TY - JOUR
T1 - Insights into dissolved organics in non-urban areas - Optical properties and sources
AU - Yu, Feng
AU - Li, Xiaofei
AU - Zhang, Rui
AU - Guo, Jingning
AU - Yang, Wen
AU - Tripathee, Lekhendra
AU - Liu, Lang
AU - Wang, Yuqin
AU - Kang, Shichang
AU - Cao, Junji
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/7/15
Y1 - 2023/7/15
N2 - Brown carbon aerosols show obvious light absorption properties in the ultraviolet–visible (UV–Vis) range, which has an important impact on photochemistry and climate. In this study, experimental samples originated from the North slope of the Qinling Mountains (at two remote suburb sites) to study the optical properties of water-soluble brown carbon (WS–BrC) in PM2.5. The WS-BrC of TY (a sampling site on the edge of Tangyu of Mei county) has a stronger light absorption ability than CH (a rural sampling site, near the Cuihua Mountains scenic spot). The direct radiation effect of WS-BrC relative to elemental carbon (EC) is 6.67 ± 1.36% in TY and 24.13 ± 10.84% in CH in the UV range, respectively. In addition, two humic-like and one protein-like fluorophore components in WS-BrC were identified by fluorescence spectrum and parallel factor (EEMs-PARAFAC). Humification index (HIX), biological index (BIX) and fluorescence index (FI) together showed that the WS-BrC in the two sites may originate from fresh aerosol emissions. Potential source analysis of Positive Matrix Factorization (PMF) model show that the combustion process, vehicle, secondary formation and road dust are the main contributors to WS-BrC.
AB - Brown carbon aerosols show obvious light absorption properties in the ultraviolet–visible (UV–Vis) range, which has an important impact on photochemistry and climate. In this study, experimental samples originated from the North slope of the Qinling Mountains (at two remote suburb sites) to study the optical properties of water-soluble brown carbon (WS–BrC) in PM2.5. The WS-BrC of TY (a sampling site on the edge of Tangyu of Mei county) has a stronger light absorption ability than CH (a rural sampling site, near the Cuihua Mountains scenic spot). The direct radiation effect of WS-BrC relative to elemental carbon (EC) is 6.67 ± 1.36% in TY and 24.13 ± 10.84% in CH in the UV range, respectively. In addition, two humic-like and one protein-like fluorophore components in WS-BrC were identified by fluorescence spectrum and parallel factor (EEMs-PARAFAC). Humification index (HIX), biological index (BIX) and fluorescence index (FI) together showed that the WS-BrC in the two sites may originate from fresh aerosol emissions. Potential source analysis of Positive Matrix Factorization (PMF) model show that the combustion process, vehicle, secondary formation and road dust are the main contributors to WS-BrC.
KW - Fluorescence components
KW - Optical properties
KW - Qinling mountains
KW - Source resolution
KW - Water-soluble brown carbon
UR - https://www.scopus.com/pages/publications/85153473717
U2 - 10.1016/j.envpol.2023.121641
DO - 10.1016/j.envpol.2023.121641
M3 - 文章
C2 - 37100371
AN - SCOPUS:85153473717
SN - 0269-7491
VL - 329
JO - Environmental Pollution
JF - Environmental Pollution
M1 - 121641
ER -
可持续发展目标 13 气候行动