[RegCNET] Re: need a help(fvgcm-ctl file)

BI XUNQIANG bixq at ictp.trieste.it
Mon Nov 14 12:09:53 CET 2005


Hi, Siraj, Baris and Moet:

Baris's answer is right, the U, V, T, Q fields in FV_A22071JAN is not in
the standard GrADS format (real*4, direct or sequential format),
instead, it is in INTEGER*2 and direct access format. It's possible
to write a simple FORTRAN code to convert them into the GrADS format.

To write the simple code, you can follow the way I did in subroutine
GETFVGCM of ICBC.f

I wrote those fields in INTEGER*2 format in order to reduce the file
size. (For PS, I didn't do the same way because it will cause large
roundoff error for PS. But it's fine to let U, V, T, Q in INTEGER*2 
format).

My suggestion is that you just need check the fields in your 
ICBC2071010100 file (or if you like, you could convert them to
Pressure layer by using SIGMAtoP.f and make the comparison).

Hope this email could be the last email related to this question !

Best regards,
Xunqiang

On Sun, 13 Nov 2005, baris onol wrote:

> hi,
> there is no CTL for files because these files are not written in Grads 
> format.
>
> baris
>
>
> Siraj Ul Islam wrote:
>
>> I mean If we look in the data site
>> http://www.ictp.trieste.it/~regcm/model_and_data.htm 
>> <http://www.ictp.trieste.it/%7Eregcm/model_and_data.htm>
>>  there is a one month sample data set of FVgcm with ctl file (PS_A22071JAN 
>> <http://www.ictp.trieste.it/%7Eregcm/FVGCM/SAsia_EAsia/PS_A22071JAN> 
>> PS_A22071JAN.ctl 
>> <http://www.ictp.trieste.it/%7Eregcm/FVGCM/SAsia_EAsia/PS_A22071JAN.ctl>). 
>> But when we download the othe data file of fvgcm like FV_A22071JAN 
>> <http://www.ictp.trieste.it/%7Eregcm/FVGCM/SAsia_EAsia/FV_A22071JAN> then 
>> we donot have the ctl file so we cannot display it. and that is the 
>> problem. We need a ctl file or any medhod to display this file.
>> 
>>  Siraj
>> 
>> On 11/13/05, *moetasim* <mashfaq at purdue.edu <mailto:mashfaq at purdue.edu>> 
>> wrote:
>> 
>>     How is it? I mean if the problem is not in writing CTL file then
>>     what is the
>>     problem? I can't understand that what do you mean by CTL file
>>     perfectly written
>>     but still need to check for variables in datafile...Send your CTL
>>     file to have a
>>     look at its perfection.
>>     Moet
>> 
>> 
>>     Quoting Siraj Ul Islam <sirajkhan78 at gmail.com
>>     <mailto:sirajkhan78 at gmail.com> >:
>> 
>>     > Well Moet the problem is not to write ctl file but the
>>     variables. The
>>     > variables stored in the data are needed to display . We donot
>>     know what kind
>>     > of variables are in that FVgcm data file. The ctl file is
>>     perfectly written.
>>     > Is there any way to check what kind of variables names are in
>>     the data file,
>>     > if we donot have the variables names.
>>     >  Siraj
>>     >
>>     >  On 11/12/05, moetasim < mashfaq at purdue.edu
>>     <mailto:mashfaq at purdue.edu>> wrote:
>>     > >
>>     > > Well, I think one should be able to write CTL file at his own
>>     so use
>>     > > following
>>     > > info as hints:
>>     > > grid points along lat= 181
>>     > > grid points along lon= 288
>>     > > vertical sigma levels= 18
>>     > > The variables are written in the following sequence in the file:
>>     > > U
>>     > > V
>>     > > T
>>     > > Q
>>     > > Calculate grid spacing from number of grid points along lat
>>     and lon. Other
>>     > > files contain PS and ZS (Geopotential at surface).
>>     > > Data is on follwoing sigma levels (I think):
>>     > > 0.3,0.5,0.7,.1,.15,.2,.25,.3,.35,.42,.5,.6,.7,.78,.85,.92,.96,1.
>>     > >
>>     > > You may better post your CTL file at RegCNET after you write one.
>>     > > Good luck,
>>     > >
>>     > > Moet
>>     > >
>>     > >
>>     > > Quoting "M.Adnan Abid" <madnanabid at gmail.com
>>     <mailto:madnanabid at gmail.com>>:
>>     > >
>>     > > > >
>>     > > > How are you ? i need a little bit help from you, i need a
>>     fvgcm CTL
>>     > > > file or i want the name of the variables used in the model..
>>     > > > can you help me in this regard?
>>     > > > At ICTP the CTL file for th PS is available but not for the
>>     fvgcm.
>>     > > >
>>     > > > Cheers
>>     > > > Adnan
>>     > > >
>>     > > >
>>     > >
>>     > >
>>     > > --
>>     > >
>>     > > _______________________________________________
>>     > > RegCNET mailing list
>>     > > RegCNET at lists.ictp.it <mailto:RegCNET at lists.ictp.it>
>>     > > https://lists.ictp.it/mailman/listinfo/regcnet
>>     <https://lists.ictp.it/mailman/listinfo/regcnet>
>>     > >
>>     >
>>     >
>>     >
>>     > --
>>     > Siraj Ul Islam
>>     > 1: Research Fellow (Climate Section)
>>     > Global Change Impact Studies Centre
>>     > First Floor Saudi Pak tower
>>     > Blue Area Islamabad Pakistan
>>     > Ph : 92-51-9219785
>>     > Fax : 92-51-9219787
>>     >
>>     > 2: Mphil Scholar
>>     > Computational Physics and Simulation Group
>>     > Department of Physics
>>     > Quaid e Azam University
>>     > Islamabad.
>>     >
>> 
>> 
>>     --
>> 
>> 
>> 
>> 
>> -- 
>> Siraj Ul Islam
>> 1: Research Fellow (Climate Section)
>> Global Change Impact Studies Centre
>> First Floor Saudi Pak tower
>> Blue Area Islamabad Pakistan
>> Ph :   92-51-9219785
>> Fax : 92-51-9219787
>> 
>> 2: Mphil Scholar
>> Computational Physics and Simulation Group
>> Department of Physics
>> Quaid e Azam University
>> Islamabad.
>> 
>> 
>> 
>> ------------------------------------------------------------------------
>> 
>> _______________________________________________
>> RegCNET mailing list
>> RegCNET at lists.ictp.it
>> https://lists.ictp.it/mailman/listinfo/regcnet
>> 
>
>
> -- 
> Baris ONOL
> North Carolina State University
> Department of Marine, Earth & Atmospheric Sciences Box 8208
> Raleigh, NC, USA 27695-8208
> Phone: (919) 513 0243
>
> _______________________________________________
> RegCNET mailing list
> RegCNET at lists.ictp.it
> https://lists.ictp.it/mailman/listinfo/regcnet
>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~  Dr. Xunqiang Bi         email:bixq at ictp.it  ~ 
~  Physics of Weather and Climate Group        ~
~  The Abdus Salam ICTP                        ~
~  Strada Costiera, 11                         ~
~  P.O. BOX 586, 34100 Trieste, ITALY          ~
~  Tel: +39-040-2240302  Fax: +39-040-2240449  ~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



More information about the RegCNET mailing list