Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes

Clarkson, Matthew O., Lenton, Timothy M., Andersen, Morten B. ORCID:, Bagard, Marie-Laure, Dickson, Alexander J. and Vance, Derek 2021. Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes. Nature Communications 12 , 399. 10.1038/s41467-020-20486-5

[thumbnail of s41467-020-20486-5.pdf] PDF - Published Version
Available under License Creative Commons Attribution.

Download (976kB)


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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: Nature Research
ISSN: 2041-1723
Date of First Compliant Deposit: 8 December 2020
Date of Acceptance: 4 December 2020
Last Modified: 04 May 2023 19:56

Citation Data

Cited 15 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item


Downloads per month over past year

View more statistics