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

Andy Baker*, Andreas Hartmann, Wuhui Duan, Stuart Hankin, Laia Comas-Bru, Mark O Cuthbert, Pauline C Treble, Jay Banner, Dominique Genty, Lisa M Baldini, Miguel Bartolomé, Ana Moreno, Carlos Pérez-Mejías, Martin Werner

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)
182 Downloads (Pure)


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.

Original languageEnglish
Article number2984
Number of pages7
JournalNature Communications
Issue number1
Publication statusPublished - 5 Jul 2019

Fingerprint Dive into the research topics of 'Global analysis reveals climatic controls on the oxygen isotope composition of cave drip water'. Together they form a unique fingerprint.

Cite this