A palaeoclimatic rainfall history from Lake Broadwater, southeast Queensland, Australia
Article
Article Title | A palaeoclimatic rainfall history from Lake Broadwater, southeast Queensland, Australia |
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ERA Journal ID | 2112 |
Article Category | Article |
Authors | Cottrill, D. A. (Author), Ribbe, J. (Author), Maron, M. (Author) and Jacobsen, G. (Author) |
Journal Title | Proceedings of the Royal Society of Queensland |
Journal Citation | 119, pp. 35-43 |
Number of Pages | 9 |
Year | 2014 |
Publisher | Royal Society of Queensland |
Place of Publication | Australia |
ISSN | 0080-469X |
Web Address (URL) | https://search.informit.org/doi/epdf/10.3316/informit.488746966518317 |
Abstract | A palaeoclimatic Holocene rainfall history is reported for Lake Broadwater in southeast Queensland, Australia. This naturally-occurring semi-permanent freshwater lake is part of the Condamine-Balonne Catchment on the Darling Downs. It is an important natural habitat for waterbirds and other wildlife, but it dried-out completely during the Australian Millennium Drought. Lake sediments were sampled to a depth of about 1.7 m from the centre of the lake in March 2007. A detailed chronology developed from radiocarbon (14C) dating indicates that sedimentation was fairly constant into the lake and averaged ~0.16 mm year-1 since about 11 kyr cal B.P. An interpretation of the palaeoclimatic record indicates higher rainfall and moist conditions prevailed from ~11 kyr to ~3.5 kyr cal B.P., followed by lower rainfall, decreasing further from ~2.2 kyr cal B.P to the present day. This change to drier conditions most likely reflects an increase in El Niño–Southern Oscillation (ENSO) cycles which began in the mid–late Holocene and has been identified from other proxy records elsewhere in eastern Australia. The change to a lower rainfall regime suggests large-scale ocean/atmospheric circulation changes affecting not only coastal regions, but also inland regions of eastern Australia including the northern parts of the Murray–Darling Basin. |
Keywords | Australia, rainfall, palaeoclimatology, climate, Holocene, El Nino Southern Oscillation |
ANZSRC Field of Research 2020 | 370904. Palaeoclimatology |
370202. Climatology | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | International Centre for Applied Climate Science |
University of Queensland | |
Australian Nuclear Science and Technology Organisation | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q300z/a-palaeoclimatic-rainfall-history-from-lake-broadwater-southeast-queensland-australia
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