Global distribution and controls on cave drip water oxygen isotope composition

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dc.contributor.authorBaker, AAen_AU
dc.contributor.authorHartmann, Aen_AU
dc.contributor.authorDuan, WHen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorComas-Bru, Len_AU
dc.contributor.authorCuthbert, MOen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBanner, Jen_AU
dc.contributor.authorGenty, 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.accessioned2020-06-11T06:42:43Zen_AU
dc.date.available2020-06-11T06:42:43Zen_AU
dc.date.issued2018-12-10en_AU
dc.date.statistics2020-06-01en_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 d18O. Here, we present the first global analysis, based on data from 148 drip sites, 38 caves, and five continents. Globally, drip water d18O is most similar to the amount-weighted precipitation d18O where mean annual temperature (MAT) is < 10 °C. For seasonal climates with MAT > 10 °C and < 16 °C, we demonstrate that drip water d18O records the recharge-weighted d18O. Our analysis implies that speleothems (formed in near isotopic equilibrium) are most likely to have d18O that directly reflect meteoric precipitation only in cool climates. In warmer and drier environments, speleothems will have a seasonal bias toward the precipitation d18O of recharge periods and, in some cases, the extent of evaporative fractionation of stored karst water. We highlight the implications of our analysis for the interpretation of oxygen isotope records in Australasian speleothems. © The Authorsen_AU
dc.identifier.citationBaker, A., Hartmann, A., Duan, W., Hankin, S., Comas-Bru, L., Cuthbert, M. O., Treble, P. C., Banner, J., Genty, D., Baldini, L., Bartolomé, M., Moreno, A., & Pérez-Mejías, C. (2018). Global distribution and controls on cave drip water oxygen isotope composition. Paper presented at the AQUA Biennial Conference, Canberra, 10-14th December 2018. (pp. 21). https://aqua.org.au/wp-content/uploads/2019/10/AQUA-2018-Program.pdfen_AU
dc.identifier.conferenceenddate14 December 2018en_AU
dc.identifier.conferencenameAQUA Biennial Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate10 December 2018en_AU
dc.identifier.govdoc9632en_AU
dc.identifier.pagination21en_AU
dc.identifier.urihttps://aqua.org.au/wp-content/uploads/2019/10/AQUA-2018-Program.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9584en_AU
dc.language.isoenen_AU
dc.publisherAustralasian Quaternary Association Incen_AU
dc.subjectCavesen_AU
dc.subjectAustraliaen_AU
dc.subjectWateren_AU
dc.subjectOxygenen_AU
dc.subjectIsotopesen_AU
dc.subjectClimatesen_AU
dc.subjectMonsoonsen_AU
dc.subjectAsiaen_AU
dc.subjectGlaciersen_AU
dc.subjectThermodynamic cyclesen_AU
dc.subjectPrecipitationen_AU
dc.titleGlobal distribution and controls on cave drip water oxygen isotope compositionen_AU
dc.typeConference Abstracten_AU
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