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Reconstructing hydrological variability in Lake Baikal during MIS 11: an application of oxygen isotope analysis of diatom silica

Mackay, AW; Karabanov, E; Leng, MJ; Sloane, HJ; Morley, DW; Panizzo, VN; Khursevich, G; (2008) Reconstructing hydrological variability in Lake Baikal during MIS 11: an application of oxygen isotope analysis of diatom silica. Journal of Quaternary Science , 23 (4) 365 - 374. 10.1002/jqs.1174. Green open access

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Abstract

In this paper we reconstruct hydrological variability in Lake Baikal during Marine Isotope Stage 11 (MIS 11) (427-362 ka BP) from oxygen isotope analysis of diatom silica. Highest delta O-18(diatom) values are found during MIS 11.3, highlighting the dominance of hydrological input from rivers flowing into the south and central basins of Lake Baikal, especially the Selenga River. Hydrological input from south basin rivers dominated for over 30 ka. However, there is evidence from both biogenic silica and delta O-18(diatom) records for an abrupt cooling event at ca. 390 ka BP. Stadial conditions at this time are coincident with an iceberg discharge event into the North Atlantic. The decline in delta O-18(diatom) values suggests increasing proportion of hydrological input from rivers to the north of Lake Baikal, due to greater influence of winter precipitation and snow-melt. After a period of interstadial conditions during the early stages of MIS 11.1, biogenic silica and delta O-18(diatom) values decline, mirroring the slow growth in Northern Hemisphere ice sheets. Despite rigorous cleaning procedures, palaeoclimatic inferences need to be treated with caution due to contamination of the delta O-18(diatom) record; during stadial and glacial periods, contamination of the delta O-18(diatom) record is even more significant. (c) Natural Environment Research Council (NERC) copyright 2008. Reproduced with the permission of NERC. Published by John Wiley & Sons, Ltd.

Type: Article
Title: Reconstructing hydrological variability in Lake Baikal during MIS 11: an application of oxygen isotope analysis of diatom silica
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/jqs.1174
Publisher version: http://dx.doi.org/10.1002/jqs.1174
Language: English
Additional information: This is the pre-peer reviewed version of the following article: Mackay, AW and Karabanov, E and Leng, MJ and Sloane, HJ and Morley, DW and Panizzo, VN and Khursevich, G and Williams, D (2008) Reconstructing hydrological variability in Lake Baikal during MIS 11: an application of oxygen isotope analysis of diatom silica. Journal of Quaternary Science , 23 (4) 365 - 374., which has been published in final form at http://dx.doi.org/10.1002/jqs.1174
Keywords: MIS 11, palaeoclimate, Lake Baikal, delta O-18(diatom), biogenic silica, BIOGENIC SILICA, CLIMATE VARIABILITY, LATE PLEISTOCENE, WARM FUTURE, STAGE 11, SEDIMENTS, SIBERIA, RECORD, ATLANTIC, PALEOCLIMATOLOGY
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/46356
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