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- Title
Climate change induced a new intermittent regime of convective ventilation that threatens the Black Sea oxygenation status.
- Authors
Capet, Arthur; Vandenbulcke, Luc; Grégoire, Marilaure
- Abstract
The Black Sea is entirely anoxic, except for a thin (-100 m) ventilated surface layer. Since 1955, the oxygen content of this upper layer has decreased by 44 %. The reasons hypothesized for this decrease are, first, a period of eutrophication from mid 70's to early 90's and, second, a reduction in the ventilation processes, suspected for the recent years. Here we show that the Black Sea convective ventilation regime has been drastically altered by atmospheric warming during the last decade. Since 2008, the prevailing regime is below the range of variability recorded since 1955, and is characterized by consecutive years during which the renewal of intermediate waters does not occur. Oxygen records from the last decade indicate a clear relationship between cold water formation events and oxygenation status at different pycnal levels, suggesting a leading role of convective ventilation in the oxygen budget of the upper intermediate layers. We thus suggest that this regime shift has a significant impact on the oxygenation structure of the Black Sea and on its biogeochemical balance.
- Subjects
VENTILATION; CLIMATE change; IMPACT craters; SEAS; MINE ventilation
- Publication
Biogeosciences Discussions, 2020, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2020-76