AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Study of Ambient Aerosol in Riverside, California
HEEJUNG JUNG, Yue Lin, Roya Bahreini, Akua Asa-Awuku, Kihong Park, Seung-Bok Lee, Gwi Nam Bae, University of California, Riverside
Abstract Number: 355 Working Group: Remote and Regional Atmospheric Aerosols
Abstract Riverside, CA is known for abundance of SOA during photochemical season. The study aims to relate the particle effective density and solid vs total particle size distribution measurement to the mixing state of the aerosol and to estimate potential health effects from particles. The ratio of volatile and non-volatile particles was measured and evaluated with respect to particle number, surface area, and mass. A catalytic stripper (CS) was used with a SMPS system to remove volatile component in ambient aerosol for size distribution measurement. Particle size distributions measured with and without a catalytic stripper will be presented. Particle effective density was also measured semi-continuously at the same location. BC was measured using MAAP and aethalometer. AMS was used to measure chemical composition of non-refractive PM.
In addition, there is an increased interest to monitor temporarily and spatially resolved ultrafine particle concentrations in ambient air. Total particle number (TPN) concentrations measured by earlier studies showed an anti-correlation with PM2.5 therefore not appropriate as a metric for monitoring. Solid particle counting method is a well-established technique to measure emissions from vehicle exhaust. It eliminates contribution of semivolatiles using a volatile particle remover and achieves more consistent and repeatable measurement for vehicle exhaust particle emissions. This study applied a similar approach to measure solid particle size distributions in ambient air in Riverside, CA.