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

Polar research

Ceri N. Lewis¹  Laura A. Edwards²  Glenn A. Cooper³  Lisa A. Miller⁴  Robert Clement⁴  Helen S. Findlay⁵  Nick Hardman-Mountford⁶  Svein Vagle⁷ 

[1] GeographySchool of Environment, Education and Development, University of Manchester, Oxford Road, Manchester M13 9PL, UK;Centre for Applied Marine Sciences, Menai Science Laboratories, Bangor University, Menai Bridge, Anglesey LL59 5AB, UK;College of Life and Environmental SciencesUniversity of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter EX4 4PS, UK;Institute of Ocean SciencesFisheries and Oceans Canada, Sidney, British Columbia V8L 4B2, Canada;Plymouth Marine LaboratoryProspect Place, West Hoe, Plymouth PL1 3DH, UKCorrespondence;School of GeoscienceUniversity of Edinburgh, 202 Crew Building, Edinburgh EH9 3JN, Scotland, UK;The Commonwealth Scientific and Industrial Research OrganisationMarine and Atmospheric Research, Underwood Avenue, Floreat WA 6014, Australia

关键词: Sea ice;    carbon cycling;    biogeochemical cycles;    nutrients;    Arctic Ocean;    ocean acidification;   

DOI  :  10.3402/polar.v34.24170

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

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 Arch...

【 授权许可】

CC BY-NC