Assessing Volcanic Controls on Miocene Climate Change

Longman, Jack, Mills, Benjamin J. W., Donnadieu, Yannick and Goddéris, Yves (2022) Assessing Volcanic Controls on Miocene Climate Change. Geophysical Research Letters, 49 (2). e2021GL096519. ISSN 0094-8276

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The Miocene period saw substantially warmer Earth surface temperatures than today, particularly during a period of global warming called the Mid Miocene Climatic Optimum (MMCO; ∼17–15 Ma). However, the long-term drivers of Miocene climate remain poorly understood. By using a new continuous climate-biogeochemical model (SCION), we can investigate the interaction between volcanism, climate and biogeochemical cycles through the Miocene. We identify high tectonic CO2 degassing rates and further emissions associated with the emplacement of the Columbia River Basalt Group as the primary driver of the background warmth and the MMCO respectively. We also find that enhanced weathering of the basaltic terrane and input of explosive volcanic ash to the oceans are not sufficient to drive the immediate cooling following the MMCO and suggest that another mechanism, perhaps the change in ocean chemistry due to massive evaporite deposition, was responsible.

Item Type: Article
Additional Information: Funding Information: The authors appreciate the comments and suggestions of two anonymous reviewers, who helped to improve the manuscript. Benjamin J. W. Mills was funded by the UK Natural Environment Research Council grant NE/S009663/1. Yannick Donnadieu acknowledges the support of the French Research Agency (ANR) project AMOR (2016‐CE31‐020). Open access funding enabled and organized by Projekt DEAL.
Uncontrolled Keywords: biogeochemical modeling, Mid Miocene Climatic Optimum, SCION, tectonic forcing, volcanism, weathering feedbacks
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Rachel Branson
Date Deposited: 16 Feb 2023 15:00
Last Modified: 16 Feb 2023 15:00

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