Recharge variability in Australia's southeast alpine region derived from cave monitoring and modern stalagmite δ18O records

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dc.contributor.authorTadros, CVen_AU
dc.contributor.authorMarkowska, Men_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorFrisia, Sen_AU
dc.contributor.authorAdler, L.en_AU
dc.contributor.authorDrysdale, RNen_AU
dc.date.accessioned2023-09-07T01:11:23Zen_AU
dc.date.available2023-09-07T01:11:23Zen_AU
dc.date.issued2022-11-01en_AU
dc.date.statistics2023-08-18en_AU
dc.description.abstractOxygen isotopic (δ18O) variations in stalagmite records have the potential to provide new insights about past climates beyond the instrumental record. This paper presents the first high-resolution oxygen isotope time series of three coeval stalagmite records from the alpine region of south-eastern Australia covering the period 1922–2006 CE. We use extended surface and cave monitoring datasets, petrographic investigation, modelled recharge time series and farmed calcite precipitates to assess the controls on speleothem δ18O and investigate the coherence between three records from Harrie Wood Cave. The drip water response to recent interannual rainfall variability shows that cave drip water Cl−, δ18O and drip rate display a clear response to an increase in rainfall recharge. It is demonstrated that stalagmites from the same drip sites also record variability in interannual recharge, where an increase in δ18O values is observed with lower recharge, while a decrease in δ18O values correspond to higher recharge amounts. The three stalagmite δ18O records are in broad agreement, showing common responses to relatively higher recharge between 1945 and 1995 CE and the low recharge periods between 1937 and 1945 CE (World War II drought) and late 1996 to 2006 CE (beginning of the Millennium Drought). However, differences in the magnitude of the relative response of each stalagmite δ18O record varies. Based on evidence from our cave monitoring study and farmed calcites, we conclude that the differences between the three stalagmite records is attributed to variability in the contribution of preferential flows during recharge events and the store reservoir volume supplying the drip site. When the δ18O decreases in response to enhanced recharge, the speleothem δ13C also decreases, and this is interpreted to reflect a soil respiration response to changes in soil moisture availability due to recharge. Hence, stalagmite δ18O from the Australian alpine region can be applied to reconstruct periods of relatively higher and lower rainfall recharge and thus extend our knowledge of the timing and relative magnitude of droughts as well as past periods of higher recharge in this region. Crown Copyright © 2022 Published by Elsevier Ltd.en_AU
dc.description.sponsorshipThe authors thank the NSW NPWS Yarrangobilly Caves manager and staff for their on-going collection of rainfall and drip water samples, Barbora Gallagher and Jennifer van Holst for their assistance in water isotope analyses and Stuart Hankin for assistance in generating Fig. 1.en_AU
dc.identifier.articlenumber107742en_AU
dc.identifier.citationTadros, C. V., Markowska, M., Treble, P. C., Baker, A., Frisia, S., Adler, L., & Drysdale, R. N. (2022). Recharge variability in Australia's southeast alpine region derived from cave monitoring and modern stalagmite δ18O records. Quaternary Science Reviews, 295, 107742. doi:10.1016/j.quascirev.2022.107742en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15102en_AU
dc.identifier.volume295en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.relation.urihttps://doi.org/10.1016/j.quascirev.2022.107742en_AU
dc.subjectOxygenen_AU
dc.subjectClimatesen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectAustraliaen_AU
dc.subjectStable isotopesen_AU
dc.subjectGroundwater rechargeen_AU
dc.subjectNew South Walesen_AU
dc.subjectCavesen_AU
dc.titleRecharge variability in Australia's southeast alpine region derived from cave monitoring and modern stalagmite δ18O recordsen_AU
dc.typeJournal Articleen_AU
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