[MITgcm-support] Question on using EXF, repeatPeriod, and fieldperiod

[Dan Jones]

Hi all,

I'm replying to my own comment in case anyone has a similar question in the
future.  Using the setup below, one can set

repeatPeriod = (length of entire external forcing cycle to be repeated, in
seconds)

in data.exf, and it will work (at least, it has worked for my setup!)
Setting repeatPeriod to something other than one year does *not* appear to
interfere with restoring to monthly climatology in data.exf.  It is
possible to comment out all the 'periodic/external' forcing stuff in data
and just let EXF handle all of the external forcing *and* SSS/SST restoring
(as shown in the data.exf snippets below).

Dan


On Mon, Aug 25, 2014 at 5:00 PM, <mitgcm-support-request at mitgcm.org> wrote:

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>    1. Question on using EXF, repeatPeriod,      and fieldperiod (Dan Jones)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 25 Aug 2014 14:51:44 +0100
> From: Dan Jones <dcjones.work at gmail.com>
> To: mitgcm-support at mitgcm.org
> Subject: [MITgcm-support] Question on using EXF, repeatPeriod,  and
>         fieldperiod
> Message-ID:
>         <CAPj3iHSwvSc9573J0fn5ZR+cnxKiwCK25Cv=
> h67RNMmSgVKODg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all,
>
> I am attempting to force an ocean model using six-hourly forcing fields.  I
> have three years of forcing data that I want to use on repeat (i.e. I want
> to loop the same three years over and over again).  In addition, I would
> like to restore SSS to a monthly climatology.  I'm trying to do all this
> through the EXF package.
>
> In data.exf, I have:
>
>  repeatPeriod = 0.,
>
> so that the individual field periods are used.  Next, I have settings for
> individual fields:
>
> #
>  uwindstartdate1   = 20080101,
>  uwindstartdate2   = 000000,
>  uwindperiod       = 21600.0,
> #
>
> For SSS restoring, I also have in data.exf:
>
> #
>  climsssfile = 'location of file',
>  climsssperiod = -12.,
>  climsssTauRelax = 10519500.,
> #
>
> This setup nearly works, except that the forcing files do not repeat.  The
> model abruptly terminates at the three-year mark after reporting that it
> can't find the next record in the external forcing file, i.e.:
>
> forrtl: severe (36): attempt to access non-existent record, unit 9, file
> EIG_u10m_SO6
>
> Is there a field variable that sets the cycle duration of individual fields
> (i.e. the repeat period of individual fields, something like
> externalForcingCycle in data)?  If I set repeatPeriod to three years in
> data.exf, will that affect my monthly SSS restoring?  Should I give up on
> using EXF exclusively and set something like the following in data
> (PARM03)?
>
> periodicExternalForcing = .TRUE.,
> externForcingPeriod = 21600.,
> externForcingCycle = 94694400.
>
> Would that approach clash with SSS restoring?
>
> Thanks very much!
> Dan
>
> ---------------------------------------------------------
>
> Dr Dan Jones
> British Antarctic Survey, NERC
> Cambridge, UK
>
> Phone: +44 (0)1223 221505
> Fax: +44 (0)1223 362616
> Skype:  dcjones.work
>
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