[MITgcm-support] Problem with EXF package

[Abbas Dorostkar]

Hi Van Thinh,
Thank you for prompt reply.
I would like to use wind speed as an input data although I can write a
Matlab routine to convert them to wind stress. Did you use just wind
speed data?
Do you mean that I have to use  EXF package in conjunction with external
forcing through PARM03? If so, You have defined wind stress file at
PARM03 not wind speed. Right? I am a little confused because I read a
post from Martin that periodicExternalForcing=.TRUE. flag does not have
any effect when we use EXF.
(http://forge.csail.mit.edu/pipermail/mitgcm-support/2005-August/003340.
html)

I would be glad if you clarify more
Thanks,
Abbas

**********************************
-----Original Message-----
From: mitgcm-support-bounces at mitgcm.org
[mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of Van Thinh Nguyen
Sent: Wednesday, December 05, 2007 11:05 AM
To: mitgcm-support at mitgcm.org
Subject: RE: [MITgcm-support] Problem with EXF package

Hi Abbas,


1) in data at &PARM03 you should add:
eg.:

  periodicExternalForcing=.TRUE.,
  externForcingPeriod=43200., <-- your period
  externForcingCycle=86400.,  <--- your circle

at &PARM05:

  add your windFile generated from matlab

2) add your windFile in data.exf

I already did the same way for Lake Erie (with stressfile), Leon (your 
advisor) has seen my results.

Good luck,

Vth

*********************************************************

On Wed, 5 Dec 2007, Abbas Dorostkar wrote:

> Hi all,
>
> Thanks to Matt and Patrick for replies.
>
> I definitely set useEXF = .TRUE. and use data.exf (attached) with the
> package. The problem is wind speed does not get converted to wind
> stress.
>
> I had a look on previous posts. It seems some other users had this
> problem before. See post
>
http://forge.csail.mit.edu/pipermail/mitgcm-support/2006-November/004434
> .html
>
> I have used Cartesian coordinate and specified wind speeds at every
grid
> point and at every time point. The file is wind(nx,ny,nt), where nt is
> the number of hours I have, like wind(x,y,t1), wind(x,y,t2), and so
on.
> I am not sure if the input file I have generated is correct. However,
> using same Matlab routine to generate wind stress file to be used in
the
> file "data", in namelist PARM03, works fine.
>
> I have also attached monitor output.
>
> I would appreciate it if someone give me ideas.
>
> Abbas
>
>
>
> -----Original Message-----
> From: mitgcm-support-bounces at mitgcm.org
> [mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of Matthew
Mazloff
> Sent: Wednesday, December 05, 2007 1:52 AM
> To: mitgcm-support at mitgcm.org
> Subject: Re: [MITgcm-support] Problem with EXF package
>
> Hi Abbas,
>
> You have to use data.exf with the EXF package.  data simply will not
do.
>
> -Matt
>
> e.g.
> http://mitgcm.org/cgi-bin/viewcvs.cgi/MITgcm/verification/
> global1x1_tot/input/data.exf?rev=1.5&content-type=text/vnd.viewcvs-
> markup
>
>
> On Dec 4, 2007, at 1:01 PM, Abbas Dorostkar wrote:
>
>> Hi all,
>> To see If I can get nonlinear internal waves with my model,  I
>> considered horizontal isotherms throughout a lake and applied a wind
>> stress for some hours along the main axis and then turned off the
wind
>> suddenly. When I use EXF package to prescribe time dependent wind
>> forcing (wind speed as an input), It seems model doesn't feel the
wind
>> stress. I checked the monitor statistics for that and the values for
>> wind stress are zero.  However, when I define wind stress in the file
>> "data", in namelist PARM03, everything works fine.
>> I would prefer to use EXF package as I have wind speed but I am not
>> sure
>> what the problem is. Any ideas?
>> Thank you
>> Abbas
>>
>> *************************
>> Abbas Dorostkar, PhD Student
>> Department of Civil Engineering
>> Queen's University
>> Room 444, Ellis Hall
>> 58 University Avenue
>> Kingston, Ontario, CANADA  K7L 3N6
>> **********************************
>>
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>
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