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- PP51A-01: Floral Trends, Conifer Physiognomy, pCO2, and Hydrological Proxies Track “Climatic Whiplash” During CAMP Volcanism at the End-Triassic Mass Extinction (invited)
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NOLA CC
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Jessica Whiteside, San Diego State University (First Author, Presenting Author)
Paul Olsen, Lamont-Doherty Earth Observatory
Morgan Schaller, Rensselaer Polytechnic Institute
Near-planetary-scale volcanic episodes associated with breakup of the supercontinent of Pangea spewed forth both heat-trapping greenhouse gases and sunlight-blocking sulfur dioxide aerosols 201.6 million years ago during the end-Triassic mass extinction. Although the overall trend was warming due to increased carbon dioxide in the atmosphere, there were also shorter-term cooling periods interspersed, resulting in rapid and dramatic shifts in climatic conditions (a 'climatic whiplash') that show up in elemental and molecular reconstructions of atmospheric carbon dioxide, hydrology, the structure and leaf shapes of fossil plants, and the rise to ecological dominance of downy dinosaurs and pterosaurs at the expense of all large, naked pseudosuchians.
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