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<br />I II -22 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />(4) Simultaneous ice crystal concentration measurements using two 2D-C <br />cloud probes, both on the ground and aspirated. This needs to be done <br />once as a check that the two probes perform similarly. <br /> <br />(5) Simultaneous ice crystal concentration measurements, using oil- <br />coated s 1 i des and an aspi rated 2D-C cloud probe, to augment s imil ar <br />observations made last year. <br /> <br />4. K-band Radar Operations <br />The DRI (Desert Research Institute) will operate two Ka band radars during the <br />1986-87 intensive field season. A fixed pointing radar will be operated at <br />the Kingvale observatory. A scanning Ka band radar will be operated at the <br />Tahoe-Truckee airport. Both systems will be operated during all aircraft <br />seeding experiments and selected ground seeding operations. Staffing will be <br />provided by DRI personnel. DRI will be responsible for all maintenance, <br />logistics, and calibrations. Detailed specifications of each radar are given <br />in table 3-3. <br /> <br />Both radars will record data on 9 track, 1600 BPI tapes. Video recordings of <br />the color display will also be made for near real-time perusal of the data. <br /> <br />5. Precipitation Chemistry and Stable Isotope Program <br />The proposed field plan for 1986 is as follows: <br />a. Snow sampling will be conducted at Kingvale and the Tahoe-Donner site <br />before, during, and after all aerial seeding periods or whenever tracer <br />aerosols are being released by aircraft during the field season, November <br />3; 1986, through January 9, 1987. The time schedule outl ined previously <br />will be used. Snow sampling will also occur for selected ground seeding <br />experiments within a predetermined 9-hour period. When possible, sequen- <br />