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<br />A Rosemount icing detector will monitor SLW at about 8 m AGL where a heated anemometer and vane will <br />also be mounted. The anemometer will be near the 2D-C probe and its measurement of wind speed will be <br />used to calculate the probe's strobe rate. <br /> <br />A propane-fueled generator will provide electrical power. <br /> <br />A small trailer in a protected clearing in the forest about 110 m north of TAR will be used for ice crystal <br />photography at 10 min intervals. Accumulated snow will be sampled in the protected clearing at 3O-min <br />intervals for later analysis of silver-in-snow concentrations. Samples taken during propane seeding <br />experiments will establish the natural silver-in-snow background. <br /> <br />3.7 Doppler Acoustic Sounder <br /> <br />Reclamation's Doppler acoustic sounder will be operated about 2 km northeast of RRS at an elevation of <br />2900 m. It will monitor horizontal winds in 30 m intervals from the Plateau top to as high as 600 m above it, <br />depending upon conditions. This site is somewhat protected by upwind terrain so that local wind noise <br />caused by the sounder's structure should be reduced, improving signal quality. Average winds for each 30 m <br />layer will be calculated for 0.5 h intervals. A nearby trailer will house the system's electronics and a <br />computer for data display and storage. A small propane-powered generator will provide electrical power. <br /> <br />3.8 Precipitation Gauge Network <br /> <br />A network of 9 Belfort weighing precipitation gauges will provide snowfall rate measurements at the TAR, <br />about 3 Ian crosswind of the TAR to the north-northwest and south-southeast, about 3 Ian downwind (and <br />downslope) of the TAR, and at two sites between the RRS and the TAR (see Fig. 1). In addition, control <br />gauges will be operated about 8 km north of the RRS (this site will sometimes be contaminated by seeding), <br />and at two sites several kilometers south of the TAR. All gauges will be sited in protected clearings in the <br />conifer forest to reduce wind errors. In addition, gauges will be equipped with Alter-type wind shields and <br />will use twice-standard-area orifices to provide a precipitation resolution near 0.13 mm. <br /> <br />The observations from the precipitation gauge network will be used to estimate possible changes in snowfall <br />rate during seeding experiments. Such estimates will be most meaningful for experiments conducted during <br />very limited natural snowfall. Estimates of seeding effects are expected to be difficult to accomplish when <br />natural snowfall is moderate to heavy and/or has large temporal and spatial distributions during the course <br />of an experiment. , <br /> <br />3.9 Rawinsonde Site <br /> <br />An RD-65A rawinsonde system will be operated at the Mount Pleasant Airport. Rawinsonde launches will <br />be made in support of aircraft missions but not at other times. It is planned to make two launches per <br />mission, near the beginning and end of each aircraft sampling period. <br /> <br />A time-lapse video camera will be operated at the rawinsonde site to monitor daytime cloud characteristics <br />and cloud base elevation over the experimental area. The camera will monitor cloud conditions over the <br />Plateau in the vicinity of the two high altitude seeding sites. Strobe lights at the high altitude seeding sites <br />may provide nighttime information on whether cloud base is above or below these sites. <br /> <br />7 <br />