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<br />ifVV <br /> <br />~v'< Section 1. - Radiometer <br /> <br />The~crowave radiometer was installed at Island Lal<e on Grand Mesa in late <br />October 1983. Coordi nates were 3900211511 N, 10-SoOO'1ifrvr-and about 10,400 ft. <br />a lt itude msl. On October 25, 1983, it began to record data. Last data were <br />~-_...--,.--. .. ,'- ...... <br />recorde~_o!l_D~c~,!!be~_ 31, !2~4~_:to the Ch!!l.!.t.. yei!J:~J:.bang~.... TipPJng curvle measur:.e- <br />mentswere made in January 1984 after which the radi ometer was moved to <br />Ca 1 i fornia::-"'-""'" .~-~.-.. .. . <br />~---,. ....~..."""'........_"-.,. <br /> <br />The instrument passively measures incoming microwave radiation at wavelengths <br />appropriate to water vapor (20.6 GHz) and to liquid water (31.6 GHz). The <br />bri ghtness of the radi at ion is a measure of the integrated water in th,at phase <br />along the line of sight. A paper by D. C. Hogg, et al., (J.C.A.M., May 1983, <br />789-806) describes the details. The beam width of the antenna is 2.50. <br /> <br />Data were recorded on magnetic tape and floppy disk for permanent storage. <br />Listings were made in real time on computer paper. Notes by the operators were <br />often made in a log book. <br /> <br />Sources of ground clutter were not mapped because the radi ometer was operated in <br />the zenith mode. <br /> <br />1-1 <br />