[MITgcm-support] [EXTERNAL] How to use pickups

[Menemenlis, Dimitris (US 329B)]

Hi Francesco, if you don’t mind a short spin-up period, e.g., as in Fig. 6 here: https://doi.org/10.1175/1520-0426(1997)014<1420:LOAOGC>2.0.CO;2<https://doi.org/10.1175/1520-0426(1997)014%3C1420:LOAOGC%3E2.0.CO;2>
then you can just dump Theta and Salt at last time step (and sea ice variables if you have sea ice) of the first run, modify Theta,
then restart from these new initial Theta/Salt conditions.

You can also try using the U/V/Eta of end of first run as first guesses, which might reduce the adjustment shock and adjustment time.

Either way, there is no need to specify the complete pickup files, since the velocity and tendency terms will be incosistent with the perturbed Theta.

Dimitris


On Nov 14, 2023, at 12:15 AM, Dattilo, Francesco <fdattilo at ogs.it> wrote:

Hi everyone,

I would like to launch a run with this form:
- First part with initial conditions I0;
- Second part which starts from the outputs of the first part as initial conditions + a change in the temperature profile.

I know this is possible by using the pickups, but it is still unclear the proper procedure, and how to define in data namelist which pickup to use, when and etcetera.

Is there a tutorial that explains it?

Thank you very much for the help.

All the best,

Francesco

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