[MITgcm-support] OBCS/EXF in Checkpoint68d

[Roberta Sciascia]

Hi Oliver, 

Great to hear that it has been fixed!
It was an unlucky timing to download a new checkpoint but the perfect model setup to find the bug. 

Hope is all well with you too. 

Cheer, Roberta 




> On 15 Nov 2021, at 21:17, Roberta Sciascia <roberta.sciascia at sp.ismar.cnr.it> wrote:
> 
> Hi everyone, 
> 
> I’ve recently dowloaded the MITgcm checkpoint68d and stumbled upon an error in the OBCS/EXF handling that I suppose might be related to the commit 
> “Add interannual monthly forcing to exf “. 
> I’ve run this same configuration successfully on an older version of the MITgcm (checkpoint67b) but wanted to use the option OBCSbalanceSurf so I’ve upgraded to a newer version. 
> 
> I run a configuration with OBCS read from files and time levels controlled from the EXF_NML_OBCS. 
> In my specific case, I have only one open boundary, the southern one and here is how my EXF_NML_OBCS looks like 
> 
>  &EXF_NML_OBCS
> 
> #
> 
>  obcsSstartdate1   = 20160101,
> 
>  obcsSstartdate2   = 000000,
> 
>  obcsSperiod       = 21600.,
> 
> #
> 
> The configuation was compiling correctly but failing to run with the following error
> 
> (PID.TID 0000.0001) *** ERROR *** CAL_CHECKDATE: Invalid month in date(1)=         0
> 
> 
> (PID.TID 0000.0001) *** ERROR *** CAL_FULLDATE: fatal error from cal_CheckDate
> 
> This error is caused by the field OBCSN that in my case is not defined and doesn’t have a Startdate set. However, I suppose that with the modification to the file exf_getffield_start.F <https://github.com/MITgcm/MITgcm/compare/checkpoint68d...master#diff-5c86463f942c7c23fd7c4b443144629c9036aa58922d7e67cc6ccb3db613665f> and specifically the condition in the new lines 80-81  
> 
> 
> IF ( useCAL .AND. .NOT.(fld_period.EQ.-12. .OR. & (fld_period.EQ.-1 .AND. useYearlyFields)) ) THEN
> 
> is true even for non-active OBC hence the model is unable to run because in the case of a non-active boundary the date is equal to zero. 
> 
> Reverting to the old configuration IF ( useCAL .AND. fld_period.GT.0. ) THEN solved the problem for me but I don’t think my OBCS configuration is a corner case and thought this might be useful to everyone. 
> 
> Hope this is somehow clear
> 
> Cheers, 
> Roberta 
> -- 
> Roberta Sciascia
> 
> Consiglio Nazionale delle Ricerche
> ISMAR - Istituto di Scienze Marine
> Sede Secondaria di Lerici 
> Forte Santa Teresa – 19032 Lerici (SP), Italy
> tel: +39 0187 1788903
> 
> 
> 
> 
> 

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