Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal

doi:10.1016/j.quascirev.2012.09.025

	Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal
	Mackay, Anson W.1; Swann, George E. A.2; Fagel, Nathalie 3; Fietz, Susanne 4; Leng, Melanie J.5,6; Morley, David 1; Rioual, Patrick 7; Tarasov, Pavel 8
刊名	QUATERNARY SCIENCE REVIEWS
	2013-04-15
卷号	66 页码:45-54
关键词	Last Interglacial delta O-18(diatom) Lake Baikal AMOC Bond events
ISSN号	0277-3791
DOI	10.1016/j.quascirev.2012.09.025
文献子类	Article
英文摘要	Last Interglacial variability is commonly used as an analogue for variability in a future, warmer world. Pervasive cycles are increasingly apparent in Last Interglacial archives, although studies in continental regions are under-represented. Here we provide a new isotopic record of diatom silica (delta O-18(diatom)) spanning c. 127.5-115 ka BP from Lake Baikal in central Asia. Peak rain-fed discharge occurred c. 125.4 ka BP, shortly after July insolation maximum and initiation of Siberian soil development. Between 127 and 119.7 ka BP there are six marked fluctuations in delta O-18(diatom) values, with a pacing of approximately 1.26 +/- 0.3 ka, similar to fluctuations of within lake productivity. Fluctuations in delta O-18(diatom) values show good agreement with patterns in Atlantic meridional overturning circulation (AMOC), supporting hypothesis of strong teleconnections via the Westerlies between the North Atlantic and central Asia. Two periods of low delta O-18(diatom) values are especially notable. The earliest between c. 126.5 and 126 ka BP is concurrent with the final stages of the Heinrich 11. The second between 120.5 and 119.7 ka BP is also concurrent with an increase in ice-rafted debris in the North Atlantic. Aquatic productivity in Lake Baikal increased between 119.7 and 117.4 ka BP before declining to the top of the record (115 ka BP) concomitant with a shift to predominately cool steppe catchment vegetation. However, isotopic composition of discharge into Like Baikal provides evidence for strong penetration of Westerlies into central Asia during the latter stages of the Last Interglacial. Variability in delta O-18(diatom) values was compared between the Last Interglacial and the Holocene. Millennial-scale variability was significantly more stable during the Last Interglacial, possibly linked to diminished influence of freshwater discharge on AMOC during periods of higher, global mean temperatures. (C) 2012 Elsevier Ltd. All rights reserved.
WOS关键词	BIOGENIC-SILICA ; NORTH-ATLANTIC ; CLIMATIC-CHANGE ; POLLEN RECORD ; LATE PLEISTOCENE ; HEINRICH EVENTS ; EEMIAN CLIMATE ; CENTRAL-EUROPE ; ICE CORES ; SEA-LEVEL
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000317448500005
资助机构	EU Framework V(EVK2-CT-2000-0057) ; EU Framework V(EVK2-CT-2000-0057) ; UK NERC(IP/740/0302) ; UK NERC(IP/740/0302) ; UK Quaternary Research Association ; UK Quaternary Research Association ; EU Framework V(EVK2-CT-2000-0057) ; EU Framework V(EVK2-CT-2000-0057) ; UK NERC(IP/740/0302) ; UK NERC(IP/740/0302) ; UK Quaternary Research Association ; UK Quaternary Research Association ; EU Framework V(EVK2-CT-2000-0057) ; EU Framework V(EVK2-CT-2000-0057) ; UK NERC(IP/740/0302) ; UK NERC(IP/740/0302) ; UK Quaternary Research Association ; UK Quaternary Research Association ; EU Framework V(EVK2-CT-2000-0057) ; EU Framework V(EVK2-CT-2000-0057) ; UK NERC(IP/740/0302) ; UK NERC(IP/740/0302) ; UK Quaternary Research Association ; UK Quaternary Research Association
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87450]
专题	中国科学院地质与地球物理研究所
通讯作者	Mackay, Anson W.
作者单位	1.UCL, Environm Change Res Ctr, Dept Geog, London WC1E 6BT, England 2.Univ Nottingham, Sch Geog, Nottingham NG7 2RD, England 3.Univ Liege, Clays & Paleoclimate URAP, Dept Geol, B-4000 Liege, Belgium 4.Univ Autonoma Barcelona, ICTA, Bellaterra 08193, Spain 5.British Geol Survey, NERC Isotope Geosci Lab, Nottingham NG12 5GG, England 6.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England 7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China 8.Free Univ Berlin, Inst Geol Sci, D-12249 Berlin, Germany
推荐引用方式 GB/T 7714	Mackay, Anson W.,Swann, George E. A.,Fagel, Nathalie,et al. Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal[J]. QUATERNARY SCIENCE REVIEWS,2013,66:45-54.
APA	Mackay, Anson W..,Swann, George E. A..,Fagel, Nathalie.,Fietz, Susanne.,Leng, Melanie J..,...&Tarasov, Pavel.(2013).Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal.QUATERNARY SCIENCE REVIEWS,66,45-54.
MLA	Mackay, Anson W.,et al."Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal".QUATERNARY SCIENCE REVIEWS 66(2013):45-54.