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<br />Following the field season the soundings were thoroughly edited and an archived <br />data set was produced. Table 1 lists each 1994 sounding by date and time, and details <br />specific editing that was done to the raw data files. Numerous soundings had errors in <br />wind data that were related to an intermittent malfunction of the antenna elevation control. <br />Appendix A contains all edited 1994 soundings plotted in Skew T - Log P format and <br />tables of precipitable water vapor computed upward from the heights of RAW and RRS. <br /> <br />D. Mobile Radiometer Operations <br />The ORI mobile microwave radiometer was operated during the 1994 NOAA/Utah <br />field program from 14 January through 8 February, and from 1 through 16 March. On <br />9 February the data collection computer and the analog-to-digital (NO) module failed, <br />and the radiometer was returned to ORI in Reno for repairs. The NO module had to be <br />fabricated at the factory and resulted in a two week delay in the repair process. <br />Following the repairs the unit was returned to the field, but only marginal weather <br />conditions existed in the project area during March. <br />Microwave radiometer operation has been described previously by Hogg et al. <br />(1983), including the use of statistical retrieval methods to arrive at integrated values of <br />liquid and vapor depth from measurements of brightness temperatures at 20.6 and 31.65 <br />GHz. Huggins (1994) describes the first use of a ground-based mobile radiometer <br />during the 1991 NOAA/Utah field program. Since that time the instrument has been <br />upgraded to include the recording of Global Positioning System (GPS) data, so the three- <br />dimensional position of the radiometer is always known. The altitude data has greater <br />uncertainty than the horizontal position data, and altitudes will therefore need to be <br />checked and possibly corrected for each mobile radiometer experiment. <br />Mt. Pleasant soundings were analyzed using the technique of Schroeder and <br />Westwater (1991) to determine the radiometer atmospheric retrieval coefficients to be <br />used for 1994 data. Initially, the 1994 soundings were analyzed from two base altitudes; <br />the height of the sounding site (RAW) at 1784 m and the top of the Plateau at 2982 m. <br /> <br />5 <br /> <br />Ii <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 />