BAKER, Andy; HARTMANN, Andreas; DUAN, Wuhui; HANKIN, Stuart; COMAS-BRU, Laia; CUTHBERT, Mark; TREBLE, Pauline; BANNER, Jay; GENTY, Dominique; BALDINI, Lisa; BARTOLOMÉ, Miguel; MORENO, Ana; PÉREZ-MEJÍAS, Carlos; WERNER, Martin

doi:10.1038/s41467-019-11027-w

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Nature Communications. 2019-07-05, vol. 10

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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 δ 18 O. Here, we present the first global analysis, based on data from 163 drip sites, from 39 caves on five continents, showing that drip water δ 18 O is most similar to the amount-weighted precipitation δ 18 O where mean annual temperature (MAT) is 10°C and < 16°C, drip water δ 18 O records the recharge-weighted δ 18 O. This implies that the δ 18 O 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 δ 18 O of recharge periods and, in some cases, the extent of evaporative fractionation of stored karst water.< Réduire

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https://oskar-bordeaux.fr/handle/20.500.12278/188486

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http://dx.doi.org/10.1038/s41467-019-11027-w

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EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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

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Résumé en anglais

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