Matthew O Clarkson1, Timothy M Lenton2, Morten B Andersen3, Marie-Laure Bagard4,5, Alexander J Dickson6, Derek Vance7. 1. Department of Earth Sciences, ETHZ, 8092, Zurich, Switzerland. matthew.clarkson@erdw.ethz.ch. 2. Global Systems Institute, University of Exeter, Exeter, EX4 4QE, UK. 3. School of Earth and Ocean Sciences, University of Cardiff, Cardiff, CF10 3AT, UK. 4. School of Environment, Earth and Ecosystem Sciences, The Open University, Milton Keynes, MK7 6AA, UK. 5. Department of Earth Science, University of Cambridge, Cambridge, CB2 3EQ, UK. 6. Department of Earth Sciences, Royal Holloway University of London, Egham, TW20 0EX, UK. 7. Department of Earth Sciences, ETHZ, 8092, Zurich, Switzerland.
Abstract
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.
The Paleocene Eocene Thermal Maximum (pan class="Chemical">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.
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