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In order to measure the concentrations of trace gases such as C02, CH4, N20 and halocarbons and the isotopic ratios of 513C, 5180 and A14C of CO2 in the stratosphere over Antarctica in January 1998, a balloon-borne cryogenic air sampling system was developed on the basis of the sampler which has used for the collection of stratospheric air over Japan since 1985. The sampler developed in this study is capable of collecting air samples with volumes of 20-30 lsTp at 12 height levels. Specialdoi:10.5636/jgg.48.1145 fatcat:scnyueislreoli64jn5gpfoxj4