[Dart-users] minor update to the wrf model_mod.f90 code

[Nancy Collins]

  hello dart users,

this note is for the wrf-dart users out there.

i've just committed a minor change to the wrf model_mod.f90 file.
here is the commit note:

Change the routine which returns the location of the state vector points.
The original version only had the mass grid to work from, and so computed
where the staggered points for the U and V grids should be.  However with
a deformed grid these were not exactly in the right places.  The code was
recently changed to read in the U and V staggered grids for writing to the
output diagnostic files, so those grids are now available for use by this
routine.  For the U and V staggers, look up the point locations directly
in the arrays instead of doing a computation.

note that this code is now more accurate, and the expected differences are
slight, but it will NOT be bitwise reproducible with previous versions.
in simple tests over the CONUS domain i saw differences in the output
state space diagnostics of order 10e-4 in the U and V field values.


if you've got any questions, please email glen (romine at ucar.edu)
and/or me (nancy at ucar.edu).

thanks,
nancy