Abrupt SST changes during the MIS 6 and 2 in East Sea (Japan Sea): paleoceanographic implication
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Title
- Abrupt SST changes during the MIS 6 and 2 in East Sea (Japan Sea): paleoceanographic implication
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Author(s)
- 현상민; J.M. Kim; 심원준; 임운혁; S.H. Yoon; K.S. Woo; 석봉출
- KIOST Author(s)
- Hyun, Sang Min(현상민); Shim, Won Joon(심원준); Yim, Un Hyuk(임운혁)
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Alternative Author(s)
- 현상민; 심원준; 임운혁; 석봉출
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Publication Year
- 2006-09-03
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Abstract
- Stable oxygen isotope compositions of foraminifera and alkenones variation of a piston core (M04-PC1A) were conducted to elucidate the evolution of paleoceanography of the East Sea (Japan Sea). Paleoenvironmental change since the late ~ 320 ka were reconstructed based on the oxygen isotope compositions of forminifera and alkenons data from the deep-sea sediments of the piston core taken from the Korea Plateau in the East Sea (Japan Sea). Oxygen isotopic records of the planktonic foraminifera, that were estimated to be ca. 320 ka in age, show the Marine Isotope Stage (MIS) from 1 to 8. Comparing this result with previously reported stable isotope data in the East Sea as well as the glacial oxygen isotope trend, it is suggested that paleoceanographic and paleoclimatic changes in the East Sea has been quite different from those of open oceans: it reserves freshwater input signals and steep drop of paleotemperature (about 2 per mil heavier) at the MSI 2.1 and ^.2, respectively. Paleotemperature variations of the sutface water in the East Sea were reconstructed using unsaturated longchain alkenones (ULA) along with oxygen isotope data. The result shows that paleotemperature was about 10℃ lower than today's surface temperature during the MIS 6.2. However, paleotemperature during the MIS 2.2 was characterized by relatively small temperature drop of about 3℃. Both oxygen isotope and ULA data show the systematic coeval trend throughout the late Quaternary. These data suggesting local oceanographic conditions were more distinctive feature and have prevailed since the MIS 6 in the East Sea
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/30910
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Bibliographic Citation
- International Symposium og IGCP-476, pp.25, 2006
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Publisher
- International Symposium og IGCP-476
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Type
- Conference
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Language
- English
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