Atmospheric aerosol and ion characteristics during EUCAP (Eucalypt Forest Aerosols and Precursors)
Suni, Tanja , Ristovski, Zoran, Morawska, Lidia, Guenther, Alex, Turnipseed, Andrew , Sogacheva, Larisa, Kulmala, M. , Hakkola, Hannele, & Back, Jaana (2007) Atmospheric aerosol and ion characteristics during EUCAP (Eucalypt Forest Aerosols and Precursors). In 17th International Conference on Nucleation and Atmospheric Aerosols, August 13 - 17th, Galaway, Ireland.
We measured the characteristics and dynamics of atmospheric ions, aerosol particles, and their precursors in an intensive field campaign in a Eucalypt forest in Tumbarumba, South-East Australia, in November 2006. The measured size range of ions was 0.34 to 40 nm and that of aerosol particles approximately 10 to 168 nm, and for observing their size distributions we used an Air Ion Spectrometer (AIS) and a Scanning Mobility Particle Sizer (SMPS). We also measured the hygroscopic and chemical properties of the particles with a Volatility-Humidity Tandem Differential Mobility Analyser (VH-TDMA). The total concentration of ultrafine aerosol particles was measured with a Condensational Particle Counter (CPC). Furthermore, we measured ambient concentrations of volatile organic compounds (VOC), SOx, NOx/NOy, and O3. Finally, we modelled the 96-h back trajectories of air masses arriving at the site and observed that the arrival directions varied greatly and included trajectories that travelled only over land as well as ones that travelled most of the time over the ocean. On the most polluted day, the air masses arrived approximately from the direction of greater Sydney / Newcastle coal mine area. The total concentration of ultrafine aerosol particles was approximately 3500 cm-3, and daytime aerosol formation took place on 64% of days with acceptable data. The dominant VOCs were isoprene, eucalyptol, a- and b-pinene, camphene, and limonene. The measured hygroscopic growth factors (Gh) at RH of 90% varied from 1.1 to 1.5. The smallest Gh were observed for aged accumulation mode particles in early mornings, and the largest Gh occurred for the freshly nucleated particles on Nov 10, the day with the highest concentration of SO2.
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|Item Type:||Conference Paper|
|Keywords:||Biogenic aerosol formation, atmospheric ions, VOC, Eucalypt forest, nucleation|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2007 Springer|
|Copyright Statement:||This is the author-version of the work. Conference proceedings published, by Springer Verlag, will be available via SpringerLink. http://www.springerlink.com|
|Deposited On:||27 Sep 2007|
|Last Modified:||11 Aug 2011 03:59|
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