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<br />OAr.:: ',,.. <br />0' .;;) JJ <br /> <br />factor from convective storms under a phased introduction of new <br />components into an existing radar system. The total radar was <br />operated during the 1976 HIPLEX research project in Texas and pro- <br />vided data for analyzing storm characteristics and for developing the <br />HIPLEX cloud climatology. <br /> <br />Digital scan autocontrol, digital data acquisition systems, and video <br />time-lapse recording were implemented. A central data acquisition/ <br />control facility was created. Capabilities of the reconfigured <br />system include antenna-slaved dual-wavelength measurements at 10 cm <br />and 3 cm, contoured range-normalized displays, and programmable scan <br />sequencing. <br /> <br />CONTRACTOR: University of Washington, Seattle, Washington <br />CONTRACT NO. 14-06-0-7664 <br />PRINCIPAL INVESTIGATOR: Peter V. Hobbs <br />PERIOD: May 1, 1975, to December 1, 1976 <br />FUNDING: FY75 - $30,296 <br />FY76 - $90,888 <br /> <br />The contract objective was to conduct aerosol survey studies in <br />connection with HIPLEX. Surveys were conducted over the entire <br />High,Plains region between Miles City, Montana, and Big Spring, <br />Texas, to study the number of natural nuclei in the air. It was <br />found that aerosol concentrations are dependent upon airmass type, <br />source proximity, and aerosol size and type. Aerosol size distribu- <br />tions were bimodal in nature. Concentrations were lowest in and near <br />precipitation areas, and salt particles were found only in strong <br />southerly flows. High concentrations of both condensation and ice <br />nuclei were found near dust storms. The study provided explicit <br />information on the natural aerosol background to which cloud seeding <br />agents may be introduced. <br /> <br />CONTRACTOR: Western Scientific Services, Inc., Fort Collins, <br />Colorado <br />CONTRACT NO. 14-06-0-7665 <br />PRINCIPAL INVESTIGATOR: Curtis Hartzell <br />PERIOD: May 15, 1975, to February 28, 1978 <br />FUNDING: FY75 - $10,193 <br />FY76 - $43,896 <br />T.Q. - $29,293 <br />FY77 - $76,959 <br />FY78 - $ 7,092 <br /> <br />The contractor provided meteorological support services <br />1975-77 field seasons at the Miles City, Montana HIPLEX <br />servi~es consisted of operating rawinsonde equipment to <br /> <br />during <br />site. <br />obt ai n <br /> <br />the <br />These <br /> <br />III-18 <br />