Hygroscopic properties of ultrafine particles in coastal and forest environments

Ha¨meri, K.; Va¨keva¨, M.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p777
Academic Journal
The hygroscopic properties of recently produced ultrafine particles were measured in forestal and coastal environments using an Ultrafine Tandem Differential Mobility Analyser. The size range of the ambient aerosol particles that was investigated ranged from 8 nm to 30 nm in dry diameter. The measurements in a boreal forest site (SMEAR II station, Hyytiälä, Finland) showed that the growth factors during the days with production of ultrafine particles have a clear diurnal behaviour. The minimum growth factor was ca. 1.12-1.13 and was obtained during nighttime. The maximum values were obtained between 13:00 and 16:00. The median values for the maximum growth factor for 10 nm dry diameter particles was 1.26 and for 20 nm dry size 1.28. The measurements in a coastal site (Mace Head station, Carna, Ireland) showed that the new particles produced during nucleation bursts were non- or slightly hygroscopic, with growth factor ca. 1.0-1.1 for 8 nm and 10 nm particles. The background ultrafine particles that were not connected with nucleation bursts were found to be more hygroscopic.


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