[MITgcm-support] External forcing for deltaT < 1 sec

[Dustin Carroll]

Hi,

Thanks for getting back to me, good to know that it should work. I have only used the periodicExternalForcing for wind stress before so perhaps I am setting it up wrong with OBCS. 

Here is how I am setting it up in data for forcing hourly for 30 days.

 periodicExternalForcing=.TRUE.,
 externForcingPeriod=3600.,
 externForcingCycle=2592000.,

Here is my data.obcs file, the bin files contain 720 records (2592000/3600).

# ***************
# Open boundaries
# ***************
 &OBCS_PARM01
 OB_Iwest  =   1*1,
 OB_Ieast  =   1*-1,
 useOBCSprescribe=.TRUE.,
 useOrlanskiWest=.TRUE.,
 useOBCSbalance=.TRUE.,

 OBEtFile='OBET_hr.bin',
 OBEsFile='OBES_hr.bin',
 OBEuFile='OBEU_hr.bin'

 OBWtFile='OBWT_hr.bin',
 OBWsFile='OBWS_hr.bin',

 OBCS_monitorFreq= 3600.,
 OBCS_monSelect = 3,
 &

 &OBCS_PARM02
 &

Just want to check I’m setting this up right — perhaps I am missing a flag somewhere. Everything is running properly with a static BC setup.

Best,
Dustin



On Apr 11, 2014, at 6:20 PM, linzhenhua <linzhenhua at 163.com> wrote:

> Hi  Dustin,
> I have used this method for high resolution simulation forced with obc, and the results seem reasonable for me. The time step in my configuration is 0.5s.
> 
> 
> 
> At 2014-04-12 04:09:57,"Dustin Carroll" <dcarroll at uoregon.edu> wrote:
> >Hi All,
> >
> >I am running some high-resolution experiments where the time step is < 1 second and I need to have time dependent boundary conditions. 
> >
> >Normally I use EXF for this, but for these experiments I can’t because the cal pkg doesn’t support deltaT < 1. 
> >
> >I tried using the basic periodicExternalForcing but that didn’t properly loop through my forcing files properly when deltaT < 1. Can anyone confirm that periodicExternalForcing works with deltaT < 1 or recommend a method for time dependent bc's with these small time steps?
> >
> >Thanks,
> >Dustin 
> >
> >
> >
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> 
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