Biogeosciences
Biogeosciences
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Articles | Volume 12, issue 12
Articles | Volume 12, issue 12
https://doi.org/10.5194/bg-12-3713-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-3713-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 12, issue 12
Research article
 | 
17 Jun 2015
Research article |  | 17 Jun 2015

Redox regime shifts in microbially mediated biogeochemical cycles

T. Bush, I. B. Butler, A. Free, and R. J. Allen

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Short summary
Despite their global importance, redox reactions mediated by microorganisms are often crudely represented in biogeochemical models. We show that including the dynamics of microbial growth in such a model can cause sudden shifts between redox states in response to an environmental change. We identify the conditions required for these redox regime shifts, and predict that they are likely in the modern day sulfur and nitrogen cycles, and potentially the iron cycle in the ancient ocean.
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