Any idea how to make out such variables

From: guez offtsing <offtsing.2006_at_nyahnyahspammersnyahnyah>
Date: Wed, 17 Oct 2007 12:31:53 +0800

I want to analyze the wind field from NCEP data.GrADs was ever used.
Somehow the variable names decomposed from grb files in NCL are quite
different to ones in GrADs.
In GrADs, I can get more information from the corresponding ctl file.
While in NCL, where or which command can help me understand them?
For example,
V_GRD_3_PVL_10
What is the meaning of abbr. PVL, and the number "10"?

-- 
guez offtsing <offtsing.2006_at_gmail.com>
IAP
Received on Tue Oct 16 2007 - 22:31:53 MDT

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