Re: Fixing the value of variable at certain time step......???

Hi Rashed,
I would use the read/write option in addfile to read in the file, grab
the variable you want, modify it, and write it back to the netCDF file.
(Note: Make a backup copy of your aerosol.climatology.nc file first
before you attempt to alter it.)

http://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml

a = addfile("aerosol.climatology.nc","w")
arr = a->so4_anthro ; not sure if that's the variable you want
arr = ; set to whatever value(s) you want
a->so4_anthro = arr

That should be it. Just to be clear, the above snippet of code will
overwrite the so4_anthro variable from the aerosol.climatology.nc file.

If the above doesn't help let the ncl-talk group know..
Adam

On 08/27/2010 02:16 AM, Rashed Mahmood wrote:
> Hi
> I have aerosol climatology data file containing the decadal aerosol
> climatologies of different types of aerosols. I have attached the file
> dump results as txt file.
> I want to fix the sulphate aerosol (variable number 7 in the file) at
> 1970 or before level so that it can be used as an input in a GFDL-AM2
> model.
> Does anybody has any code for doing it using NCL?
> Thanks and regads
> Rashed
>
>
>
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-- 
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Adam Phillips 
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National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
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