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Assessing the contributions of comet impact and volcanism toward the climate perturbations of the Paleocene‐Eocene thermal maximum.

Liu, Zeyang and Horton, Daniel E. and Tabor, Clay and Sageman, Bradley B. and Percival, Lawrence M.E. and Gill, Benjamin C. and Selby, David (2019) 'Assessing the contributions of comet impact and volcanism toward the climate perturbations of the Paleocene‐Eocene thermal maximum.', Geophysical research letters., 46 (24). pp. 14798-14806.

Abstract

The Paleocene‐Eocene Thermal Maximum is marked by a prominent negative carbon‐isotope excursion, reflecting the injection of thousands of gigatons of isotopically light carbon into the atmosphere. The sources of the isotopically light carbon remain poorly constrained. Utilizing a multiproxy geochemical analysis (osmium isotopes, mercury, sulfur, and platinum group elements) of two Paleocene‐Eocene boundary records, we present evidence that a comet impact and major volcanic activity likely contributed to the environmental perturbations during the Paleocene‐Eocene interval. Additionally, Earth system model simulations indicate that stratospheric sulfate aerosols, commensurate with the impact magnitude, were likely to have caused transient cooling and reduced precipitation. Plain Language Summary The Paleocene‐Eocene Thermal Maximum (~55.9 Ma) records a period of climate warming associated with the injection of thousands of gigatons of carbon into the atmosphere. However, the sources of the carbon are still unclear. Our study uses geochemical data (osmium isotopes, mercury, sulfur, and platinum group elements) of two North Atlantic Ocean drill cores across the Paleocene‐Eocene interval to suggest that both a comet impact and large‐scale volcanism occurred at that time. The comet is estimated to be small (~3.3 km diameter) with ~0.4 Gt carbon and thus cannot be responsible for the Paleocene‐Eocene Thermal Maximum. However, climate modeling suggests that the comet impact might have caused transient cooling and reduced precipitation.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1029/2019GL084818
Publisher statement:Liu, Zeyang, Horton, Daniel E., Tabor, Clay, Sageman, Bradley B., Percival, Lawrence M.E., Gill, Benjamin C. & Selby, David (2019). Assessing the Contributions of Comet Impact and Volcanism Toward the Climate Perturbations of the Paleocene‐Eocene Thermal Maximum. Geophysical Research Letters 46(24): 14798-14806. 10.1029/2019GL084818. To view the published open abstract, go to https://doi.org/ and enter the DOI.
Date accepted:17 December 2019
Date deposited:14 January 2020
Date of first online publication:27 December 2019
Date first made open access:27 June 2020

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