Japan Geoscience Union Meeting 2016

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Symbol A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS12] Atmospheric Chemistry

Wed. May 25, 2016 3:30 PM - 5:00 PM 303 (3F)

Convener:*Hitoshi Irie(Center for Environmental Remote Sensing, Chiba University), Toshinobu Machida(National Institute for Environmental Studies), Hiroshi Tanimoto(National Institute for Environmental Studies), Yoko Iwamoto(Faculty of Science Division I, Tokyo University of Science), Chair:Motoki Sasakawa(National Institute for Environmental Studies), Motoki Sasakawa(NIES National Institute of Environmental Studies), Hitoshi MATSUI(Graduate School of Environmental Studies, Nagoya University)

4:30 PM - 4:45 PM

[AAS12-11] Volatility measurements of SOA formed from α-pinene ozonolysis and data interpretation

*Kei Sato1, Yuji Fujitani1, Satoshi Inomata1, Yu Morino1, Kiyoshi Tanabe1, Akinori Takami1 (1.National Institute for Environmental Studies)

Keywords:Secondary organic aerosol, Heterogeneous reaction, Oligomer formation

The volatility basis-set (VBS) model employs the secondary organic aerosol (SOA) volatilities evaluated from yield curve measurements. To verify the VBS model, we evaluated the volatilities of dry α-pinene ozonolysis SOA not only from yield curve measurements but also from thermodenuder-AMS measurements, LC-MS and PTR-MS chemical composition analysis, and external dilution chamber measurements. We evaluated also the uncertainty of volatility determined by each experimental metod. The results of thermodenuder-AMS measurements, chemical composition analysis, and external dilution chamber measurements showed that lower-volatility organic compounds are present in SOA particles compared with the results of yield curve measurements. The thermal and dilution properties of oligomers, produced in the particle phase by heterogenious reactions, will strongly affect the total properties of SOA particles under dry conditions.