Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling

Jiang, Hongxing; Li, Jun; Sun, Rong; Liu, Guoqing; Tian, Chongguo; Tang, Junyan; Cheng, Zhu; Zhu, Sanyuan; Zhong, Guangcai; Ding, Xiang; Zhang, Gan

doi:10.1002/essoar.10506028.1

2021

DOI: 10.1002/essoar.10506028.1

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Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling

Hongxing Jiang

Jun Li

Rong Sun

et al.

Abstract: Atmospheric brown carbon (BrC) has gained attention over the past decades due to its significant impact on the radiative balance of the earth, which may cause uncertainties in global radiative forcing estimation (An-

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Measurement report: Long-emission-wavelength chromophores dominate the light absorption of brown carbon in aerosols over Bangkok: impact from biomass burning

et al. 2021

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Abstract. Chromophores represent an important portion of light-absorbing species, i.e., brown carbon. Yet knowledge of what and how chromophores contribute to aerosol light absorption is still sparse. To address this problem, we examined soluble independent chromophores in a set of year-round aerosol samples from Bangkok. The water-soluble fluorescent chromophores identified via excitation–emission matrix (EEM) spectroscopy and follow-up parallel factor analysis could be mainly assigned as humic-like substances and protein-like substances, which differed in their EEM pattern from that of the methanol-soluble fraction. The emission wavelength of fluorescent chromophores in environmental samples tended to increase compared with that of the primary combustion emission, which could be attributed to secondary formation or the aging process. Fluorescent indices inferred that these light-absorbing chromophores were not significantly humified and comprised a mixture of organic matter of terrestrial and microbial origin, which exhibited a different characteristic from primary biomass burning and coal-combustion results. A multiple linear regression analysis revealed that larger fluorescent chromophores that were oxygen-rich and highly aromatic with high molecular weights were the key contributors of light absorption, preferably at longer emission wavelengths (λmax⁡ > 500 nm). Positive matrix factorization analysis further suggested that up to 50 % of these responsible chromophores originated from biomass burning emissions.

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Measurement report: Long-emission-wavelength chromophores dominate the light absorption of brown carbon in aerosols over Bangkok: impact from biomass burning

et al. 2021

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Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling

Abstract: Atmospheric brown carbon (BrC) has gained attention over the past decades due to its significant impact on the radiative balance of the earth, which may cause uncertainties in global radiative forcing estimation (An-

Cited by 1 publication

References 79 publications

Measurement report: Long-emission-wavelength chromophores dominate the light absorption of brown carbon in aerosols over Bangkok: impact from biomass burning

Measurement report: Long-emission-wavelength chromophores dominate the light absorption of brown carbon in aerosols over Bangkok: impact from biomass burning

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