Source profiles of molecular structure and light absorption of PM2.5 brown carbon from residential coal combustion emission in Northwestern China

Environmental Pollution, Journal Year: 2022, Volume and Issue: 299, P. 118866 - 118866

Published: Jan. 22, 2022

Language: Английский

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A Review on Brown Carbon Aerosol in China: From Molecular Composition to Climate Impact

Current Pollution Reports, Journal Year: 2024, Volume and Issue: 10(2), P. 326 - 343

Published: Feb. 29, 2024

Language: Английский

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Factors Influencing the Molecular Compositions and Distributions of Atmospheric Nitrogen‐Containing Compounds

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(7)

Published: March 23, 2022

Abstract Atmospheric nitrogen‐containing organic compounds (NOCs) are critical components of global nitrogen deposition and light‐absorption species. The sources compositions NOCs complex remain largely unknown. Here, in 55 ambient aerosol samples collected Guangzhou, South China, were analyzed via ultrahigh‐resolution Fourier transform ion cyclotron resonance mass spectrometry negative‐ion positive‐ion electrospray ionization (ESI) modes. molecular measured ESI– ESI+ exhibited considerable differences. detected the negative mode mainly composed highly oxygenated nitrates (O/N = 6), whereas positive reduced (e.g., amides amino acids). CHN potentially corresponding to amines alkaloids showed low abundance detection Non‐metric multidimensional scaling individual compound correlation analyses that affected by anthropogenic activities meteorological parameters. For example, such as biomass burning secondary nitrogen‐chemistry processes led accumulation aromatic during winter. During summer, higher OH radical concentrations temperatures will result more prevalent or persistent aliphatic NOCs, particularly lipid‐like amines. Some variables relative humidity) have distinct effects on variation different types NOCs. More research is needed reveal influencing mechanisms. This study clarifies mechanisms which various factors influence variations. findings can guide assessment evolution deposition.

Language: Английский

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Impact of fossil and non-fossil fuel sources on the molecular compositions of water-soluble humic-like substances in PM_2.5 at a suburban site of Yangtze River Delta, China

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(14), P. 8305 - 8324

Published: July 25, 2023

Abstract. Atmospheric humic-like substances (HULIS) affect the global radiation balance due to their strong light absorption at ultraviolet wavelength. The potential sources and molecular compositions of water-soluble HULIS a suburban site in Yangtze River Delta from 2017 2018 were discussed, based on results radiocarbon (14C) analysis combining Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) technique this study. 14C showed that averaged non-fossil-fuel source contributions 39 ± 8 % 36 6 summer winter, respectively, indicating significant fossil fuel HULIS. Van Krevelen diagrams obtained FT-ICR-MS proportions tannin-like carbohydrate-like groups higher summer, suggesting contribution biogenic secondary organic aerosols (SOAs). condensed aromatic structures winter suggested increasing anthropogenic emissions. Molecular composition CHO, CHON, CHOS, CHONS subgroups relatively intensities high O-containing macromolecular oligomers CHO compounds further stronger SOA formation summer. High-intensity phenolic flavonoids, which related biomass burning polycyclic hydrocarbon (PAH) derivatives combustion emissions, found compounds. Besides, two high-intensity containing ring (C9H6O7 C10H5O8) identified samples similar those off-road engine samples, traffic emissions one important study site. CHON mainly composed nitro or organonitrates with significantly associated addition enhanced NOx winter. However, formulas referring N-heterocyclic compounds, produced atmospheric processes involving reduced N species (e.g., ammonium). S-containing organosulfates (OSs) derived precursors, namely long-chain alkane hydrocarbon, illustrate mixed Generally, different policies need be considered for each season seasonal (i.e., sources, both seasons, additional coal winter). Measures control motor vehicles industrial Additional measures power plants should applied These findings add our understanding interaction between

Language: Английский

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Organosulfur Compounds: A Non‐Negligible Component Affecting the Light Absorption of Brown Carbon During North China Haze Events

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(1)

Published: Jan. 4, 2025

Abstract The roles of organosulfur compounds (OSCs), an important component in organic matter, brown carbon (BrC) aerosol absorption is often overlooked. Here, the molecular composition OSCs and its associations with methanol‐soluble BrC (MS‐BrC) during a haze event North China were revealed using Fourier transform ion cyclotron resonance mass spectrometry analysis. By combining aggregated boosted tree model partial least squares regression estimation, our results suggested that mainly composed potential aromatic structures, MS‐BrC was closely related to OSCs. Specifically, contribute notable 26% total number upper limit 10.4% absorption. Furthermore, we found influenced by coal combustion, desulfurization reactions showed variations Since residential combustion (an primary source OSs) major energy China, research underscores as tracers for assessing impact fossil fuel on highlights atmospheric influences (e.g., light health), which need more works uncover origins, fates, environmental effects

Language: Английский

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pH modifies the oxidative potential and peroxide content of biomass burning HULIS under dark aging

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 834, P. 155365 - 155365

Published: April 21, 2022

Language: Английский

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Molecular Composition of Beijing PM_2.5 Brown Carbon Revealed by an Untargeted Approach Based on Gas Chromatography and Time-of-Flight Mass Spectrometry

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(2), P. 909 - 919

Published: Jan. 3, 2023

The knowledge of the chemical composition brown carbon (BrC) is limited to categories components or parts specific organic components. In this paper, light-absorbing properties and molecular compositions lipid-soluble in fine particulate matter Beijing from 2016 2018, characterized by an ultraviolet–visible spectrometer gas chromatography coupled with time-of-flight mass spectrometry, respectively, were combined untargetedly screen key BrC molecules a partial least squares regression model for first time. A total 421 obtained, where 61 identified qualitatively 22 quantitatively. To best our knowledge, 11 newly species. These qualitative included polycyclic aromatic hydrocarbons higher ambient concentrations absorbing efficiencies (MAEs), as well oxygen- nitrogen-containing relatively lower MAEs. absorption contribution at 365 nm quantified species during heating seasons was 39.1 ± 17.0%, which about 5 times high previous studies. results help establish complete database provide data support better evaluating climate effect atmospheric carbonaceous aerosols formulating air pollution control strategies.

Language: Английский

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Connecting oxidative potential with organic carbon molecule composition and source-specific apportionment in PM2.5 in Xi'an, China

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 306, P. 119808 - 119808

Published: April 28, 2023

Language: Английский

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Molecular signatures and formation mechanisms of water-soluble chromophores in particulate matter from Karachi in Pakistan

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169890 - 169890

Published: Jan. 6, 2024

Language: Английский

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Oxidized Nitrogen‐Containing Organic Compounds Formation Enhanced the Light Absorption of PM_2.5 Brown Carbon

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(3)

Published: Feb. 6, 2025

Abstract Brown carbon (BrC) is known to have a great impact on atmospheric radiative forcing, but its absorption characteristics at the molecular level not well understood. This study investigated seasonal variations of light and composition BrC in Xi'an, China. Results showed that exhibited higher capacity cold (autumn winter) than warm seasons (spring summer). Nitrogen‐containing organic compounds were identified as important chromophores. Oxidized‐N originated from biomass burning emissions NO x /NO 3 − mediated oxidation reactions predominant seasons, whereas reduced‐N mainly formed NH /NH 4 + abundant seasons. These results contribute better understanding formation mechanisms nitrogen‐containing chromophores PM 2.5 .

Language: Английский

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