English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/162241
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Meridional overturning circulation conveys fast acidification to the deep Atlantic Ocean

AuthorsPérez, Fiz F. ; Fontela, Marcos; García-Ibáñez, Maribel I. ; Mercier, Herlé; Velo, A. ; Lherminier, Pascale; Zunino, P.; Paz, M. de la ; Alonso Pérez, Fernando ; Fernández-Guallart, E. ; Padín, X. A.
Issue Date2018
PublisherNature Publishing Group
CitationNature 554: 515-518 (2018)
AbstractSince the Industrial Revolution, the North Atlantic Ocean has been accumulating anthropogenic carbon dioxide (CO2) and experiencing ocean acidification1, that is, an increase in the concentration of hydrogen ions (a reduction in pH) and a reduction in the concentration of carbonate ions. The latter causes the ‘aragonite saturation horizon’—below which waters are undersaturated with respect to a particular calcium carbonate, aragonite—to move to shallower depths (to shoal), exposing corals to corrosive waters2,3. Here we use a database analysis to show that the present rate of supply of acidified waters to the deep Atlantic could cause the aragonite saturation horizon to shoal by 1,000–1,700 metres in the subpolar North Atlantic within the next three decades. We find that, during 1991–2016, a decrease in the concentration of carbonate ions in the Irminger Sea caused the aragonite saturation horizon to shoal by about 10–15 metres per year, and the volume of aragonite-saturated waters to reduce concomitantly. Our determination of the transport of the excess of carbonate over aragonite saturation (xc[CO32−])—an indicator of the availability of aragonite to organisms—by the Atlantic meridional overturning circulation shows that the present-day transport of carbonate ions towards the deep ocean is about 44 per cent lower than it was in preindustrial times. We infer that a doubling of atmospheric anthropogenic CO2 levels—which could occur within three decades according to a ‘business-as-usual scenario’ for climate change4—could reduce the transport of xc[CO32−] by 64–79 per cent of that in preindustrial times, which could severely endanger cold-water coral habitats. The Atlantic meridional overturning circulation would also export this acidified deep water southwards, spreading corrosive waters to the world ocean
Description15 pages, 3 tables, 9 figures
Publisher version (URL)http://dx.doi.org/10.1038/nature25493
URIhttp://hdl.handle.net/10261/162241
DOI10.1038/nature25493
ISSN0028-0836
E-ISSN1476-4687
Appears in Collections:(IIM) Artículos
Files in This Item:
File Description SizeFormat 
Meridional_overturning_2018.pdf1,21 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.