calculating 1000 hPa heights below ground level

Hello!

I am trying to get the 1000-500 hPa Thickness from WRF ARW model output.
 For this, I need, of course, 1000 hPa and 500 hPa heights. I have
tried to use both wrf_interp_3d_z and wrf_user_intrp3d to do this, but
both give me "missing" heights for much of the 1000 hPa level, because
most of this is below ground level.
    z1000 = wrf_interp_3d_z(z,pf,1000.)
    z500 = wrf_interp_3d_z(z,pf,500.)
    z1000 = wrf_user_intrp3d(z,pf,"h",1000.,0.,False)
    z500 = wrf_user_intrp3d(z,pf,"h",500.,0.,False)
I assume there is a relatively easy function to calculate "heights"
below ground level, but I haven't been able to find it searching through
the NCL-Talk database.

Does anyone know how to do this, please?

Thanks!

Joe Grim

-- 
Associate Scientist III
NCAR/RAL/NSAP
FL2 Rm 2068
(303) 497-8397
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