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<br />measured by the radiometers. <br />The DR! radiometer experienced problems in a 20 GHz power supply and in a <br />temperature control board. Both problems generally appeared when the radiometer was changed <br />from stationary to mobile operation, with the symptom being a sudden large change in vapor <br />depth.. The problem was corrected through the use of variable calibration factors in the post- <br />season processing of the data. A specific calibration factor was chosen to produce a zero offset <br />in the liquid data (when no clouds were present), and to produce water vapor depths that were <br />comparable to the closest Mt. Pleasant sounding. Because the problem was in the 20 GHz <br />circuitry the vapor data were affected the most. In fact, as noted below, liquid data were <br />affected very little. Because of the lack of a good comparative standard for water vapor, the <br />DR! vapor data for much of the 1991 season had much higher uncertainty than the USBR data, <br />and for this reason were not used in any quantitative studies. <br /> <br />Table 2.1. Atmospheric retrieval coefficienfs computed from soundings taken <br />at the following locations during winter. Liquid and vapor coemcienfs are <br />shown for the 1991 Utah/NOAA project. Only liquid coemcienfs cll, cl2, and <br />c13 are shown for other IJrojecfs. <br />Location Year Height (m) Coetr. Coetr. Coetr. Coeff. <br /> (Type) 1 2 3 <br />Utah (Mt. 1991 2698 Vapor' 0.019455 28.746 -12.770 <br />Pleasant) evl.2,3 <br /> Liquid -.008335 .006449 .43280 <br /> ell ,2,3 <br />Utah 1987 2590 ell ,2,3 -.00997 .0066826 .39067 <br />(Beaver) <br />California 1985-87 1859 ell ,2,3 -.01465 -.121290 .54341 <br />(Kingvale) <br />Colorado 1980's 1609 ell ,2,3 -.00936 -.16252 .49458 <br />(Denver) <br />Australia 1988 1458 ell ,2,3 -.01027 -.231150 .61235 <br />Australia 1990 1200 ell ,2,3 -.00903 -.264450 .62306 <br />California 1983 120 ell ,2,3 -.01716 -.33190 .49458 <br /> <br />The conversion of brightness temperature data at 20.6 and 31.65 GHz to absorption, and <br />eventually to values of integrated liquid and water vapor depth followed the statistical retrieval <br />technique described by Hogg et al. (1983). The retrieval coefficients were computed using the <br /> <br />2-3 <br /> <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 />