Late winter biogeochemical conditions under sea ice in the Canadian High Arctic

  • Helen S. Findlay Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth, PL1 3DH
  • Laura A. Edwards Geography Department, School of Environment and Development, University of Manchester
  • Ceri N. Lewis College of Life and Environmental Sciences, University of Exeter
  • Glenn A. Cooper Centre for Ocean Climate Chemistry, Institute of Ocean Sciences, Fisheries and Oceans Canada
  • Robert Clement University of Edinburgh
  • Nick Hardman-Mountford CSIRO Marine and Atmospheric Research
  • Svein Vagle Institute of Ocean Sciences, Fisheries and Oceans Canada
  • Lisa A. Miller Institute of Ocean Sciences, Fisheries and Oceans Canada
Keywords: Sea ice, carbon cycling, biogeochemical cycles, nutrients, Arctic Ocean, ocean acidification

Abstract

With the Arctic summer sea-ice extent in decline, questions are arising as to how changes in sea-ice dynamics might affect biogeochemical cycling and phenomena such as carbon dioxide (CO2) uptake and ocean acidification. Recent field research in these areas has concentrated on biogeochemical and CO2 measurements during spring, summer or autumn, but there are few data for the winter or winter–spring transition, particularly in the High Arctic. Here, we present carbon and nutrient data within and under sea ice measured during the Catlin Arctic Survey, over 40 days in March and April 2010, off Ellef Ringnes Island (78° 43.11′ N, 104° 47.44′ W) in the Canadian High Arctic. Results show relatively low surface water (1–10 m) nitrate (<1.3 µM) and total inorganic carbon concentrations (mean±SD=2015±5.83 µmol kg−1), total alkalinity (mean±SD=2134±11.09 µmol kg−1) and under-ice pCO2sw (mean±SD=286±17 µatm). These surprisingly low wintertime carbon and nutrient conditions suggest that the outer Canadian Arctic Archipelago region is nitrate-limited on account of sluggish mixing among the multi-year ice regions of the High Arctic, which could temper the potential of widespread under-ice and open-water phytoplankton blooms later in the season.

Keywords: Sea ice; carbon cycling; biogeochemical cycles; nutrients; Arctic Ocean; ocean acidification.

(Published: 9 December 2015)

Citation: Polar Research 2015, 34, 24170, http://dx.doi.org/10.3402/polar.v34.24170

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Published
2015-12-09
How to Cite
Findlay, H. S., Edwards, L. A., Lewis, C. N., Cooper, G. A., Clement, R., Hardman-Mountford, N., Vagle, S., & Miller, L. A. (2015). Late winter biogeochemical conditions under sea ice in the Canadian High Arctic. Polar Research, 34. https://doi.org/10.3402/polar.v%v.24170
Section
Thematic Cluster: The Arctic in Rapid Transition - Marine Ecosystems