flow is in a terrain-tangent direction with no change in speed.
If F is greater than F , then flow is not adjusted.r rc
After the domain mean flow is adjusted for both the
kinematic effects of terrain and thermodynamic blocking
effects, the available observational data are combined with
this field to produce a final gridded wind field. This
involves interpolation, smoothing of the analyzed field,
computation of a vertical velocity field and a minimization of
the three-dimensional divergence. The discussion here will
only focus on the interpolation of the observational data into
the modified domain mean wind field, since this feature will
most affect future considerations of the ARM3 wind fields.
The procedure for interpolating both the surface and upper
air data is a modified inverse weighting scheme. The
interpolation is carried out separately for each model level.
Unless otherwise specified, all surface wind observations are
incorporated into the lowest model level. Upper-air
observations are first vertically and temporally interpolated
to model levels and desired simulation times. The terrain
adjusted, domain mean horizontal components of the wind at each
grid point, (u,v) , are modified to yield the observationally1
interpolated wind, (u,v) as follows:'
This procedure weights the step 1 wind field, (u,v) ,1
heavily in regions far removed from observations. The degree
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