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

Findlay, HS; Edwards, LA; Lewis, CN; Cooper, GA; Clement, R; Harman-Mountford, N; Vagle, S; Miller, LA. 2015 Late winter biogeochemical dynamics under sea ice in the Canadian High Arctic. Polar Research, 34 (24170). https://doi.org/10.3402/polar.v34.24170

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Abstract/Summary

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.

Item Type: Publication - Article
Additional Keywords: Sea ice, Ocean acidification, climate change, High Arctic, Carbonate chemistry, phytoplankton, nutrients
Subjects: Marine Sciences
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Helen Findlay
Date made live: 26 Apr 2018 14:28
Last Modified: 12 Nov 2018 12:48
URI: http://plymsea.ac.uk/id/eprint/7663

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