Light Absorption by Ambient Black and Brown Carbon and its Dependence on Black Carbon Coating State for Two California, USA, Cities in Winter and Summer

Cappa, Christopher D.; Zhang, Xiaolu; Russell, Lynn M.; Collier, Sonya; Lee, Alex K. Y.; Chen, Chia-Li; Betha, Raghu; Chen, Sijie; Liu, Jun; Price, Derek J.; Sanchez, Kevin J.; McMeeking, Gavin R.; Williams, Leah R.; Onasch, Timothy B.; Worsnop, Douglas R.; Abbatt, Jon; Zhang, Qi

doi:10.1029/2018JD029501

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Light Absorption by Ambient Black and Brown Carbon and its Dependence on Black Carbon Coating State for Two California, USA, Cities in Winter and Summer

2019
By Cappa, Christopher D. ; Zhang, Xiaolu ; Russell, Lynn M. ; ...
Source: Journal of Geophysical Research: Atmospheres, 124(3), 1550-1577

[PDF-3.97 MB]

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Cappa, Christopher D. ; Zhang, Xiaolu ; Russell, Lynn M. ; Collier, Sonya ; Lee, Alex K. Y. ; ... More +

Cappa, Christopher D. ; Zhang, Xiaolu ; Russell, Lynn M. ; Collier, Sonya ; Lee, Alex K. Y. ; Chen, Chia-Li ; Betha, Raghu ; Chen, Sijie ; Liu, Jun ; Price, Derek J. ; Sanchez, Kevin J. ; McMeeking, Gavin R. ; Williams, Leah R. ; Onasch, Timothy B. ; Worsnop, Douglas R. ; Abbatt, Jon ; Zhang, Qi Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences)
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Observations from a wintertime and summertime field campaign are used to assess the relationship between black and brown carbon (BC and BrC, respectively) optical properties and particle composition and coating state. The wintertime campaign, in Fresno, CA, was impacted by primary emissions from residential wood burning, secondary organic and inorganic particle formation, and BC from motor vehicles. Two major types of BrC were observed in wintertime. One occurred primarily at night—the result of primary biomass burning emissions. The second was enhanced in daytime and strongly associated with particulate nitrate and the occurrence of fog. The biomass-burning-derived BrC absorbed more strongly than the nitrate-associated BrC but had a weaker wavelength dependence. The wintertime BC-specific mass absorption coefficient (MACBC) exhibited limited dependence on the ensemble-average coating-to-BC mass ratio (Rcoat-rBC) at all wavelengths, even up to Rcoat-rBC of ~5. For the summertime campaign, in Fontana, CA, BC dominated the light absorption, with negligible BrC contribution even after substantial photochemical processing. The summertime MACBC exhibited limited dependence on Rcoat-rBC, even up to ratios of >10. Based on the four classes of BC-containing particles identified by Lee et al. (2017, https://doi.org/10.5194/acp-17-15055-2017) for the summertime measurements, the general lack of an absorption enhancement can be partly—although not entirely—attributed to an unequal distribution of coating materials between the BC-containing particle types. These observations demonstrate that in relatively near-source environments, even those impacted by strong secondary aerosol production, the ensemble-average, mixing-induced absorption enhancement for BC due to coatings can be quite small.
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Light Absorption Soot
Source:

Journal of Geophysical Research: Atmospheres, 124(3), 1550-1577
DOI:

https://doi.org/10.1029/2018JD029501
Document Type:

Journal Article
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Fontana (Calif.) ; Fresno (Calif.)

Fontana (Calif.) ; Fresno (Calif.) Less -
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urn:sha256:632368241b2b0ceb8f43dd83c1e9bb96c0ec4670520f69e3734af76e03a78c24
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https://repository.library.noaa.gov/view/noaa/27960/noaa_27960_DS1.pdf
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Light Absorption by Ambient Black and Brown Carbon and its Dependence on Black Carbon Coating State for Two California, USA, Cities in Winter and Summer

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