Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes.
Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes.
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从铀同位素看第三纪始新世海床缺氧程度的上限。
DOI:
10.1038/s41467-020-20486-5
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发表时间:
2021-01-15
影响因子:
16.6
通讯作者:
Vance D
中科院分区:
文献类型:
--
作者:
Clarkson MO;Lenton TM;Andersen MB;Bagard ML;Dickson AJ;Vance D
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 expansion of oceanic anoxia during the Paleocene Eocene Thermal Maximum has important implications for faunal turnover patterns and global biogeochemical cycles. Here the authors use uranium isotopes and a biogeochemical model to suggest that the areal expansion of anoxia must have been limited to 10-fold.
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影响因子:
3.9
作者:
Andersen, M. B.;Vance, D.;Och, L.
通讯作者:
Och, L.
影响因子:
56.9
作者:
Bains, S;Corfield, RM;Norris, RD
通讯作者:
Norris, RD
DOI:
10.1073/pnas.2003197117
发表时间:
2020-09-29
影响因子:
11.1
作者:
Haynes, Laura L.;Honisch, Barbel
通讯作者:
Honisch, Barbel
影响因子:
5.8
作者:
Dickson, Alexander J.;Cohen, Anthony S.;Coe, Angela L.
通讯作者:
Coe, Angela L.
影响因子:
5
作者:
del Rey, Alvaro;Havsteen, Julius C.;Dahl, Tais W.
通讯作者:
Dahl, Tais W.