High resolution record of the Last Glacial Maximum in eastern Australia

Petherick, Lynda, Moss, Patrick and McGowan, Hamish (2010). High resolution record of the Last Glacial Maximum in eastern Australia. In: Proceedings of the European Geosciences Union General Assembly 2010. European Geosciences Union General Assembly 2010, Vienna, Austria, (1-2). 2-7 May 2010.

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UQ230593.pdf Published abstract application/pdf 31.09KB 62
Author Petherick, Lynda
Moss, Patrick
McGowan, Hamish
Title of paper High resolution record of the Last Glacial Maximum in eastern Australia
Conference name European Geosciences Union General Assembly 2010
Conference location Vienna, Austria
Conference dates 2-7 May 2010
Convener Denis-Didier Rousseau
Proceedings title Proceedings of the European Geosciences Union General Assembly 2010
Journal name Geophysical Research Abstracts
Place of Publication Goettingen, Germany
Publisher Copernicus
Publication Year 2010
Sub-type Published abstract
Open Access Status File (Author Post-print)
ISSN 1607-7962
Volume 12
Start page 1
End page 2
Total pages 2
Language eng
Abstract/Summary A continuous, high resolution (average ca. 22 year) record encompassing the Last Glacial Maximum (LGM) has been developed using multiple proxies (aeolian sediment flux, grain size, pollen and charcoal) in lake sediment from Tortoise Lagoon (TOR), North Stradbroke Island, Queensland, Australia. The presence of Asteraceae tubilifloreae and spineless Asteraceae (common indicators of glacial conditions in Australia) at TOR indicates significantly cooler temperatures (mean annual temperature up to 6oC lower than today). In addition to the palaeoclimatic reconstruction, a record of palaeodust transport pathways for eastern Australia was developed using ICP-MS trace element analysis and geochemical “fingerprinting” of TOR aeolian sediment to continental dust source areas. Vectors between dominant dust source areas and North Stradbroke Island allowed the reconstruction of the position and intensity of LGM dust transport pathways. Furthermore, changes in likely synpotic scale conditions can be postulated based on the position of the dust transport corridors. Similarities between the vegetation at TOR during the LGM and that at temperate sites e.g. Caledonia Fen, Victoria (Kershaw et al. 2007), Redhead Lagoon, New South Wales (Williams et al. 2006) and Barrington Tops, New South Wales (Sweller and Martin 2001) suggests that this record reflects regional conditions across southeastern Australia. The TOR record also correlates well with that from nearby Native Companion Lagoon which suggests that the LGM was actually an extended period of ca. 8 – 10 kyr, characterised by 2 periods of increased aridity (ca. 30 – 26.5 kyr and 21 – 19.5 kyr) (Petherick et al. 2008). A growing number of records from across the Southern Hemisphere e.g. New Zealand (Suggate and Almond 2003; Alloway et al. 2007; Newnham et al. 2007), Chile (Denton et al. 1999), Antarctica (Röthlisberger et al. 2002; EPICA 2006) and Australia (Smith 2009) also show evidence that the LGM encompassed a longer period of time than traditionally accepted, and was not uniformly cool and dry.
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Open session on climate: Past, present and future (including Hans Oeschger Medal Lecture)

 
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Created: Mon, 28 Feb 2011, 15:14:27 EST by Associate Professor Hamish Mcgowan on behalf of School of Geography, Planning & Env Management