[MITgcm-support] Time varying OBCs

[Patrick Heimbach]

Stefano,

in all likelihood you're now running into a different
type of problem.
The time-dependent obcs always reads 2 consecutive
records and linearly interpolates onto the current timestep.
Records are computed according to what you've specified
in data.obcs as obcs...period.

Now, it may happen that for your last (or last few) timesteps,
based on your specified time period between two records,
obcs tries to read an additional record to do the
linear interpolation in time.
As a quick fix to see whether this is the problem,
can you augment your obcs files by one record.

As a second fix, if your obcs values are monthly with
a yearly repeat cycle, let me know there's another way
to solve this.

In the long run, we (the MITgcm team) need to provide
a cycle period of each field that can be read.

-Patrick



Quoting "quero_s at libero.it" <quero_s at libero.it>:

> Hi,
> I updated the mdsio_slice.F routine (April, 8th) but I still encountered
> problems with multiprocessor runs. In particular, I use time dependent BC
> values. Before the update, the program reached the end of the BC file at
> startup, now it stops at the nextlast period of the cycle (always at the
> eastern boundary, with every kind of domain decomposition (2 x 2 , 4 x 1)).
> Has anyone tried this kind of OBCs? Maybe it's my fault!
> If someone is interested (?!) I can give my version of the code (I put the
> call to exf_getobcs in the obcs_calc routine, and did some other
> modifications on few routines).
> 
> Cheers,
> 
> Stefano
> 
> 
> _______________________________________________
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> MITgcm-support at mitgcm.org
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> 


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Patrick Heimbach     Massachusetts Institute of Technology
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