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

Mackay, Anson W.; Karabanov, Eugene; Leng, Melanie J.; Sloane, Hilary J.; Morley, David W.; Panizzo, Virginia N.; Khursevich, Galina; Williams, Douglas

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 δ18Odiatom 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 δ18Odiatom 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 δ18Odiatom 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 δ18Odiatom 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 δ18Odiatom record; during stadial and glacial periods, contamination of the δ18Odiatom record is even more significant. © Natural Environment Research Council (NERC) copyright 2008. Reproduced with the permission of NERC. Published by John Wiley & Sons, Ltd.

Citation

Mackay, A. W., Karabanov, E., Leng, M. J., Sloane, H. J., Morley, D. W., Panizzo, V. N., Khursevich, G., & Williams, D. (2007, April). Reconstructing hydrological variability in Lake Baikal during MIS 11: An application of oxygen isotope analysis of diatom silica. Presented at Isotopes in Biogenic Silica (IBiS), Nottingham, UK

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Isotopes in Biogenic Silica (IBiS)
• Start Date: Apr 18, 2007
• End Date: Apr 18, 2007
• Acceptance Date: Jan 22, 2008
• Online Publication Date: Apr 28, 2008
• Publication Date: May 1, 2008
• Deposit Date: Sep 8, 2020
• Journal: Journal of Quaternary Science
• Print ISSN: 0267-8179
• Electronic ISSN: 1099-1417
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 23
• Issue: 4
• Pages: 365-374
• DOI: https://doi.org/10.1002/jqs.1174
• Public URL: https://nottingham-repository.worktribe.com/output/3179497
• Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.1174