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<br />Page 11 <br /> <br />Near real-time data from the radiometer will be available through <br />the Bureau's PROBE system, described later. <br /> <br />The radiometer is housed in a transportable van and will be <br />located at the Happy Jack Ranger Station site (see fig. 1) near <br />the top of the west (windward) slope of the Mogollon Rim. This <br />site should be under the end of the SLW production zone for <br />westerly flow, and just upwind of the lee subsidence ZOnE!. <br />Measurements there should provide good estimates of the amount of <br />SLW not naturally utilized as precipitation before entering <br />downslope flow with associated evaporation. <br /> <br />The radiometer is scheduled to arrive on January 12, 19Bi' for <br />installation at the Happy Jack site. As soon as initial testing <br />is completed, the unit will be operated continuously in a <br />vertical pointing mode until the end of the field season. <br />Exceptions to this will be during maintainence or the <br />approximately weekly "tipping curve" calibrations. This method <br />p rovi des updates of some of the coeffi ci ents used in the computer <br />software that can change due to gradual shifts in atmospheric <br />characteristics and electronic component drift. Tipping curves <br />can only be made in cloud-free or totally ice-cloud conditions. <br />Table 2 lists the characteristics of the radiometer system. <br />