Mass yields of secondary organic aerosols from the oxidation of α-pinene and real plant emissions
Item
Title (Dublin Core)
Mass yields of secondary organic aerosols from the oxidation of α-pinene and real plant emissions
Description (Dublin Core)
Biogenic volatile organic compounds (VOCs) are a significant source of global secondary organic aerosol (SOA); however, quantifying their aerosol forming potential remains a challenge. This study presents smog chamber laboratory work, focusing on SOA formation via oxidation of the emissions of two dominant tree species from boreal forest area, Scots pine (<i>Pinus sylvestris</i> L.) and Norway spruce (<i>Picea abies</i>), by hydroxyl radical (OH) and ozone (O<sub>3</sub>). Oxidation of α-pinene was also studied as a reference system. Tetramethylethylene (TME) and 2-butanol were added to control OH and O<sub>3</sub> levels, thereby allowing SOA formation events to be categorized as resulting from either OH-dominated or O<sub>3</sub>-initiated chemistry. SOA mass yields from α-pinene are consistent with previous studies while the yields from the real plant emissions are generally lower than that from α-pinene, varying from 1.9% at an aerosol mass loading of 0.69 μg m<sup>−3</sup> to 17.7% at 26.0 μg m<sup>−3</sup>. Mass yields from oxidation of real plant emissions are subject to the interactive effects of the molecular structures of plant emissions and their reaction chemistry with OH and O<sub>3</sub>, which lead to variations in condensable product volatility. SOA formation can be reproduced with a two-product gas-phase partitioning absorption model in spite of differences in the source of oxidant species and product volatility in the real plant emission experiments. Condensable products from OH-dominated chemistry showed a higher volatility than those from O<sub>3</sub>-initiated systems during aerosol growth stage. Particulate phase products became less volatile via aging process which continued after input gas-phase oxidants had been completely consumed.
Creator (Dublin Core)
Hao, L. Q.
Romakkaniemi, S.
Yli-Pirilä, P.
Joutsensaari, J.
Kortelainen, A.
Kroll, J. H.
Miettinen, P.
Vaattovaara, P.
Tiitta, P.
Jaatinen, A.
Kajos, M. K.
Holopainen, J. K.
Heijari, J.
Rinne, J.
Kulmala, M.
Worsnop, D. R.
Smith, J. N.
Laaksonen, A.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-11-1367-2011
https://acp.copernicus.org/articles/11/1367/2011/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
