quantification of black carbon mixing state from traffic: implications for aerosol optical properties
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2016
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Abstract
The climatic impacts of black carbon (BC) aerosol, an important
absorber of solar radiation in the atmosphere, remain poorly constrained and
are intimately related to its particle-scale physical and chemical
properties. Using particle-resolved modelling informed by quantitative
measurements from a soot-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 (HOA) in two distinct particle types: HOA-rich and BC-rich
particles. The average mass fraction of black carbon in HOA-rich and BC-rich
particle classes was < 0.1 and 0.8, 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.
| Reference Key |
willis2016atmosphericquantification
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|---|---|
| Authors | ;M. D. Willis;R. M. Healy;R. M. Healy;R. M. Healy;N. Riemer;M. West;J. M. Wang;C.-H. Jeong;J. C. Wenger;G. J. Evans;J. P. D. Abbatt;A. K. Y. Lee |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-4693-2016
|
| URL | |
| Keywords |
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