A Double‐Edged Sword: The Role of Sulfate in Anoxic Marine Phosphorus Cycling Through Earth History
A Double‐Edged Sword: The Role of Sulfate in Anoxic Marine Phosphorus Cycling Through Earth History
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双刃剑：硫酸盐在地球历史缺氧海洋磷循环中的作用
DOI：
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发表时间：
2022
影响因子：
5.2
通讯作者：
M. Kipp
中科院分区：
文献类型：
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作者：
M. Kipp
现代缺氧海洋沉积物释放磷（P）到海水中，在多个时间尺度上驱动反馈。在低于百万年的时间尺度上，缺氧P再生放大了海洋脱氧;在多百万年的时间尺度上，它稳定了大气O2。一些作者将这一思路延伸到前寒武纪：通过类比，广泛的海洋缺氧意味着沉积物中广泛的磷再生。然而，这忽略了硫酸盐在磷再生中的作用。虽然硫酸盐在今天的海水中很丰富，但在前寒武纪却很稀少。在这里，一个简单的模型是用来隔离硫酸盐在缺氧磷循环的作用。该模型再现了高硫酸盐世界中缺氧P再生驱动的已知反馈，但在低硫酸盐缺氧沉积物中显示出无声的P再生。因此，“有限”和“增强”P再生之间的过渡是由硫酸盐控制的。因此，硫酸盐是缺氧磷循环的双刃剑：它可以根据环境背景放大氧化或脱氧。
Modern anoxic marine sediments release phosphorus (P) to seawater, driving feedbacks at multiple timescales. On sub‐Myr timescales, anoxic P regeneration amplifies ocean deoxygenation; on multi‐Myr timescales, it stabilizes atmospheric O2. Some authors have extended this thinking to the Precambrian: by analogy, widespread ocean anoxia would imply extensive P regeneration from sediments. However, this neglects the role of sulfate in P regeneration. While abundant in seawater today, sulfate was scarce in the Precambrian. Here a simple model is used to isolate the role of sulfate in anoxic P cycling. The model reproduces known feedbacks driven by anoxic P regeneration in a high‐sulfate world, but shows muted P regeneration in low‐sulfate, anoxic sediments. The transition between “limited” and “enhanced” P regeneration is thus controlled by sulfate. As a result, sulfate is a double‐edged sword wielded by the anoxic P cycle: it can amplify oxygenation or deoxygenation depending on environmental context.
影响因子：
3.9
作者：
C. März;S. Poulton;T. Wagner;B. Schnetger;H. Brumsack
通讯作者：
C. März;S. Poulton;T. Wagner;B. Schnetger;H. Brumsack
DOI：
10.1073/pnas.1916738117
发表时间：
2020-06-02
影响因子：
11.1
作者：
Laakso, Thomas A.;Sperling, Erik A.;Knoll, Andrew H.
通讯作者：
Knoll, Andrew H.