Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Effects of Thawing Conditions in Sample Treatment on the Chemical Properties of East Siberian Ice Wedges

동시베리아 얼음쐐기 시료의 해동방법이 시료의 화학적 특성분석에 미치는 영향

  • Subon, Ko (Department of Earth System Sciences, Yonsei University) ;
  • Jinho, Ahn (School of Earth and Environmental Sciences, Seoul National University) ;
  • Alexandre, Fedorov (Melnikov Permafrost Institute, Russian Academy of Science) ;
  • Giehyeon, Lee (Department of Earth System Sciences, Yonsei University)
  • 고수본 (연세대학교 지구시스템과학과) ;
  • 안진호 (서울대학교 지구환경과학부 ) ;
  • ;
  • 이기현 (연세대학교 지구시스템과학과)
  • Received : 2022.12.21
  • Accepted : 2022.12.26
  • Published : 2022.12.28
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Abstract

Ice wedges are subsurface ice mass structures that formed mainly by freezing precipitation with airborne dust and surrounding soil particles flowed through the active layer into the cracks growing by repeating thermal contractions in the deeper permafrost layer over time. These ice masses characteristically contain high concentrations of solutes and solids. Because of their unique properties and distribution, the possibility of harnessing ice wedges as an alternative archive for reconstructing paleoclimate and paleoenvironment has been recently suggested despite limited studies. It is imperative to preserve the physicochemical properties of the ice wedge (e.g., solute concentration, mineral particles) without any potential alteration to use it as a proxy for reconstructing the paleo-information. Thawing the ice wedge samples is prerequisite for the assessment of their physicochemical properties, during which the paleo-information could be unintentionally altered by any methodological artifact. This study examined the effect of thawing conditions and procedures on the physicochemical properties of solutes and solid particles in ice wedge samples collected from Cyuie, East Siberia. Four different thawing conditions with varying temperatures (4 and 23℃) and oxygen exposures (oxic and anoxic) for the ice wedge sample treatment were examined. Ice wedge samples thawed at 4℃ under anoxic conditions, wherein biological activity and oxidation were kept to a minimum, were set as the standard thawing conditions to which the effects of temperature and oxygen were compared. The results indicate that temperature and oxygen exposure have negligible effects on the physicochemical characteristics of the solid particles. However, the chemical features of the solution (e.g., pH, electric conductivity, alkalinity, and concentration of major cations and trace elements) at 4℃ under oxic conditions were considerably altered, compared to those measured under the standard thawing conditions. This study shows that the thawing condition of ice wedge samples can affect their chemical features and thereby the geochemical information therein for the reconstruction of the paleoclimate and/or paleoenvironment.

얼음쐐기는 영구동토 지역의 토양층에서 관찰되는 얼음체로, 형성 당시의 강수 및 토양이 유입되어 형성되며, 높은 농도의 용질 및 고체함량을 가진다. 이러한 얼음쐐기는 그 형성 및 분포적 특성으로 인해 최근 고기후 및 고환경 복원을 위한 연구에 활용될 수 있는 가능성이 제시되고, 이에 대한 연구가 제한적으로 시작되고 있다. 하지만 얼음쐐기에 포함된 용질 및 고체 혹은 광물입자들을 고기후 및 고환경 복원 프록시로 사용하기 위해서는 이들의 물리화학적 특성 보존이 필수적이다. 만약 얼음쐐기 시료의 해동과정에 의한 물리화학적 특성 변화가 야기된다면, 이를 활용한 고기후 및 고환경 해석에 오류를 야기할 수 있다. 본 연구에서는 동시베리아 쑤야(Cyuie) 지역에서 채취된 얼음쐐기를 이용하여 해동조건이 얼음쐐기 내 용질 및 고체상에 미치는 영향을 조사하였다. 쑤야(Cyuie) 지역의 얼음쐐기 시료에 대해 해동온도와 산소유무를 고려하여 네 가지 해동조건(4℃-유산소, 4℃-무산소, 23℃-유산소 혹은 23℃-무산소)에서 회수된 용액 및 고체시료의 특성을 분석하였다. 온도와 산소의 영향이 가장 제한적일 것으로 예상되는 4℃-무산소 조건에서 측정된 결과를 기준으로 비교한 결과, 얼음쐐기 내 고체입자들에 대한 해동조건의 영향은 미미하였다. 반면, 용액의 화학적 특성(pH, 전기전도도, 알칼리도와 주양이온 및 미량원소의 농도)은 기준조건에 비해 4℃-유산소 조건에서 일관성 있게 유의미한 차이를 보였다. 본 연구결과, 얼음쐐기 시료의 해동조건에 따라 시료의 화학적 특성에 변화를 야기할 수 있으며, 이는 시료처리 방법 및 절차가 얼음쐐기를 이용한 고기후 및 고환경 복원 결과에 중요한 영향을 미칠 수 있음을 시사한다.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단해양극지기초원천개발사업(과제번호 2020M1A5A1110607) 및중견연구자지원사업(과제번호 2020R1A2C2010089)의 지원을 받아 수행되었습니다. 이 연구를 수행하는 과정에서 고체분석과 관련하여 많은 도움을 주신 미국 APS 12-BM-B 빔라인의 이성식 박사님께 감사드립니다.

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