Reconstruction of environmental changes using a multi-proxy approach in the Ulleung Basin (Sea of Japan) over the last 48 ka
Version of Record online: 11 DEC 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Special Issue: WESTERN PACIFIC PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY: LAND-SEA LINKAGE AND VARIABILITY OF CENTENNIAL TO ORBITAL SCALES
Volume 27, Issue 9, pages 891–900, December 2012
How to Cite
Zou, J., Shi, X., Liu, Y., Liu, J., Selvaraj, K. and Kao, S.-J. (2012), Reconstruction of environmental changes using a multi-proxy approach in the Ulleung Basin (Sea of Japan) over the last 48 ka. J. Quaternary Sci., 27: 891–900. doi: 10.1002/jqs.2578
- Issue online: 11 DEC 2012
- Version of Record online: 11 DEC 2012
- Manuscript Accepted: 26 JUL 2012
- Manuscript Revised: 6 MAY 2012
- Manuscript Received: 30 SEP 2011
- sediment geochemistry;
- Ulleung Basin
Based on elemental geochemical data, we reconstructed the sediment provenance, surface productivity and bottom water redox conditions for the last 48 ka in the Ulleung Basin (Sea of Japan) and inferred the factors controlling them. Al2O3/TiO2 ratio and chemical index of alteration (CIA) suggest that sediment provenance changed during the glacial period (48–18 ka) compared to the deglacial (ca. 18–11 ka) and Holocene. Mass accumulation rates of total organic carbon (TOC), CaCO3, phosphorus, cadmium and excess barium reveal low paleoproductivity during low sea stand. During 18–11 ka, productivity increased due to increasing inflow of nutrient-rich water masses – the Oyashio and the East China Sea coastal water – in tandem with the rising sea level. Maximum productivity occurred during Younger Dryas and Pre-boreal periods when sea level was at ∼ −60 m and then gradually decreased as the Tsushima Warm Current inflow kicked off at ca. 9.3 ka, consistent with other paleoredox proxies, which reveal the presence of anoxic bottom water during ca. 12–9 ka. With the changes in paleoredox proxies and their ratios (TOC, Mo, U, Mn, C/S ratio and Uauthigenic and Mo contents), we hypothesized that the redox changes were mainly ventilation driven and were superimposed on the influence of circulation-induced productivity changes. The global climate and sea-level changes on a millennial timescale play a major role in enhancing paleoproductivity and restrict bottom water advection, subsequently driving the oxygenation of bottom water in the Ulleung Basin. Copyright © 2012 John Wiley & Sons, Ltd.