Aerosol chemical composition and sources during unexpected wintertime haze episodes in 2023 in urban Xuzhou of eastern China

Atmospheric Pollution Research, Journal Year: 2025, Volume and Issue: unknown, P. 102451 - 102451

Published: Feb. 1, 2025

Language: Английский

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Widespread surface ozone reduction triggered by dust storm disturbance on ozone production and destruction chemistry

Science Advances, Journal Year: 2025, Volume and Issue: 11(19)

Published: May 7, 2025

Natural dust storms are associated with changes to atmospheric photochemical processes, including in surface ozone, a critical global air pollutant. Here, we quantified the change ozone during for regions China by using synthesis of measurements and modeling approaches. Our results showed that notable reductions average concentration (2.0 12.2 parts per billion volume) were observed 12 storm events from 2016 2023, relative predust levels. The chemical interactions particles production processes played crucial roles explaining approximately 13 35% reduction, alongside impact intense meteorological disturbances on transport formation ozone. Among these interactions, uptake reactive nitrogen, hydroperoxyl radical could substantially contribute suppression. This study highlighted importance between severe pollution photochemistry.

Language: Английский

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A stable all-solid-state continuous-wave single-longitudinal-mode Nd:YVO4 laser at 1064 nm based on the molecular iodine absorption

Optics & Laser Technology, Journal Year: 2025, Volume and Issue: 189, P. 113124 - 113124

Published: May 9, 2025

Language: Английский

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Temporal evolution and source apportionment of BC aerosols during autumn in the grassland of Ordos, China

Meteorological Applications, Journal Year: 2024, Volume and Issue: 31(1)

Published: Jan. 1, 2024

Abstract Meteorological conditions and source emissions in grassland areas are quite different from those urban areas, which significantly impacts the spatiotemporal characteristics of black carbon (BC). To obtain BC typical environment China, continuous observations were carried out Etuoke Banner, a Ordos, September 8 to December 1, 2022. Banner autumn is 22.4–4667.5 ng m −3 , average concentration 456.6 accounting for 2.20% mass fraction PM 2.5 . liquid (BC generated combustion fuels) main component (accounting 79.2%); 361.7 The diurnal variations BC, solid bimodal, with peaks at 08:00 18:00. first peak mainly related traffic sources, cooking incomplete carbon‐containing substances; second may be caused by residential sources under influence meteorological unfavorable diffusion. variation absorption Ångström exponent (AAE) unimodal, 14:00. With increase concentration, AAE visibility gradually decreased, wind speed decreased then increased, P RH contribution biomass decreased. In contrast, increased. evolution atmospheric pollutants differed concentration. potential affecting concentrated around can affect North China Plain after 48 h transmission.

Language: Английский

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Single Droplet Tweezer Revealing the Reaction Mechanism of Mn(II)-Catalyzed SO₂ Oxidation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(11), P. 5068 - 5078

Published: March 6, 2024

Sulfate aerosol is one of the major components secondary fine particulate matter in urban haze that has crucial impacts on social economy and public health. Among atmospheric sulfate sources, Mn(II)-catalyzed SO2 oxidation surfaces been regarded as a dominating one. In this work, we measured reaction kinetics single droplets using an optical tweezer. We show occurs at Mn(II)-active sites surface, per piecewise kinetic formulation, characterized by threshold surface Mn(II) concentration gaseous concentration. When lower than value, rate first order with respect to both SO2, agreeing our traditional knowledge. But when above threshold, becomes independent concentration, greater unity. The can serve tool estimate formation based field observation, established parametrization corrects these calculations. This framework for holds promising potential generalization various heterogeneous pathways.

Language: Английский

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The dispersion of smoke haze from peatland fires over South Sumatra during the moderate El Niño of 2023

Natural Hazards, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 12, 2024

Language: Английский

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Effects of long-distance transport on O3 and secondary inorganic aerosols formation in Qingdao, China

Applied Geochemistry, Journal Year: 2023, Volume and Issue: 155, P. 105729 - 105729

Published: June 24, 2023

Language: Английский

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Hindered visibility improvement despite marked reduction in anthropogenic emissions in a megacity of southwestern China: An interplay between enhanced secondary inorganics formation and hygroscopic growth at prevailing high RH conditions

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 895, P. 165114 - 165114

Published: June 26, 2023

Language: Английский

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Characteristics of atmospheric non-methane hydrocarbon compounds (NMHCs) and their sources in urban typical secondary transformation in Beijing, China

Applied Geochemistry, Journal Year: 2023, Volume and Issue: 155, P. 105732 - 105732

Published: June 28, 2023

Language: Английский

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A Newly Established Air Pollution Data Center in China

Advances in Atmospheric Sciences, Journal Year: 2024, Volume and Issue: unknown

Published: May 3, 2024

Air pollution in China covers a large area with complex sources and formation mechanisms, making it unique place to conduct air atmospheric chemistry research. The National Natural Science Foundation of China's Major Research Plan entitled "Fundamental Researches on the Formation Response Mechanism Pollution Complex China" (or Plan) has funded 76 research projects explore causes China, key processes physics chemistry. In order summarize abundant data from exhibit long-term impacts domestically internationally, an integration project is responsible for collecting various types generated by Plan. This classified integrated these data, forming eight categories containing 258 datasets 15 technical reports total. led successful establishment Data Center (CAPDC) platform, providing storage, retrieval, download services categories. platform distinct features including visualization, related information querying, bilingual both English Chinese, which allows rapid searching downloading provides solid foundation support future control especially past decade, undeniably global exemplar, this center first focus into country's complex.

Language: Английский

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