question on NCL function cz2ccm

From: Jianping Pan (pan1 AT uiuc.edu)
Date: Thu Oct 21 2004 - 08:31:20 MDT

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Dear Friends,

I am a little bit confused on the usage of cz2ccm function in NCL, it's
stated as

function cz2ccm(
         ps : numeric,
         phis : numeric,
         tv : numeric,
         p0 : numeric,
         hyam : numeric,
         hybm : numeric,
         hyai : numeric,
         hybi : numeric
     )

and hyam, hybm, hyai, hybi: input, hybrid coordinate coefficients for base
pressure (layer midpoints; ground to top), and there's no description for
other variables.

I am wondering what's the direction of "tv" should like to be, as it also
has a direction in the vertical level. For the output "HGT", there also is
a direction concern.
Thanks a lot for your help!
-Jianping

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