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<br />~ Ii <br /> <br />important to more closely delineate the depth and <br />magnitude of the shear layer, both in direction and <br />speed. This influences the trajectories of seeding <br />material and resulting ice particles and, hence, <br />the targeting during seeding experiments. <br />Consequently, decision regarding the siting of <br />ground-based generators, or location of an airborne <br />seeding line, should take the airflow distortion <br />(shear) into account. <br /> <br />The shear investigations will primarily rely on two <br />instrument systems: a tethersonde balloon system <br />and an acoustical sounder. Both can provide hori- <br />zontal windspeed and direction in the lowest few <br />hundred meters. The acoustical sounder will be <br />used on top of the Mesa near the GMO (Grand <br />Mesa Observatory). The tethersonde can be moved <br />over snow and will be deployed at a number of loca- <br />tions. <br /> <br />3. Improve understanding of T&O (transport and dispersion) <br />of seeding material: <br /> <br />The T & 0 of seeding material, both ground and <br />aircraft released, will receive considerable atten- <br />tion during the January-March period. The T & 0 of <br />seeding material and associated ice particles in <br /> <br />5 <br />