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<br />I <br />I <br />1 <br />I <br />I <br />I <br />t <br />I <br />I <br />I <br />I <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3) Examine the airflow patterns and associated transport <br />and dispersion (T and D) of tracing material over <br />and around the orographic barriers for the purpose <br />of assessing various cloud seeding delivery techniques. <br />(No actual cloud seeding was done during the exploratory <br />program). <br /> <br />Several sophisticated instrumentation systems were required <br />to meet the stated objectives. Their specifications and opera- <br />tional procedures are described in a subsequent section but, <br />briefly, they included: <br /> <br />1) A high performance aircraft, capable of sustaining <br />flight in SLW cloud with complete state and microphysical <br />sensors and a wind monitoring system. A detection <br />system for a gas tracer material was also included. <br /> <br />2) A microwave radiometer to passively monitor the <br />vertically integrated amounts of SLW and water vapor. <br /> <br />3) A rawinsonde system to measure the vertical structure <br />of winds, temperature and relative humidity. <br /> <br />4) A C-band (5 cm) radar to observe cloud base, top <br />and structure. <br /> <br />5) An acoustical sounding system to monitor horizontal <br />winds in the lowest 1000-2000 feet (300-600) meters) <br />above the high plateau. <br /> <br />6) A portable sulfur hexafluoride tracer gas (SF6) <br />release system which was used at various high altitude <br /> <br />2-4 <br />