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Hi Everyone, SOCAAR is pleased to announce our next seminar: Wednesday, April 6, 2016 2 - 3 PM 200 College Street, WB 407 Bridging cloud condensation nuclei activity and volatility of oxidized organic aerosol Shunsuke Nakao Assistant Professor Department of Chemical & Biomolecular Engineering Clarkson University Aging of atmospheric organic aerosol (OA) has been studied in terms of average molecular properties such as elemental ratios (O/C, H/C), volatility, and hygroscopicity. Correlations between O/C and hygroscopicity (or cloud condensation nuclei activity), represented by êorg, are a computationally efficient approach to estimate the impact of aerosol aging on cloud formation and climate; however, previously reported correlations between these two variables are largely empirical and vary widely in their slopes and extrapolations to high O/C values. I will present a theoretical framework based on inferred molecular formulas (CxHyOz) to constrain the relationships between êorg, O/C, volatility, and molecular size. I will use the theoretical framework to analyze previously-reported data for observed êorg of highly oxidized OA to extract additional information on physicochemical properties of organic aerosol. If you are unable to join us for the seminar in person, we will be broadcasting the presentations live during the seminar using GoToMeeting software. Please feel free to join us online using a web-browser or by calling in and using the webviewing software. If you do decide to join us, please remember to mute your microphone. If you have any questions during the meeting you are welcome to contact me by email, or by using the GoToMeeting chat. 1. Please join my meeting. https://global.gotomeeting.com/join/494663709 2. Use your microphone and speakers (VoIP) - a headset is recommended. Or, call in using your telephone. Dial +1 (647) 497-9379 Access Code: 494-663-709 Audio PIN: Shown after joining the meeting Meeting ID: 494-663-709