[MITgcm-support] OBCS/EXF in Checkpoint68d

[Oliver Jahn]

Hi Roberta,

fast catch!  You narrowly beat me to submitting my fix:
https://github.com/MITgcm/MITgcm/pull/562.

Hope all is well!

Cheers,
Oliver


On 2021-11-15 15:17, Roberta Sciascia 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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