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<br />~~ <br /> <br /> <br /> , <br /> -, <br /> . ., J <br />, . <br />It" _ _ .1 [J <br />~ .. - <br /> - <br /> <br />Figure 2.9. - Microwave radiometer (trailer) localed at Jackson Creek site. <br /> <br />2.7 Radnr Wind Prufiler <br /> <br />For the 1992-93 winter, 8 boundary layer radar wind profiler (Rodgers el aI., 1993) was <br />obtained for n 4-mo period from the NOAA's Environmental Research Laboratory in Boulder, <br />Colorado. The profiler was installed in Blairsden, about 5 km southeast of .Johnsville (fig. <br />2.6), The profiler is basically a Doppler radar operating at 915 MHz or 32.8 em. Three <br />separate antennas let the profiler measure both horizontal and vertical components of the <br />wind (fig. 2.10), Antenna beam widths are each 90, Therefore, the promer averages over a <br />large spatial volume. The radar has sufficient sensitivity to measure winds within 100-m <br />vertical slices from 100 m above ground up to 3000 m in clear air and up to 5000 m during <br />precipitation. At this wavelength, radar is about as sensitive to light rain as it is to changes <br />in the atmospheric index of refraction. When sampling in clear air, the profiler is tracking <br /> <br />17 <br />