Article (Scientific journals)
Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal
Mackay, Anson; Swann, Georges; Fagel, Nathalie et al.
2013In Quaternary Science Reviews, 66, p. 45-54
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Keywords :
lake; baikal; climate; interglacial; diatom
Abstract :
[en] 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 (d18Odiatom) spanning c. 127.5e115 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 d18Odiatom values, with a pacing of approximately 1.26 0.3 ka, similar to fluctuations of within lake productivity. Fluctuations in d18Odiatom 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 d18Odiatom 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 d18Odiatom 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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mackay, Anson
Swann, Georges
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Fietz, Suzanne
Leng, Melanie
Morley, David
Language :
French
Title :
Hydrological instability during the Last Interglacial in central Asia: a new diatom oxygen isotope record from Lake Baikal
Publication date :
2013
Journal title :
Quaternary Science Reviews
ISSN :
0277-3791
eISSN :
1873-457X
Publisher :
Elsevier, Oxford, United Kingdom
Volume :
66
Pages :
45-54
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Continent
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation [BE]
Available on ORBi :
since 08 February 2013

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