[MITgcm-support] question on the time for the obcs data

[Martin Losch]

Hi Zhenhua,

the parameters in exp4/input/data mean that the interval between two forcing time slices is 21600seconds (externForcingPeriod), and that after 43200sec (externForcingCycle) the model starts at the first forcing time slice again. The forcing fields are assumed to be in the center of the interval, if I am not mistaken. In this example there are only two forcing time slices. If you want to have twelve (say twelve “months” of 30 days), that repeat themselves after one year (360 days) it should look like this:

> externForcingPeriod=2592000.,
>  externForcingCycle =31104000.,

Martin

On Mar 28, 2014, at 10:21 AM, linzhenhua <linzhenhua at 163.com> wrote:

> Hello, Martin
> 
> Thanks for your reply. I've read the manual and the exp4 tutorial, but it is still not clear to me. I do not use the exf package. If I have the following in my data file:
> 
>  periodicExternalForcing=.TRUE.,
>  externForcingPeriod=21600.,
>  externForcingCycle =43200.,
> 
> and there are two records in OBXyFile, does this mean that the corresponding time for the obc data are 0 and 21600?
> if I have more data records in OBXyFile, e.g. 3 records, does this mean that the corresponding time for the data are 0, 10800 and 21600?
> 
> 
> At 2014-03-28 16:47:40,"Martin Losch" <Martin.Losch at awi.de> wrote:
> >Hi Zhenhua,
> >
> >in the default way (see example verification/exp4), the timing is the same as for the forcing and is controlled in data by the usual parameters externForcingPeriod/Cycle, etc. see the documentation and the examples.
> >
> >when you use the exf package there is a litte more flexibility and the parameters are set in data.exf in analogy to the exf-parameters. You can have a look at the example verification/seaice_obcs
> >
> >This is actually described in the documentation
> ><http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html#SECTION00731540000000000000>
> >
> >
> >M.
> >
> >On Mar 28, 2014, at 8:50 AM, linzhenhua <linzhenhua at 163.com> wrote:
> >
> >> Hi
> >>  I have a question on the OBCS package. From the manual I know that the open boundary condition data could be written in the file OBXyFile, but I do not find the info on how to define the corresponding time for these records. Can any experts help me on this issue?
> >> 
> >> 
> >> 
> >> --
> >> Zhenhua Lin
> >> Key Laboratory of Ocean Circulation and Waves (KLOCAW)
> >> Institute of Oceanology
> >> Chinese Academy of Sciences
> >> Nanhai Road 7
> >> Qingdao 266071
> >> PR China
> >> 
> >> 
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> >
> >
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