Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?

Lynda Petherick, McGowan, Hamish A. and Moss, Patrick (2008) Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?. Journal of Quaternary Science, 23 8: 787-802. doi:10.1002/jqs.1186


Author Lynda Petherick
McGowan, Hamish A.
Moss, Patrick
Title Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?
Journal name Journal of Quaternary Science   Check publisher's open access policy
ISSN 0267-8179
Publication date 2008-01-01
Sub-type Article (original research)
DOI 10.1002/jqs.1186
Open Access Status Not yet assessed
Volume 23
Issue 8
Start page 787
End page 802
Total pages 16
Editor C J Caseldine
Place of publication United Kingdom
Publisher John Wiley & Sons Ltd.
Language eng
Subject C1
040606 Quaternary Environments
970104 Expanding Knowledge in the Earth Sciences
04 Earth Sciences
0406 Physical Geography and Environmental Geoscience
040605 Palaeoclimatology
Abstract A high-resolution, multiproxy record encompassing the last glacial-interglacial transition is presented for Native Companion Lagoon, a coastal site in subtropical eastern Australia. Rates of aeolian sedimentation in the lake were established by trace element analyses of lacustrine sediments and used as a proxy for aridity. In conjunction with sediment moisture content, charcoal and pollen these provide a multi-decadal record of palaeoenvironmental variability for the period 33-18 k cal. yr BP. Results indicate that the Last Glacial Maximum in eastern Australia spanned almost 10 k cal. yr, and was characterised by two distinct cold dry events at approximately 30.8 k cal. yr BP and 21.7 k cal. yr BP. Provenance of selected sediment samples by trace element geochemical fingerprinting shows that continental sourced aeolian sediments originated primarily from South Australia during these cold events and from sites in central Australia during the intervening time. Used in combination with a pollen record, the provenance of long-travelled dust to mainland sites shows that the two cold events were characterised by frequent meridional dry southwesterly winds rather than zonal westerly airflow as previously believed. The intervening period was cool and humid, which we infer as being associated with more frequent southeasterly winds of maritime origin. These results lend support to previous research that indicates the Southern Hemisphere experienced a period of widespread climatic amelioration at the height of the last glacial known as the Antarctic Isotopic Maximum. Copyright © 2008 John Wiley & Sons, Ltd.
Keyword Antarctic Isotope Maximum
Eastern Australia
Dust
Last Glacial Maximum
Pollen
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Geography, Planning and Environmental Management Publications
 
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