1. Climate model and proxy data constraints on ocean warming across the Paleocene-Eocene Thermal Maximum
- Author
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Dunkley Jones, T., Lunt, D.J., Schmidt, D.N., Ridgwell, A., Sluijs, A., Valdes, P.J., Maslin, M., Marine Palynology, and Marine palynology and palaeoceanography
- Subjects
PETM ,010504 meteorology & atmospheric sciences ,Effects of global warming on oceans ,Climate ,Earth and Planetary Sciences(all) ,Geographic variation ,010502 geochemistry & geophysics ,Eocene ,01 natural sciences ,Proxy (climate) ,HYDRATE DESTABILIZATION ,Taverne ,14. Life underwater ,TETRAETHER LIPIDS ,CIRCULATION CHANGES ,0105 earth and related environmental sciences ,PLANKTONIC-FORAMINIFERA ,MEMBRANE-LIPIDS ,CORE-TOP CALIBRATION ,Sea surface temperature ,SEAWATER CHEMISTRY ,13. Climate action ,CALCITE-ARAGONITE SEAS ,Climatology ,Greenhouse gas ,SEA-SURFACE TEMPERATURE ,Carbon isotope excursion ,General Earth and Planetary Sciences ,Climate sensitivity ,Paleocene ,Climate model ,SOUTHWEST PACIFIC-OCEAN ,Warming ,Geology - Abstract
Constraining the greenhouse gas forcing, climatic warming and estimates of climate sensitivity across ancient large transient warming events is a major challenge to the palaeoclimate research community. Here we provide a new compilation and synthesis of the available marine proxy temperature data across the largest of these hyperthermals, the Paleocene-Eocene Thermal Maximum (PETM). This includes the application of consistent temperature calibrations to all data, including the most recent set of calibrations for archaeal lipid-derived palaeothermometry. This compilation provides the basis for an informed discussion of the likely range of PETM warming, the biases present in the existing record and an initial assessment of the geographical pattern of PETM ocean warming. To aid interpretation of the geographic variability of the proxy-derived estimates of PETM warming, we present a comparison of this data with the patterns of warming produced by high pCO(2) simulations of Eocene climates using the Hadley Centre atmosphere-ocean general circulation model (AOGCM) HadCM3L On the basis of this comparison and taking into account the patterns of intermediate-water warming we estimate that the global mean surface temperature anomaly for the PETM is within the range of 4 to 5 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
- Published
- 2013
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