COMPARISON OF AEROLOGICAL DATA MEASURED BY MEANS OF RS2-91 RAWINSONDE AND RS2-80 RAWINSONDE AT SYOWA STATION, ANTARCTICA

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The RS2-91 rawinsonde system replaced the RS2-80 rawinsonde system on January 1,1995 for upper-air observations at Syowa Station, Antarctica. In order to determine the properties of RS2-91 and RS2-80,a total of 45 flights were carried out with the two types of link radiosondes at Syowa Station, from December 1994 to September 1995. The RS2-80 rawinsonde consists of a rod thermistor painted in white, a carbon hygristor and a baroswitch aneroid capsule for measuring temperature, humidity and pressure, respectively. The RS2-91 rawinsonde consists of a rod thermistor coated with vacuum-evaporated aluminum, a thin capacitor film and a capacitive aneroid capsule, respectively. The solar radiation correction is applied for air temperature measurements with both the RS2-91 and RS2-80. The differences of temperatures measured at standard pressure levels were within approximately ±1.5℃ in the stratosphere during this period. The characteristic tendencies are as follows. In the stratosphere in the daytime, the temperatures measured by RS2-91 were lower than those measured by RS2-80 in the winter, under low temperature conditions (below -80℃). In the fall (approximately -50℃), however, those measured by RS2-91 were higher than those measured by RS2-80.
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