[MITgcm-support] error tutorial_cfc_offline, uVeltave file not existing when nTimeSteps increased

[Martin Losch]

Hi Céline,

you need to have more “offline” data to drive the model with. Currently there are only two time-slices in the repository (too keep it “light” for downloading), so that you can only simulate “between” these two time-slices that are 30 days appart. 
I don’t know if there is more data available somewhere. Keep in mind that these tutorials/verification experiments are only meant to give you an idea, how things are done in principle.

Martin
> On 22 Mar 2017, at 15:40, Céline Heuzé <celine.heuze at gu.se> wrote:
> 
> Hello,
> I’m starting with MITgcm by running the tutorial_cfc_offline case. All goes well, until I increase nTimeSteps to 30 or larger; then I get the error:
> (PID.TID 0000.0001) *** ERROR ***  MDS_READ_FIELD: filename: ../input/input_off/uVeltave.0004248120 , ../input/input_off/uVeltave.0004248120.001.001.data
> (PID.TID 0000.0001) *** ERROR ***  MDS_READ_FIELD: Files DO not exist
>  
> There was a 2011 thread suggesting to add an offset of 30 timesteps (15 days) to the data.off file; that changed nothing.
> Also testing various offlineIter0 only changed the iteration of the uVeltave non-existing file, seemingly to 720 + offlineIter0.
>  
> I test with the default settings in data.h, only nTimeSteps increased:
> nIter0  = 4269600,
> nTimeSteps = 30,
> deltaTmom = 900.0,
> deltaTtracer= 43200.0,
> deltaTClock = 43200.0,
> abEps = 0.1,
> pChkptFreq=3110400000.,
> dumpFreq=  31104000.,
> taveFreq=  31104000.,
> monitorFreq= 2592000.,
> periodicExternalForcing=.TRUE.,
> externForcingPeriod=2592000.,
> externForcingCycle=31104000.,
>  
> Settings in data.off, with an example of how I set the offset to -30 timesteps x deltaT:
>   offlineIter0=4248000,
>   offlineTimeOffset=-1296000.,
>   deltaToffline=43200.,
>   offlineForcingPeriod=2592000.,
>   offlineForcingCycle=31104000.,
>  
>  
> Ultimately, I want to run this test case for several years.
> Thanks in advance for any suggestion.
>  
> Regards,
> Céline
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