AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Effects of Atmospheric Conditions on the Composition of Secondary Organic Aerosol Formed from the Oxidation of Isoprene and Monoterpenes
MEGAN CLAFLIN, Paul Ziemann, University of Colorado
Abstract Number: 447 Working Group: Effects of NOx and SO2 on BVOC Oxidation and Organic Aerosol Formation
Abstract Motivated by the Southern Oxidant and Aerosol Study (SOAS) field campaign of 2013, a series of environmental chamber experiments have been conducted to study the effect of environmental conditions (VOC, oxidant, NOx, RH, particle acidity) on the composition of secondary organic aerosol (SOA) formed from the oxidation of the major volatile organic compounds (VOCs) present during the field campaign. Isoprene and selected monoterpenes were reacted with OH radicals, NO$_3 radicals, and O$_3 under conditions that mimic those observed during SOAS, and the composition of the SOA formed was characterized using derivatization-spectrophotometric methods and FTIR to quantify carbonyl, carboxyl, hydroxyl, ester, peroxide, and nitrate groups in the aerosol sample. In tandem with derivatization methods, further molecular analysis was conducted on select systems using real-time and off-line mass spectrometry along with liquid and gas chromatography. Through a collaboration with the Russell group at SIO-UCSD, our groups will compare the composition of the chamber aerosol with field samples collected during the SOAS campaign in an attempt to identify the VOCs and chemistry responsible for SOA formation in the southeast US.