[gradsusr] Potential vorticity

[Charles Seman]

Bogdan,

Please check out Bob Hart's script here: 
ftp://grads.iges.org/grads/scripts/isen.gs

There is an example of calculating "pv320" for a single level.  Seems 
script is designed to do one level.  Thinking that the script could be 
called to calculate a 2D PV field for a given isentropic level, and then 
use GrADS "set gxout fwrite" 
(http://grads.iges.org/grads/gadoc/gradcomdsetgxout.html) to write the 
field to a GrADS binary file before proceeding to the next isentropic 
level.  So the 3D IPV dataset would be built level-by-level after which 
a GrADS ctl file could be used to read in the 3D IPV field for 
calculating a vertical cross section...  If using GrADS v2, could use 
GrADS "sdfwrite" instead 
(http://grads.iges.org/grads/gadoc/gradcomdsdfwrite.html) and would not 
need a GrADS ctl file for reading in the data later...

Hope this helps,
Chuck

Bogdan Antonescu wrote:
> Hello,
>
> My name is Bogdan and I am trying to obtain some vertical cross section in
> the potential vorticity field. I have the datasets (u, v and T) and I 
> want to ask
> if anyone knows if where I can find a script that calculate the 
> potential vorticity.
>
> Thank you very much!
>
> Cheers,
> Bogdan
>
>
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-- 

Please note that Charles.Seman at noaa.gov should be considered my NOAA
email address, not cjs at gfdl.noaa.gov.

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