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Hi Francesco, if you don’t mind a short spin-up period, e.g., as in Fig. 6 here: <a href="https://doi.org/10.1175/1520-0426(1997)014%3C1420:LOAOGC%3E2.0.CO;2">https://doi.org/10.1175/1520-0426(1997)014<1420:LOAOGC>2.0.CO;2</a>
<div>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,</div>
<div>then restart from these new initial Theta/Salt conditions.</div>
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<div>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.</div>
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<div>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.</div>
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<div>Dimitris
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<div>On Nov 14, 2023, at 12:15 AM, Dattilo, Francesco <fdattilo@ogs.it> wrote:</div>
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<div class="gmail_default" style="font-size:large">Hi everyone,</div>
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<div class="gmail_default" style="font-size:large">I would like to launch a run with this form:<br>
- First part with initial conditions I0;<br>
- Second part which starts from the outputs of the first part as initial conditions + a change in the temperature profile.<br>
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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.<br>
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<div class="gmail_default" style="font-size:large">Is there a tutorial that explains it?<br>
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<div class="gmail_default" style="font-size:large">Thank you very much for the help.</div>
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<div class="gmail_default" style="font-size:large">All the best,</div>
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<div class="gmail_default" style="font-size:large">Francesco</div>
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