A 1500 year record of river discharge inferred from fluvial-marine sediments in the Australian subtropics

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dc.contributor.authorCoates-Marnane, J.
dc.contributor.authorOlley, J.
dc.contributor.authorTibby, J.
dc.contributor.authorBurton, J.
dc.contributor.authorHaynes, D.
dc.contributor.authorKemp, J.
dc.date.issued2018
dc.descriptionAvailable online 19 May 2018
dc.description.abstractIn Australia, there is a scarcity of high resolution hyrdoclimate reconstructions for the last several millennia. Fluvial-marine sediments offer a potential avenue for examining trends in freshwater input to coastal settings and, by inference, past hydroclimates. Here, major elemental geochemistry, δ¹³C and C:N ratios of organic matter, grain size and diatom species abundance, measured in a 4.4m long sediment core collected from Moreton Bay, in east coast Australia, are used to infer the relative freshwater discharge of the adjacent catchment over the last ~1500 years. Reduced freshwater discharge into the Bay occurred from 630 to 1200 CE, especially between 1100 and 1200 CE. A broad increase in discharge is indicated after 1300 CE, extending to the present. The initial shift to the prolonged wet period coincides with both a decrease in the frequency of ‘dry’ El Niño events based on regional records from the austral Pacific, and a broad hemispheric-scale cooling trend. This record provides further insight into low amplitude climate variability in the Australian subtropics over the last 1000 years, supporting efforts in both forecasting current and future climates, and managing regional water resources. Importantly, instrumental records do not cover the full range of natural climate variability experienced in the region over the last 1000 years.
dc.description.statementofresponsibilityJ. Coates-Marnane, J. Olley, J. Tibby, J. Burton, D. Haynes, J. Kemp
dc.identifier.citationPalaeogeography, Palaeoclimatology, Palaeoecology, 2018; 504:136-149
dc.identifier.doi10.1016/j.palaeo.2018.05.019
dc.identifier.issn0031-0182
dc.identifier.issn1872-616X
dc.identifier.orcidTibby, J. [0000-0002-5897-2932]
dc.identifier.urihttp://hdl.handle.net/2440/113061
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/LP120200093
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0990124
dc.rights© 2018 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.palaeo.2018.05.019
dc.subjectHolocene; palaeoclimate; flood; Brisbane River; Moreton Bay
dc.titleA 1500 year record of river discharge inferred from fluvial-marine sediments in the Australian subtropics
dc.typeJournal article
pubs.publication-statusPublished

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