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<br />Section 1. - Radiometer <br /> <br />. <br /> <br />The DARR microwave radiometer was installed at Island Lake on Grand Mesa on 15 <br />October 1985. Coordinates were: 390 02115" N latitude, 1080 00117" W longitude. <br />Elevation was 10,400 feet above sea level. The unit was operated in a zenith- <br />-Roi ~~!-'!~L modeHI1~JL.J9 Nov~l1!b.~r,_ \"!hen ~~~i t was ~ 1 ~cedi n-a-v~rtl~al D~ <br />scannl n_R_I!lQ.Q~ & lo_n.g~J..~g3J5-1~5__~e9.ree aZlmutlTji;--Ml mmum e 1 evatl on 1 n the <br />scanning modes was 23 degrees, to stay well above ground clutter. <br /> <br />Operation of the unit in a scanning mode proved to be a difficult task, as the <br />PDP-l1 computer frequently suffered from hardware and/or software problems, <br />and many hours of data were collected with the antenna frozen at a given <br />elevation angle. Hence, data listed in Table 1-1 as "scanning" may at times <br />be stat i onary. <br /> <br />The instrument passively measures incoming microwave radiation at wave-lengths <br />appropriate to water vapor (20.6 GHz) and liquid water (31.6 GHz). The <br />brightness of the radiation is a measure of the integrated water liquid and <br />vapor along the line of sight. A paper by D. C. Hogg, et al., (JCAM, May <br />1983, 789-806) describes the theory and design of the instrument in detail. <br />The beam width of the antenna is 2.5 degrees. Data were recorded on magnetic <br />tape for permanent storage. Data col.!~c:tion _\tIClL~~rmill~t~~_<!~ 11 De~embe! <br />1985, J~.~!!!!t!J.9-~hi pmen~_Q>Lthe uni t.to_.Ca 1 i forni a for use in tHe Si erra <br />Cooperative Pilot-Project. <br /> <br />1-1 <br /> <br />