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Acidification of East Siberian Arctic Shelf waters through addition of freshwater and terrestrial carbon

Artikel i vetenskaplig tidskrift
Författare Igor Semiletov
Irina Pipko
Örjan Gustafsson
Leif G Anderson
Valentin Sergienko
Svetlana Pugach
Oleg Dudarev
Alexander Charkin
Alexander Gukov
Lisa Bröder
August Andersson
Eduard Spivak
Natalia Shakhova
Publicerad i Nature Geoscience
Volym 9
Sidor 361-365
ISSN 1752-0894
Publiceringsår 2016
Publicerad vid Institutionen för marina vetenskaper
Sidor 361-365
Språk en
Länkar dx.doi.org/10.1038/ngeo2695
Ämnesord ocean acidification, Arctic Ocean
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Ocean acidification affects marine ecosystems and carbon cycling, and is considered a direct effect of anthropogenic carbon dioxide uptake from the atmosphere. Accumulation of atmospheric CO2 in ocean surface waters is predicted to make the ocean twice as acidic by the end of this century. The Arctic Ocean is particularly sensitive to ocean acidification because more CO2 can dissolve in cold water. Here we present observations of the chemical and physical characteristics of East Siberian Arctic Shelf waters from 1999, 2000–2005, 2008 and 2011, and find extreme aragonite undersaturation that reflects acidity levels in excess of those projected in this region for 2100. Dissolved inorganic carbon isotopic data and Markov chain Monte Carlo simulations of water sources using salinity and delO-18 data suggest that the persistent acidification is driven by the degradation of terrestrial organic matter and discharge of Arctic river water with elevated CO2 concentrations, rather than by uptake of atmospheric CO2. We suggest that East Siberian Arctic Shelf waters may become more acidic if thawing permafrost leads to enhanced terrestrial organic carbon inputs and if freshwater additions continue to increase, which may affect their efficiency as a source of CO2.

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