A detailed study of Holocene climate variability in south-east Australia based on cellulose inferred lake water isotopes and monitoring and modelling approach at Lake Surprise, western Victoria.

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dc.contributor.authorDharmarathma, Aen_AU
dc.contributor.authorTyler, JJen_AU
dc.contributor.authorTibby, Jen_AU
dc.contributor.authorBarr, Cen_AU
dc.contributor.authorCadd, Hen_AU
dc.contributor.authorAnkor, MJen_AU
dc.contributor.authorJones, MDen_AU
dc.contributor.authorTadros, CVen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorChild, DPen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorKlaeb, RMen_AU
dc.contributor.authorHall, Ten_AU
dc.date.accessioned2023-03-30T22:04:59Zen_AU
dc.date.available2023-03-30T22:04:59Zen_AU
dc.date.issued2022-12-06en_AU
dc.date.statistics2023-03-28en_AU
dc.description.abstractDuring the Holocene, southeast Australia experienced intense climate conditions including extended droughts. However, knowledge of the frequency and intensity of such episodes is restricted due to the scarcity of quantitative, high-resolution climate records from the region. Where conditions are possible, oxygen isotopes preserved in lake sediments are a useful tool for retracing the past climatic and environment. Here we present a well-dated, highly resolved Holocene record based on δ18O values of aquatic cellulose, alongside organic carbon isotopes and carbon/nitrogen ratios from sediments at Lake Surprise in western Victoria. Our interpretation of the palaeo-data is supported by both monitoring of water and sediment accumulation and lake isotope mass balance modelling to track the modern hydrology of the lake. The lake is highly groundwater dependant alongside its evaporative enrichment of major ions and stable isotopes. The cellulose record indicates a trend of gradually increasing aridity towards the present day, with notable extreme wet periods prevailing from 10900 – 10000, 7600 – 7000 and 5600 – 4500 cal yr BP. the lake represent a significant climate transition to towards aridity at 4500 cal yr BP and remained consistent over the last 4000 years, along with the driest period recorded from 2000 – 1550 cal yr BP. while our record is consistent with other studies from western Victoria, we demonstrate a strong coherence with SWW variability suggesting that the southern Ocean processes were the dominant controls of Holocene climate change at least over the study area. Further, we suggest an increasing influence of ENSO and IOD during the last two millennia. Our record also agrees with the pattern of variation in solar forcing to some extent which may symbolize a connection to proxy data and climate drivers. However, detailed analyses focused on solar activity and climate modes are required to understand teleconnections among these climate drivers and their mechanisms.en_AU
dc.identifier.citationDharmarathna, A., Tyler, Jonathan J., Tibby, J., Barr, C,. Cadd, H,. Ankor, M., Jones, Matthew D., Tadros, C., Hua, Q., Child, D., Zawadzki, A., Hotchkis, M., Gadd, P., Klaeb, R., & Hall, T. (2022). A detailed study of Holocene climate variability in south-east Australia based on cellulose inferred lake water isotopes and monitoring and modelling approach at Lake Surprise, western Victoria. Paper presented to the AQUA 2022 Conference, 6-8th December, Adelaide (pp. 39-40). Retrieved from: https://aqua.org.au/conference/aqua-2022/aqua-2022-conference-program-and-abstracts/en_AU
dc.identifier.conferenceenddate8 December 2022en_AU
dc.identifier.conferencenameAQUA 2022 Conferenceen_AU
dc.identifier.conferenceplaceAdelaideen_AU
dc.identifier.conferencestartdate6 December 2022en_AU
dc.identifier.pagination39-40en_AU
dc.identifier.urihttps://aqua.org.au/conference/aqua-2022/aqua-2022-conference-program-and-abstracts/en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14762en_AU
dc.language.isoenen_AU
dc.publisherAustralasian Quaternary Association Inc.en_AU
dc.subjectAustraliaen_AU
dc.subjectClimatesen_AU
dc.subjectDroughtsen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectCarbon isotopesen_AU
dc.subjectVictoriaen_AU
dc.subjectLakesen_AU
dc.subjectCelluloseen_AU
dc.subjectSolar activityen_AU
dc.subjectGround wateren_AU
dc.titleA detailed study of Holocene climate variability in south-east Australia based on cellulose inferred lake water isotopes and monitoring and modelling approach at Lake Surprise, western Victoria.en_AU
dc.typeConference Abstracten_AU
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