[MITgcm-support] rolling pickups: nchecklev value on restarting model

[Daniel Goldberg]

Hello All

In the setup Im working with, it matters to me whether at a given time, ckptA or ckptB is the suffix used for a pickup write! There is a variable nCheckLev in a common block in RESTART.h which seems to determine this behaviour.

>From grepping for ths variable, it seems to me that when we start from a pickup, this variable is reset.

Thus, if ckptFreq is set to e.g. 10000., and i do a run that is 10,000 seconds long, then pickup.ckptA.* will be written at the end of the run, assuming deltaT divides into 10,000. If the run were 20,000 seconds or more, then pickup.ckptB.* would be written at 20,000 seconds -- here im just describing rolling pickups.

BUT, assuming nCheckLev is reset each time the model is (re)started, then if I were to then restart the model from the pickup.ckptA.* written at 10,000 seconds, then pickup.ckptA.* would be OVERWRITTEN at 20,000 seconds.

I wonder if someone could comment on whether this is correct?

Many thanks
Dan



--
Daniel Goldberg, PhD (he/him)
Reader in Glaciology
School of Geosciences, University of Edinburgh
Geography Building, Drummond Street, Edinburgh EH8 9XP


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