title: Commercial aircraft engine emissions characterization of in-use aircraft at Hartsfield-Jackson Atlanta International Airport.
abstract: The emissions from in-use commercial aircraft engines have been analyzed for selected gas-phase species and particulate characteristics using continuous extractive sampling 1-2 min downwind from operational taxi- and runways at Hartsfield-Jackson Atlanta International Airport. Using the aircraft tail numbers, 376 plumes were associated with specific engine models. In general, for takeoff plumes, the measured NOx emission index is lower (approximately 18%) than that predicted by engine certification data corrected for ambient conditions. These results are an in-service observation of the practice of "reduced thrust takeoff". The CO emission index observed in ground idle plumes was greater (up to 100%) than predicted by engine certification data for the 7% thrust condition. Significant differences are observed in the emissions of black carbon and particle number among different engine models/technologies. The presence of a mode at approximately 65 nm (mobility diameter) associated with takeoff plumes and a smaller mode at approximately 25 nm associated with idle plumes has been observed. An anticorrelation between particle mass loading and particle number concentration is observed.
authors.affiliation: Aerodyne Research, Inc. Billerica, Massachusetts 01821, USA. herndon@aerodyne.com
authors.forename: Scott C
authors.initials: SC
authors.lastname: Herndon
authors.forename: John T
authors.initials: JT
authors.lastname: Jayne
authors.forename: Prem
authors.initials: P
authors.lastname: Lobo
authors.forename: Timothy B
authors.initials: TB
authors.lastname: Onasch
authors.forename: Gregg
authors.initials: G
authors.lastname: Fleming
authors.forename: Donald E
authors.initials: DE
authors.lastname: Hagen
authors.forename: Philip D
authors.initials: PD
authors.lastname: Whitefield
authors.forename: Richard C
authors.initials: RC
authors.lastname: Miake-Lye
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000401:Aircraft; D002244:Carbon / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D004784:Environmental Monitoring; D005557:Formaldehyde / Q000032:analysis; D005845:Georgia; D009569:Nitric Oxide / Q000032:analysis; D009585:Nitrogen Dioxide / Q000032:analysis; D052638:Particulate Matter / Q000032:analysis; D013696:Temperature; D014919:Wind
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D002245:Carbon Dioxide; D005557:Formaldehyde; D009569:Nitric Oxide; D002244:Carbon; D002248:Carbon Monoxide; D009585:Nitrogen Dioxide