Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Variations of Biogenic Components in the Region off the Lutzow-Holm Bay, East Antarctica during the Last 700 Kyr

지난 70만 년 동안 동남극 Lutzow-Holm만 주변 해역의 생물기원 퇴적물 함량 변화

  • Kim, Yeo-Hun (Department of Oceanography, College of Natural Science Pusan National University) ;
  • Katsuki, Kota (Center for Advanced Marine Core Research Center, Kochi University) ;
  • Suganuma, Yusuke (National Institute of Polar Research) ;
  • Ikehara, Minoru (Center for Advanced Marine Core Research Center, Kochi University) ;
  • Khim, Boo-Keun (Department of Oceanography, College of Natural Science Pusan National University)
  • 김여훈 (부산대학교 자연과학대학 지구환경시스템학부) ;
  • ;
  • ;
  • ;
  • 김부근 (부산대학교 자연과학대학 지구환경시스템학부)
  • Received : 2011.03.11
  • Accepted : 2011.07.01
  • Published : 2011.09.30
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Abstract

Contents of biogenic components [opal, $CaCO_3$, TOC (total organic carbon)] were measured in Core LHB-3PC sediments collected off Lutzow-Holm Bay, in order to understand glacial-interglacial cyclic variation of the high-latitude surface-water paleoproductivity, in the Indian Sector of the Southern Ocean. An age model was established from the correlation of ARM/IRM ratios of Core LHB-3PC with LR04 stack benthic ${\delta}^{18}O$ records, in complement with radiocarbon isotope ages and biostratigraphic Last Appearance Datum (LAD). The core-bottom age was estimated to be about 700 ka. Although the $CaCO_3$ content is very low less than 1.0% throughout the core, the opal and TOC contents show clear glacial-interglacial cyclic variation such that they are high during the interglacial periods (7.2-50.3% and 0.05-1.00%, respectively) and low during the glacial periods (5.2-25.2% and 0.01-0.68%, respectively). According to the spectral analysis, the variation of opal content is controlled mainly by eccentricity forcing and subsequently by obliquity forcing during the last 700 kyrs. The opal contents of Core LHB-3PC also represent the apparent Mid-Pleistocene Transition (MPT)-related climatic variation in the glacial-interglacial cycles. In particular, the orbital variation of the opal contents shows increasing amplitudes since marine isotope stage (MIS) 11, which defines one of the important paleoclimatic events during the late Quaternary, called the "Mid-Brunhes Event". Based on the variation of the opal contents in Core LHB-3PC, we suggest that the surface-water paleoproductivity in the Indian Sector of the Southern Ocean followed the orbital (glacial-interglacial) cycles, and was controlled mainly by the extent of sea ice distribution during the last 700 kyrs.

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References

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