Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Establishment of an Ice Core Processing Method and Analytical Procedures for Fundamental Proxies

빙하코어의 전처리 방법 및 기초 프록시 분석법 확립

  • Jun, Seong Joon (Department of Ocean Sciences, College of Natural Sciences, Inha University) ;
  • Hong, Sang Bum (Korea Polar Research Institute, KIOST) ;
  • Hur, Soon Do (Korea Polar Research Institute, KIOST) ;
  • Lee, Jeonghoon (Department of Science Education, College of Education, Ewha Womans University) ;
  • Kang, Jung-Ho (Korea Polar Research Institute, KIOST) ;
  • Hwang, Hee Jin (Korea Polar Research Institute, KIOST) ;
  • Chung, Ji Woong (Korea Polar Research Institute, KIOST) ;
  • Jung, Hye Jin (Korea Polar Research Institute, KIOST) ;
  • Han, Changhee (Department of Ocean Sciences, College of Natural Sciences, Inha University) ;
  • Hong, Sungmin (Department of Ocean Sciences, College of Natural Sciences, Inha University)
  • 전성준 (인하대학교 자연과학대학 해양과학과) ;
  • 홍상범 (한국해양과학기술원 부설 극지연구소) ;
  • 허순도 (한국해양과학기술원 부설 극지연구소) ;
  • 이정훈 (이화여자대학교 사범대학 과학교육과) ;
  • 강정호 (한국해양과학기술원 부설 극지연구소) ;
  • 황희진 (한국해양과학기술원 부설 극지연구소) ;
  • 정지웅 (한국해양과학기술원 부설 극지연구소) ;
  • 정혜진 (한국해양과학기술원 부설 극지연구소) ;
  • 한창희 (인하대학교 자연과학대학 해양과학과) ;
  • 홍성민 (인하대학교 자연과학대학 해양과학과)
  • Received : 2013.12.26
  • Accepted : 2014.03.13
  • Published : 2014.03.30
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Abstract

We established the first complete ice core processing method and analytical procedures for fundamental proxies, using a 40.2 m long ice core drilled on the Mt. Tsambagarav glacier in the Mongolian Altai mountains in July 2008. The whole core was first divided into two sub ice core sections and the measurements of the visual stratigraphy and electrical conductivity were performed on the surface of these sub core sections. A continuous sequence of samples was then prepared for chemical analyses (stable isotope ratios of oxygen ($^{18}O/^{16}O$) and hydrogen ($^2H/^1H$), soluble ions and trace elements). A total of 29 insoluble dust layers were identified from the measurement of visual stratigraphy. The electrical conductivity measurement (ECM) shows 11 peaks with the current more than 0.8 ${\mu}A$ Comparing the profiles of $SO_4{^{2-}}$ and $Cl^-$ concentrations to correlate with known volcanic eruptions, the first two ECM peaks appear to be linked to the eruptions (January and June 2007) of Kliuchevskoi volcano on the Kamchatka Peninsula of Russia, which supports the reliability of our ECM data. Finally, the composition of stable isotopes (${\delta}^{18}O$ and ${\delta}D$) shows a well-defined seasonal variation, suggesting that various chemical proxies may have been well preserved in the successive ice layers of Tsambagarav ice core. Our ice core processing method and analytical procedures for fundamental proxies are expected to be used for paleoclimate and paleoenvironmental studies from polar and alpine ice cores.

본 연구에서는 선진국형의 종합적인 빙하코어 연구를 수행하기 위해서 요구되는 빙하시료 전처리 방법 설정과 기초 프록시 분석 기술을 확립하였다. 빙하코어 시료는 2008년 6월에 국제공동으로 몽골 알타이 산맥의 참바가라브산에서 시추한 40.2 m 길이의 빙하코어를 활용하였다. 빙하코어의 기초 프록시인 시각적 층위구분과 ECM 측정은 1차 절삭한 빙하코어의 절단면에서 수행하였으며, 2차 절삭과정을 통해 물 안정동위원소 분석용 시료 1,935개와 화학적 프록시 분석을 위한 시료 374개를 확보하였다. 전체 빙하코어의 시각적 층위구분 결과 총 29개의 불용성 입자층이 관찰되었으며, ECM 측정으로 11개의 ECM 신호 피크를 찾아냈다. 극지연구소에서 제작한 용융장치를 활용하여 분석한 $SO_4{^{2-}}$ 및 $Cl^-$의 농도와 상부 0.7 m와 1.2 m 깊이의 ECM 신호 피크의 비교 결과는 이들 ECM 신호 피크가 러시아 캄차카반도의 Kliuchevskoi 화산 분출과 연관된 것을 보여준다. 이러한 결과는 극지연구소에서 자체 제작한 ECM 측정 시스템으로 분석한 ECM 자료의 신뢰성이 높다는 것을 나타낸다. 마지막으로 참바가라브 빙하코어의 상부 5 m에서 분석한 물 안정동위원소비의 변화는 뚜렷한 계절 주기성을 보이고 있고, 이 결과는 참바가라브 빙하코어의 화학적 프록시 기록이 후퇴적과정에 의해 크게 교란되지 않았다는 것을 지시한다. 본 연구에서 확립한 빙하시료 전처리 방법 설정과 기초 프록시 분석 기술은 앞으로 우리나라가 독자적으로 남북극 및 고산지역에서 시추하는 빙하코어에 적용하여 다양한 고기후 및 고환경 연구에 활용될 것이다.

Keywords

References

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