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Causes of increased dissolved inorganic carbon in the subsurface layers in the western shelfbreak and high latitudes basin in the Arctic Pacific sector
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Number of Authors: 5
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2021 (English)In: Environmental Research Letters, E-ISSN 1748-9326, Vol. 16, no 10Article in journal (Refereed) Published
Abstract [en]

The expansion of dissolved inorganic carbon (DIC)-rich water carried by the Pacific inflow creates a DIC maximum layer and exerts important influences on ocean acidification in the subsurface Arctic Ocean. This study analyzed shifts in the DIC distribution of the subsurface Arctic Ocean during 1998–2015 through hindcast simulation using a three-dimensional ocean-sea ice-biogeochemical model. For this purpose, the study was divided into two time periods (1998–2007 and 2008–2015). The results showed that the lower boundary layer of the Pacific Winter Water, defined as an isopycnal of 27 kg m−3, became deeper by ∼50 m in the central Canada Basin and expanded northward during 2008–2015 relative to 1998–2007. Accordingly, the subsurface DIC maximum layer deepened and expanded northwards into the Makarov Basin at high latitudes around 85° N. During 2008–2015, DIC concentrations, averaged over a 50–250 m water column, increased significantly in the Chukchi-East Siberian Shelfbreak and Makarov Basin. The DIC increase over the shelfbreak is mainly attributable to increased local biological degradation and the transportation of DIC-rich water from the Chukchi Shelf through Barrow Canyon. Estimates of the DIC budget indicated that advection controlled the increase in DIC content in the Makarov Basin during 2008–2015. This is attributed to the shift of the ocean circulation pattern, in which the ocean current along the Chukchi-East Siberian Slope to the Makarov Basin became stronger during 2008–2015, promoting the transport of DIC-rich Pacific Water into the Makarov Basin.

Place, publisher, year, edition, pages
IOP Publishing , 2021. Vol. 16, no 10
National Category
Earth and Related Environmental Sciences
Research subject
SWEDARCTIC 2002, Arctic Ocean 2002; SWEDARCTIC 2005, Beringia 2005; SWEDARCTIC 2007, LOMROG; SWEDARCTIC 2014, SWERUS-C3
Identifiers
URN: urn:nbn:se:polar:diva-8874DOI: 10.1088/1748-9326/ac2408OAI: oai:DiVA.org:polar-8874DiVA, id: diva2:1629781
Available from: 2022-01-18 Created: 2022-01-18 Last updated: 2024-01-17Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1088/1748-9326/ac2408
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Citation style
  • apa
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