Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment
Abstract
The impacts of soot particles on climate and human health depend on the concentration of black carbon (BC) as well as the thickness and composition of the coating material, i.e., organic and inorganic compounds internally mixed with BC. In this study, the size-resolved chemical composition of BC-containing aerosol was measured using a high-resolution soot particle aerosol mass spectrometer (SP-AMS) during wintertime in Fresno, California, a location influenced by abundant combustion emissions and frequent fog events. Concurrently, particle optical properties were measured to investigate the BC absorption enhancement. Positive matrix factorization (PMF) analysis was performed on the SP-AMS mass spectral measurements to explore the sources of soot particles and the atmospheric processes affecting the properties of BC coatings. The analysis revealed that residential woodburning and traffic are the dominant sources of soot particles. Alongside primary soot particles originating from biomass burning (BBOABC) and vehicles (HOABC) two distinct types of processed BC-containing aerosol were identified: fog-related oxidized organic aerosol (FOOABC) and winter-background OOABC (WOOABC). Both types of OOABC showed evidence of having undergone aqueous processing, albeit with differences. The concentration of FOOABC was substantially elevated during fog events, indicating the formation of aqueous secondary organic aerosol (aqSOA) within fog droplets. On themore »
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center; Univ. of California, Davis, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); California Air Resources Board
- Contributing Org.:
- PNNL, BNL, ANL, ORNL
- OSTI Identifier:
- 2229017
- Alternate Identifier(s):
- OSTI ID: 2279037
- Grant/Contract Number:
- SC0022140; SC0020182; 13-330
- Resource Type:
- Published Article
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 23 Journal Issue: 23; Journal ID: ISSN 1680-7324
- Publisher:
- Copernicus GmbH
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Farley, Ryan N., Collier, Sonya, Cappa, Christopher D., Williams, Leah R., Onasch, Timothy B., Russell, Lynn M., Kim, Hwajin, and Zhang, Qi. Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment. Germany: N. p., 2023.
Web. doi:10.5194/acp-23-15039-2023.
Farley, Ryan N., Collier, Sonya, Cappa, Christopher D., Williams, Leah R., Onasch, Timothy B., Russell, Lynn M., Kim, Hwajin, & Zhang, Qi. Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment. Germany. https://doi.org/10.5194/acp-23-15039-2023
Farley, Ryan N., Collier, Sonya, Cappa, Christopher D., Williams, Leah R., Onasch, Timothy B., Russell, Lynn M., Kim, Hwajin, and Zhang, Qi. Thu .
"Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment". Germany. https://doi.org/10.5194/acp-23-15039-2023.
@article{osti_2229017,
title = {Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment},
author = {Farley, Ryan N. and Collier, Sonya and Cappa, Christopher D. and Williams, Leah R. and Onasch, Timothy B. and Russell, Lynn M. and Kim, Hwajin and Zhang, Qi},
abstractNote = {The impacts of soot particles on climate and human health depend on the concentration of black carbon (BC) as well as the thickness and composition of the coating material, i.e., organic and inorganic compounds internally mixed with BC. In this study, the size-resolved chemical composition of BC-containing aerosol was measured using a high-resolution soot particle aerosol mass spectrometer (SP-AMS) during wintertime in Fresno, California, a location influenced by abundant combustion emissions and frequent fog events. Concurrently, particle optical properties were measured to investigate the BC absorption enhancement. Positive matrix factorization (PMF) analysis was performed on the SP-AMS mass spectral measurements to explore the sources of soot particles and the atmospheric processes affecting the properties of BC coatings. The analysis revealed that residential woodburning and traffic are the dominant sources of soot particles. Alongside primary soot particles originating from biomass burning (BBOABC) and vehicles (HOABC) two distinct types of processed BC-containing aerosol were identified: fog-related oxidized organic aerosol (FOOABC) and winter-background OOABC (WOOABC). Both types of OOABC showed evidence of having undergone aqueous processing, albeit with differences. The concentration of FOOABC was substantially elevated during fog events, indicating the formation of aqueous secondary organic aerosol (aqSOA) within fog droplets. On the other hand, WOOABC was present at a relatively consistent concentration throughout the winter and was likely related to the formation of secondary organic aerosol (SOA) in both the gas phase and aerosol liquid water. By comparing the chemical properties and temporal variations in FOOABC and WOOABC, we gain insights into the key aging processes of BC aerosol. It was found that aqueous-phase reactions facilitated by fog droplets had a significant impact on the thickness and chemical composition of BC coatings, thereby affecting the light absorption and hygroscopic properties of soot particles. These findings underscore the important role of chemical reactions occurring within clouds and fogs and influencing the climate forcing of BC aerosol in the atmosphere},
doi = {10.5194/acp-23-15039-2023},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 23,
volume = 23,
place = {Germany},
year = {Thu Dec 07 00:00:00 EST 2023},
month = {Thu Dec 07 00:00:00 EST 2023}
}
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