AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Trends in Oxygenated Organic Compound Composition and Water Content in Atmospheric Particles during SOAS
KERRI PRATT, Eric Boone, Alexander Laskin, Julia Laskin, Hongyu Guo, Rodney J. Weber, Victor Nhliziyo, Andrew Ault, Steve Bertman, University of Michigan
Abstract Number: 246 Working Group: The Role of Water in Aerosol Chemistry
Abstract The combination of significant biogenic and anthropogenic emissions in the humid southeastern United States has resulted in a cooling haze, consisting of aqueous particles. A substantial mass fraction of these submicron atmospheric particles corresponds to secondary organic aerosol formed from the oxidation of biogenic volatile organic compounds. Aqueous-phase reactions in deliquesced aerosol particles are suggested to increase secondary organic aerosol mass and change the chemical composition of the atmospheric particles. In this study, atmospheric particles were collected at the Centreville, Alabama ground site during the summer 2013 Southern Oxidant and Aerosol Study (SOAS). We utilized nanospray desorption electrospray ionization (nano-DESI) and direct electrospray ionization coupled with high resolution mass spectrometry to probe the organic molecular composition of the collected particles. Our results indicate several hundred unique compounds identified in the atmospheric particles, with significant fractions of CHO and CHOS-containing compounds. In particular, the diversity of oxygenated compounds across time will be investigated and compared to measured aerosol liquid water content. These data provide insights into the diversity of organic compounds present in the aqueous atmospheric particles in the southeastern United States; this information will improve our understanding of atmospheric organic particle budgets and climate impacts.