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<br />1440 <br /> <br />JOURNAL OF APPLIED METEOROLOGY <br /> <br />VOLUME 35 <br /> <br /> <br />PLUMAS <br /> <br />PLP <br />@ B1ue Nose <br /> AllIn <br />~ <br />Mt. 'l'more <br />~ <br /> .2 <br /> N <br /> J TAHOE 9 <br /> . <br /> SF, <br /> RElEASE <br /> <br />1 2 ;, 4 5 I 7 8 51 10 <br />I I I I I I I I I I <br />Kilometerw <br /> <br />. <br />P6 <br /> <br />~ <br />q.~ <br />. DAV <br /> <br />NATIONAL <br /> <br />FOREST <br /> <br />LEGEND <br />. PROPANE DISPENSER <br />@ PREClPlTA1l0N GAUGE <br /> <br />FIG. 9. Nominal flight tracks used by the NOAA research aircraft during the 1993 tracer <br />and seeding experiments superimposed over the project area. <br /> <br />need only be concerned with the lowest kilometer <br />above the dispensers. Past tracer studies, as reviewed <br />by Reynolds ( 1988) and Super ( 1990), and the results <br />presented here, confirm this. Thus it is a relatively nar- <br />row vertical region for which the three-dimensional <br />wind field is needed to determine the transport and dis- <br />persion of seeded crystals. To determine the three-di- <br />mensional wind field, we need to be able to extrapolate <br />vertically the balloon-derived vertical velocities across <br />the project area from this single vertical profile. Fol- <br />lowing SR, the calculated rawinsonde vertical velocity <br /> <br />versus downstream distance is shown in Fig. 6. An at- <br />tempt is made to estimate the horizontal wavelength <br />below 3 Ian over the project area from analysis of the <br />distance between maxima and minima in the vertical <br />velocities. From Fig. 6 the wavelength is approximately <br />12 Ian for 10 February. The assumption will be made <br />that the wave has near-vertical phase lines in the lowest <br />1000 m above the crest. <br />Referring back to Fig. 4, we can see what is meant <br />by vertical phase and how it is important to this study. <br />Note the balloon trajectory shown in the figure. One <br />