From: Matthew Widlansky <gtg058g_at_nyahnyahspammersnyahnyah>

Date: Thu, 03 Aug 2006 23:22:13 -0400

Date: Thu, 03 Aug 2006 23:22:13 -0400

I have begun using ncl built in functions to calculate divergence and relative

vorticity from NCEP Reanalysis data (2.5x2.5). As it is on a fixed grid, I was

using uv2dvF and uv2vrF. The results came out to the right order of magnitude

but were not realistic. I did the analysis again using the Centered Finite Diff

functions and everything seemed to work.

Any ideas why the fixed grid functions were not working? I also want to

calculate divergent wind components (dv2uvf) but there does not seem to be a CFD

function for this (which is why I ask about the problem with the fixed grid

method).

My code for the fixed grid method is below.

Thanks for taking the time to look at this problem.

-Matthew

;===========================================================

u = a_u->uwnd(:,:,:,:)

v = a_v->vwnd(:,:,:,:)

add_offset=202.660003662109

scale_factor= .00999999977648258

u_real=add_offset+u*scale_factor

v_real=add_offset+v*scale_factor

dv = uv2dvF (u_real,v_real) ; u,v ==> divergence

;===========================================================

-- _______________________________________________ ncl-talk mailing list ncl-talk_at_ucar.edu http://mailman.ucar.edu/mailman/listinfo/ncl-talkReceived on Thu Aug 03 2006 - 21:22:13 MDT

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