Light Absorption Properties of Brown Carbon Aerosol During Winter at a Polluted Rural Site in the North China Plain DOI Creative Commons

Yanan Tao,

Zheng Yang,

Xinyu Tan

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(11), P. 1294 - 1294

Published: Oct. 28, 2024

Brown carbon aerosols (BrC), a subfraction of organic aerosols, significantly influence the atmospheric environment, climate and human health. The North China Plain (NCP) is hotspot for BrC research in China, yet our understanding optical properties rural regions still very limited. In this study, we characterize chemical components light absorption at site during winter NCP. average mass concentration PM1 135.1 ± 82.3 μg/m3; organics nitrate are main PM1. coefficient (babs,BrC) 53.6 45.7 Mm−1, accounting 39.5 10.2% total 370 nm. Diurnal variations reveal that babs,BrC lower afternoon, attributed to evolution planetary boundary layers. mainly emitted locally, both aqueous phase photooxidation reactions can increase babs,BrC. Notably, reduced when RH > 65%. During foggy conditions, facilitate formation secondary contribute bleaching BrC. This process ultimately causes decrease Ångström exponent (AAE) efficiency (MAE). contrast, babs,BrC, along with AAE MAE, rise due substantial primary emissions. study enhances polluted

Language: Английский

Molecular insights into the composition, sources, and aging of atmospheric brown carbon DOI Creative Commons
Alexander Laskin, Christopher P. West, Anusha P. S. Hettiyadura

et al.

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The light-absorbing chemical components of atmospheric organic aerosols are commonly referred to as Brown Carbon (BrC), reflecting the characteristic yellowish brown appearance aerosol.

Language: Английский

Citations

4
Insight into the Role of NH3/NH4+ and NOx/NO3– in the Formation of Nitrogen-Containing Brown Carbon in Chinese Megacities DOI

Diwei Wang,

Zhenxing Shen, Xueting Yang

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 23, 2024

Particulate brown carbon (BrC) plays a crucial role in the global radiative balance due to its ability absorb light. However, effect of molecular formation on light absorption properties BrC remains poorly understood. In this study, atmospheric samples collected from six Chinese megacities winter and summer were characterized through ultrahigh-performance liquid chromatography coupled with Orbitrap mass spectrometry (UHPLC-Orbitrap MS) measurements. The average values coefficient at wavelength 365 nm (babs365) approximately 4.0 times higher than those summer. Nitrogen-containing organic molecules (CHNO) identified as critical components light-absorbing substances both seasons, underscoring importance N-addition BrC. These nitrogen-containing chromophores more closely related nitro-containing compounds originating biomass burning nitrogen oxides (NOx)/nitrate (NO3–) reactions winter. summer, they reduced N-containing formed ammonia (NH3)/ammonium (NH4+) reactions. NH3/NH4+-mediated contributed secondary winter, particularly southern cities. Compared O/Cw, lower molecule conjugation indicator (double bond equivalent, DBE), babs365 suggest possible bleaching mechanism during oxidation process. findings strengthen connection between composition BrC, providing insights into mechanisms across northern cities different seasons.

Language: Английский

Citations

10
Key toxic components and sources affecting oxidative potential of atmospheric particulate matter using interpretable machine learning: Insights from fog episodes DOI
Ruiyu Li, Caiqing Yan,

Qingpeng Meng

et al.

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 465, P. 133175 - 133175

Published: Dec. 7, 2023

Language: Английский

Citations

24
Sources, Variations, and Effects on Air Quality of Atmospheric Ammonia DOI
Ziru Lan, Weili Lin, Gang Zhao

et al.

Current Pollution Reports, Journal Year: 2024, Volume and Issue: 10(1), P. 40 - 53

Published: Jan. 19, 2024

Language: Английский

Citations

8
The critical role of aqueous-phase processes in aromatic-derived nitrogen-containing organic aerosol formation in cities with different energy consumption patterns DOI Creative Commons
Yi-Jia Ma, Yu Xu, Ting Yang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 2763 - 2780

Published: March 4, 2025

Abstract. Nitrogen-containing organic compounds (NOCs) impact air quality and human health. Here, the abundance, potential precursors, main formation mechanisms of NOCs in PM2.5 during winter were compared for first time among Haerbin (dependent on coal heating), Beijing (natural gas as heating energy), Hangzhou (no centralized policy). The total signal intensity CHON+, CHN+, CHON− was highest lowest Hangzhou. Anthropogenic aromatics accounted 73 %–93 % all identified precursors Haerbin. Although abundance aromatic-derived lower than Haerbin, also contributors to NOC Beijing. exhibited levels aromatic precursors. Furthermore, non-metric multidimensional scaling analysis indicated an overall reduction fossil fuel combustion pollution along route from We found that aqueous-phase processes (mainly condensation, hydrolysis, or dehydration reduced mainly oxidization hydrolysis oxidized NOCs) can promote transformation produce NOCs, leading most significant increase (particularly haze days). Reduced precursor emissions (the lowest) constrained NOCs. results suggest aerosol coal-dependent cities is controlled by anthropogenic processes. Thus, without effective emission controls, through may still pose a large threat quality.

Language: Английский

Citations

1
Bubble Turbulent Gas-Permeable Membrane for Ammonia Recovery from Swine Wastewater: Mass Transfer Enhancement and Antifouling Mechanisms DOI
Dongqing Liu, Wenhui Wang, Dongmei Liu

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(13), P. 6019 - 6029

Published: March 21, 2024

Recovering ammonium from swine wastewater employing a gas-permeable membrane (GM) has potential but suffers the limitations of unattractive mass transfer and poor-tolerance antifouling properties. Turbulence is an effective approach to enhancing release volatile ammonia while relying on interfacial disturbance interfere with contaminant adhesion. Herein, we design innovative coupled bubble turbulence (BT-GM) that enhances mitigating fouling. Bubbles act as carriers accelerate migration liquid phase, increasing concentration gradient at membrane–liquid interface. In comparison, rate BT-GM process applied real 38% higher than conventional GM (12 h). Through computational fluid dynamics simulation, kinetic energy system 3 orders magnitude GM, area nearly times GM. Seven batches tests confirmed exhibits remarkable ability, broadens its adaptability complex water quality, practically promotes development sustainable resource recycling.

Language: Английский

Citations

5
Seasonal changes in water-soluble brown carbon (BrC) at Nanling background station in South China DOI Creative Commons
Bolong Zhang, Jiao Tang, Xiaofei Geng

et al.

Frontiers in Environmental Science, Journal Year: 2024, Volume and Issue: 12

Published: Feb. 14, 2024

Brown carbon (BrC) is an important light-absorbing component of organic (OC), causing large uncertainty in aerosol radiative forcing evaluation and being related to health issues as well. Knowledge BrC atmospheric background station beneficial understand its role a changing climate. A year-long sampling campaign was conducted at Nanling get comprehensive knowledge WS-BrC, total seventy-two PM 2.5 samples throughout year were used. Light absorption fluorescence spectra WSOC analyzed synchronously using spectrophotometer. The low levels , OC, elemental (EC) conferred site. optical properties WS-BrC characterized excitation-emission matrix (EEM) spectroscopy. made significant contribution (365 nm, 18% ± 10%) carbonaceous absorption. mass efficiency (MAE) 0.81 0.34 m 2 gC –1 varies among seasons due the different sources or processing. Three EEM fluorescent components identified by parallel factor (PAFAFAC) analysis, including two humic-like substances (HULIS, C1, C2), one phenolic-like component. HULIS accounted for approximately 70% intensities. Primary combustion emissions showed enhanced activity during winter spring seasons, but there no influences on spring. Secondary contributed significantly winter, summer, autumn (all exceeding 50%), except Photooxidation process formation secondary autumn, may be another pathway i.e., ammonia pathway. This study contributes our understanding atmosphere.

Language: Английский

Citations

4
Different formation pathways of nitrogen-containing organic compounds in aerosols and fog water in northern China DOI Creative Commons
Wei Sun, Xiao Hu,

Yuzhen Fu

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(12), P. 6987 - 6999

Published: June 18, 2024

Abstract. While aqueous-phase processing is known to contribute the formation of nitrogen-containing organic compounds (NOCs), specific pathways involved remain poorly understood. In this study, we aimed characterize NOCs present in both pre-fog aerosols and fog water collected at a suburban site northern China. Fourier-transform ion cyclotron resonance mass spectrometry was utilized analyze molecular composition negative positive modes electrospray ionization (ESI− ESI+). samples, constituted significant portion, accounting for over 60 % all assigned formulas ESI− more than 80 ESI+. By comparing originating from biomass burning, coal combustion, vehicle emissions, identified that 72.3 were attributed primary anthropogenic sources (pNOCs), while remaining categorized as secondary formed within (saNOCs). Unique found classified (sfNOCs). Through comprehensive “precursor–product pair” screening involving 39 reaction pathways, observed nitration reaction, amine pathway, intramolecular N-heterocycle pathway NH3 addition reactions contributed 43.6 %, 22.1 11.6 saNOCs, respectively. contrast, these 26.8 28.4 29.7 sfNOCs, This disparity likely influenced by diverse precursors, aqueous acidity, gas-phase species partitioning. Correspondingly, saNOCs contain higher abundance carbohydrate-like highly oxygenated with two nitrogen atoms compared pNOCs. Conversely, sfNOCs exhibited content lipid-like fewer oxygen atoms. These results underscore distinct processes contributing diversity water, which may lead their different climate effects.

Language: Английский

Citations

4
Atmospheric Brown Carbon: Sources, Optical Properties, and Chromophore Composition DOI Creative Commons

Ashmeet Kaur Alang,

Shankar G. Aggarwal

Aerosol and Air Quality Research, Journal Year: 2024, Volume and Issue: 24(9), P. 240035 - 240035

Published: Jan. 1, 2024

Brown carbon (BrC) constitutes a significant portion of organic (OC) and exerts substantial influence on air quality, atmospheric chemical processes, the impact climate dynamics. The intricate chemistry BrC arises from multiple mechanisms source types, yielding wide spectrum spectral properties. Consequently, identifying representative chromophore species to develop reference material is crucial capture full diversity found in atmosphere ensure its precise monitoring. This also emphasizes need for more comprehensive measurement method link BrC's optical traits with composition. One objectives this review evaluate existing level understanding concerning molecular compositions compounds by analyzing recent field laboratory data. paper revises expands part prior database containing critical assessments primary secondary sources, photochemistry multi-phase reactions involving BrC, potential candidate chromophores, studies properties cryosphere, draw lessons advances that lead improved representation atmosphere.

Language: Английский

Citations

3
The capacity of human interventions to regulate PM2.5 concentration has substantially improved in China DOI Creative Commons

Jiachen Meng,

Wenchao Han,

Cheng Yuan

et al.

Environment International, Journal Year: 2025, Volume and Issue: 195, P. 109251 - 109251

Published: Jan. 1, 2025

The rapid urbanization in China has brought about serious air pollution problems, which are likely to persist for a considerable period as the process continues. In urban areas, spatial distribution of pollutants represented by PM

Language: Английский

Citations

0