Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments

doi:10.1016/j.pocean.2010.12.016

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	Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments
	Lim, Dhongil 1; Xu, Zhaokai 2,3; Choi, Jinyong 2; Kim, Soyoung 1; Kim, Eunhee 1; Kang, Sora 1; Jung, Hoisoo 1; Lim, D (reprint author), Korea Ocean Res & Dev Inst, S Sea Inst, 391 Jangmok Ri, Jangmok Myun 656830, Geoje, South Korea
刊名	PROGRESS IN OCEANOGRAPHY
	2011
卷号	88 期号:1-4 页码:101-115
ISSN号	0079-6611
DOI	10.1016/j.pocean.2010.12.016
文献子类	Review
英文摘要	A millennial-scale paleoceanographic record of the Ulleung Basin in the southern part of the East (Japan) Sea (ES) for the last 20,000 years was reconstructed based on variations in the element compositions of core sediment. Most of the elements showed relatively wide content ranges throughout the core, largely because of different sediment types, their grain size spectra, biological components, and geochemical conditions (i.e., redox conditions). In particular, biogenic components (Ca, Sr, Ba, and CaCO(3)) and some minor elements (Cu, Mn, Mo, U, Cd, Zn, and V) revealed three distinct intervals of major paleoceanographic changes. Interval 1 (similar to 18-9.3 kyr BP) is characterized by a rhythmic alternation of dark- and light-colored sediment bands. Distinctive differences in the abundance of organic carbon, carbonate, and redox-elements between the dark- and light-colored-sediment layers are probably attributable to especially those associated with bottom-water redox variations combined with the enhanced primary productivity and water stratification in the Ulleung Basin.; A millennial-scale paleoceanographic record of the Ulleung Basin in the southern part of the East (Japan) Sea (ES) for the last 20,000 years was reconstructed based on variations in the element compositions of core sediment. Most of the elements showed relatively wide content ranges throughout the core, largely because of different sediment types, their grain size spectra, biological components, and geochemical conditions (i.e., redox conditions). In particular, biogenic components (Ca, Sr, Ba, and CaCO(3)) and some minor elements (Cu, Mn, Mo, U, Cd, Zn, and V) revealed three distinct intervals of major paleoceanographic changes. Interval 1 (similar to 18-9.3 kyr BP) is characterized by a rhythmic alternation of dark- and light-colored sediment bands. Distinctive differences in the abundance of organic carbon, carbonate, and redox-elements between the dark- and light-colored-sediment layers are probably attributable to especially those associated with bottom-water redox variations combined with the enhanced primary productivity and water stratification in the Ulleung Basin. These alternations perhaps reflect fluctuations in paleo-discharge from Chinese and/or Korean rivers during the last deglaciation. From a global perspective, the repetition of dark sapropelic sediment layers suggests a possible teleconnection between oceanographic change and development of the East Asian summer monsoon and consequent fluctuations in fluvial discharge from Korean and Chinese rivers to the East Sea basin. In Interval 2 (9.3-6.5 kyr BP), a remarkable increase in the concentrations of organic carbon and redox elements is probably linked to the intrusion of the warm/saline Tsushima Current to the basin, which would have enhanced ventilation and upwelling of nutrient-rich sub-surface waters. In parallel, a pronounced decrease in carbonate content indicates extensive carbonate dissolution due to the consumption of large amounts of free pore-water oxygen in surface sediments that would have accompanied by the decomposition of organic matter. In Interval 3(6.5 kyr BP-Present), most geochemical parameters are relatively constant, suggesting little changes in paleoenvironments; these observations indicate that modern oceanographic conditions were established in the East Sea at about 6.5 kyr BP. In particular, a prominent decline in carbonate contents centered at around 3-4 kyr BP appears to have been caused by a decrease in primary productivity in association with a suppression of the warm Kuroshio Current, rather than by geochemical processes. (C) 2010 Elsevier Ltd. All rights reserved.
学科主题	Oceanography
URL标识	查看原文
语种	英语
WOS记录号	WOS:000287830400006
公开日期	2012-07-03
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/11512]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Lim, D (reprint author), Korea Ocean Res & Dev Inst, S Sea Inst, 391 Jangmok Ri, Jangmok Myun 656830, Geoje, South Korea
作者单位	1.Korea Ocean Res & Dev Inst, S Sea Inst, Jangmok Myun 656830, Geoje, South Korea 2.Kunsan Natl Univ, Dept Oceanog, Kunsan 573701, South Korea 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Lim, Dhongil,Xu, Zhaokai,Choi, Jinyong,et al. Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments[J]. PROGRESS IN OCEANOGRAPHY,2011,88(1-4):101-115.
APA	Lim, Dhongil.,Xu, Zhaokai.,Choi, Jinyong.,Kim, Soyoung.,Kim, Eunhee.,...&Lim, D .(2011).Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments.PROGRESS IN OCEANOGRAPHY,88(1-4),101-115.
MLA	Lim, Dhongil,et al."Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments".PROGRESS IN OCEANOGRAPHY 88.1-4(2011):101-115.