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Hypoxia in autumn of the East China Sea

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Abstract

Hypoxia (O2 ≤ 2 mg L−1) can severely threaten the survival of marine life and alter the biogeochemical cycles of coastal ecosystems. Its impacts are dependent on its duration. In the present study, hypoxia was observed in autumn at the end of October 2011. It may be one of the latest recorded annual hypoxic events in the East China Sea (ECS). In the hypoxic regions, a large amount of nutrients and dissolved inorganic carbon were observed to regenerate. Also, acidification (low pH) was observed. On the other hand, hypoxic dissipation may be due to the destratification caused by the upwelling of the hypoxic regions in the ECS. These results suggest that hypoxia may occur for longer periods of time than expected and, accordingly, the effects of hypoxia on the ECS ecosystems should be reconsidered and further evaluated.

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Chen, C. C., Gong, G. C., Chou, W. C., & Shiah, F. K. (2020). Hypoxia in autumn of the East China Sea. Marine Pollution Bulletin, 152. https://doi.org/10.1016/j.marpolbul.2019.110875

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