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Wintertime Arctic Ocean sea water properties and primary marine aerosol concentrations
Stockholm Univ, Dept Appl Environm Sci, S-11418 Stockholm, Sweden..
Stockholm Univ, Dept Appl Environm Sci, S-11418 Stockholm, Sweden.;Univ Helsinki, Dept Phys, Helsinki 00014, Finland..
Stockholm Univ, Dept Meteorol, S-11418 Stockholm, Sweden.;Stockholm Univ, Bert Bolin Ctr Climate Res, S-11418 Stockholm, Sweden..
Stockholm Univ, Dept Appl Environm Sci, S-11418 Stockholm, Sweden.;Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden..
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2012 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 12, no 21, 10405-10421 p.Article in journal (Refereed) Published
Abstract [en]

Sea spray aerosols are an important part of the climate system through their direct and indirect effects. Due to the diminishing sea ice, the Arctic Ocean is one of the most rapidly changing sea spray aerosol source areas. However, the influence of these changes on primary particle production is not known. In laboratory experiments we examined the influence of Arctic Ocean water temperature, salinity, and oxygen saturation on primary particle concentration characteristics. Sea water temperature was identified as the most important of these parameters. A strong decrease in sea spray aerosol production with increasing water temperature was observed for water temperatures between -1 degrees C and 9 degrees C. Aerosol number concentrations decreased from at least 1400 cm(-3) to 350 cm-3. In general, the aerosol number size distribution exhibited a robust shape with one mode close to dry diameter D-p 0.2 mu m with approximately 45% of particles at smaller sizes. Changes in sea water temperature did not result in pronounced change of the shape of the aerosol size distribution, only in the magnitude of the concentrations. Our experiments indicate that changes in aerosol emissions are most likely linked to changes of the physical properties of sea water at low temperatures. The observed strong dependence of sea spray aerosol concentrations on sea water temperature, with a large fraction of the emitted particles in the typical cloud condensation nuclei size range, provide strong arguments for a more careful consideration of this effect in climate models.

Place, publisher, year, edition, pages
2012. Vol. 12, no 21, 10405-10421 p.
Research subject
SWEDARCTIC 2006, Zeppelin; SWEDARCTIC 2007, Zeppelin 2007
Identifiers
URN: urn:nbn:se:polar:diva-2297DOI: 10.5194/acp-12-10405-2012ISI: 000310954400025OAI: oai:DiVA.org:polar-2297DiVA: diva2:858251
Available from: 2015-10-01 Created: 2015-10-01 Last updated: 2015-10-01

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