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<br />conditions. <br /> <br />The field measurements necessary to deal with seeding hypotheses G] -G5 include some or all of the <br />following. <br /> <br />MI. Assess SL W over the mountain barrier with radiometers and/or icing rate meters. <br /> <br />M2. Measure propane gas dispenser flow rate and nozzle temperature. Measure AgI <br />generator solution flow rate and flame temperature. Automatically telemeter <br />measurements via radio to a central monitoring site. <br /> <br />M3. Measure ambient temperature, humidity and winds at seeding device locations and at <br />other selected locations ofthe mountain barriers. Telemeter measurements via radio to <br />the central monitoring site. <br /> <br />M4. Estimate transport and diffusion of the seeding created ice particles with mobile <br />detectors mounted on a four-wheel drive vehicle, at the Storm Peak Laboratory, and <br />possibly one other fixed location in the Medicine Bow Mountains. Measuring devices <br />may include 2D probes, ice nucleus counters, tracer gas detectors, and a cloud droplet <br />measuring device (FSSP). Other equipment may include (optional) scanning Doppler <br />radar for assessing winds to and from the radar and precipitation, and a radar profiler to <br />monitor the vertical distribution of horizontal winds and virtual temperature. <br /> <br />M5. Measure precipitation with high resolution gauges with specifications to resolve to within <br />five minutes and 0.1 millimeters of water equivalent. Gauge spacing will be determined <br />during the project design phase. <br /> <br />M6. Periodically sample snow particles at selected precipitation gauge sites using a radio- <br />controlled sampler and/or automated photography. Periodically collect samples and <br />analyze later for silver and/or indium concentrations. <br /> <br />The Storm Peak Laboratory, located at the high altitude of 10,520 feet, is equipped for collecting typical <br />weather information plus data on aerosols and some cloud physics variables (intermittently) such as cloud <br />liquid water presence. <br /> <br />3.5. Field Instrumentation <br /> <br />The instrumentation systems necessary to conduct assessments M1-M6 are listed in table 3.1. Some of <br />the instrumentation such as doppler radar will contribute observations only if provided by a partnering <br />agency. The outcome of design phase studies will determine what equipment is appropriate for the <br />operational seeding phase in the Headwaters Region. <br /> <br />Table 3.1. - Instrumentation options for the design phase (see appendix A for a description of <br />sensors). <br /> <br />]. Three microwave radiometers for vertically integrated SL W observations. <br />2. Tower-mounted icing rate meters for surface SL W observations. <br />3. Rawinsonde system for vertical profiles of wind, temperature, and moisture. <br />4. Automatic weather stations for surface wind, temperature, and humidity fields. <br /> <br />11 <br />