海洋中的化学失衡也会导致灭绝事件。 当海洋的中层或上层变得缺氧时,就会发生死亡的连锁反应。 奥陶纪-lur柳纪,泥盆纪晚期,二叠纪-三叠纪和三叠纪-侏罗纪的灭绝都包括缺氧事件。 有时必需的微量元素(例如硒)的含量下降,导致生物大灭绝。 有时,散热孔中的硫酸盐还原细菌会失控,释放出过量的硫化氢,从而削弱臭氧层,使生命暴露于致命的紫外线下。 海洋还经历了周期性的倾覆,高盐度的地表水沉入了深处。 缺氧的深水上升,杀死表面生物。 晚泥盆世和二叠纪-三叠纪的灭绝是与海洋倾覆有关的。

新加坡国立大学环境工程Essay代写:微量元素

Chemical imbalances in the ocean can also lead to extinction events. When the middle or upper layer of the ocean becomes hypoxic, a chain reaction of death occurs. The Ordovician-lur Liuji, late Devonian, Permian-Triassic and Triassic-Jurassic extinctions all included anoxic events. Sometimes the amount of essential trace elements (such as selenium) is reduced, leading to the extinction of the organism. Sometimes, the sulfate-reducing bacteria in the vents are out of control, releasing excess hydrogen sulfide, which weakens the ozone layer and exposes life to deadly ultraviolet light. The ocean also experienced periodic overturning, and high-salinity surface water sank into the depths. Anoxic deep water rises and kills surface organisms. The extinction of the Late Devonian and Permian-Triassic was related to ocean overturning.

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