1. Toward a Cenozoic history of atmospheric CO 2 .
- Author
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Hönisch B, Royer DL, Breecker DO, Polissar PJ, Bowen GJ, Henehan MJ, Cui Y, Steinthorsdottir M, McElwain JC, Kohn MJ, Pearson A, Phelps SR, Uno KT, Ridgwell A, Anagnostou E, Austermann J, Badger MPS, Barclay RS, Bijl PK, Chalk TB, Scotese CR, de la Vega E, DeConto RM, Dyez KA, Ferrini V, Franks PJ, Giulivi CF, Gutjahr M, Harper DT, Haynes LL, Huber M, Snell KE, Keisling BA, Konrad W, Lowenstein TK, Malinverno A, Guillermic M, Mejía LM, Milligan JN, Morton JJ, Nordt L, Whiteford R, Roth-Nebelsick A, Rugenstein JKC, Schaller MF, Sheldon ND, Sosdian S, Wilkes EB, Witkowski CR, Zhang YG, Anderson L, Beerling DJ, Bolton C, Cerling TE, Cotton JM, Da J, Ekart DD, Foster GL, Greenwood DR, Hyland EG, Jagniecki EA, Jasper JP, Kowalczyk JB, Kunzmann L, Kürschner WM, Lawrence CE, Lear CH, Martínez-Botí MA, Maxbauer DP, Montagna P, Naafs BDA, Rae JWB, Raitzsch M, Retallack GJ, Ring SJ, Seki O, Sepúlveda J, Sinha A, Tesfamichael TF, Tripati A, van der Burgh J, Yu J, Zachos JC, and Zhang L
- Abstract
The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO
2 ) over long and short timescales, as well as potential drivers of evolutionary transitions. However, reconstructing CO2 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 CO2 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 CO2 thresholds in biological and cryosphere evolution.- Published
- 2023
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