Atmospheric Environment, Journal Year: 2024, Volume and Issue: unknown, P. 120820 - 120820
Published: Sept. 1, 2024
Language: Английский
npj Climate and Atmospheric Science, Journal Year: 2025, Volume and Issue: 8(1)
Published: Feb. 25, 2025
Language: Английский
Citations
2
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 2, 2025
Hydrogen peroxide (H2O2) plays a key role in atmospheric chemistry, but knowledge of its variation, sources, and impact on sulfate formation remains incomplete, especially the urban boundary layer aloft. Here, we conducted field campaign with measurements H2O2 related species at tower-based site (∼528 m above ground surface) Beijing spring 2022. The observed hourly concentration reached up to 21.2 ppbv an average value 3.4 ± 3.7 during entire observation period, which was higher than values from previous observations throughout world. budget revealed that two known sources (self-reaction HO2 radicals ozonolysis alkenes) could not account for significant H2O2, leading considerable unknown source strength (∼0.14–0.53 h–1) noon after sunset. Based levoglucosan signal, distribution fire points, backward trajectories, biomass burning emissions southwest (e.g., North China Plain) were found contribute greatly formation. Besides, photochemical aging PM2.5 might also have potential production noon. unexpectedly high concentrations aloft made vital contribution (0.2–1.1 μg m–3 h–1), be transported surface turbulent mixing. Our findings provide improved understanding chemistry megacity, as well
Language: Английский
Citations
1
Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)
Published: May 14, 2025
Language: Английский
Citations
1
One Earth, Journal Year: 2025, Volume and Issue: unknown, P. 101320 - 101320
Published: May 1, 2025
Language: Английский
Citations
1
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 946, P. 174208 - 174208
Published: June 22, 2024
Language: Английский
Citations
4
ACS ES&T Air, Journal Year: 2025, Volume and Issue: 2(4), P. 648 - 664
Published: March 19, 2025
Aerosol nonsea-salt sulfate (NSS sulfate) forms in the atmosphere by secondary reactions of emissions from marine phytoplankton and shipping, with gas-phase as well cloud aerosol aqueous controlling production. Twelve months Atmospheric Radiation Measurements (ARM) during Eastern Pacific Cloud Precipitation Experiment (EPCAPE) at Scripps Pier La Jolla, California, showed highest NSS mass concentrations occurred for northwesterly back-trajectories over 64% year, an average 0.90 μg/m3 that contributed 76% annual concentration. Multiple Linear Regression (MLR) a refractory black carbon tracer method attributed 76-80% regionally emitted sulfur dioxide (SO2) sources submicron to biogenic 20-24% shipping emissions. MLR oxidation processes explained 21% variability Downwelling Shortwave (DSW) driving photochemical account 34% regional production, Upwind Vertical Fraction (UCVF) cloud-associated 29%, relative humidity (RH) describing aerosol-phase 36%. was correlated moderately UCVF April-June August but RH October-January. These findings show apportionment SO2 provide observational constraints mechanisms production atmosphere.
Language: Английский
Citations
0
Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(11)
Published: May 30, 2025
Abstract Despite numerous field studies focusing on the chemical composition of particulate matter, systematic investigations chloride (Cl − ) are scarce in China. This study examines spatiotemporal distribution, origin, and environmental impact Cl across China via compiling a comprehensive data set submicron aerosol (PM 1 detected by mass spectrometer (AMS). In addition, we integrated high‐time resolution from AMS at six representative sites for more detailed insights. The concentration is notably high (1.9 ± 2.7 μg m −3 comparison to global average (0.3 1.0 ), with distinguished N–S pattern (North > South) distinct seasonality (winter other seasons). Three categories diurnal variations were classified, suggesting primary combustion emission gas/particle partitioning main drivers dynamic variation . good correlation between tracers corroborates assertion that coal biomass anthropogenic sources based inventory. Furthermore, quantified impacts ammonium balances, liquid water content, hygroscopicity systematically explored. extreme cases, can enhance 100% ALWC during polluted periods, signifying its key role impacting physiochemistry aerosols. mutual promotion environment effects was also found. summary, this enhances our understanding sources, China, indicating should be considered elucidating effect fine particles.
Language: Английский
Citations
0
Atmospheric Pollution Research, Journal Year: 2024, Volume and Issue: 15(10), P. 102253 - 102253
Published: July 17, 2024
Language: Английский
Citations
2
Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(16)
Published: Aug. 14, 2024
Abstract Secondary air pollution, especially ozone (O 3 ) and secondary aerosols, are emerging quality challenges confronting China. Nitrous acid (HONO), as the predominant source of hydroxyl radicals (OH), acknowledged to be essential for pollution. However, HONO concentrations usually underestimated by current models due inadequate representations its sources. In present study, we revised Weather Research Forecasting & Chemistry (WRF‐Chem) model incorporating additional sources, including primary emissions, photo‐/dark oxidation NO x , heterogeneous uptake 2 on surfaces, nitrate photolysis. By combining in‐situ measurements in Yangtze River Delta (YRD) region, found improved show much better performance simulation is capable reproducing observed high concentrations. The source‐oriented method employed quantitatively understand relative importance various processes, which showed that ground surface was major contributor formation urban areas. Comparatively, photo‐oxidation a main rural introduction multiple sources led an apparent increase OH hydroperoxyl (HO radicals. promoted HO levels further increased diurnal O concentration 4.5–12.9 ppb, while inorganic organic were also 14%–32% during typical pollution event. description emission substantially narrowed gaps between simulations observations, highlighting great understanding numerical study.
Language: Английский
Citations
1
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 21, 2024
Clouds and fogs, consisting of tiny water droplets formed by the condensation in supersaturated air, are vital atmospheric chemistry, as they facilitate multiphase reactions. While measuring high-altitude cloud is challenging, fog ground-level clouds offer a unique opportunity for direct observation. In this study, we explored radiation fogs North China Plain using an advanced aerosol-fog sampling system to measure chemical physical properties both inactivated interstitial aerosols activated droplet residues. Our findings revealed that efficient nitrate formation primarily occurred on rather than within droplets, with observed aerosol net production rates reaching up 3.6 μg m
Language: Английский
Citations
1