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
Vance D
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Clarkson MO;Lenton TM;Andersen MB;Bagard ML;Dickson AJ;Vance D

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古新世始新世热最大值(PETM)代表了一个主要的碳循环和气候扰动,与海洋脱氧有关,在质量上类似于更广泛的中生代海洋缺氧事件。尽管海洋脱氧的指标在古新世极热峰中很常见,并且与生物更替有关,但脱氧的全球范围和时间进展受到很大限制。在这里,我们提出了碳酸盐相关的铀同位素数据的PETM。缺乏可解决的扰动,以U-循环在事件表明有限的扩展海底缺氧在全球范围内。我们使用这一结果,结合地球化学模型,设定一个上限的全球海底脱氧的程度。该模型表明,新的铀同位素数据,同时也与合理的碳排放情景和碳循环恢复的观测结果一致,允许缺氧最多扩大10倍,覆盖<2%的海底面积。古新世始新世热盛期海洋缺氧的扩大对动物群的更替模式和全球海洋地球化学循环具有重要意义。在这里,作者使用铀同位素和地球化学模型表明,缺氧的面积扩张必须限制在10倍。
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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发表时间: 2016-01-20
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