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Extreme warming of tropical waters during the Paleocene Eocene Thermal Maximum

Extreme warming of tropical waters during the Paleocene Eocene Thermal Maximum

Aze, T.;Pearson, P. N.;Dickson, A. J.;Badger, M. P. S.;Bown, P. R.;Pancost, R. D.;Gibbs, S. J.;Huber, Brian T.;Leng, M. J.;Coe, A. L.;Cohen, A. S.;Foster, G. L.
DOI: https://doi.org/10.1130/G35637.1
Date: 2014

Abstract:

The Paleocene Eocene Thermal Maximum (PETM), ca. 56 Ma, was a major global environmental perturbation attributed to a rapid rise in the concentration of greenhouse gases in the atmosphere. Geochemical records of tropical sea-surface temperatures (SSTs) from the PETM are rare and are typically affected by post-depositional diagenesis. To circumvent this issue, we have analyzed oxygen isotope ratios (d18O) of single specimens of exceptionally well-preserved planktonic foraminifera from the PETM in Tanzania (~19°S paleolatitude), which yield extremely low d18O, down to 3 °C during the PETM and may have exceeded 40 °C. Calcareous plankton are absent from a large part of the Tanzania PETM record; extreme environmental change may have temporarily caused foraminiferal exclusion.

Citation:

Aze, T., Pearson, P. N., Dickson, A. J., Badger, M. P. S., Bown, P. R., Pancost, R. D., Gibbs, S. J., Huber, Brian T., Leng, M. J., Coe, A. L., Cohen, A. S., and Foster, G. L. 2014. "Extreme warming of tropical waters during the Paleocene–Eocene Thermal Maximum." Geology. 42 (9):739–742. https://doi.org/10.1130/G35637.1

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