Holocene climate variability in south-eastern Australia; inferred from oxygen isotopes in sedimentary cellulose at Lake Surprise, Victoria

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dc.contributor.authorDharmarathna, Aen_AU
dc.contributor.authorTyler, JJen_AU
dc.contributor.authorBarr, Cen_AU
dc.contributor.authorTibby, Jen_AU
dc.contributor.authorJones, MDen_AU
dc.contributor.authorAnkor, MJen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorChild, DPen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorZolitschka, Ben_AU
dc.contributor.authorCadd, Hen_AU
dc.date.accessioned2024-04-09T05:14:15Zen_AU
dc.date.available2024-04-09T05:14:15Zen_AU
dc.date.issued2021-07-08en_AU
dc.date.statistics2023-02-02en_AU
dc.description.abstractDuring the Holocene, south-eastern Australia experienced periods of multi-year drought. However, the scarcity of quantitative, high-resolution climate records from the region means understanding of the frequency and intensity of such events is limited. Where conditions are suitable, oxygen isotopes preserved in lake sediments are a useful tool for reconstructing past climate and environmental conditions. Here, we present preliminary results from a ca. 8700 ka record from Lake Surprise in western Victoria, from which we analysed δ18O of aquatic cellulose, alongside organic carbon/nitrogen ratios, organic carbon isotopes and XRF (ITRAX) inferred elemental composition. Our interpretation of the palaeo- data is supported by ~3 monthly monitoring of water and sediment geochemistry to track the modern hydrology of the lake. Our preliminary results show a strong positive correlation between meteorological precipitation data and sedimentary calcium (carbonate deposition) over the last 150 years, likely linked to changes in primary productivity. As a proxy for lake-water δ18O, the aquatic cellulose δ18O record is also correlated with carbonate concentration, reinforcing our interpretation of CaCO3 deposition in the lake during wet periods. The cellulose δ18O record indicates a trend of gradually increasing aridity over the last 8 ka, with a notable extremely wet period ca. 7.5–7 ka and a dry period ca 2–1.5 ka. Further work will focus on increasing the resolution of the data to better identify the frequency and duration of key events and quantifying natural hydroclimatic variability, alongside continued geochemical monitoring and modelling to better constrain the interpretation of the palaeoclimate record.en_AU
dc.identifier.citationDharmarathna, A., Tyler, J. J., Barr, C., Tibby, J., Jones, M. D., Ankor, M. J., Gadd, P., Hua, Q., Child, D., Zawadski, A., Hotchkis, M., Zolitschka, B. & Cadd, H. (2021). Holocene climate variability in south-eastern Australia; inferred from oxygen isotopes in sedimentary cellulose at Lake Surprise, Victoria. Paper presented to the Australasian Quaternary Association/Friends of the Pleistocene Pop-up Conference 2021, 8-9th July 2021. Retrieved from: http://aqua.org.au/wp-content/uploads/2021/07/Abstract-book-2021-1.pdfen_AU
dc.identifier.conferenceenddate2021-07-09en_AU
dc.identifier.conferencenameAustralasian Quaternary Association/Friends of the Pleistocene Pop-up Conference 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-07-08en_AU
dc.identifier.urihttp://aqua.org.au/wp-content/uploads/2021/07/Abstract-book-2021-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15554en_AU
dc.language.isoenen_AU
dc.publisherAustralasian Quaternary Association (AQUA)en_AU
dc.subjectQuaternary perioden_AU
dc.subjectClimatesen_AU
dc.subjectAustraliaen_AU
dc.subjectDroughtsen_AU
dc.subjectVictoriaen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectSedimentsen_AU
dc.subjectLakesen_AU
dc.subjectEnvironmenten_AU
dc.subjectEcologyen_AU
dc.subjectCelluloseen_AU
dc.titleHolocene climate variability in south-eastern Australia; inferred from oxygen isotopes in sedimentary cellulose at Lake Surprise, Victoriaen_AU
dc.typeConference Abstracten_AU
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