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<br />I <br /> <br />I <br /> <br />County Line about 12 miles to the east. This route was used to measure <br />SLW changes across the top of the Plateau where orographic lift is <br />minimal. <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />Table 1 documents periods of mobile radiometer data collection and periods when <br /> <br />scans were taken at the DOT site. At all other times, except 16-22 February when <br /> <br />the radiometer was inoperative, data were collected in zenith mode at the DOT <br /> <br />site. <br /> <br />Data Editinll and Processinll: In general the DRI mobile radiometer operated <br /> <br />well, but there were some problems which resulted in data loss and other problems <br /> <br />which will necessitate careful editing of some portions of the data. The longest <br /> <br />period of data loss occurred between 16 and 22 February, a result of wires to the <br /> <br />'-~-~-_..- .-. <br /> <br />I <br />I <br />I <br />I <br /> <br />spinning reflector being torn apart during scanning operations. This ~~ssing <br /> <br />data period included part of the significant storm event on 16-18 February. <br /> <br />Prior to 1 February there was a temperature control problem in the <br /> <br />radiometer cabin which resulted in fluctuations in the receiver box temperature. <br /> <br />It was found that the 20 GHz channel data voltages closely followed the box <br /> <br />temperature fluctuations. It appears that one of two corrections can be applied <br /> <br />to the data affected by this problem. The data can be averaged over periods <br /> <br />I <br /> <br />significantly longer than the period of the temperature fluctuation, since the <br /> <br />temperature oscillated about the correct box temperature. Or, individual data <br /> <br />I <br /> <br />points can be corrected by an algorithm which relates box temperature to 20 GHz <br /> <br />I <br /> <br />channel voltage. Data from the 30 GHz channel were affected by this problem to <br /> <br />a lesser degree, and may require little or no editing. Installation of a new <br /> <br />I <br /> <br />temperature controller on 1 February solved the temperature fluctuation problem. <br /> <br />During the period from 10 to 14 March it was noted that the data voltages <br /> <br />I <br />I <br /> <br />in the 20 GHz channel occasionally shifted suddenly by amounts which translated <br /> <br />to vapor changes on the order of 0.2 to 0.5 em. This shift was most commonly <br /> <br />15 <br /> <br /> <br />I <br />I <br />