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Wetting and drying of Australia over the past 300 ka

Journal Article


Abstract


  • Alternately dry and wet climatic episodes across central and eastern Australia during the past 300 ka have greatly affected Australia's rivers, lakes, and dune fields. Evidence of widespread climate and flow-regime changes has been provided by 75 thermoluminescence (TL) dates and 18 U/Th dates from alluvial and eolian sediments. Fluvial conditions dominated part of the last two interglacials (stage 5 and 7), resulting in large sand loads in rivers in the present Simpson Desert and southeastern Australia. During the last interglacial, fluvial activity in central Australia peaked at ~110 ka (stage 5 pluvial), probably ~5-10 ka behind world temperature and sea-level maxima. Following the last late interglacial wet phase, aridity associated with dune building spread from central Australia toward its margins, achieving greatest intensity during the last glacial maximum. A less widespread wet phase, identified at about 55-35 ka (stage 3 subpluvial), is associated with high lake levels and paleochannel activity in southeastern Australia. -from Authors

Publication Date


  • 1992

Scopus Eid


  • 2-s2.0-84879883821

Web Of Science Accession Number


Start Page


  • 791

End Page


  • 794

Volume


  • 20

Issue


  • 9

Place Of Publication


Abstract


  • Alternately dry and wet climatic episodes across central and eastern Australia during the past 300 ka have greatly affected Australia's rivers, lakes, and dune fields. Evidence of widespread climate and flow-regime changes has been provided by 75 thermoluminescence (TL) dates and 18 U/Th dates from alluvial and eolian sediments. Fluvial conditions dominated part of the last two interglacials (stage 5 and 7), resulting in large sand loads in rivers in the present Simpson Desert and southeastern Australia. During the last interglacial, fluvial activity in central Australia peaked at ~110 ka (stage 5 pluvial), probably ~5-10 ka behind world temperature and sea-level maxima. Following the last late interglacial wet phase, aridity associated with dune building spread from central Australia toward its margins, achieving greatest intensity during the last glacial maximum. A less widespread wet phase, identified at about 55-35 ka (stage 3 subpluvial), is associated with high lake levels and paleochannel activity in southeastern Australia. -from Authors

Publication Date


  • 1992

Scopus Eid


  • 2-s2.0-84879883821

Web Of Science Accession Number


Start Page


  • 791

End Page


  • 794

Volume


  • 20

Issue


  • 9

Place Of Publication