[MITgcm-support] what happens when run is shorter than diagnostic averaging frequency

[Martin Losch]

Hi Dan,
I am not sure what the diagnostics package does in this case, but you can write pickup files with the diagnostics package that avoid this problem. These the relevant runtime parameters for data.diagnostics (from diagnostics_readparms.F):

     &     diag_pickup_read,     diag_pickup_write,
     &     diag_pickup_read_mnc, diag_pickup_write_mnc,

Martin

> On 2. Aug 2023, at 07:59, Daniel Goldberg <Dan.Goldberg at ed.ac.uk> wrote:
> 
> Hello All
> 
> This might be a very basic question but i can't figure it out from looking at the code.
> 
> I am using the frequency() parameter in data.diagnostics with a value > 0, and NOT using timephase() or averagingFreq(). For experiment-specific reasons I am restarting from a pickup on a frequency shorter than the diagnostic frequency, i.e. 
> 
> frequency(1) = 2592000
> 
> but the length of each run i.e. nTimesteps * deltaT = 432000.
> 
> So, every 6th run, a diagnostics file is written, for a run that is 5 days long, with an averaging period of 30 days (Im using a model calendar if it matters). I am just wondering what diagnostics will do in this case. When a diagnostics file is written, will it average only over the last 5 days? Will it do so, but give a value that is 6 times too small?
> 
> Many thanks! As I said, apologies if this should be obvious from the docs!
> 
> dan
> 
> --
> Daniel Goldberg, PhD (he/him)
> Reader in Glaciology
> School of Geosciences, University of Edinburgh
> Geography Building, Drummond Street, Edinburgh EH8 9XP
> 
> Please note I am not working Mondays during June/July/August 2023 due to childcare responsibility.
> 
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