Article (Scientific journals)
A new intermittent regime of convective ventilation threatens the Black Sea oxygenation status
Capet, Arthur; Vandenbulcke, Luc; Grégoire, Marilaure
2020In Biogeosciences, 17, p. 6507–6525
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Keywords :
Black Sea; Ventilation; Deoxygenation; Dense water formation
Abstract :
[en] 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 the mid-1970s to the early 1990s and, second, a reduction in the ventilation processes, suspected for recent years (post-2005). Here, we show that the Black Sea convective ventilation regime has been drastically altered by atmospheric warming during the last decade. Since 2009, the prevailing regime has been below the range of variability recorded since 1955 and has been characterized by consecutive years during which the usual partial renewal of intermediate water has not occurred. Oxygen records from the last decade are used to detail the relationship between cold-water formation events and oxygenation at different density levels, to highlight the role of convective ventilation in the oxygen budget of the intermediate layers and to emphasize the impact that a persistence in the reduced ventilation regime would bear on the oxygenation structure of the Black Sea and on its biogeochemical balance.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Capet, Arthur  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > MAST (Modeling for Aquatic Systems)
Vandenbulcke, Luc ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > MAST (Modeling for Aquatic Systems)
Grégoire, Marilaure  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > MAST (Modeling for Aquatic Systems)
Language :
English
Title :
A new intermittent regime of convective ventilation threatens the Black Sea oxygenation status
Publication date :
December 2020
Journal title :
Biogeosciences
ISSN :
1726-4170
eISSN :
1726-4189
Publisher :
European Geosciences Union (EGU), Germany
Volume :
17
Pages :
6507–6525
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 15 February 2021

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