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<br />Section 1. - RADIOMETER <br /> <br />The Utah State University micrOl'lave radiometer was installed at Island Lake <br />on Grand Mesa in November 1984.. Coordi nates were 39002115" N, 108000'1]11 W <br />and about 10,400 ft. altitude n~l. On December 31, 1984, it began to <br />record valid data. Last data ~~re recorded in May 1985, during an inter- <br />comparison with the DARR unit. Tipping curve measurements were made <br />throughout the season and showed drifts in the calibration constants. <br /> <br />The instrument passively measur'E~S incoming microwave radiation at wave7 <br />lengths appropriate to water vapor (20.6 GHz) and to liquid water (31.6 <br />GHz). The brightness of the ra.diation is a measure of the integrated water <br />in that phase along the line of sight. A paper by D.C. Hogg, et al., <br />(JCAM, May 1983, 789-806) describes the details. The beam width of the <br />antenna is 2.50. Data were recorded on magnetic tape and paper tape for <br />permanent storage. Sources of !~round clutter were not mapped because the <br />radiometer was operated in the zenith mode. Some data were recorded on <br />paper only. These wi 11 be ente!I"ed onto computer fi 1 es by approxi mately May <br />31, 1985. <br /> <br />Complete data records will be iilvailable on magnetic tape by approximately <br />June 15, 1985. <br /> <br />1-1 <br />