Multicomponent Nucleation Involving Organic Amine Compounds
HUAN YU, Andrey Markovich, Mark E Erupe, Shan-hu Lee
Kent State University
Abstract Number: 631
Working Group: Aerosol Physics
Last modified: April 4, 2011
Field observations and quantum chemical calculations have shown that organic amine compounds may be important for new particle formation processes involving sulfuric acid in the atmosphere. We have performed laboratory studies of multicomponent nucleation of sulfuric, water, and amines (ammonia), using a temperature- and RH-controlled fast flow nucleation reactor, to investigate the role of amines in atmospheric aerosol nucleation. A Particle Size Magnifier (PSM, AirModus A09), a Condensation Particle Counter (CPC, TSI3776) and a nano-Differential Mobility Analyzer (DMA, TSI3085) were used to measure number concentrations and size distributions of particles generated with and without amines. Several amine compounds, directly relevant to the atmosphere, were chosen in this study. Enhancement factors (EF) of nucleation due to amines were derived under high- (>10$^8 molecules cm$^(-3)) and moderate-sulfuric acid (10$^6~10$^7 molecules cm$^(-3)) conditions. EFs were also measured as a function of amine concentration. Our results show that amines act surprisingly similarly to ammonia. Aerosol models thus should take into account inorganic and organic bases together to fully understand the widespread new particle formation events in the lower troposphere.