of influence exerted by the step 1 wind field is inversely

related to the value of parameter R . The exponent, n, 1

controls the relative influence of observations distant from a

given grid point.

Figure 3c - ARM3 wind field for level 6, 2400 meters, for July

21, 1984.

processor for July 21, 1984, at 1200 LST (Figures 3a, 3b, and

3c) exhibit markedly different features than those generated by

the MESOPUFF-II processor. First, it must be noted that the

MESOPUFF-II winds are mixed layer averaged winds, whereas the

ARM3 generated winds represent thinner layers of fixed

thickness, above ground level. Although the vector fields of


Figure 2 represent somewhat different layers than those in

Figure 3, some similarities might be expected. First the 10

meter field of Level 1 exhibits a relatively slow flow field.

The influence of the interpolation scheme around surface

stations is quite evident, particularly in the vicinity of

Richmond, where the vectors are at about 90 from the mean flow

around Richmond. Other than some of the local station

influences, there is little resemblance between the ARM3 and

MESOPUFF-II Level 1 wind fields. The 300 meter winds generated

by the ARM3 meteorological processor (Figure 3b) might be

expected to be more similar to the MESOPUFF-II Level 1 field

(Figure 2a), since it represents a mixed layer average and

since the ARM3 300 meter winds should be relatively

representative of the mixed layer around 1200 LST; they are,

however, quite disparate. Also, 300 meters might be the

expected plume height of a relatively large source with a

moderately tall stack. The MESOPUFF-II winds reach speeds of

18.9 m/s in the northeast corner of the domain. The ARM3

generated winds only reach 9.4 m/s. Both models have an area

of stronger winds along the coastal area, but the wind

directions are shifted by approximately 90. The inland winds

of the ARM3 Level 3 are relatively uniform from the NE (see

Figure 3b), with the exception of the southwest corner of the

modeling domain where they are light from the SW. The

MESOPUFF-II winds are much more variable. Again the wind

directions are shifted by about 90. The MESOPUFF-II winds

above the mixed layer and the ARM3 2400 meter winds are very

similar. The wind directions are about the same and the

overall magnitude of the winds is about the same.

As previously noted, the two models handle the generation

of winds above the surface somewhat differently. The MESOPUFFII

approach uses the deviation between the surface and upper

air wind speeds and directions at the time of the soundings and

the current hour's surface data to calculate the wind speeds



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