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The Holocene
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Early-Holocene aridity in tropical northern Australia

Jonathan Nott

School of Tropical Environment Studies and Geography, James Cook University of North Queensland, PO Box 6811, Cairns, Queensland 4870, Australia

Edward Bryant

David Price

School of Geosciences, University of Wollongong, Northfields Avenue, Wollongong, New South Wales 2522, Australia

Thermoluminescence ages from a longitudinal dunefield in tropical northern Australia suggest that complete dune activation occurred here either continuously or sporadically between approximately 8.2 ka and 5.9 ka. This period, in Australia, is normally ascribed to one of increasingly warm and wet conditions towards the Holocene Climatic Optimum. However, elsewhere, this time (~8 ka) coincides with a brief period of global climate change recognized in 18O records from Antarctica, methane records of the Greenland Summit ice cores, changes to deep-sea benthic foraminferal composition and atmospheric 14C variations. In tropical Africa two distinct phases of aridity have been dated at approximately 8 ka and 6 ka. The coincidence of aeolian reactivation episodes in this north Australian dunefield with brief phases of early-Holocene climate change elsewhere suggests possible global climatic teleconnections at this time.

Key Words: Longitudinal dunes • aridity • thermoluminescence • Gulf of Carpentaria • Climatic Optimum • tropical Australia • early Holocene

The Holocene, Vol. 9, No. 2, 231-236 (1999)
DOI: 10.1191/095968399673789264
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