P. Pogge von Strandmann
Global climate stabilisation by chemical weathering during the Hirnantian glaciation
Pogge von Strandmann, P.; Desrochers, A.; Murphy, M.J.; Finlay, A.J.; Selby, D.; Lenton, T.M.
Authors
A. Desrochers
M.J. Murphy
A.J. Finlay
Professor David Selby phdjpop@durham.ac.uk
Professor
T.M. Lenton
Abstract
Chemical weathering of silicate rocks is a primary drawdown mechanism of atmospheric carbon dioxide. The processes that affect weathering are therefore central in controlling global climate. A temperature-controlled “weathering thermostat” has long been proposed in stabilising long-term climate, but without definitive evidence from the geologic record. Here we use lithium isotopes (δ7Li) to assess the impact of silicate weathering across a significant climate-cooling period, the end-Ordovician Hirnantian glaciation (~445 Ma). We find a positive δ7Li excursion, suggestive of a silicate weathering decline. Using a coupled lithium-carbon model, we show that initiation of the glaciation was likely caused by declining CO2 degassing, which triggered abrupt global cooling, and much lower weathering rates. This lower CO2 drawdown during the glaciation allowed climatic recovery and deglaciation. Combined, the data and model provide support from the geological record for the operation of the weathering thermostat.
Citation
Pogge von Strandmann, P., Desrochers, A., Murphy, M., Finlay, A., Selby, D., & Lenton, T. (2017). Global climate stabilisation by chemical weathering during the Hirnantian glaciation. Geochemical perspectives letters, 3(2), 230-237. https://doi.org/10.7185/geochemlet.1726
Journal Article Type | Article |
---|---|
Acceptance Date | May 15, 2017 |
Online Publication Date | Jun 15, 2017 |
Publication Date | Jun 15, 2017 |
Deposit Date | Jun 7, 2017 |
Publicly Available Date | Jun 7, 2017 |
Journal | Geochemical Perspectives Letters |
Print ISSN | 2410-339X |
Electronic ISSN | 2410-3403 |
Publisher | European Association of Geochemistry (EAG) |
Peer Reviewed | Peer Reviewed |
Volume | 3 |
Issue | 2 |
Pages | 230-237 |
DOI | https://doi.org/10.7185/geochemlet.1726 |
Public URL | https://durham-repository.worktribe.com/output/1357722 |
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Copyright Statement
This work is distributed under the Creative Commons Attribution 4.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Additional information is available at http://www.
geochemicalperspectivesletters.org/copyright-and-permissions.
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