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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />radiometer was used in the 1991 UtahfNOAA Field Program. Other examples of data <br /> <br />from mobile operations appear in Appendix A. <br /> <br />Between 15 January and 15 March 1991 the spatial distribution of SLY in <br /> <br />orographic clouds over the Yasatch Plateau was studied by driving the radiometer <br /> <br />on two highways which crossed the Plateau. For safety reasons mobile operations <br /> <br />were conducted primarily during daylight hours. At times when the radiometer was <br /> <br />stationary, liquid and vapor data were collected at the Utah/NOAA high altitude <br /> <br />field site (Department of Transportation or DOT site) located on the western edge <br /> <br />of the top of the Plateau. During non-storm periods data were collected in <br /> <br />zenith-pointing mode using sample integrations of 1, 2 or 5 min. <br /> <br />Yhen the <br /> <br />radiometer was stationary during storms, usually at night, data collection <br /> <br />alternated between l-min zenith data and hourly 3600 azimuth scans taken at an <br /> <br />elevation angle of about 130. The U.S. Bureau of Reclamation (USBR) radiometer <br /> <br />was operated continuously in zenith-pointing mode at the DOT site for the entire <br /> <br />field season. <br /> <br />The data from the USBR radiometer will serve as a basis for <br /> <br />comparison when the two radiometers were collocated and when the DR! radiometer <br /> <br />was collecting data on another part of the Plateau. <br /> <br />Several different mobile radiometer routes over the Plateau were used <br /> <br />during the field season. <br /> <br />The routes are shown in Fig. 8 and described as <br /> <br />follows: <br /> <br />Route 1) Highway 31 between Fairview, Utah and the DOT site. This route <br />allowed sampling microwave emissions from clouds over the westward facing <br />(generally upwind) slope of the Wasatch Plateau where orographic lift is <br />typically maximized. <br /> <br />Route 2) Highway 31 between the DOT site and the intersection of 31 and <br />Skyline Drive about 5 miles to the south of DOT. This route allowed <br />monitoring SLY variations along the western edge of the top of the <br />Plateau. DOT was slightly downwind of a ridge and the Skyline intersec- <br />tion was at the crest of a ridge. <br /> <br />13 <br /> <br /> <br />Route 3) Highway 264 from the intersection of 264 and 31 to the Carbon <br />