DOI: 10.1038/ngeo2053
论文题名: Delayed hydrological response to Greenland cooling at the onset of the Younger Dryas in western Europe
作者: Rach O. ; Brauer A. ; Wilkes H. ; Sachse D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 2 起始页码: 109
结束页码: 112
语种: 英语
Scopus关键词: aridification
; biomarker
; climate effect
; cooling
; environmental change
; hydrogen isotope
; hydrological response
; ice core
; isotopic composition
; lacustrine deposit
; last deglaciation
; paleohydrology
; vegetation dynamics
; westerly
; Younger Dryas
; Western Europe
英文摘要: The general warming trend of the last deglaciation was interrupted by the Younger Dryas, a period of abrupt cooling and widespread environmental change. Ice core records suggest the abrupt cooling began 12,846 years ago in Greenland, about 170 years before the significant environmental and vegetation change in western Europe classically defined as the Younger Dryas. However, this difference in timing falls within age model uncertainties. Here we use the hydrogen isotope composition of lipid biomarkers from precisely dated varved sediments from Lake Meerfelder Maar to reconstruct hydroclimate over western Europe. We observe a decrease in the hydrogen isotope values of both aquatic and terrestrial lipids 12,850 years ago, indicating cooling climate in this region synchronous with the abrupt cooling in Greenland. A second drop occurs 170 years later, mainly in the hydrogen isotope record of aquatic lipids but to a lesser extent in the terrestrial lipids, which we attribute to aridification, as well as a change in moisture source and pathway. We thus confirm that there was indeed a lag between cooling and substantial hydrologic and environmental change in western Europe. We suggest the delay is related to the expansion of sea ice in the North Atlantic Ocean and the subsequent southward migration of the westerly wind system. We further suggest that these hydrological changes amplified environmental change in western Europe at the onset of the Younger Dryas. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106456
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Institute for Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Straße 24-25, Potsdam 14476, Germany; GFZ-German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Evolution, Telegrafenberg, Potsdam 14473, Germany; GFZ-German Research Centre for Geosciences, Section 4.3 Organic Geochemistry, Telegrafenberg, Potsdam 14473, Germany
Recommended Citation:
Rach O.,Brauer A.,Wilkes H.,et al. Delayed hydrological response to Greenland cooling at the onset of the Younger Dryas in western Europe[J]. Nature Geoscience,2014-01-01,7(2)