Articles | Volume 20, issue 24
Atmos. Chem. Phys., 20, 15635–15664, 2020
https://doi.org/10.5194/acp-20-15635-2020
Atmos. Chem. Phys., 20, 15635–15664, 2020
https://doi.org/10.5194/acp-20-15635-2020

Research article 17 Dec 2020

Research article | 17 Dec 2020

Measurements to determine the mixing state of black carbon emitted from the 2017–2018 California wildfires and urban Los Angeles

Joseph Ko et al.

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Cited articles

Adachi, K., Chung, S. H., and Buseck, P. R.: Shapes of soot aerosol particles and implications for their effects on climate, J. Geophys. Res.-Atmos., 115, 1–9, https://doi.org/10.1029/2009JD012868, 2010. 
Adachi, K., Moteki, N., Kondo, Y., and Igarashi, Y.: Mixing states of light-absorbing particles measured using a transmission electron microscope and a single-particle soot photometer in Tokyo, Japan, J. Geophys. Res., 121, 9153–9164, https://doi.org/10.1002/2016JD025153, 2016. 
Akagi, S. K., Craven, J. S., Taylor, J. W., McMeeking, G. R., Yokelson, R. J., Burling, I. R., Urbanski, S. P., Wold, C. E., Seinfeld, J. H., Coe, H., Alvarado, M. J., and Weise, D. R.: Evolution of trace gases and particles emitted by a chaparral fire in California, Atmos. Chem. Phys., 12, 1397–1421, https://doi.org/10.5194/acp-12-1397-2012, 2012. 
Baumgardner, D., Kok, G. L., and Raga, G. B.: On the diurnal variability of particle properties related to light absorbing carbon in Mexico City, Atmos. Chem. Phys., 7, 2517–2526, https://doi.org/10.5194/acp-7-2517-2007, 2007. 
Beccario, C.: Earth: a visualization of global weather conditions, available at: https://earth.nullschool.net/, last access: 26 August 2019. 
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Black carbon (BC) is the second strongest climate forcing pollutant in the atmosphere, after carbon dioxide. Here, we seek to understand how BC microphysical properties vary with atmospheric contexts, as these properties can influence its radiative forcing. Consistent with previous studies, we found that biomass burning BC had thicker coatings and larger core diameters than fossil fuel BC. We also present evidence to show that atmospheric aging also increases BC coating thickness.
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