
The initial rise of atmospheric oxygen was a complex, oscillatory process, with multiple returns to an anoxic state until around 2.2 billion years ago. Marine oxygenation dynamics were closely coupled with this atmospheric trend.


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The Great Oxidation Event represents a tipping point in Earth’s O2 mass balance—when more O2 was being produced than destroyed—that forever changed the habitability of worldwide oceans.

Onset of coupled atmosphere–ocean oxygenation 2.3 billion years ago - Nature

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Coupled Atmosphere-Ocean Oxygenation Began 2.3 Billion Years Ago
