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  Light absorption of black carbon and brown carbon in winter in North China Plain: comparisons between urban and rural sites

Sun, J., Xiea, C., Xu, W., Chen, C., Ma, N., Xu, W., et al. (2021). Light absorption of black carbon and brown carbon in winter in North China Plain: comparisons between urban and rural sites. Science of the Total Environment, 770: 144821. doi:10.1016/j.scitotenv.2020.144821.

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 Creators:
Sun, Jiaxing, Author
Xiea, Conghui, Author
Xu, Weiqi, Author
Chen, Chun, Author
Ma, Nan, Author
Xu, Wanyun, Author
Lei, Lu, Author
Li, Zhijie, Author
He, Yao, Author
Qiu, Yanmei, Author
Wang, Qingqing, Author
Pan, Xiaole, Author
Su, Hang1, Author              
Cheng, Yafang1, Author              
Wu, Cheng, Author
Fu, Pingqing, Author
Wang, Zifa, Author
Sun, Yele, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: The light absorption black carbon (BC) and brown carbon (BrC) are two important sources of uncertainties in radiative forcing estimate. Here we investigated the light absorption enhancement (Eabs) of BC due to coated materials at an urban (Beijing) and a rural site (Gucheng) in North China Plain (NCP) in winter 2019 by using a photoacoustic extinctiometer coupled with a thermodenuder. Our results showed that the average (±1σ) Eabs was 1.32 (±0.15) at the rural site, which was slightly higher than that at the urban site (1.24 ± 0.15). The dependence of Eabs on coating materials was found to be relatively limited at both sites. However, Eabs presented considerable increases as a function of relative humidity below 70%. Further analysis showed that Eabs during non-heating period in Beijing was mainly caused by secondary components, while it was dominantly contributed by enhanced primary emissions in heating season at both sites. In particular, aerosol particles mixed with coal combustion emissions had a large impact on Eabs (>1.40), while the fresh traffic emissions and freshly oxidized secondary OA (SOA) had limited Eabs (1.00–1.23). Although highly aged or aqueous-phase processed SOA coated on BC showed the largest Eabs, their contributions to the bulk absorption enhancement were generally small. We also quantified the absorption of BrC and source contributions. The results showed the BrC absorption at the rural site was nearly twice that of urban site, yet absorption Ångström exponents were similar. Multiple linear regression analysis highlighted the major sources of BrC being coal combustion emissions and photochemical SOA at both sites with additional biomass burning at the rural site. Overall, our results demonstrated the relatively limited winter light absorption enhancement of BC in different chemical environments in NCP, which needs be considered in regional climate models to improve BC radiative forcing estimates.

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Language(s): eng - English
 Dates: 2021-05-20
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scitotenv.2020.144821
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Title: Science of the Total Environment
  Abbreviation : Sci. Total Environ.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 770 Sequence Number: 144821 Start / End Page: - Identifier: ISSN: 0048-9697
CoNE: https://pure.mpg.de/cone/journals/resource/954925457007