Deciphering the Palaeocene-Eocene thermal maximum by Granger causality test

Liu, Zeyang and Ji, Xiehua and Luo, Wenyan and Hu, Yuejie and Liu, Haoran (2022) Deciphering the Palaeocene-Eocene thermal maximum by Granger causality test. Geosystems and Geoenvironment, 2 (1). p. 100125. ISSN 2772-8838

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Abstract

The Palaeocene-Eocene thermal maximum is a global warming period (∼56 Ma), which is marked by a sharp negative carbon isotope excursion (CIE) that caused by the injection of massive isotopically-light carbon into the ocean-atmosphere. It is generally considered that the carbon injection caused global warming. However, several studies have suggested that warming and environmental perturbations precede the onset of the CIE. Here we present Granger test to investigate the detailed mechanisms of this event. We show a shift from climate-warming driving carbon-emission scenario to a scheme in which carbon-injection causing global-warming during the CIE. The initial carbon emission might be from methane hydrates dissociation and/or permafrost thawing, possibly linked with astronomical paced warming. This change of causal direction may result from the warming feedback of the emitted carbon and additional carbon from other sources, such as volcanism, bolide impact, oxidation of marine organic matter, and wildfires burning peatlands.

Item Type:	Article
Identification Number:	10.1016/j.geogeo.2022.100125
Dates:	Date Event 20 August 2022 Accepted 22 August 2022 Published Online
Uncontrolled Keywords:	Climate warming, Carbon emission, Gas hydrate, Oxygen isotope
Subjects:	CAH26 - geography, earth and environmental studies > CAH26-01 - geography, earth and environmental studies > CAH26-01-04 - environmental sciences CAH26 - geography, earth and environmental studies > CAH26-01 - geography, earth and environmental studies > CAH26-01-06 - earth sciences
Divisions:	Faculty of Business, Law and Social Sciences > College of Accountancy, Finance and Economics Faculty of Business, Law and Social Sciences > College of Business, Digital Transformation & Entrepreneurship
Depositing User:	Ji
Date Deposited:	31 Oct 2022 13:38
Last Modified:	20 Jun 2024 12:05
URI:	https://www.open-access.bcu.ac.uk/id/eprint/13690

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