Details

Autor(en) / Beteiligte

• Massoli, P.
• Lambe, A. T.
• Ahern, A. T.
• Williams, L. R.
• Ehn, M.
• Mikkilä, J.
• Canagaratna, M. R.
• Brune, W. H.
• Onasch, T. B.
• Jayne, J. T.
• Petäjä, T.
• Kulmala, M.
• Laaksonen, A.
• Kolb, C. E.
• Davidovits, P.
• Worsnop, D. R.

Titel

Relationship between aerosol oxidation level and hygroscopic properties of laboratory generated secondary organic aerosol (SOA) particles

Ist Teil von

• Geophysical research letters, 2010-12, Vol.37 (24), p.np-n/a

Ort / Verlag

Washington, DC: Blackwell Publishing Ltd

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Laboratory experiments investigated the relationship between oxidation level and hygroscopic properties of secondary organic aerosol (SOA) particles generated via OH radical oxidation in an aerosol flow reactor. The hygroscopic growth factor at 90% RH (HGF90%), the CCN activity (κORG,CCN) and the level of oxidation (atomic O:C ratio) of the SOA particles were measured. Both HGF90% and κORG,CCN increased with O:C; the HGF90% varied linearly with O:C, while κORG,CCN mostly followed a nonlinear trend. An average HGF90% of 1.25 and κORG,CCN of 0.19 were measured for O:C of 0.65, in agreement with results reported for ambient data. The κORG values estimated from the HGF90% (κORG,HGF) were 20 to 50% lower than paired κORG,CCN values for all SOA particles except 1,3,5‐trimethylbenzene (TMB), the least hygroscopic of the SOA systems. Within the limitations of instrumental capabilities, we show that differences in hygroscopic behavior among the investigated SOA systems may correspond to differences in elemental composition.