Ocean and Polar Research

  • 제28권1호
  • /
  • Pages.1-12
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  • 2006
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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북극해 스발바드 군도 피오르드에서 일어난 홀로세의 빙해양 퇴적작용과 고기후적 의미

Holocene Glaciomarine Sedimentation and Its Paleoclimatic Implication on the Svalbard Fjord in the Arctic Sea

  • 윤호일 (한국해양연구원 부설 극지연구소) ;
  • 김예동 (한국해양연구원 부설 극지연구소) ;
  • 유규철 (한국해양연구원 부설 극지연구소) ;
  • 이재일 (한국해양연구원 부설 극지연구소) ;
  • 남승일 (한국지질자원연구원)
  • 발행 : 2006.03.31
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초록

Analyses of sedimentological and geochemical parameters from two radiocarbon-dated sediment cores (JM98-845-PC and JM98-818-PC) retrieved from the central part of Isfjorden, Svalbard, in the Arctic Sea, reveal detailed paleoclimatic and paleoceanographic histories over the last 15,000 radiocarbon years. The overconsolidated diamicton at the base of core JM98-845-PC is supposed to be a basal till deposited beneath pounding glacier that had advanced during the LGM (Last Glacial Maximum). Deglaciation of the fjord commenced after the glacial maximum, marked by the deposition of interlaminated sand and mud in the ice-proximal zone by subglacial meltwater discharge, and prevailed between 13,700 and 10,800 yr B.P. with enriched-terrigenous organic materials. A return to colder conditions occurred at around 10,800 yr B.P. with a drop in TOC content, which is probably coincident with the Younger Dryas event in the North Atlantic region. At this time, an abrupt decrease of TOC content as well as an increase in C/N ratio suggests enhanced terrigenous input due to the glacial readvance. A climatic optimum is recognized between 8,395 and 2,442 yr B.P., coinciding with 'a mid-Holocene climatic optimum' in Northern Hemisphere sites (e.g., the Laurentide Ice sheet). During this time, as the sea ice receded from the fjord, enhanced primary productivity occurred in open marine conditions, resulting in the deposition of organic-enriched pebbly mud with evidence of TOC maxima and C/N ratio minima in sediments. Fast ice also disappeared from the coast, providing the maximum of IRD (ice-rafted debris) input. Around 2,442 yr B.p. (the onset of Neoglacial), pebbly mud, characterized by a decrease in TOC content, reflects the formation of more extensive sea ice and fast ice, which might cause decreased primary productivity in the surface water, as evidenced by a decrease in TOC content. Our results provide evidence of climatic change on the Svalbard fjords that helps to refine the existence and timing of late Pleistocene and Holocene millennial-scale climatic events in the Northern Hemisphere.

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참고문헌

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피인용 문헌

  1. List of Korean Names for the Vascular Plants in Spitsbergen Island, in the Arctic Region vol.34, pp.1, 2012, https://doi.org/10.4217/OPR.2012.34.1.101