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<br />./i <br /> <br />Experiment 2: Kinematics of the particle gro~th environment <br /> <br />Lead Scientist: Robert A. Kropfli, WPL <br />Participating Scientists: Alexis B. Long, Patricia A. Walsh, DRI <br />William R. Moninger, Taneil Uttal, WPL <br /> <br />.~ <br /> <br />Objectives of the analysis are 1) to measure the rate of lift of <br /> <br />air over the Tushar Mtns and from this estimate the rate of conden- <br /> <br />. <br /> <br />sation, and 2) to measure the horizontal velocities of particles blowing <br /> <br />across the mountains and from this estimate available growth times. <br /> <br />Doppler velocity data from both the NCAR C-band and WPL Ka-band radars <br /> <br />will be used. the Velocity-Azimuth-Display (V AD) analysis technique <br /> <br />. <br /> <br />will be primary. It yields the average horizontal and vertical veloci- <br /> <br />ties over the circles of various diameters and altitudes observed by the <br /> <br />e- <br /> <br />radar in the 360 degree scans. The technique yields better results in <br /> <br />more stratiform, spatially uniform clouds. Vertical and horizontal wind <br /> <br />velocities will also be derived from the elevation scan radar data using <br /> <br />-e. <br /> <br />1) dual-Doppler techniques and data from both radars when the scan is <br /> <br />along the baseline and the wind is in that direction, or 2) <br /> <br />single-Doppler techniques and data from each radar separately when the <br /> <br />. <br /> <br />scan is not along the baseline and the wind is not in that direction. <br /> <br />(The single-Doppler techniques require certain assumptions as to spatial <br /> <br />uniformity of the winds.) <br /> <br />Fig. 2 shows the vertical region of space <br /> <br />. <br /> <br />where the dual-Doppler technique will yield results with acceptable <br /> <br />errors. <br /> <br />There will also be some dual-Doppler analysis of the data <br /> <br />collected by the two radars in the volume scan mode. The lower eleva- <br /> <br />. <br /> <br />tion angle data will be more suitable for this study, and Fig. 3 shows <br /> <br />the region where results with acceptable errors may be obtained. <br /> <br />. <br /> <br />. <br /> <br />24 <br />