A 35 ka record of groundwater recharge in south-west Australia using stable water isotopes

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dc.contributor.authorPriestley, SCen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorGriffiths, ADen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorPigois, JPen_AU
dc.date.accessioned2021-03-04T00:53:54Zen_AU
dc.date.available2021-03-04T00:53:54Zen_AU
dc.date.issued2020-05-15en_AU
dc.date.statistics2021-03-04en_AU
dc.description.abstractThe isotopic composition of groundwater can be a useful indicator of recharge conditions and may be used as an archive to infer past climate variability. Groundwater from two largely confined aquifers in south-west Australia, recharged at the northernmost extent of the westerly wind belt, can help constrain the palaeoclimate record in this region. We demonstrate that radiocarbon age measurements of dissolved inorganic carbon are appropriate for dating groundwater from the Leederville aquifer and Yarragadee aquifer within the Perth Basin. Variations in groundwater δ18O values with mean residence time were examined using regional and flow line data sets, which were compared. The trends in the regional groundwater data are consistent with the groundwater flow line data supporting the hypothesis that groundwater δ18O is a robust proxy for palaeo-recharge in the Perth Basin. A comparison between modern groundwater and rainfall water isotopes indicates that recharge is biased to months with high volume and/or intense rainfall from the westerly wind circulation and that this has been the case for the last 35 ka. Lower stable water isotope values are interpreted to represent recharge from higher volume and/or more intense rainfall from 35 ka through the Last Glacial Maximum period although potentially modulated by changes in recharge thresholds. The Southern Perth Basin groundwater isotopic record also indicates a trend towards higher volume and/or intense rainfall during the Mid- to Late Holocene. The long-term stable water isotope record provides an understanding of groundwater palaeo-recharge. Knowledge of recharge dynamics over long time scales can be used to improve current water sharing plans and future groundwater model predictions. © Crown Copyright 2019en_AU
dc.identifier.articlenumber135105en_AU
dc.identifier.citationPriestley, S. C., Meredith, K. T., Treble, P. C., Cendón, D. I., Griffiths, A. D., Hollins, S. E., Baker, A., & Pigois, J.-P. (2020). A 35 ka record of groundwater recharge in south-west Australia using stable water isotopes. Science of The Total Environment, 717, 135105. doi:10.1016/j.scitotenv.2019.135105en_AU
dc.identifier.issn0048-9697en_AU
dc.identifier.journaltitleScience of The Total Environmenten_AU
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2019.135105en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10476en_AU
dc.identifier.volume717en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectAustraliaen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectIsotopesen_AU
dc.subjectGround wateren_AU
dc.subjectAge estimationen_AU
dc.subjectWestern Australiaen_AU
dc.subjectSedimentary basinsen_AU
dc.subjectAquifersen_AU
dc.subjectWinden_AU
dc.titleA 35 ka record of groundwater recharge in south-west Australia using stable water isotopesen_AU
dc.typeJournal Articleen_AU
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