Re: 3d Potential Vorticity

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Fri Aug 12 2011 - 07:42:53 MDT

You do not specify the context under which you want to calculate PV.

WRF model:
http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_pvo.shtml

Global hybrid model and pressure level grids:
Within 'shea_util.ncl' there are 2 unsupported functions:

function PotVortHybrid\
             (p:numeric, u:numeric, v:numeric, t:numeric
             ,lat[*]:numeric, gridType[1]:integer, opt:integer)
;
; Compute Isentropic Potential Vorticity on hybrid levels
; CCM Processor User's Guide: May 1994: page B-19
; Original source P Rasch and B Boville
=====
undef("PotVortIsobaric")
function PotVortIsobaric\
             (p[*]:numeric, u:numeric, v:numeric, t:numeric
             ,lat[*]:numeric, gridType[1]:integer, opt:integer)
;
; Compute Potential Vorticity on constant pressure levels
; Bluestein: Synoptic-Dynamic Meteorology in Midlatitudes
; pg 264 Eq 4.5.93

The documentation can be seen via

%> less $NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl

and search for the above 2 functions.

On 8/12/11 5:07 AM, Tim Baker wrote:
> Hi,
>
> I am wanting to plot PV from the full 3d vorticity vector, am I right
> in thinking that the built in "pvo" diagnostic only includes the 2d
> components? If so is there some code out there for calculating the
> full 3d PV?
>
> Regards
>
> Tim
_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Fri Aug 12 07:42:59 2011

This archive was generated by hypermail 2.1.8 : Fri Aug 12 2011 - 11:48:30 MDT