AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Contribution of Biomass Burning and Traffic Emissions to Aerosol Optical Properties at a Rural Site in Southeast England During the Winter ClearfLo IOP
Paola Massoli, Allison Aiken, Kyle Gorkowski, Scott Herndon, Edward Fortner, John Jayne, William Brooks, Puneet Chhabra, Leah Williams, Nga Lee Ng, Timothy Onasch, Jonathan Franklin, Mavendra Dubey, Douglas Worsnop, ANDREW FREEDMAN, Aerodyne Research, Inc.
Abstract Number: 307 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract We present results on the optical characterization of aerosols during the ClearfLo (Clean Air for London) Intensive Operating Period that took place from mid-January to mid-February, 2012 at a rural site southeast of London, England. The site, situated at the Kent Showground in Detling, is located approximately 50 km southeast of central London. Data were collected from two separate inlets that were outfitted with 2.5 micron cutoff impactors. The first inlet was routed to a CAPS PMex (Aerodyne Research, ARI) particle optical extinction monitor and a Multi-Angle Absorption Photometer (MAAP) (ThermoFisher), both operated a nominal wavelength of 630 nm. The second inlet was routed to a CAPS PMex monitor operated at 450 nm and a Photo-Acoustic Soot Spectrometer (PASS-3) (Droplet Measurement Technologies) which provided particle absorption at three wavelengths (780 nm, 532 nm and 405 nm). The second inlet also contained a provision for alternately routing the air sample flow through a ARI particle denuder operated at temperatures up to 250 ºC. Optical extinction, absorption and the single scattering albedo (SSA) were measured at several wavelengths over a period of approximately three weeks. Over the course of the campaign, the sampled air masses were of local (traffic emissions, biomass burning), regional (Thames Estuary) or distant (continental European) origin. This works reports on the contribution of the various types of air masses to the measured aerosol optical properties.