[gradsusr] Grads vertical derivative error with cdiff

[Eric Altshuler]

As I recall, the person who started this thread is using WRF. The vertical coordinate in raw WRF history output is neither pressure nor height, but a hybrid coordinate. In grads, z levels would correspond to constant hybrid coordinate surfaces. Taking vertical derivatives with respect to this hybrid coordinate would not be very useful. The available postprocessing tools for WRF can interpolate fields onto pressure or height levels.

Eric

----- Original Message -----
From: "Arlindo da Silva" <dasilva at alum.mit.edu>
To: "GrADS Users Forum" <gradsusr at gradsusr.org>
Sent: Tuesday, May 8, 2012 2:21:41 PM
Subject: Re: [gradsusr] Grads vertical derivative error with cdiff


On Tue, May 8, 2012 at 1:42 PM, Andre Pattantyus < apattantyus2008 at my.fit.edu > wrote: 



you need to use geopotential on pressure surface you will never get an answer with z coordinate. This is a basic units concept people! 




In GrADS "z" is used to refer to the vertical dimension in index space, whatever that is: pressure or height. 


Arlindo 
-- 
Arlindo da Silva 
dasilva at alum.mit.edu 

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