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Direct determination of the air-sea CO2 gas transfer velocity in Arctic sea ice regions
Stockholm University, Faculty of Science, Department of Meteorology . University of Leeds, UK.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0002-5640-6419
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Number of Authors: 9
2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 8, 3770-3778 p.Article in journal (Refereed) Published
Abstract [en]

The Arctic Ocean is an important sink for atmospheric CO2. The impact of decreasing sea ice extent and expanding marginal ice zones on Arctic air-sea CO2 exchange depends on the rate of gas transfer in the presence of sea ice. Sea ice acts to limit air-sea gas exchange by reducing contact between air and water but is also hypothesized to enhance gas transfer rates across surrounding open-water surfaces through physical processes such as increased surface-ocean turbulence from ice-water shear and ice-edge form drag. Here we present the first direct determination of the CO2 air-sea gas transfer velocity in a wide range of Arctic sea ice conditions. We show that the gas transfer velocity increases near linearly with decreasing sea ice concentration. We also show that previous modeling approaches overestimate gas transfer rates in sea ice regions.

Place, publisher, year, edition, pages
2017. Vol. 44, no 8, 3770-3778 p.
Keyword [en]
CO2, carbon dioxide, Arctic ocean, eddy covariance, Arctic, icebreaker
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-144720DOI: 10.1002/2017GL073593ISI: 000401847500039OAI: oai:DiVA.org:su-144720DiVA: diva2:1127963
Available from: 2017-07-20 Created: 2017-07-20 Last updated: 2017-11-30Bibliographically approved

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Prytherch, JohnCrill, Patrick M.Thornton, Brett F.Tjernström, MichaelGeibel, Marc C.Humborg, Christoph
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Department of Meteorology Department of Geological SciencesStockholm University Baltic Sea CentreDepartment of Environmental Science and Analytical Chemistry
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