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dc.contributor.authorEricson, Ylva
dc.contributor.authorUlfsbo, Adam
dc.contributor.authorvan Heuven, Steven
dc.contributor.authorKattner, Gerhard
dc.contributor.authorAnderson, Leif G.
dc.description.abstractConcentrations of dissolved inorganic carbon (DIC), total alkalinity (TA), nutrients, and oxygen in subsurface waters of the central Arctic Ocean have been investigated for conceivable time trends over the last two decades. Data from six cruises (1991–2011) that cover the Nansen, Amundsen, and Makarov Basins were included in this analysis. In waters deeper than 2000 m, no statistically significant trend could be observed for DIC, TA, phosphate, or nitrate, but a small rate of increase in apparent oxygen utilization (AOU) was noticeable. For the individual stations, differences in concentration of each property were computed between the mean concentrations in the Arctic Atlantic Water (AAW) or the upper Polar Deep Water (uPDW), i.e., between about 150 and 1400 m depth, and in the deep water (assumed invariable over time). In these shallower water layers, we observe significant above-zero time trends for DIC, in the range of 0.6–0.9 μmol kg-1 yr-1 (for AAW) and 0.4–0.6 μmol kg-1 yr-1 (for uPDW). No time trend in nutrients could be observed, indicating no change in the rate of organic matter mineralization within this depth range. Consequently, the buildup of DIC is attributed to increasing concentrations of anthropogenic carbon in the waters flowing into these depth layers of the Arctic Ocean. The resulting rate of increase of the column inventory of anthropogenic CO2 is estimated to be between 0.6 and 0.9 mol C m-2 yr-1, with distinct differences between basins.en_US
dc.relation.ispartof<a href="" target="blank"> Drivers of the marine CO2 system in the High Arctic - from the deep basins to the shallow fjords</a>en_US
dc.titleIncreasing carbon inventory of the intermediate layers of the Arctic Oceanen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2014 The Authorsen_US
dc.source.journalJournal of Geophysical Research: Oceans

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