Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity
Optically stimulated and thermoluminescence ages from relict shorelines, along with accelerator mass spectrometer 14C ages from freshwater molluscs reveal a record of variable moisture sources supplied by northern and southern river systems to Lake Mega-Frome in southern central Australia during the...
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ftunivwollongong:oai:ro.uow.edu.au:scipapers-7900 2023-05-15T18:25:39+02:00 Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity Cohen, T J Nanson, G C Jansen, John D. Jones, B G Jacobs, Z Larsen, J R May, J.-H Treble, P Price, D M Smith, A M 2012-01-01T08:00:00Z https://ro.uow.edu.au/scipapers/4557 unknown Research Online https://ro.uow.edu.au/scipapers/4557 Faculty of Science - Papers (Archive) late increased sources moisture varying australia central systems aridity river continental southern northern fed lakes mega quaternary GeoQUEST Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences article 2012 ftunivwollongong 2020-02-25T10:56:30Z Optically stimulated and thermoluminescence ages from relict shorelines, along with accelerator mass spectrometer 14C ages from freshwater molluscs reveal a record of variable moisture sources supplied by northern and southern river systems to Lake Mega-Frome in southern central Australia during the late Quaternary. Additional lacustrine, palynological and terrestrial proxies are used to reconstruct a record that extends back to 105 ka, confirming that Lakes Mega-Frome and Mega-Eyre were joined to create the largest system of palaeolakes on the Australian continent as recently as 50-47 ka. The palaeohydrological record indicates a progressive shift to more arid conditions, with marked drying after 45 ka. Subsequently, Lake Mega-Frome has filled independently at 33-31 ka and at the termination of the Last Glacial Maximum to volumes some 40 times those of today. Further sequentially declining filling episodes (to volumes 25-10 those of today) occurred immediately prior to the Younger Dryas stadial, in the mid Holocene and during the medieval climatic anomaly. Southern hemisphere summer insolation maxima are a poor predictor of palaeolake-filling episodes. An examination of multiple active moisture sources suggests that palaeolake phases were driven independently of insolation and at times by some combination of enhanced Southern Ocean circulation and strengthened tropical moisture sources. Article in Journal/Newspaper Southern Ocean University of Wollongong, Australia: Research Online Southern Ocean |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
late increased sources moisture varying australia central systems aridity river continental southern northern fed lakes mega quaternary GeoQUEST Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences |
spellingShingle |
late increased sources moisture varying australia central systems aridity river continental southern northern fed lakes mega quaternary GeoQUEST Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences Cohen, T J Nanson, G C Jansen, John D. Jones, B G Jacobs, Z Larsen, J R May, J.-H Treble, P Price, D M Smith, A M Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
topic_facet |
late increased sources moisture varying australia central systems aridity river continental southern northern fed lakes mega quaternary GeoQUEST Life Sciences Physical Sciences and Mathematics Social and Behavioral Sciences |
description |
Optically stimulated and thermoluminescence ages from relict shorelines, along with accelerator mass spectrometer 14C ages from freshwater molluscs reveal a record of variable moisture sources supplied by northern and southern river systems to Lake Mega-Frome in southern central Australia during the late Quaternary. Additional lacustrine, palynological and terrestrial proxies are used to reconstruct a record that extends back to 105 ka, confirming that Lakes Mega-Frome and Mega-Eyre were joined to create the largest system of palaeolakes on the Australian continent as recently as 50-47 ka. The palaeohydrological record indicates a progressive shift to more arid conditions, with marked drying after 45 ka. Subsequently, Lake Mega-Frome has filled independently at 33-31 ka and at the termination of the Last Glacial Maximum to volumes some 40 times those of today. Further sequentially declining filling episodes (to volumes 25-10 those of today) occurred immediately prior to the Younger Dryas stadial, in the mid Holocene and during the medieval climatic anomaly. Southern hemisphere summer insolation maxima are a poor predictor of palaeolake-filling episodes. An examination of multiple active moisture sources suggests that palaeolake phases were driven independently of insolation and at times by some combination of enhanced Southern Ocean circulation and strengthened tropical moisture sources. |
format |
Article in Journal/Newspaper |
author |
Cohen, T J Nanson, G C Jansen, John D. Jones, B G Jacobs, Z Larsen, J R May, J.-H Treble, P Price, D M Smith, A M |
author_facet |
Cohen, T J Nanson, G C Jansen, John D. Jones, B G Jacobs, Z Larsen, J R May, J.-H Treble, P Price, D M Smith, A M |
author_sort |
Cohen, T J |
title |
Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
title_short |
Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
title_full |
Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
title_fullStr |
Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
title_full_unstemmed |
Late Quaternary mega-lakes fed by the northern and southern river systems of central Australia: varying moisture sources and increased continental aridity |
title_sort |
late quaternary mega-lakes fed by the northern and southern river systems of central australia: varying moisture sources and increased continental aridity |
publisher |
Research Online |
publishDate |
2012 |
url |
https://ro.uow.edu.au/scipapers/4557 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Faculty of Science - Papers (Archive) |
op_relation |
https://ro.uow.edu.au/scipapers/4557 |
_version_ |
1766207249722638336 |