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Hygroscopic growth and cloud forming potential of Arctic aerosol based on observed chemical and physical characteristics (a 1 year study 2007-2008)
Lund Univ, Lund, Sweden.;Stockholm Univ, S-10691 Stockholm, Sweden..
Stockholm Univ, S-10691 Stockholm, Sweden..
Stockholm Univ, S-10691 Stockholm, Sweden..
Univ Appl Sci Northwestern Switzerland, Brugg, Switzerland..
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2014 (engelsk)Inngår i: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 119, nr 24, s. 14080-14097Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Aerosol particle samples were collected, and the particle size distribution was measured during 1 year at the Zeppelin station (474 m asl) on Svalbard. The chemical constituents, hygroscopicity, and cloud forming properties of the aerosol were analyzed. The aerosol contained mostly sulfate and nitrate during the summer, whereas from September to February the main components were sodium and chloride. The highest concentration (20%) of water-soluble organic matter was sampled in December. The hygroscopic growth factors for the water-soluble fraction were 1.56-2.01 at 90% relative humidity, peaking in October, when the measured supersaturations needed for cloud drop formation were also the lowest. Sea-salt components showed a positive correlation with the cloud forming capability, whereas the organic content had no correlation. The hygroscopicity factors, or kappa values, were determined in three ways for each month: (1)kappa(H-TDMA) from measurements of the hygroscopic growth of particles produced from atomization of the filter extracts, (2)kappa(CCNC) from measurements of the critical supersaturation as a function of size for these particles, and (3)kappa(chem) was modeled based on the organic and inorganic composition of the filter samples. Using the measured particle size distributions and the critical activation diameters from the Cloud Condensation Nuclei Counter (CCNC) measurements, it was found that the number of CCN varied more with supersaturation during the summer months. The best agreement between all three kappa values was in December and January. Comparisons with earlier studies do not suggest any trend in the Arctic aerosol seasonal variability over the last decade.

sted, utgiver, år, opplag, sider
2014. Vol. 119, nr 24, s. 14080-14097
Forskningsprogram
SWEDARCTIC 2006, Zeppelin; SWEDARCTIC 2007, Zeppelin 2007
Identifikatorer
URN: urn:nbn:se:polar:diva-2287DOI: 10.1002/2014JD021657ISI: 000348460000026OAI: oai:DiVA.org:polar-2287DiVA, id: diva2:858154
Tilgjengelig fra: 2015-10-01 Laget: 2015-10-01 Sist oppdatert: 2017-12-01

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