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

Title: Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event.
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Name(s): Them, Theodore R, author
Gill, Benjamin C, author
Selby, David, author
Gröcke, Darren R, author
Friedman, Richard M, author
Owens, Jeremy D, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-07-10
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 pCO levels on geologically short timescales (10-10 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 CO. 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 pCO levels. Therefore, the enhanced weathering modulated by initially increased pCO levels would have operated as both a direct and indirect negative feedback to end the T-OAE.
Identifier: FSU_pmch_28694487 (IID), 10.1038/s41598-017-05307-y (DOI), PMC5504049 (PMCID), 28694487 (RID), 28694487 (EID), 10.1038/s41598-017-05307-y (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5504049.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28694487
Owner Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: iss. 1, vol. 7

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Them, T. R., Gill, B. C., Selby, D., Gröcke, D. R., Friedman, R. M., & Owens, J. D. (2017). Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28694487