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Elevated biogenic sulphur dioxide concentrations over the North Atlantic
Authors:Alison Michelle Seguin  Ann-Lise Norman  Sarah Eaton  Morie Wadleigh  Sangeeta Sharma
Institution:1. University of Calgary, Canada;2. Memorial University of Newfoundland, Canada;3. Environment Canada, Atmospheric Science and Technology Directorate, Canada;1. Department of Geography, Queen’s University, Mackintosh-Corry Hall, Room D201, Kingston, ON K7L 3N6, Canada;2. Department of Physics and Astronomy, 834 Campus Place N.W, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada;3. BSc Environmental Science Program, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada;1. Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA;2. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA;3. School of Earth Sciences and Resources, China University of Geosciences, Beijing, China;1. Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 S. College Road, Wilmington, NC 28403, United States;2. Department of Geology & Planetary Science, 4107 O''Hara Street, University of Pittsburgh, Pittsburgh, PA 15260, United States;3. Department of Chemistry and Biochemistry, College of Charleston, Charleston, SC 29424, United States
Abstract:Elevated biogenic SO2 from the oxidation of dimethylsulphide (DMS) in the marine atmosphere was measured over the North Atlantic Ocean in spring and summer 2003. Stable isotope apportionment was used to distinguish between anthropogenic and biogenic SO2 in the marine atmosphere south of Greenland. Atmospheric DMS measurements were within range of previous studies. Biogenic SO2 concentrations were as high as 82 nmol m?3 (spring geometric mean: 4 nmol m?3, σ = 17; summer geometric mean 7 nmol m?3, σ = 19) and are the highest reported values for marine biogenic SO2 in the literature. Elevated biogenic SO2 was found in air masses influenced by anthropogenic pollutants during the summer. This indicates that anthropogenic pollutants may affect the fate of oceanic emissions of sulphur compounds in the atmosphere favoring the formation of cloud condensation nuclei.
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