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- Title
Quantification of black carbon mixing state from traffic: implications for aerosol optical properties.
- Authors
Willis, M. D.; Healy, R. M.; Riemer, N.; West, M.; Wang, J. M.; Jeong, C. -H.; Wenger, J. C.; Evans, G. J.; Abbatt, J. P. D.; Lee, A. K. Y.
- Abstract
oot-particle aerosol mass spectrometer, we confirm that the mixing state (the distribution of co-emitted aerosol amongst fresh BC-containing particles) at the time of emission significantly affects BC-aerosol optical properties even after a day of atmospheric processing. Both single particle and ensemble aerosol mass spectrometry observations indicate that BC near the point of emission co-exists with hydrocarbon-like organic aerosol in two distinct particle types: HOA-rich and BC-rich particles. The average mass fraction of black carbon in HOA-rich and BC-rich particles was 0.02-0.08 and 0.72-0.93, respectively. Notably, approximately 90% of BC mass resides in BC-rich particles. This new measurement capability provides quantitative insight into the physical and chemical nature of BC-containing particles and is used to drive a particle-resolved aerosol box model. Significant differences in calculated single scattering albedo (an increase of 0.1) arise from accurate treatment of initial particle mixing state as compared to the assumption of uniform aerosol composition at the point of BC injection into the atmosphere.
- Subjects
CARBON-carbon bonds; CARBON-black; GAS mixtures; ATMOSPHERIC aerosols; OPTICAL properties
- Publication
Atmospheric Chemistry & Physics Discussions, 2015, Vol 15, Issue 22, p33555
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-15-33555-2015