동위원소 단계 6, 2에서의 알케논 온도: 온도변화에 대한 서로 다른 기작

Title
동위원소 단계 6, 2에서의 알케논 온도: 온도변화에 대한 서로 다른 기작
Alternative Title
An alkenone sea surface temperature during the MIS 6 and 2 in East Sea (Japan Sea): Different mechanism for SST changes
Author(s)
우경식; 현상민; 김정무; 임운혁; 심원준; 윤석훈; 석봉출; 김진경
KIOST Author(s)
Hyun, Sangmin(현상민)Yim, Un Hyuk(임운혁)Shim, Won Joon(심원준)
Publication Year
2007-09-01
Abstract
Stratigraphy and paleoenvironmental changes since the last Marine Isotope Stage (MIS) 9 were reconstructed based on the oxygen isotope compositions of forminifera and alkenons data from the deep-sea sediments piston core (M04-PC1A) taken from the Korea Plateau in the East Sea. Oxygen isotopic records of the planktonic foraminifera, that were estimated to be ca. 320 ka in age, show the MIS from 1 to 9. Comparing this result with previously reported stable isotope data in the East Sea as well as the global 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 MIS 2.1 and 6.2, respectively. Especially, paleotemperature variations of the surface water in the East Sea were reconstructed using unsaturated longchain alkenones (ULA) along with oxygen isotope data. The result shows that paleotemperature was about 10oC 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 oC. Both oxygen isotope and ULA data show the systematic coeval trend throughout the late Quaternary. The relatively big SST differences between MIS 6 and MIS 2 may closely relate with paleoceanographic environments such as deep water circulation, local river runoff during each glacial periods. Physiographic situation due to the lowered sea-level is a plausible explanation of the big SST differences. These data suggesting local oceanographic conditions were more distinctive feature and have prevailed since the MIS 6 in the East Sea.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30383
Bibliographic Citation
Proc. of 9th ICP, pp.104, 2007
Publisher
Proc. of 9th ICP
Type
Conference
Language
English
Publisher
Proc. of 9th ICP
Related Researcher
Research Interests

Microplastic pollution,Persistent Organic Pollutants,Oil Pollution,미세플라스틱 오염,잔류성 유기오염물질,유류오염

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