New insights into black carbon light absorption enhancement: A comprehensive analysis of two differential behaviors DOI Creative Commons
Ruonan Fan, Yingying Ma, Wenxiang Cao

et al.

Environmental Pollution, Journal Year: 2024, Volume and Issue: 355, P. 124175 - 124175

Published: May 16, 2024

High uncertainty in optical properties of black carbon (BC) involving heterogeneous chemistry has recently attracted increasing attention the field atmospheric climatology. To fill gap BC knowledge so as to estimate more accurate climate effects and serve response global warming, it is beneficial conduct site-level studies on light absorption enhancement (Eabs) characteristics. Real-time surface gas particulate pollutant observations during summer winter over Wuhan were utilized for analysis Eabs simulated by minimum R square (MRS), considering two distinct conditions (2015 2017). In general, differences aerosol emissions led differential behaviors. The average (1.92 ± 0.55) 2015 was higher than (1.27 0.42), while (1.11 0.20) 2017 lower that (1.67 0.69) winter. RBC (representing mass ratio non-refractory constituents elemental carbon) constraints suggest increased with increase under ambient condition enriched secondary inorganic (SIA), a maximum growth rate 70.6% summer. However, demonstrated negative trend against due complicated mixing state. result arose from opposite impact hygroscopic SIA absorbing OC/irregular distributed coatings amplifying absorbency BC. Furthermore, sensitivity revealed robust positive correlation (R > 0.9) between chemical compositions (including sulfate, nitrate, ammonium organic carbon), which could be significantly perturbed only small fraction materials or restructuring through gaps filling. above findings not deepen understanding BC, but also provide useful information scientific decision-making government mitigate pollution obtain precise radiative forcing.

Language: Английский

Seasonal Trends and Site Differences of Nitroaromatic Compounds in PM2.5 in Sichuan Basin and Their Effects on Light Absorption of Brown Carbon DOI Creative Commons

Tian Tang,

Buyi Xu,

Hongli Tao

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 124 - 124

Published: Feb. 6, 2025

Nitroaromatic compounds (NACs) have adverse effects on human health and climate. Daily PM2.5 samples were collected in winter summer of 2022 two cities, Chengdu (CD) Mianyang (MY), located Sichuan Basin southwestern China. Four types NACs PM2.5, containing nitrophenols, nitrocatechols, nitrosalicylic acids, nitronaphthol, analyzed. The mean concentration a total 10 (ΣNACs) at the suburban MY site (71.7 ± 35.6 ng m−3) was higher than that urban CD (29.5 16.2 m−3), while summer, concentrations ΣNACs cities similar, around 2.2 m−3. much attributed to impact biomass burning. 4-Nitrocatechol (4NC) most abundant species during sampling period, accounting for 35–56% mass. In winter, light absorption coefficient methanol-soluble brown carbon (Abs365,M) 10.5 3.4 13.6 4.3 Mm−1 MY, respectively, which about 4–7 times summer. contributions 365 nm Abs365,M 1.6–3.6% 0.5–0.7% with 4NC contributing among all NACs. geographical origins potential sources both sites mainly distributed within basin.

Language: Английский

Citations

0
Long-Term Reconstruction of NO2 Photolysis Rate coefficients Using Machine Learning and Its Impact on Secondary Pollution: A Case Study in a Megacity of the Sichuan Basin, China DOI
Tong Li, Song Liu, Dongyang Chen

et al.

Atmospheric Pollution Research, Journal Year: 2025, Volume and Issue: unknown, P. 102526 - 102526

Published: March 1, 2025

Language: Английский

Citations

0
Chemical and Optical Distinctions Between Elemental Carbon Subcategories Char-EC and Soot-EC: Insights from a Haze Event in North China DOI
Huimin Xu, Junjie Cai, Xinxin Feng

et al.

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 126306 - 126306

Published: April 1, 2025

Language: Английский

Citations

0
New insights into black carbon light absorption enhancement: A comprehensive analysis of two differential behaviors DOI Creative Commons
Ruonan Fan, Yingying Ma, Wenxiang Cao

et al.

Environmental Pollution, Journal Year: 2024, Volume and Issue: 355, P. 124175 - 124175

Published: May 16, 2024

High uncertainty in optical properties of black carbon (BC) involving heterogeneous chemistry has recently attracted increasing attention the field atmospheric climatology. To fill gap BC knowledge so as to estimate more accurate climate effects and serve response global warming, it is beneficial conduct site-level studies on light absorption enhancement (Eabs) characteristics. Real-time surface gas particulate pollutant observations during summer winter over Wuhan were utilized for analysis Eabs simulated by minimum R square (MRS), considering two distinct conditions (2015 2017). In general, differences aerosol emissions led differential behaviors. The average (1.92 ± 0.55) 2015 was higher than (1.27 0.42), while (1.11 0.20) 2017 lower that (1.67 0.69) winter. RBC (representing mass ratio non-refractory constituents elemental carbon) constraints suggest increased with increase under ambient condition enriched secondary inorganic (SIA), a maximum growth rate 70.6% summer. However, demonstrated negative trend against due complicated mixing state. result arose from opposite impact hygroscopic SIA absorbing OC/irregular distributed coatings amplifying absorbency BC. Furthermore, sensitivity revealed robust positive correlation (R > 0.9) between chemical compositions (including sulfate, nitrate, ammonium organic carbon), which could be significantly perturbed only small fraction materials or restructuring through gaps filling. above findings not deepen understanding BC, but also provide useful information scientific decision-making government mitigate pollution obtain precise radiative forcing.

Language: Английский

Citations

3