globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.09.025
Scopus记录号: 2-s2.0-84881371477
论文题名:
Hydrological instability during the Last Interglacial in central Asia: A new diatom oxygen isotope record from Lake Baikal
作者: Mackay A.W.; Swann G.E.A.; Fagel N.; Fietz S.; Leng M.J.; Morley D.; Rioual P.; Tarasov P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 66
起始页码: 45
结束页码: 54
语种: 英语
英文关键词: δ18Odiatom ; Amoc ; Bond events ; Lake Baikal ; Last Interglacial
Scopus关键词: Amoc ; Atlantic meridional overturning circulations ; Freshwater discharge ; Global-mean temperature ; Isotopic composition ; Lake Baikal ; Last interglacial ; Oxygen isotope records ; Catchments ; Isotopes ; Productivity ; Lakes ; biological production ; diatom ; discharge ; Heinrich event ; hydrological change ; ice-rafted debris ; insolation ; isotopic composition ; Last Interglacial ; overturn ; oxygen isotope ; paleohydrology ; teleconnection ; westerly ; Atlantic Ocean ; Atlantic Ocean (North) ; Central Asia ; Lake Baikal ; Russian Federation ; Bacillariophyta
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 (δ18Odiatom) 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 δ18Odiatom values, with a pacing of approximately 1.26 ± 0.3 ka, similar to fluctuations of within lake productivity. Fluctuations in δ18Odiatom values show good agreement with patterns in Atlantic meridional overturning circulation (AMOC), supporting hypothesis of strong teleconnections via theWesterlies between the North Atlantic and central Asia. Two periods of low δ18Odiatom 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 Lake Baikal provides evidence for strong penetration of Westerlies into central Asia during the latter stages of the Last Interglacial. Variability in δ18Odiatom 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. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60747
Appears in Collections:过去全球变化的重建

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作者单位: Environmental Change Research Centre, Department of Geography, UCL, Gower Street, London WC1E 6BT, United Kingdom; School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom; Clays and Paleoclimate (URAP), Department of Geology, University of Liège, Allée du 6 Août, B-4000 Liège, Belgium; Institut de Ciència i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona (UAB), Campus UAB, 08193 Bellaterra, Spain; NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom; Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom; Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Freie Universität Berlin, Institute of Geological Sciences, Palaeontology, Malteserstrasse 74-100, Building D, 12249 Berlin, Germany

Recommended Citation:
Mackay A.W.,Swann G.E.A.,Fagel N.,et al. Hydrological instability during the Last Interglacial in central Asia: A new diatom oxygen isotope record from Lake Baikal[J]. Quaternary Science Reviews,2013-01-01,66
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