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On the potential contribution of open lead particle emissions to the central Arctic aerosol concentration
Univ Bayreuth, Bayreuth Ctr Ecol & Environm Res, D-95440 Bayreuth, Germany.;Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden..
Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England..
Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden.;Stockholm Univ, Bert Bolin Ctr Climate Res, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden.;Stockholm Univ, Bert Bolin Ctr Climate Res, S-10691 Stockholm, Sweden..
Ansvarlig organisasjon
2011 (engelsk)Inngår i: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 11, nr 7, 3093-3105 s.Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present direct eddy covariance measurements of aerosol number fluxes, dominated by sub-50 nm particles, at the edge of an ice floe drifting in the central Arctic Ocean. The measurements were made during the ice-breaker borne ASCOS (Arctic Summer Cloud Ocean Study) expedition in August 2008 between 2 degrees-10 degrees W longitude and 87 degrees-87.5 degrees N latitude. The median aerosol transfer velocities over different surface types (open water leads, ice ridges, snow and ice surfaces) ranged from 0.27 to 0.68 mm s(-1) during deposition-dominated episodes. Emission periods were observed more frequently over the open lead, while the snow behaved primarily as a deposition surface. Directly measured aerosol fluxes were compared with particle deposition parameterizations in order to estimate the emission flux from the observed net aerosol flux. Finally, the contribution of the open lead particle source to atmospheric variations in particle number concentration was evaluated and compared with the observed temporal evolution of particle number. The direct emission of aerosol particles from the open lead can explain only 5-10% of the observed particle number variation in the mixing layer close to the surface.

sted, utgiver, år, opplag, sider
2011. Vol. 11, nr 7, 3093-3105 s.
HSV kategori
Forskningsprogram
SWEDARCTIC 2008, ASCOS
Identifikatorer
URN: urn:nbn:se:polar:diva-2331DOI: 10.5194/acp-11-3093-2011ISI: 000289548200005OAI: oai:DiVA.org:polar-2331DiVA: diva2:858470
Tilgjengelig fra: 2015-10-02 Laget: 2015-10-02 Sist oppdatert: 2016-11-21

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