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Applications of Cryogenic Method to Water Vapor Sampling from Ambient Air for Isotopes Analysis

수증기 동위원소 측정을 위한 저온채집법에 대한 연구

  • Kim, Songyi (Department of Science Education, College of Education, Ewha Womans University) ;
  • Han, Yeongcheol (Division of Paleoenvironment, Korea Polar Research Institute, KIOST) ;
  • Hur, Soon-Do (Division of Paleoenvironment, Korea Polar Research Institute, KIOST) ;
  • Lee, Jeonghoon (Department of Science Education, College of Education, Ewha Womans University)
  • 김송이 (이화여자대학교 사범대학 과학교육과) ;
  • 한영철 (한국해양과학기술원 부설 극지연구소 극지고환경연구부) ;
  • 허순도 (한국해양과학기술원 부설 극지연구소 극지고환경연구부) ;
  • 이정훈 (이화여자대학교 사범대학 과학교육과)
  • Received : 2016.08.03
  • Accepted : 2016.12.16
  • Published : 2016.12.30

Abstract

Stable water vapor isotopes have been utilized as a tracer for studying atmospheric global circulations, climate change and paleoclimate with ice cores. Recently, since laser spectroscopy has been available, water vapor isotopes can be measured more precisely and continuously. Studies of water vapor isotopes have been conducted over the world, but it is the early stage in south Korea. For vapor isotopes study, a cryogenic sampling device for water vapor isotopes has been developed. The cryogenic sampling device consists of the dewar bottle, filled with extremely low temperature material and impinger connected with a vacuum pump. Impinger stays put in the dewar bottle to change the water vapor which passes through the inside of impinger into the solid phase as ice. The fact that water vapor has not sampled completely leads to isotopic fractionation in the impinger. To minimize the isotopic fractionation during sampling water vapor, we have tested the method using a serial connection with two sets of impinger device in the laboratory. We trapped 98.02% of water vapor in the first trap and the isotopic difference of the trapped water vapor between two impinger were about 20‰ and 6‰ for hydrogen and oxygen, respectively. Considering the amount of water vapor trapped in each impinger, the isotopic differences for hydrogen and oxygen were 0.33‰ and 0.06‰, respectively, which is significantly smaller than the precision of isotopic measurements. This work can conclude that there is no significant fractionation during water vapor trapping.

Keywords

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