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<br />... <br /> <br />-,-- <br /> <br />:. <br /> <br />I <br />L <br /> <br />r- <br /> <br />i <br />, <br />. 0 <br /> <br />i. <br /> <br />, <br />1 <br />I <br />I.. <br /> <br />... <br /> <br />:. <br /> <br />and direction in the lowest 600 m using 30m range gates. The data was processed by <br />taking 15 minute averages of the wind values in each bin. An aspirated Particle Measuring <br />Systems (PMS), Inc. 2D-C optical array probe was operated at the Happy Jack site about <br />100m from the radar ~d radiometer to provide images of cloud and precipitation particles <br />during storm. events. It was operated in a continuous mode during all storm. episodes. It <br />should be noted that problems were encountered with the instrument due to the shattering <br />of particles as they were sucked in a cone before entering the laser beam. The 2DC-probe <br />also has limitations to count large snow flakes due to its restricted size range. Additional <br />meteorological instruments were available to provide the normal surface meteorological <br />parameters (wind speed and direction, pressure, temperature etc.). <br /> <br />An instrumented cloud physics research aircraft was operated to obtain in cloud <br />microphysical measurements during the 1987 winter season. The aircraft, a Beechcrait <br />King Air 200T turboprop, owned and operated by the University of Wyoming, was in <br />addition to its normal set of cloud physics instrumentation (Super et al., 1989), equipped <br />with a SF. detector system. It should be noted that serious problems were encoutered <br />with the Forward Scattering Spectrometer Probe (FSSP) which m~asures th~ size spectra <br />of cloud droplets. Data from this instrument could, therefore, not be used in the <br />analyses. Apart from the microphysical missions the aircraft also flew several transport and <br />dispersion missions to study the honzonal and vertical transport and dispersion of surface <br />releases of SF. tracer gas. Chapter three will present compansons between the measured <br />and simulated plumes using a three-dimensional time-dependent numerical model. At the <br />start and end of every mission an aircraft sounding of the vertical profile of temperature, <br />dewpoint, wind speed and direction was obtained. <br /> <br />A rawinsonde tracking station was located at Camp Verde situated in a valley just <br />upwind from the Mogollon Rim. Rawinsondes were routinely made at 0500 and 1700hMST. Additional releases were frequently made during storm episodes. Rawinsonde data <br />from the NWS (National Weather Service) stations at Tuscon and W"1D.8low (released at <br />standard times) were also available to the project. Pibal balloons were launched early in <br />the morning and in the late afternoon at Happy Jack to provide wind data and to give an <br /> <br />24 <br />