Journal of Environmental Management, Journal Year: 2022, Volume and Issue: 315, P. 115097 - 115097
Published: April 30, 2022
Language: Английский
Geophysical Research Letters, Journal Year: 2021, Volume and Issue: 48(7)
Published: March 22, 2021
Abstract Intense and frequent new particle formation (NPF) events have been observed in polluted urban environments, yet the dominant mechanisms are still under debate. To understand key species governing processes of NPF we conducted comprehensive measurements downtown Beijing during January–March, 2018. We performed detailed analyses on sulfuric acid cluster composition budget, as well chemical physical properties oxidized organic molecules (OOMs). Our results demonstrate that fast clustering (H 2 SO 4 ) base triggered events, OOMs further helped grow newly formed particles toward climate‐ health‐relevant sizes. This synergistic role H , species, is likely representative environments where abundant usually co‐exist, with moderately low volatility when produced high NO x concentrations.
Language: Английский
Citations
151
Remote Sensing of Environment, Journal Year: 2021, Volume and Issue: 264, P. 112617 - 112617
Published: July 27, 2021
Language: Английский
Citations
111
Nature, Journal Year: 2024, Volume and Issue: 631(8019), P. 98 - 105
Published: June 12, 2024
A key challenge in aerosol pollution studies and climate change assessment is to understand how atmospheric particles are initially formed
Language: Английский
Citations
22
Remote Sensing of Environment, Journal Year: 2021, Volume and Issue: 259, P. 112410 - 112410
Published: April 8, 2021
The present study summarizes two decades (2000–2019) of climatology and trends in aerosol loading optical properties using a high spatial resolution data obtained from NASA's MODIS MAIAC MISR products supplemented by moderate OMI sensor over South Asia (SA). AOD showed good agreement against AERONET with 68.68% the retrievals falling within expected error Pearson's correlation coefficient (R = 0.83). 20 years geometric mean revealed higher aerosols Indo-Gangetic Plain (IGP) Eastern coast India 30% to 44% compared entire SA. highest under cloud-free conditions was noted during monsoon season, followed pre-monsoon, post-monsoon, winter. contribution coarse-mode (cAOD) mainly natural emission small-mode (sAOD) local anthropogenic emissions are main driver pre-monsoon seasons. Besides, presence humidity season favors hygroscopic growth particles leads values resolutions MODIS/MAIAC enabled identification previously unobserved hotspots Bihar, West Bengal, eastern Indian coastal state Odisha, which is dominated small particles. contributions smaller total were found be post-monsoon winter most states India, Nepal, Bangladesh. In contrast, coarser Pakistan Smaller predominantly retrieved mining industries, including Jharkhand Odisha. A typical dominance absorbing carbonaceous also northwestern region IGP otherwise affected mixed dust statistically significant positive temporal trend observed for whole period, SA region, influenced increase Urban/industrial weakly contributor similarly Central East states. Overall, recent advancements satellite-based potential identify constrain types across highly polluted region.
Language: Английский
Citations
100
Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(20), P. 13646 - 13656
Published: Sept. 29, 2021
Gas-phase oxygenated organic molecules (OOMs) can contribute substantially to the growth of newly formed particles. However, characteristics OOMs and their contributions particle rate are not well understood in urban areas, which have complex anthropogenic emissions atmospheric conditions. We performed long-term measurement gas-phase Beijing during 2018–2019 using nitrate-based chemical ionization mass spectrometry. OOM concentrations showed clear seasonal variations, with highest summer lowest winter. Correspondingly, calculated rates due condensation were summer, followed by spring, autumn, One prominent feature this environment was a high fraction (∼75%) nitrogen-containing OOMs. These contributed only 50–60% total led condensation, owing slightly higher volatility than non-nitrate By comparing observed rates, we that sulfuric acid its clusters main contributors sub-3 nm particles, significantly promoting 3–25 In wintertime Beijing, however, there missing particles above 3 nm, remain be further investigated.
Language: Английский
Citations
88
Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(20), P. 11747 - 11766
Published: Oct. 19, 2020
Abstract. Sulfuric acid has been shown to be a key driver for new particle formation and subsequent growth in various environments, mainly due its low volatility. However, direct measurements of gas-phase sulfuric are oftentimes not available, the current proxies cannot predict, example, nighttime concentrations or result significant discrepancies with measured values. Here, we define sources sinks different environments derive physical proxy utilized locations during periods when it is measured. We used H2SO4 from four locations: Hyytiälä, Finland; Agia Marina, Cyprus; Budapest, Hungary; Beijing, China, representing semi-pristine boreal forest, rural environment Mediterranean area, urban heavily polluted megacity, respectively. The takes into account SO2 via OH oxidation other pathways, specifically stabilized Criegee intermediates. included condensation sink (CS) atmospheric clustering starting dimer formation. Indeed, found that observed concentration can explained by proposed similar coefficients contrasting where have tested it. Thus, more flexible an important improvement over previous proxies. Following recommendations this paper, specific location derived.
Language: Английский
Citations
84
Environmental Science Atmospheres, Journal Year: 2022, Volume and Issue: 2(3), P. 352 - 361
Published: Jan. 1, 2022
We investigated the contribution of atmospheric new particle formation (NPF) and subsequent growth newly formed particles, characterized by high concentrations fine particulate matter (PM2.5). In addition to having adverse effects on visibility human health, these haze particles may act as cloud condensation nuclei, potentially large influences clouds precipitation. Using observations performed in 2019 Beijing, a polluted megacity China, we showed that variability rates (GR) originating from NPF depend only weakly low-volatile vapor - highly oxidated organic molecules (HOMs) sulphuric acid have no apparent connection with strength or level background pollution. then constrained aerosol dynamic model simulations observations. under conditions typical for Beijing atmosphere, is capable contributing more than 100 μg m-3 PM2.5 mass concentration simultaneously >103 cm-3 (diameter > nm) number concentration. Our reveal NPF, rate pre-existing population are all connected each other. Concerning PM pollution control, our results indicate reducing primary emissions might not result an effective enough decrease total until reduction precursor compounds imposed.
Language: Английский
Citations
63
Frontiers in Environmental Science, Journal Year: 2022, Volume and Issue: 10
Published: June 30, 2022
Atmospheric new particle formation (NPF) has been observed to take place in practice all around the world. In continental locations, typically about 10–40% of days are so-called NPF event characterized by a clear and growth that continue for several hours, occurring mostly during daytime. The other either non-event days, or which it is difficult decide whether had occurred not. Using measurement data from locations (Hyytiälä, Järvselja, near-city background city center Budapest), we were able show tends occur also on traditionally as days. One explanation instrument sensitivity towards low number concentrations sub-10 nm range, usually limits our capability detect such events. We found rates at 6 2–20% those traditional Growth newly formed particles very similar between This previously overlooked phenomenon, termed quiet NPF, contributes significantly production secondary atmosphere.
Language: Английский
Citations
60
Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(14), P. 9936 - 9946
Published: June 24, 2022
Atmospheric new particle formation significantly affects global climate and air quality after newly formed particles grow above ∼50 nm. In polluted urban atmospheres with 1-3 orders of magnitude higher rates than those in clean atmospheres, growth are comparable or even lower for reasons that were previously unclear. Here, we address the slow Beijing advanced measurements size-resolved molecular composition nanoparticles using thermal desorption chemical ionization mass spectrometer gas precursors nitrate CI-APi-ToF. A model combining condensational particle-phase acid-base chemistry was developed to explore mechanisms. The 8-40 nm during events is dominated by organics (∼80%) sulfate (∼13%), remainder from base compounds, nitrate, chloride. With increase sizes, fraction decreases, while slow-desorbed organics, organic acids, increases. simulated consistent measured results most cases, they both indicate vapors H2SO4 major pathway reactions play a minor role. comparison high concentrations gaseous sulfuric acid amines cause rates, concentration condensable comparably under NOx levels, relatively high-volatility nitrogen-containing oxidation products higher. insufficient lead growth, which further causes low survival environments. Thus, some extent, counteract impact on
Language: Английский
Citations
52
Nature Geoscience, Journal Year: 2023, Volume and Issue: 16(11), P. 975 - 981
Published: Oct. 12, 2023
Language: Английский
Citations
36