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Diatom Succession Representing the Paleoclimatic Change from Laminated Sediments around Antarctica

남극 엽층리 퇴적물로부터 규조 종을 이용한 고기후 변화 연구

  • Bak, Young-Suk (Department of Earth and Environmental Sciences, Chonbuk National University) ;
  • Yoon, Ho Il (Korea Polar Research Institute) ;
  • Yoo, Kyu-Cheul (Korea Polar Research Institute) ;
  • Lee, Young-Up (Department of Earth and Environmental Sciences, Chonbuk National University)
  • 박영숙 (전북대학교 자연과학대학 지구환경과학과) ;
  • 윤호일 (한국해양연구원 부설 극지연구소 극지기후연구센터) ;
  • 유규철 (한국해양연구원 부설 극지연구소 극지기후연구센터) ;
  • 이영엽 (전북대학교 자연과학대학 지구환경과학과)
  • Received : 2015.04.13
  • Accepted : 2015.04.28
  • Published : 2015.04.30
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Abstract

This study investigated the paleoclimatic change using diatoms that were extracted from the high-resolution laminated layers of diatom ooze sediment cores GC08-EB01 in the eastern basin of the Bransfield Strait, Antarctica. The range of diatom valves per gram of dry sediment was from $0.4-4.2{\times}10^8g^{-1}$ in quantitative diatom assemblage analysis. Laminations are classified using visually dominant diatom species and terrigenous content. Biogenic diatom ooze laminae characterised by bloom of Corethron crilophilum, Eucampia antarctica, Fragilariopsis curta, F. kerguelensis, Odontella weissflogii, Proboscia inermis, R. styliformis, Thalassiosira antarctica, and Chaetoceros resting spores. Terrigenous laminae characterised by mixed diatom assemblage. The ratio of (Fragilariopsis curta+F. cylindrus)/Thalassiosira antarctica increase in horizons, suggesting increased sea-ice cover in the study area during the late Holocene (cold events). As a result, five cold events are identified on the basis of frequency of the critical taxa throughout the section.

남극 브랜스필드 해협의 동부분지로부터 획득한 GC08-EB01 코어퇴적물의 고해상 엽층리로부터 규조를 이용하여 고기후변화를 연구하였다. 규조 정량 분석의 결과 규조 개체수 농도는 $0.4-4.2{\times}10^8g^{-1}$로 매우 풍부하게 산출되었으며, 엽층리는 생물기원의 규조가 풍부한 층과 육성기원 퇴적물이 풍부한 층으로 구분된다. 규조 엽층리는 Corethron crilophilum, Eucampia antarctica, Fragilariopsis curta, F. kerguelensis, Odontella weissflogii, Proboscia inermis, R. styliformis, Thalassiosira antarctica와 Chaetoceros resting spores 등의 번성이 특징적이며, 육원성 엽층리에서는 규조 군집이 혼합되어 나타나는 것이 특징이다. 홀로세 후기 동안 Fragilariopsis curta+F. cylindrus)/Thalassiosira antarctica의 산출 수직 분포비가 급격히 증가하는 구간은 해빙의 확장을 지시하며, 연구 코어 GC08-EB01 코어퇴적물이 퇴적되는 동안 적어도 5번의 한랭기가 있었음을 알려준다.

Keywords

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