anvil/scratch/day07/svv/forcing/NCEP_R6_ustr_1999
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN  0.00000000000000E+00
>>>>   cg2d: Sum(rhs),rhsMax =                    NAN  0.00000000000000E+00
>>>>
>>>
>>>
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