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dc.contributor.authorHenehan, Michael J.
dc.contributor.authorRidgwell, Andy
dc.contributor.authorThomas, Ellen
dc.contributor.authorZhang, Shuang
dc.contributor.authorAlegret, Laia
dc.contributor.authorSchmidt, Daniela N.
dc.contributor.authorRae, James W. B.
dc.contributor.authorWitts, James D.
dc.contributor.authorLandman, Neil H.
dc.contributor.authorGreene, Sarah E.
dc.contributor.authorHuber, Brian T.
dc.contributor.authorSuper, James R.
dc.contributor.authorPlanavsky, Noah J.
dc.contributor.authorHull, Pincelli M.
dc.identifier.citationHenehan , M J , Ridgwell , A , Thomas , E , Zhang , S , Alegret , L , Schmidt , D N , Rae , J W B , Witts , J D , Landman , N H , Greene , S E , Huber , B T , Super , J R , Planavsky , N J & Hull , P M 2019 , ' Rapid ocean acidification and protracted Earth system recovery followed the end-Cretaceous Chicxulub impact ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 116 , no. 45 , pp. 22500-22504 .
dc.identifier.otherPURE: 262232604
dc.identifier.otherPURE UUID: e0bb6a3f-da1a-40ba-9e05-e5fda011320b
dc.identifier.otherBibtex: Henehan201905989
dc.identifier.otherPubMed: 31636204
dc.identifier.otherORCID: /0000-0003-3904-2526/work/63716842
dc.identifier.otherScopus: 85074467351
dc.identifier.otherWOS: 000494457400021
dc.descriptionJ.W.B.R. was supported by ERC Starting Grant 805246 OldCO2NewArchives.en
dc.description.abstractMass extinction at the Cretaceous–Paleogene (K-Pg) boundary coincides with the Chicxulub bolide impact and also falls within the broader time frame of Deccan trap emplacement. Critically, though, empirical evidence as to how either of these factors could have driven observed extinction patterns and carbon cycle perturbations is still lacking. Here, using boron isotopes in foraminifera, we document a geologically rapid surface-ocean pH drop following the Chicxulub impact, supporting impact-induced ocean acidification as a mechanism for ecological collapse in the marine realm. Subsequently, surface water pH rebounded sharply with the extinction of marine calcifiers and the associated imbalance in the global carbon cycle. Our reconstructed water-column pH gradients, combined with Earth system modeling, indicate that a partial ∼50% reduction in global marine primary productivity is sufficient to explain observed marine carbon isotope patterns at the K-Pg, due to the underlying action of the solubility pump. While primary productivity recovered within a few tens of thousands of years, inefficiency in carbon export to the deep sea lasted much longer. This phased recovery scenario reconciles competing hypotheses previously put forward to explain the K-Pg carbon isotope records, and explains both spatially variable patterns of change in marine productivity across the event and a lack of extinction at the deep sea floor. In sum, we provide insights into the drivers of the last mass extinction, the recovery of marine carbon cycling in a postextinction world, and the way in which marine life imprints its isotopic signal onto the geological record.
dc.relation.ispartofProceedings of the National Academy of Sciences of the United States of Americaen
dc.rightsCopyright © 2019 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).en
dc.subjectCretaceous/Paleogene boundaryen
dc.subjectOcean acidificationen
dc.subjectBoron isotopesen
dc.subjectMass extinctionen
dc.subjectGENIE modelen
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.titleRapid ocean acidification and protracted Earth system recovery followed the end-Cretaceous Chicxulub impacten
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.description.statusPeer revieweden

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