The Characteristics of the Chemical Composition of PM2.5 during a Severe Haze Episode in Suzhou, China DOI Creative Commons

Xiangpeng Huang,

Yu‐Sheng Chen, Yue’e Li

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(10), P. 1204 - 1204

Published: Oct. 9, 2024

During the past decade, air quality has been greatly improved in China since implementation of “Clean Air Act”. However, haze events are still being reported some regions China, and pollution mechanism remains unclear. In this study, we investigate chemical characteristics PM2.5 composition Suzhou from October 18 to December 15, 2020. A notable declining trend temperature was observed 27 November, which indicates seasonal transition fall winter season. Four representative periods were identified based on meteorological parameters mass concentrations. The heavy period had typical a relatively low temperature, high relative humidity, loadings atmospheric pollutants; nitrate dominant contributor during period. formation driven by planetary boundary layer dynamics. potential source contribution function model (PSCF) showed that major originated northwest direction sampling site. aerosol liquid water content presented increasing trends with an humidity. pH highest period, influenced NO3−, SO42−, NH4+, Cl−. comprehensive analysis paper could improve our understanding environmental effects region.

Language: Английский

Characterization of brown carbon absorption in different European environments through source contribution analysis DOI Creative Commons
Héctor Navarro-Barboza, Jordi Rovira, Vincenzo Obiso

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(4), P. 2667 - 2694

Published: Feb. 28, 2025

Abstract. Brown carbon (BrC) is a fraction of organic aerosol (OA) that absorbs radiation in the ultraviolet and short visible wavelengths. Its contribution to radiative forcing uncertain due limited knowledge its imaginary refractive index (k). This study investigates variability k for OA from wildfires, residential, shipping, traffic emission sources over Europe. The Multiscale Online Nonhydrostatic Atmosphere Chemistry (MONARCH) model simulated concentrations source contributions, feeding an offline optical tool constrain values at 370 nm. was evaluated against mass chemical speciation monitors (ACSMs) filter sample measurements, as well light absorption measurements nm derived Aethalometer™ 12 sites across Results show MONARCH captures temporal environments (regional, suburban, urban background). Residential emissions are major colder months, while secondary (SOA) dominates warmer periods. Traffic minor primary contributor. Biomass coal combustion significantly influence absorption, with shipping also notable near harbors. Optimizing revealed significant influenced by environmental conditions. Derived biomass burning (0.03 0.13), residential (0.008 (0.005 0.08), 0.07) improved representation compared constant k. Introducing such source-specific constraints innovative approach enhance atmospheric models.

Language: Английский

Citations

1
Chemical Diversity of Organosulfur Species in Various Atmospheric Environments Over the Guanzhong Basin of Northwest China DOI Creative Commons
Xin Zhang, Lijuan Li, Yue Lin

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(7)

Published: March 28, 2025

Abstract Atmospheric organosulfur species (OrgS) were investigated at four different sites (urban, rural, forest, and remote mountain) in the Guanzhong basin of northwest China to probe their chemical diversity distribution profiles. The organic molecular composition ambient PM 2.5 samples was measured using an ultrahigh performance liquid chromatograph coupled with electrospray ionization Orbitrap high‐resolution mass spectrometer. We found that OrgS (including CHOS CHONS herein) ubiquitously present across these environments predominated number assigned negative mode. fractions (mean 41%–45%) total over upper range compared those worldwide areas (12%–37%), primarily attributing high levels anthropogenic pollutants (SO 2 , NO x sulfate, etc.) this region. Organosulfates nitrooxy‐organosulfates aliphatic‐like structures from long‐chain alkanes biogenic precursors constituted a majority OrgS, yet distinct characteristics each environment. carbon atoms molecules revealed mainly originated complex mixed sources urban site, whereas more prevalent non‐urban sites. production resulted synergistic interactions multiple influencing factors conditions. Our results highlight importance pollution modifying aerosol under various atmospheric environments.

Language: Английский

Citations

0
Long-term evolution of carbonaceous aerosols in PM2.5 during over a decade of atmospheric pollution outbreaks and control in polluted central China DOI Creative Commons
Zhe Dong, Xiao Li,

Zhangsen Dong

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 935, P. 173089 - 173089

Published: May 10, 2024

Against the backdrop of an uncertain evolution carbonaceous aerosols in polluted areas over long term amid air pollution control measures, this 11-year study (2011-2021) investigated fine particulate matter (PM

Language: Английский

Citations

2
Comparison of Gaseous and Particulate Highly Oxygenated Organic Molecules from the Ozonolysis of Terpenes DOI Creative Commons
Jian Zhao,

Valter Mickwitz,

Jiangyi Zhang

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 28, 2024

Language: Английский

Citations

0
The Characteristics of the Chemical Composition of PM2.5 during a Severe Haze Episode in Suzhou, China DOI Creative Commons

Xiangpeng Huang,

Yu‐Sheng Chen, Yue’e Li

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(10), P. 1204 - 1204

Published: Oct. 9, 2024

During the past decade, air quality has been greatly improved in China since implementation of “Clean Air Act”. However, haze events are still being reported some regions China, and pollution mechanism remains unclear. In this study, we investigate chemical characteristics PM2.5 composition Suzhou from October 18 to December 15, 2020. A notable declining trend temperature was observed 27 November, which indicates seasonal transition fall winter season. Four representative periods were identified based on meteorological parameters mass concentrations. The heavy period had typical a relatively low temperature, high relative humidity, loadings atmospheric pollutants; nitrate dominant contributor during period. formation driven by planetary boundary layer dynamics. potential source contribution function model (PSCF) showed that major originated northwest direction sampling site. aerosol liquid water content presented increasing trends with an humidity. pH highest period, influenced NO3−, SO42−, NH4+, Cl−. comprehensive analysis paper could improve our understanding environmental effects region.

Language: Английский

Citations

0