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Last modified
7/28/2009 2:35:13 PM
Creation date
4/15/2008 2:38:48 PM
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Weather Modification
Title
Weather Modification Programme - Catalogue of Data Sets for the International Cloud Modelling Workshop/Conference
Date
6/1/1984
Weather Modification - Doc Type
Report
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<br />Two aircraft missions were conducted. Each involved three aircraft: a cloud <br />base observation aircraft, a mid-level cloud physics aircraft, and a top-side <br />cloud physics/seeding aircraft. The first mission dealt with an isolated cumu- <br />lus congest us between 2200 and 2300 GMT. The second mission involved the line <br />of thunderstorms moving through the project area from 0000 to 0200 GMT (July 4, <br />1979). The first mission consisted of sampling only, while the later one <br />involved both seeding and sampling (Jurica et al., 1981). Riggio et al. (1982) <br />describe the Texas HIPLEX program, types of data available, and general cloud <br />and precipitation properties. <br /> <br />3.1.1.1.3 Continental (all ice) <br /> <br />A. CCOPE - July 19, 1981 <br /> <br />This CCOPE case was selected for the model analyses of mlxlng processes and ice <br />phase precipitation growth because of its exceptionally complete documentation <br />of the evolution of a simple cumulus congestus cloud. This case is the focus of <br />a number of ongoing studies and will provide an excellent forum for exchange of <br />modeling and observational insights regarding the development of precipitation <br />by the Bergeron process. <br /> <br />A goal of the CCOPE experimental plan was to acquire measurements from the <br />explorer sailplane while powered aircraft monitored fixed levels in the cloud. <br />However, suitable measurements were gathered in only one cloud, that of July 19 <br />(2215-2250l). This case has been described by Jones et a1. (1983). Some of the <br />studies that are part of the ongoing case study of that cloud are the following: <br /> <br />1. General weather conditions favored widespread release of instability <br />without organization into persistent storms. The cloud appearance and time <br />history of the cloud top and radar development have been reviewed. <br /> <br />2. Instrumentation problems have been studied, especially as they relate to <br />the measurement of liquid water content. <br /> <br />3. Precipitation mechanisms have been examined in a preliminary manner. The <br />droplet spectra are not conducive to and do not show evidence of coalescence. <br />The primary precipitation process is the accretional growth of ice. <br /> <br />4. Ice concentrations and ice origins have been surveyed. The measurements <br />indicate that ice crystals originated in mixed regions of the cloud and that <br />only low concentrations of ice were nucleated in regions without substantial <br />mixing. Representative concentrations of ice were: less than O.I/L at -12 <br />oC, and 5/L at -18 to -20 oC. <br /> <br />5. Limited evidence indicates that secondary ice production processes were <br />active in a region with temperature of about -15 oC. <br /> <br />6. The time required for formation of graupel matches well a calculation of <br />expected growth, although the observations can only be regarded as an upper <br />limit to the time required. <br /> <br />12. <br />
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