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

Cited 21 time in WEB OF SCIENCE Cited 22 time in Scopus
Title
Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000 years: Evidence from variations in element composition of core sediments
Author(s)
Lim, Dhongil; Xu, Zhaokai; Choi, Jinyong; Kim, Soyoung; Kim, Eunhee; Kang, Sora; Jung, Hoisoo
KIOST Author(s)
Lim, Dhongil(임동일)Jung, Hoi Soo(정회수)
Publication Year
2011-01
Abstract
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 CaCO3) 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.
ISSN
0079-6611
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3922
DOI
10.1016/j.pocean.2010.12.016
Bibliographic Citation
PROGRESS IN OCEANOGRAPHY, v.88, no.1-4, pp.101 - 115, 2011
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
LATE QUATERNARY SEDIMENTS; MARINE-SEDIMENTS; PALEOENVIRONMENTAL CHANGES; LATE PLEISTOCENE; OKINAWA TROUGH; SURFACE SEDIMENTS; ORGANIC-MATTER; CHINA SEA; NORTHWESTERN PACIFIC; CONTINENTAL-MARGIN
Type
Article
Language
English
Document Type
Review
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse