Toward a Cenozoic history of atmospheric CO<sub>2</sub>
2023
Hönisch, Bärbel | Royer, Dana | Breecker, Daniel | Polissar, Pratigya | Bowen, Gabriel | Henehan, Michael | Cui, Ying | Steinthorsdottir, Margret | Mcelwain, Jennifer | Kohn, Matthew | Pearson, Ann | Phelps, Samuel | Uno, Kevin | Ridgwell, Andy | Anagnostou, Eleni | Austermann, Jacqueline | Badger, Marcus | Barclay, Richard | Bijl, Peter | Chalk, Thomas, B | Scotese, Christopher | de la Vega, Elwyn | Deconto, Robert | Dyez, Kelsey | Ferrini, Vicki | Franks, Peter | Giulivi, Claudia | Gutjahr, Marcus | Harper, Dustin | Haynes, Laura | Huber, Matthew | Snell, Kathryn | Keisling, Benjamin | Konrad, Wilfried | Lowenstein, Tim | Malinverno, Alberto | Guillermic, Maxence | Mejía, Luz María | Milligan, Joseph | Morton, John | Nordt, Lee | Whiteford, Ross | Roth-Nebelsick, Anita | Rugenstein, Jeremy | Schaller, Morgan | Sheldon, Nathan | Sosdian, Sindia | Wilkes, Elise | Witkowski, Caitlyn | Zhang, Yi Ge | Anderson, Lloyd | Beerling, David | Bolton, Clara | Cerling, Thure | Cotton, Jennifer | Da, Jiawei | Ekart, Douglas | Foster, Gavin | Greenwood, David | Hyland, Ethan | Jagniecki, Elliot | Jasper, John | Kowalczyk, Jennifer | Kunzmann, Lutz | Kürschner, Wolfram | Lawrence, Charles | Lear, Caroline | Martínez-Botí, Miguel | Maxbauer, Daniel | Montagna, Paolo | Naafs, B. David A. | Rae, James | Raitzsch, Markus | Retallack, Gregory | Ring, Simon | Seki, Osamu | Sepúlveda, Julio | Sinha, Ashish | Tesfamichael, Tekie | Tripati, Aradhna | van der Burgh, Johan | Yu, Jimin | Zachos, James | Zhang, Laiming | Lamont-Doherty Earth Observatory (LDEO) ; Columbia University [New York] | University of Texas at Austin [Austin] | University of California [Santa Cruz] (UC Santa Cruz) ; University of California (UC) | Earth Surface Geochemistry [Postdam] ; German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) | Hong Kong University of Science and Technology (HKUST) | Harvard University | Columbia University [New York] | Department of Earth Sciences [Riverside] ; University of California [Riverside] (UC Riverside) ; University of California (UC)-University of California (UC) | Department of Earth Sciences [Utrecht] ; Universiteit Utrecht / Utrecht University [Utrecht] | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
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Show more [+] Less [-]English. The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO<sub>2</sub>) over long and short timescales, as well as potential drivers of evolutionary transitions. However, reconstructing CO<sub>2</sub> beyond direct measurements requires the use of paleoproxies and herein lies the challenge, as proxies differ in their assumptions, degree of understanding, and even reconstructed values. In this study, we critically evaluated, categorized, and integrated available proxies to create a high-fidelity and transparently constructed atmospheric CO<sub>2</sub> record spanning the past 66 million years. This newly constructed record provides clearer evidence for higher Earth system sensitivity in the past and for the role of CO<sub>2</sub> thresholds in biological and cryosphere evolution.
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