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Journal Article

Oceanic nutrient rise and the late Miocene inception of Pacific oxygen-deficient zones

MPS-Authors
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Auderset,  Alexandra
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Martinez-Garcia,  Alfredo
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Haug,  Gerald H.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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https://www.pnas.org/doi/pdf/10.1073/pnas.2204986119
(Publisher version)

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Citation

Wang, X. T., Yuwei, W., Auderset, A., Sigman, D. M., Ren, H., Martinez-Garcia, A., et al. (2022). Oceanic nutrient rise and the late Miocene inception of Pacific oxygen-deficient zones. Proceedings of the National Academy of Sciences of the United States of America, 119(45): e2204986119. doi:10.1073/pnas.2204986119.


Cite as: https://hdl.handle.net/21.11116/0000-000B-68A9-2
Abstract
The modern Pacific Ocean hosts the largest oxygen-deficient zones (ODZs), where oxygen concentrations are so low that nitrate is used to respire organic matter. The history of the ODZs may offer key insights into ocean deoxygenation under future global warming. In a 12-My record from the southeastern Pacific, we observe a >10‰ increase in foraminifera-bound nitrogen isotopes (15N/14N) since the late Miocene (8 to 9 Mya), indicating large ODZs expansion. Coinciding with this change, we find a major increase in the nutrient content of the ocean, reconstructed from phosphorus and iron measurements of hydrothermal sediments at the same site. Whereas global warming studies cast seawater oxygen concentrations as mainly dependent on climate and ocean circulation, our findings indicate that modern ODZs are underpinned by historically high concentrations of seawater phosphate.