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Uptake of CO2 by the Arctic Ocean in a changing climate
Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden..
Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden..
Responsible organisation
2010 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 122, no 1-4, 96-104 p.Article in journal (Refereed) Published
Abstract [en]

Carbon system data from five expeditions over the time period of 1991 to 2005 in the central Arctic Ocean are evaluated with respect to the partial pressure of carbon dioxide in the surface waters. Nearly all waters were undersaturated with values typically below 300 mu atm. In the areas occupied during several expeditions the variability is substantial, making it unrealistic to produce a coherent pCO(2) map. The potential oceanic uptake of CO2 in the Arctic Ocean is evaluated as the difference in calculated total dissolved inorganic carbon at equilibrium with the atmosphere and that measured. The uptake capacity as computed from the undersaturation of the surface waters, although not homogenous across the separate basins, is on average 13 +/- 3 g C m(-2) within the surface mixed layer of the central Arctic Ocean. The uptake capacity is dependent on several variables and processes, many likely to change as the Arctic environment responds to different climate forcings. For instance, the projected decrease in summer sea ice cover allows for air sea equilibrium resulting in an estimated potential increase in CO2 uptake of 1.3 +/- 0.3 Tg C year(-1). Other factors influencing the uptake capacity of the surface mixed layer that are discussed in this contribution are changes in the depth of the surface mixed layer, temperature and primary production, all impacting the partial pressure of CO2. (C) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 122, no 1-4, 96-104 p.
National Category
Natural Sciences
Research subject
SWEDARCTIC 1991, Arctic Ocean 1991; SWEDARCTIC 2005, Beringia 2005
Identifiers
URN: urn:nbn:se:polar:diva-2272DOI: 10.1016/j.marchem.2010.07.002ISI: 000285369200011OAI: oai:DiVA.org:polar-2272DiVA: diva2:857779
Available from: 2015-09-30 Created: 2015-09-30 Last updated: 2016-11-21

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