Comment on egusphere-2024-2119 DOI Creative Commons

Published: Aug. 16, 2024

Abstract. Secondary organic aerosols (SOA) from highly volatile compounds (VOCs) are currently not well represented in numerical models as their heterogeneous formation mechanisms the atmosphere remain unclear. Based on smog chamber experiments, here we investigated yield and pathway of SOA acetone photooxidation presence preexisting haze particles ((NH4)2SO4, NH4HSO4) mineral dusts (Na2SO4) under ammonia-rich conditions. Our results showed that acetone-derived can be remarkably enhanced via multiphase reactions these seeds especially for dusts, suggesting VOCs is an important source atmospheric SOA. We found aerosol acidity a key factor controlling pathways SOA, which carbonyls produced dissolve into aqueous phase oligomerize consist larger molecules acidic but smaller neutral aerosols. Moreover, light absorption ability formed (NH4)2SO4 stronger than Na2SO4 mineral ammonia. yields obtained, estimated importance global atmosphere, 9.5–18.4 Tg yr-1, equivalent to 8.5–16.4 % budget, such should accounted future model studies.

Language: Английский

Variation in PM2.5 Chemical Composition During the Heating Seasons from 2018–2019 to 2020–2021 in Harbin: Response to Mitigation Strategies DOI
Qinqin Yu, Jiumeng Liu, Yuan Cheng

et al.

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Language: Английский

Citations

2
Atmospheric sulfate aerosol formation enhanced by interfacial anions DOI Creative Commons

Gehui Wang,

Si Zhang, Can Wu

et al.

PNAS Nexus, Journal Year: 2025, Volume and Issue: 4(3)

Published: Feb. 24, 2025

Heterogeneous oxidation of SO2 by NO2 on aerosols has recently been found to be one the major formation pathways sulfate in polluted troposphere, but chemical mechanisms and kinetics remain uncertain. By combining lab experiments, theoretical chemistry calculations, field measurements, here we show that is critically dependent anions at air-aerosol aqueous interface. The reaction rate with HSO3- (1.1 × 108-1.6 109 M-1 s-1) more than four orders magnitude larger traditionally held value for bulk phase due abundant occurrence chloride, nitrate, carboxylic air-aqueous interface, which remarkably accelerates during China haze periods enhancing uptake through interfacial electrostatic attraction. Atmospheric models not accounting this aerosol process likely produce misrepresentations tropospheric under conditions.

Language: Английский

Citations

2
Multiphase particle formation in industrial plumes corrects missing sulfate in the urban atmosphere DOI
Yi Su, Di Wu, Qing Li

et al.

One Earth, Journal Year: 2025, Volume and Issue: unknown, P. 101320 - 101320

Published: May 1, 2025

Language: Английский

Citations

1
Enhanced sulfate formation in mixed biomass burning and sea-salt interactions mediated by photosensitization: effects of chloride, nitrogen-containing compounds, and atmospheric aging DOI Creative Commons
Rongzhi Tang,

Jialiang Ma,

Ruifeng Zhang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(1), P. 425 - 439

Published: Jan. 13, 2025

Abstract. Discrepancies persist between modeled simulations and measured sulfate concentrations in the marine boundary layer, especially when air is influenced by biomass burning plumes. However, there has been a notable dearth of research conducted on interactions sea-salt aerosol plumes, impeding comprehensive understanding formation. This work studied formation mixing real (BB) extracts NaCl, mimicking internal mixtures BB particles. BB–NaCl particles had significantly higher rate than incense (IS)–NaCl For fresh particles, followed trend corn straw (CS)–NaCl > rice (RS)–NaCl wheat (WS)–NaCl IS–NaCl. The filter sample aging was achieved exposure to OH• generated from UV irradiation. After aging, RS–NaCl exhibited highest enhancement rates among all due RS NaCl. Bulk aqueous experiments spiked with NaCl using model photosensitizers (PSs) nitrogen-containing organic compounds (NOCs), pyrazine (CHN), 4-nitrocatechol (CHON) revealed positive effects chloride PS–CHON system negative PS–CHN Our suggests that reaching or near coastal areas can affect via photosensitizer-mediated reactions, potentially exacerbating pollution.

Language: Английский

Citations

0
Smog chamber study on the NOx dependence of SOA from isoprene photo-oxidation: implication on RO2 chemistry DOI

Xinbei Xu,

Gehui Wang,

Yining Gao

et al.

Journal of Environmental Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

Language: Английский

Citations

0
Review of health effects driven by aerosol acidity: Occurrence and implications for air pollution control DOI

Xiwen Song,

Di Wu,

Yi Su

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 955, P. 176839 - 176839

Published: Oct. 16, 2024

Language: Английский

Citations

2
Mechanistic insight into the formation of aromatic organosulfates and sulfonates through sulfoxy-radical-initiated reactions in the atmospheric aqueous phase DOI
Guochun Lv, Wenjing Yue, Zehua Wang

et al.

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 334, P. 120701 - 120701

Published: July 15, 2024

Language: Английский

Citations

1
Elucidating Decade-Long Trends and Diurnal Patterns in Aerosol Acidity in Shanghai DOI Creative Commons

Zhixiao Lv,

Xingnan Ye,

Weijie Huang

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(8), P. 1004 - 1004

Published: Aug. 20, 2024

Aerosol acidity is a critical factor affecting atmospheric chemistry. Here, we present study on annual, monthly, and daily variations in PM2.5 pH Shanghai during 2010–2020. With the effective control of SO2 emissions, NO2/SO2 ratio increased from 1.26 2010 to 5.07 2020 NO3−/SO42− 0.68 1.49. decreased 3.27 2.93 2020, regardless great achievement reducing industrial NOx emissions. These findings suggest that aerosol might not be significantly reduced response The monthly variation values exhibited V-shape trend, mainly attributable compositions temperature. Atmospheric NH3 plays decisive role buffering particle acidity, whereas Ca2+ K+ are important buffers, distinct decline 2010–2016 was associated with reduction while both temperature SO42− were drivers winter. Sensitivity tests show increases increasing relative humidity summer it sensitive winter due proportional Hair+ liquid water content (ALWC). Our results emissions will affect

Language: Английский

Citations

1
Application of Stable Isotopes in Identifying the Sources and Formation of Sulfate and Nitrate in PM2.5: A Review DOI Creative Commons
Jinfeng Peng, Cheng Chen, Shanshan Wang

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(11), P. 1312 - 1312

Published: Oct. 31, 2024

Sulfate and nitrate are important components of atmospheric PM2.5, which is the main contributor haze. Therefore, studying sources formation mechanisms sulfate very for prevention control haze formation. Stable isotopes nitrate, including isotopic compositions sulfur, oxygen, nitrogen, can be comprehensively used to study pathways in evaluate contribution each source pathway. This paper briefly reviews determination methods oxygen nitrogen focuses on application above identifying puts forward research prospects.

Language: Английский

Citations

1
Heterogeneous formation and light absorption of secondary organic aerosols from acetone photochemical reactions: remarkably enhancing effects of seeds and ammonia DOI Creative Commons
Si Zhang, Yining Gao,

Xinbei Xu

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(24), P. 14177 - 14190

Published: Dec. 19, 2024

Abstract. Secondary organic aerosols (SOAs) from highly volatile compounds (VOCs) are currently not well represented in numerical models as their heterogeneous formation mechanisms the atmosphere remain unclear. Based on smog chamber experiments, here we investigated yield and pathway of SOA acetone photochemical reactions under low-NOx conditions presence preexisting haze particles ((NH4)2SO4 NH4HSO4) saline mineral (Na2SO4) ammonia-rich conditions. Our results showed that acetone-derived is remarkably enhanced via multiphase these seeds, especially for particles. We found aerosol acidity a key factor controlling pathways SOA, which acids, alcohol, carbonyls produced dissolve into aqueous phase seeds subsequently esterify and/or oligomerize SOAs consist larger molecules acidic but smaller neutral aerosols. Moreover, light absorption ability formed (NH4)2SO4 stronger than Na2SO4 particles, ammonia, due to N-containing organics. Through comparison with methylglyoxal (MGly), total 2.8–8.2 times irreversible uptake MGly, suggesting only considering MGly precursor will probably underestimate role global production since abundantly exists troposphere.

Language: Английский

Citations

1