Articles | Volume 17, issue 24
Biogeosciences, 17, 6507–6525, 2020
https://doi.org/10.5194/bg-17-6507-2020

Special issue: Ocean deoxygenation: drivers and consequences – past, present...

Biogeosciences, 17, 6507–6525, 2020
https://doi.org/10.5194/bg-17-6507-2020

Research article 23 Dec 2020

Research article | 23 Dec 2020

A new intermittent regime of convective ventilation threatens the Black Sea oxygenation status

Arthur Capet et al.

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Short summary
The Black Sea is 2000 m deep, but, due to limited ventilation, only about the upper 100 m contains enough oxygen to support marine life such as fish. This oxygenation depth has been shown to be decreasing (1955–2019). Here, we evidence that atmospheric warming induced a clear shift in an important ventilation mechanism. We highlight the impact of this shift on oxygenation. There are important implications for marine life and carbon and nutrient cycling if this new ventilation regime persists.
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