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Estimation of Effective Particle Mass Emission Indices from In-use Commercial Aircraft based on Field Observations
KENTARO MISAWA, Yuji Fujitani, Akihiro Fushimi, Yoshiko Murashima, Hiromu Sakurai, Nobuyuki Takegawa, Tokyo Metropolitan University
Abstract Number: 366
Working Group: Urban Aerosols
Abstract
Particle number size distributions in exhaust plumes from in-use commercial aircraft were observed using a scanning mobility particle sizer (SMPS) and an engine exhaust particle sizer (EEPS) at an observation point near the major runway of Narita International Airport from February 5 to 26, 2018. The mixing ratios of carbon dioxide (CO2) were also measured simultaneously. We found reasonably good agreement between the SMPS and EEPS data for selected time periods. We used the EEPS data for estimating the particle mass concentrations because of its fast response time. The majority of particle number concentrations were found at diameters smaller than 50 nm in aircraft exhaust plumes. The mass concentrations of particles in the diameter range of 6-560 nm (referred to as the submicron size range) did not exhibit significant diurnal variations, whereas those with diameters smaller than 50 nm (referred to as the nanoparticle size range) showed significant enhancements in the morning and evening, corresponding to a time slot with frequent aircraft traffics (rush hours). The “effective” particle mass emission indices (EIs) from an ensemble of aircraft plumes were estimated by using the EEPS and CO2 data obtained during the evening rush hours on each day. The average EIs were found to be 31-107 mg (kg-fuel)-1 for the submicron size range and 14-75 mg (kg-fuel)-1 for the nanoparticle size range. The effective particle mass EIs derived in this study were found in the lower bound of the range of particle mass EIs reported by earlier studies.