Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event

Abstract Chemical weathering consumes atmospheric carbon dioxide through the breakdown of silicate minerals and is thought to stabilize Earth’s long-term climate. However, the potential influence of silicate weathering on atmospheric pCO2 levels on geologically short timescales (103–105 years) remai...

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Autores principales:	Theodore R. Them, Benjamin C. Gill, David Selby, Darren R. Gröcke, Richard M. Friedman, Jeremy D. Owens
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/79f10142702f4819ac351aec82b4549f
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spelling	oai:doaj.org-article:79f10142702f4819ac351aec82b4549f2021-12-02T11:41:11ZEvidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event10.1038/s41598-017-05307-y2045-2322https://doaj.org/article/79f10142702f4819ac351aec82b4549f2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05307-yhttps://doaj.org/toc/2045-2322Abstract Chemical weathering consumes atmospheric carbon dioxide through the breakdown of silicate minerals and is thought to stabilize Earth’s long-term climate. However, the potential influence of silicate weathering on atmospheric pCO2 levels on geologically short timescales (103–105 years) remains poorly constrained. Here we focus on the record of a transient interval of severe climatic warming across the Toarcian Oceanic Anoxic Event or T-OAE from an open ocean sedimentary succession from western North America. Paired osmium isotope data and numerical modelling results suggest that weathering rates may have increased by 215% and potentially up to 530% compared to the pre-event baseline, which would have resulted in the sequestration of significant amounts of atmospheric CO2. This process would have also led to increased delivery of nutrients to the oceans and lakes stimulating bioproductivity and leading to the subsequent development of shallow-water anoxia, the hallmark of the T-OAE. This enhanced bioproductivity and anoxia would have resulted in elevated rates of organic matter burial that would have acted as an additional negative feedback on atmospheric pCO2 levels. Therefore, the enhanced weathering modulated by initially increased pCO2 levels would have operated as both a direct and indirect negative feedback to end the T-OAE.Theodore R. ThemBenjamin C. GillDavid SelbyDarren R. GröckeRichard M. FriedmanJeremy D. OwensNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Theodore R. Them Benjamin C. Gill David Selby Darren R. Gröcke Richard M. Friedman Jeremy D. Owens Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
description	Abstract Chemical weathering consumes atmospheric carbon dioxide through the breakdown of silicate minerals and is thought to stabilize Earth’s long-term climate. However, the potential influence of silicate weathering on atmospheric pCO2 levels on geologically short timescales (103–105 years) remains poorly constrained. Here we focus on the record of a transient interval of severe climatic warming across the Toarcian Oceanic Anoxic Event or T-OAE from an open ocean sedimentary succession from western North America. Paired osmium isotope data and numerical modelling results suggest that weathering rates may have increased by 215% and potentially up to 530% compared to the pre-event baseline, which would have resulted in the sequestration of significant amounts of atmospheric CO2. This process would have also led to increased delivery of nutrients to the oceans and lakes stimulating bioproductivity and leading to the subsequent development of shallow-water anoxia, the hallmark of the T-OAE. This enhanced bioproductivity and anoxia would have resulted in elevated rates of organic matter burial that would have acted as an additional negative feedback on atmospheric pCO2 levels. Therefore, the enhanced weathering modulated by initially increased pCO2 levels would have operated as both a direct and indirect negative feedback to end the T-OAE.
format	article
author	Theodore R. Them Benjamin C. Gill David Selby Darren R. Gröcke Richard M. Friedman Jeremy D. Owens
author_facet	Theodore R. Them Benjamin C. Gill David Selby Darren R. Gröcke Richard M. Friedman Jeremy D. Owens
author_sort	Theodore R. Them
title	Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
title_short	Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
title_full	Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
title_fullStr	Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
title_full_unstemmed	Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
title_sort	evidence for rapid weathering response to climatic warming during the toarcian oceanic anoxic event
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/79f10142702f4819ac351aec82b4549f
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Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event

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