Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes.
Andersen, Morten B
Dickson, Alexander J
Springer Science and Business Media LLC
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Clarkson, M. O., Lenton, T. M., Andersen, M. B., Bagard, M., Dickson, A. J., & Vance, D. (2021). Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes.. Nat Commun, 12 (1) https://doi.org/10.1038/s41467-020-20486-5
The Paleocene Eocene Thermal Maximum (PETM) represents a major carbon cycle and climate perturbation that was associated with ocean de-oxygenation, in a qualitatively similar manner to the more extensive Mesozoic Oceanic Anoxic Events. Although indicators of ocean de-oxygenation are common for the PETM, and linked to biotic turnover, the global extent and temporal progression of de-oxygenation is poorly constrained. Here we present carbonate associated uranium isotope data for the PETM. A lack of resolvable perturbation to the U-cycle during the event suggests a limited expansion of seafloor anoxia on a global scale. We use this result, in conjunction with a biogeochemical model, to set an upper limit on the extent of global seafloor de-oxygenation. The model suggests that the new U isotope data, whilst also being consistent with plausible carbon emission scenarios and observations of carbon cycle recovery, permit a maximum ~10-fold expansion of anoxia, covering <2% of seafloor area.
Article, /704/47/4113, /704/47/4112, /704/106/2738, /704/106/413, /704/829/827, /140/58, /139, article
RCUK | NERC | British Antarctic Survey (BAS) (NE/N018508/1)
RCUK | Natural Environment Research Council (NERC) (NE/P013651/1, NE/K006223/1, NE/K006223/1)
External DOI: https://doi.org/10.1038/s41467-020-20486-5
This record's URL: https://www.repository.cam.ac.uk/handle/1810/316233
Attribution 4.0 International (CC BY 4.0)
Licence URL: https://creativecommons.org/licenses/by/4.0/