Global distribution and controls on cave drip water oxygen isotope composition

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dc.contributor.authorBaker, AAen_AU
dc.contributor.authorComas-Bru, Len_AU
dc.contributor.authorHartmann, Aen_AU
dc.contributor.authorDuan, WHen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorCuthbert, MOen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBanner, Jen_AU
dc.contributor.authorGentry, Den_AU
dc.contributor.authorBaldini, LMen_AU
dc.contributor.authorBartolomé, Men_AU
dc.contributor.authorMoreno, Aen_AU
dc.contributor.authorPérez-Mejías, Cen_AU
dc.date.accessioned2023-06-06T03:50:51Zen_AU
dc.date.available2023-06-06T03:50:51Zen_AU
dc.date.issued2019-07-30en_AU
dc.date.statistics2023-03-24en_AU
dc.description.abstractThe oxygen isotope composition of speleothems is a widely utilised paleoclimate proxy that is responsible for the current state-of-knowledge of past Asian monsoon dynamics, the timing of glacial-interglacial cycles, and the insolation control on inter-tropical convergence zone position, among other climate processes. Because speleothems are deposited by cave drip water, and this is derived from meteoric precipitation, it is critical to understand the empirical relationship between precipitation and cave drip water δ18O. Here, we present the first global analysis, based on data from 148 drip sites, 38 caves, and five continents. Globally, drip water δ18O is most similar to the amount-weighted precipitation δ18O where mean annual temperature (MAT) is < 10 °C. For seasonal climates with MAT > 10 °C and < 16 °C, we demonstrate that drip water δ18O records the recharge-weighted δ18O. Our analysis implies that speleothems (formed in near isotopic equilibrium) are most likely to have δ18O that directly reflect meteoric precipitation only in cool climates. In warmer and drier environments, speleothems will have a seasonal bias toward the precipitation δ18O of recharge periods and, in some cases, the extent of evaporative fractionation of stored karst water.en_AU
dc.identifier.citationBaker, A., Comas-Bru, L., Hartmann, A., Duan, W., Hankin, S., Cuthbert, M., Treble, P., Banner, J., Genty, D., Baldini, L., Bartolomé, M., Moreno, A., & Perez-Mejias, C. (2019). Global distribution and controls on cave drip water oxygen isotope composition. Paper presented to the 20th INQUA Congress 25th - 31st July 2019, Dublin, Ireland. Retrieved from: https://virtual.oxfordabstracts.com/#/event/public/574/submission/1432en_AU
dc.identifier.conferenceenddate31 July 2019en_AU
dc.identifier.conferencename20th INQUA Congressen_AU
dc.identifier.conferenceplaceDublin, Irelanden_AU
dc.identifier.conferencestartdate25 July 2019en_AU
dc.identifier.urihttps://virtual.oxfordabstracts.com/#/event/public/574/submission/1432en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15048en_AU
dc.language.isoenen_AU
dc.publisherInternational Union for Quaternary Research (INQUA)en_AU
dc.subjectCavesen_AU
dc.subjectWateren_AU
dc.subjectOxygen isotopesen_AU
dc.subjectGlaciersen_AU
dc.subjectClimatesen_AU
dc.subjectEnvironmenten_AU
dc.titleGlobal distribution and controls on cave drip water oxygen isotope compositionen_AU
dc.typeConference Presentationen_AU
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