Articles | Volume 21, issue 7
https://doi.org/10.5194/bg-21-1961-2024
https://doi.org/10.5194/bg-21-1961-2024
Research article
 | 
17 Apr 2024
Research article |  | 17 Apr 2024

Vertical mixing alleviates autumnal oxygen deficiency in the central North Sea

Charlotte A. J. Williams, Tom Hull, Jan Kaiser, Claire Mahaffey, Naomi Greenwood, Matthew Toberman, and Matthew R. Palmer

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Short summary
Oxygen (O2) is a key indicator of ocean health. The risk of O2 loss in the productive coastal/continental slope regions is increasing. Autonomous underwater vehicles equipped with O2 optodes provide lots of data but have problems resolving strong vertical O2 changes. Here we show how to overcome this and calculate how much O2 is supplied to the low-O2 bottom waters via mixing. Bursts in mixing supply nearly all of the O2 to bottom waters in autumn, stopping them reaching ecologically low levels.
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