AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Optical Properties of Secondary Organic Aerosol Generated via Photooxidation in Single and Multiple Precursor Systems
ALEXANDER FRIE, Justin Dingle, Stephen Zimmerman, Justin Min, Roya Bahreini, University of California, Riverside
Abstract Number: 756 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract The optical properties of secondary organic aerosol from the photooxidation of a variety of precursors were investigated. Optical properties of organic aerosols are of interest as they control the aerosol direct effect, a highly uncertain component of future climate predictions. Compounds used as SOA precursors include longifolene, mixtures of longifolene+phenol, and 1-methylnaphthalene+phenol. All SOA was formed in an atmospheric chamber through photooxidation under low NOx conditions, using H2O2 as a hydroxyl radical source. During SOA formation, absorption and scattering coefficients at 375 nm and extinction coefficient at 632 nm were monitored. Additionally, particle chemistry was monitored via an aerosol mass spectrometer in order to investigate the chemical drivers of organic aerosol optical properties. Results will include single scattering albedo (SSA), mass normalized scattering and absorption coefficients (MSC and MAC), and chemical characteristics for each SOA type.