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<br />. <br /> <br />3. 1985 FIELD RESEARCH PROGRAM <br /> <br />. <br /> <br />by Alexis B. Longl <br /> <br />. <br /> <br />The field research program was aimed at increasing our under- <br /> <br />standing of 1) the delivery of seeding material to clouds over the <br /> <br />Tushar Mtns, and 2) the physics and kinematics of the clouds. In order <br /> <br />to reach these overall objectives and focus the field effort several <br /> <br />specific lines of investigation or "experiments" were defined. <br /> <br />a. Experimental approach. The study of the transport of cloud <br /> <br />seeding material involved two experiments. First, sulfur hexafluoride <br /> <br />(SF6) tracer material was released from ground locations upwind of the <br /> <br />Tushar Mtns and sampled at surface sites near and on the mountains (see <br /> <br />Fig. 7 on the following page and Fig. 20 on page 78). Second, zero-lift <br /> <br />balloons were rE!leased from an upwind site (see Fig. 7) and tracked as <br /> <br />they moved toward the Tushar Mtns (or in other directions). Supporting <br /> <br />rawinsonde data were ga.thered in both experiments. The information <br /> <br />acquired in these experiments has been ex.~mined and conclusions drawn as <br /> <br />to the likely transport of ground-released seeding material should there <br /> <br />be seeding. <br /> <br />The physic s and kinematics of winter clouds over the Tushar Mtns <br /> <br />were examined through several different but related experiments: <br /> <br />Experiment 1: Mesoscale atmospheric kinematics <br /> <br />Data from a single Doppler radar were collected upwind of the <br /> <br />Tushar Mtns. The data are used in this report to describe the mesoscale <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />1 Desert Research Institute, Reno, NV <br /> <br />. <br /> <br />-23- <br />