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Global analysis reveals climatic controls on the oxygen isotope composition of cave drip water

Barker, A, Hartmann, A, Duan, W, Hankin, S, Comas-Bru, L, Cuthbert, Mark O., Treble, P, Banner, J, Gentry, D, Baldini, L, Bartolome, M, Moreno, A, Pérez-Mejías, C and Werner, M 2019. Global analysis reveals climatic controls on the oxygen isotope composition of cave drip water. Nature Communications 10 , 2984. 10.1038/s41467-019-11027-w

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Abstract

The oxygen isotope composition of speleothems is a widely used proxy for past climate change. Robust use of this proxy depends on understanding the relationship between precipitation and cave drip water δ18O. Here, we present the first global analysis, based on data from 163 drip sites, from 39 caves on five continents, showing that drip water δ18O is most similar to the amount-weighted precipitation δ18O where mean annual temperature (MAT) is < 10 °C. By contrast, for seasonal climates with MAT > 10 °C and < 16 °C, drip water δ18O records the recharge-weighted δ18O. This implies that the δ18O of speleothems (formed in near isotopic equilibrium) are most likely to directly reflect meteoric precipitation in cool climates only. 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Nature Research
ISSN: 2041-1723
Date of First Compliant Deposit: 14 June 2019
Date of Acceptance: 14 June 2019
Last Modified: 06 Sep 2019 13:30
URI: http://orca.cf.ac.uk/id/eprint/123458

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