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A Double-Edged Sword: The Role of Sulfate in Anoxic Marine Phosphorus Cycling Through Earth History

Kipp, Michael A. (2022) A Double-Edged Sword: The Role of Sulfate in Anoxic Marine Phosphorus Cycling Through Earth History. Geophysical Research Letters, 49 (20). Art. No. e2022GL099817. ISSN 0094-8276. doi:10.1029/2022gl099817. https://resolver.caltech.edu/CaltechAUTHORS:20221116-601553800.2

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Abstract

Modern anoxic marine sediments release phosphorus (P) to seawater, driving feedbacks at multiple timescales. On sub-Myr timescales, anoxic P regeneration amplifies ocean deoxygenation; on multi-Myr timescales, it stabilizes atmospheric O₂. Some authors have extended this thinking to the Precambrian: by analogy, widespread ocean anoxia would imply extensive P regeneration from sediments. However, this neglects the role of sulfate in P regeneration. While abundant in seawater today, sulfate was scarce in the Precambrian. Here a simple model is used to isolate the role of sulfate in anoxic P cycling. The model reproduces known feedbacks driven by anoxic P regeneration in a high-sulfate world, but shows muted P regeneration in low-sulfate, anoxic sediments. The transition between “limited” and “enhanced” P regeneration is thus controlled by sulfate. As a result, sulfate is a double-edged sword wielded by the anoxic P cycle: it can amplify oxygenation or deoxygenation depending on environmental context.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2022GL099817DOIArticle
ORCID:
AuthorORCID
Kipp, Michael A.0000-0003-1844-3670
Additional Information:This work was financially supported by an Agouron Institute Postdoctoral Fellowship in Geobiology. The author thanks two anonymous reviewers for comments that improved the manuscript, as well as Angelicque White for editorial handling.
Funders:
Funding AgencyGrant Number
Agouron InstituteUNSPECIFIED
Issue or Number:20
DOI:10.1029/2022gl099817
Record Number:CaltechAUTHORS:20221116-601553800.2
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20221116-601553800.2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117884
Collection:CaltechAUTHORS
Deposited By: Research Services Depository
Deposited On:29 Nov 2022 15:57
Last Modified:29 Nov 2022 15:57

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