edu.ucar.opensky::articles:10730 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T13:38:42.274154 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7b27vv4 Mass yields of secondary organic aerosols from the oxidation of alpha-pinene and real plant emissions 2011-02-16T00:00:00Z publication https://n2t.org/ark:/85065/d7b27vv4 https://doi.org/10.5194/acp-11-1367-2011 Hao, L. author Romakkaniemi, S. author Yli-Pirilä, P. author Joutsensaari, J. author Kortelainen, A. author Kroll, J. author Miettinen, P. author Vaattovaara, P. author Tiitta, P. author Jaatinen, A. author Kajos, M. author Holopainen, J. author Heijari, J. author Rinne, J. author Kulmala, M. author Worsnop, D. author Smith, James N. author Laaksonen, A. author UCAR/NCAR - Library publisher 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 (Pinus sylvestris L.) and Norway spruce (Picea abies), by hydroxyl radical (OH) and ozone (O₃). Oxidation of α-pinene was also studied as a reference system. Tetramethylethylene (TME) and 2-butanol were added to control OH and O₃ levels, thereby allowing SOA formation events to be categorized as resulting from either OH-dominated or O₃-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⁻³ to 17.7% at 26.0 μg m⁻³. 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 O₃, 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 O₃-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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Authors 2011. This work is distributed under the Creative Commons Attribution 3.0 License. None eng geoscientificInformation