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Bottom Water Acidification and Warming on the Western Eurasian Arctic Shelves: Dynamical Downscaling Projections

Bottom Water Acidification and Warming on the Western Eurasian Arctic Shelves: Dynamical Downscaling Projections

Category
Journal publication
Abstract
The impacts of oceanic CO2 uptake and global warming on the surface ocean environment have received substantial attention, but few studies have focused on shelf bottom water, despite its importance as habitat for benthic organisms and demersal fisheries such as cod. We used a downscaling Ocean biogeochemical model to project bottom water acidification and warming on the western Eurasian Arctic shelves. A model hindcast produced 14–18 year acidification trends that were largely consistent with observational estimates at stations in the Iceland and Irminger Seas. Projections under SRES A1B scenario revealed a rapid and spatially variable decline in bottom pH by 0.10–0.20 units over 50 years (2.5%–97.5% quantiles) at depths 50–500 m on the Norwegian, Barents, Kara, and East Greenland shelves. Bottom water undersaturation with respect to aragonite occurred over the entire Kara shelf by 2040 and over most of the Barents and East Greenland shelves by 2070. Shelf acidification was predominantly driven by the accumulation of anthropogenic CO2, and was concurrent with warming of 0.1–2.78C over 50 years. These combined perturbations will act as significant multistressors on the Barents and Kara shelves. Future studies should aim to improve the resolution of shelf bottom processes in models, and should consider the Kara Sea and Russian shelves as possible bellwethers of shelf acidification.
Client
  • EC/FP7 / 212085
  • EC/FP7 / 26493
  • Norges forskningsråd / 225956
  • Norges forskningsråd / 184860
  • Notur/NorStore / NN9412K
Language
English
Author(s)
  • Wallhead Philip
  • Bellerby Richard
  • Silyakova Anna
  • Slagstad Dag
  • Polukhin Alexander A.
Affiliation
  • Norwegian Institute of Water Research
  • East China Normal University Shanghai
  • UiT The Arctic University of Norway
  • UiT The Arctic University of Norway
  • SINTEF Ocean / Miljø og nye ressurser
  • P.P. Shirshov Instiute of Oceanology
Year
2017
Published in
Journal of Geophysical Research (JGR): Oceans
ISSN
2169-9275
Volume
122
Issue
10
Page(s)
8126 - 8144