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<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 />4.0 Aircraft ODerations <br /> <br />The T&D of ice crystals created near the dispensers by the <br />cooling of expanding propane is very important to the success of <br />the LOREP. Tracer gas (SF6) has been released from one of the <br />dispenser sites (Site 7) and monitored in the downwind valley and <br />on the upwind slope of the Grizzly Ridge during a few <br />experiments. While tracer gas has been detected at these <br />locations, it remains to be demonstrated that propane-created ice <br />crystals are routinely transported across the valley, growing <br />into snowflakes which settle on Grizzly Ridge. This can only be <br />accomplished by a combination of aircraft sampling and surface <br />sampling. <br /> <br />The National Oceanic and Atmospheric Administration (NOAA) has a <br />well-instrumented King Air C-90 research aircraft that has been <br />used in air quality, transport and dispersion (T&D) and cloud <br />microphysical investigations. The NOAA aircraft and crew carried <br />out extensive T&D and cloud microphysical investigations for the <br />Utah/NOAA Atmospheric Modification Research Program in central <br />Utah during early 1991. <br /> <br />~ <br /> <br />Under a Cooperative Agreement with the Bureau of Reclamation, <br />NOAA will provide a King Air C-90 research aircraft (N46RF) to <br />the LOREP for the period January 25, 1993, through March 25, <br />1993. The aircraft will be based at Reno, NV. A total of 75 <br /> <br />32 <br />