First long-term surface ozone variations at an agricultural site in the North China Plain: Evolution under changing meteorology and emissions

The Science of The Total Environment, Год журнала: 2022, Номер 860, С. 160520 - 160520

Опубликована: Ноя. 25, 2022

Язык: Английский

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Measurement report: Large contribution of biomass burning and aqueous-phase processes to the wintertime secondary organic aerosol formation in Xi'an, Northwest China

Atmospheric chemistry and physics, Год журнала: 2022, Номер 22(15), С. 10139 - 10153

Опубликована: Авг. 9, 2022

Abstract. Secondary organic aerosol (SOA) plays an important role in particulate air pollution, but its formation mechanism is still not fully understood. The chemical composition of non-refractory matter with a diameter ≤2.5 µm (NR-PM2.5), OA sources, and SOA mechanisms were investigated urban Xi'an during winter 2018. fractional contribution to total mass (58 %) was larger than primary (POA, 42 %). Biomass-burning-influenced oxygenated (OOA-BB) resolved formed from the photochemical oxidation aging biomass burning (BBOA). OOA-BB more favorable on days fraction higher BBOA concentration. In comparison, aqueous-phase processed (aq-OOA) dependent secondary inorganic (SIA) content liquid water (ALWC), it showed large increase (to 50 % OA) SIA-enhanced periods. Further van Krevelen (VK) diagram analysis suggests that addition carboxylic acid groups fragmentation dominated reference days, while increased aq-OOA contributions periods likely reflect evolution due alcohol or peroxide groups.

Язык: Английский

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On the fossil and non-fossil fuel sources of carbonaceous aerosol with radiocarbon and AMS-PMF methods during winter hazy days in a rural area of North China plain

Environmental Research, Год журнала: 2022, Номер 208, С. 112672 - 112672

Опубликована: Янв. 7, 2022

Язык: Английский

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Primary Emissions and Secondary Aerosol Processing During Wintertime in Rural Area of North China Plain

Journal of Geophysical Research Atmospheres, Год журнала: 2022, Номер 127(7)

Опубликована: Март 25, 2022

Abstract The vast rural areas often experience more severe haze pollution than megacities during wintertime in North China Plain (NCP), yet the sources and evolution processes of aerosol particles, particularly organic (OA) remain poorly understood. Here we conducted real‐time measurements submicron (PM 1 ) species using a high‐resolution mass spectrometer at representative site NCP winter 2019. Our results showed dominance organics (36%) nitrate PM (22%) Positive matrix factorization analysis illustrated similarly important primary from traffic emissions, coal combustion, biomass burning, secondary OA (SOA) photochemical aqueous‐phase related processing exceeded (53% vs. 47%). Substantial decreases considerable increases sulphate were observed since 2018, demonstrating enhanced formation composition changed significantly clean period to fog events with contribution aqueous phase‐related oxygenated increasing 6% 44%, while SOA decreased correspondingly 51% 19%. size distributions also by shifting toward large sizes events. Elemental Van Krevelen diagram (H/C O/C) different roles daytime nighttime, respectively, is subject compounds high H/C O/C ratios. differences between 2018 2019 due temperatures elucidated.

Язык: Английский

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Aerosol liquid water content of PM2.5 and its influencing factors in Beijing, China

The Science of The Total Environment, Год журнала: 2022, Номер 839, С. 156342 - 156342

Опубликована: Май 29, 2022

Язык: Английский

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