Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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A High-resolution Study of Isotopic Compositions of Precipitation

고해상도 강우동위원소변동에 대한 연구

  • Lee, Jeonghoon (Dept. of Science Education, Ewha Womans University) ;
  • Kim, Songyi (Dept. of Science Education, Ewha Womans University) ;
  • Han, Yeongcheol (Division of Climate Change, Korea Polar Research Institute) ;
  • Na, Un-Sung (Division of Climate Change, Korea Polar Research Institute) ;
  • Oh, Yoon Seok (Incheon Science High School) ;
  • Kim, Young-Hee (Dept. of Science Education, Ewha Womans University) ;
  • Kim, Hyerin (Dept. of Science Education, Ewha Womans University) ;
  • Ham, Ji-Young (Dept. of Science Education, Ewha Womans University) ;
  • Choi, Hye-Bin (Dept. of Science Education, Ewha Womans University) ;
  • Koh, Dong-Chan (Groundwater Dept., Korea Institute of Geoscience and Mineral Resources)
  • 이정훈 (이화여자대학교 과학교육과) ;
  • 김송이 (이화여자대학교 과학교육과) ;
  • 한영철 (극지연구소 기후연구부) ;
  • 나운성 (극지연구소 기후연구부) ;
  • 오윤석 (인천과학고등학교) ;
  • 김영희 (이화여자대학교 과학교육과) ;
  • 김혜린 (이화여자대학교 과학교육과) ;
  • 함지영 (이화여자대학교 과학교육과) ;
  • 최혜빈 (이화여자대학교 과학교육과) ;
  • 고동찬 (한국지질자원연구원 지하수연구실)
  • Received : 2015.02.02
  • Accepted : 2015.10.05
  • Published : 2015.10.28
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Abstract

Isotopic compositions of precipitation have been used to understand moisture transport in the atmosphere and interactions between precipitation and groundwater. Isotopic compositions of speleothems and ice cores, so called, ''paleoarchives'', can be utilized to interpret climate of the past and global circulation models (GCMs). The GCMs are able to explain the paleoarchives, can be validated by the precipitation isotopes. The developments of stable isotope analyzers make high-resolution isotopic studies feasible. Therefore, a high-resolution study of precipitation isotopes is needed. For this study, precipitation samples were collected for every 5 to 15 minutes, depending on precipitation rates, using an auto-sampler for precipitation isotopes near coastal area. The isotopic compositions of precipitation range from -5.7‰ (-40.1‰) to -10.8‰ (-74.3‰) for oxygen (hydrogen). The slope of ${\delta}^{18}O-{\delta}D$ diagram for the whole period is 6.8, but that of each storm is 5.1, 4.2, 7.9 and 7.7, respectively. It indicates that evaporation occurred during the first two storms, while the latter two storm did not experience any evaporation. The isotopic fractionations of precipitation has significant implications for the water cycle and high-resolution data of precipitation isotopes will be needed for the future studies.

강우의 산소 및 수소안정동위원소는 물순환 연구에서 수분의 이동 및 강우와 지하수계의 상호작용을 이해하는 데에 사용되어 왔다. 종유석 및 빙하의 안정동위원소를 이용하여 과거의 기후 및 기상을 이해하는 데에 이용되고 있으며, 이러한 과거지시자를 설명하기 위한 전지구순환모델의 기초자료로 이용되고 있다. 동위원소 분석기기의 발전으로 인해 이전보다 고해상도 연구가 점차 가능해 지고 있으며, 강우안정동위원소 역시 고해상도 연구에 대한 필요성이 제기되고 있다. 이번 연구에서는 해안에서 강우안정동위원소의 변동을 관찰하기 위하여 자동시료채취장치를 개발하여 강우량에 따라 5-15분 간격으로 강우시료를 채취하였다. 강우동위원소의 변동은 연구기간동안 최대 -5.7(-40.1)‰, 최소 -10.8(-74.3)‰ 값을 보였으며, 연구기간동안 강우안정동위원소의 산소와 수소의 선형관계의 기울기는 6.8이며, 이를 강우사상으로 분리하면 각각 5.1, 4.2, 7.9, 7.7이다. 이는 첫 두 강우가 내리면서 증발이 일어났음을 지시하며, 시간이 갈수록 증발이 더 이상 일어나지 않았음을 의미한다. 이러한 안정동위원소의 분화는 여러 물순환 연구에 시사하는 바가 크며, 앞으로 강우안정동위원소를 이용한 연구를 수행할 때 강우의 고해상도 분석이 필요할 것으로 판단된다.

Keywords

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