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Geology; September 2005; v. 33; no. 9; p. 757-760; DOI: 10.1130/G21654.1
© 2005 Geological Society of America
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Climate simulation of the latest Permian: Implications for mass extinction

Jeffrey T. Kiehl*,1 and Christine A. Shields*,1

1 Climate Change Research Section, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, Colorado 80305, USA

Life at the Permian-Triassic boundary (ca. 251 Ma) underwent the largest disruption in Earth's history. Paleoclimatic data indicate that Earth was significantly warmer than present and that much of the ocean was anoxic or euxinic for an extended period of time. We present results from the first fully coupled comprehensive climate model using paleogeography for this time period. The coupled climate system model simulates warm high-latitude surface air temperatures related to elevated carbon dioxide levels and a stagnate global ocean circulation in concert with paleodata indicating low oxygen levels at ocean depth. This is the first climate simulation that captures these observed features of this time period.

Key Words: Permian-Triassic boundary • mass extinctions • ocean circulation • anoxia




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