AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Optical and Microphysical Properties of Aerosols Emitted from a Marine Engine Using Different Fuels and Engine Loads
ROYA BAHREINI, Justin Dingle, Yu Jiang, Kent Johnson, Wayne Miller, Stephanie Gagne, Kevin Thomson, Tak Chan, Yue Lin, Heejung Jung, Xinze Peng, Paul Van Rooy, David R. Cocker III, Gavin McMeeking, Bob Cary, University of California, Riverside
Abstract Number: 115 Working Group: Aerosol Physics
Abstract Marine vessels are a large source of atmospheric particles regionally (i.e., in coastal regions) and globally. Limited studies have been carried out on direct microphysical characterization of aerosols emitted from marine vessels. Here, we present results from laboratory-based emission tests with a diesel marine engine, as a function of fuel type and engine load. The tests were carried out at University of California, College of Engineering- Center for Environmental Research and Technology’s Heavy-Duty Engine Dynamometer Test Facility. A large suite of instruments, including photoacoustic (PAX-375 and MSS), laser-induced incandescence (SP2 and LII), and thermal/optical (semi-continuous and offline OC-EC) techniques, was used to measure various optical and microphysical properties of the emitted aerosols, under different operating conditions of the engine. Additionally, instruments alternated between sampling the non-conditioned and conditioned (i.e., downstream of a catalytic stripper/sulfur adsorber) exhaust stream to understand the influence of co-emitted pollutants on the apparent aerosol characteristics. In this presentation, we report on single scattering albedo (SSA) and mass absorption coefficient (MAC) of exhaust aerosols, using different fuel types, engine loads, and exhaust conditioning. We examine how different estimates of MAC are, depending on the instrument used to measure aerosol mass. Variations in SSA and MAC with exhaust aerosol size distributions are also explored.