AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Chemical Characterization of Organic Aerosol during SOAS Using High Resolution Aerosol Mass Spectrometer
LU XU, Hongyu Guo, Christopher Boyd, Kate Cerully, Aikaterini Bougiatioti, Laura King, Rodney Weber, Athanasios Nenes, Nga Lee Ng, Georgia Institute of Technology
Abstract Number: 276 Working Group: Air Quality and Climate in the Southeast US: Insights from Recent Measurement Campaigns
Abstract Secondary organic aerosol (SOA) has important impacts on climate, visibility, and human health. However, SOA formation is controlled by complex processes which are not well understood. Specifically, to what extent do human activities affect SOA formation and SOA evolution is highly uncertain. The interaction between anthropogenic and biogenic emissions was investigated in Southern Oxidant and Aerosol Study (SOAS) by deploying a High-Resolution Time-of-Flight Mass Spectrometer (HR-ToF-AMS). Positive Matrix Factorization (PMF) analysis on organic aerosol (OA) resolved three SOA factors, including isoprene-derived organic aerosol (Isop_OA), semi-volatile oxygenated organic aerosol (SVOOA), and low-volatility oxygenated organic aerosol (LVOOA). It is found that all OA factors are correlated with at least one anthropogenic component. The formation of Isop_OA is greatly controlled by sulfate level. SVOOA can be related to reaction between monoterpenes and NO3 radicals. LVOOA shows association with black carbon, where back trajectory analysis indicates that both can arise from long range transport. Analysis will be discussed to reveal the detailed interactions between anthropogenic and biogenic emissions on SOA formation.