Titanium Dioxide Promotes New Particle Formation: A Smog Chamber Study DOI
Hong Zhang, Biwu Chu, Jun Liu

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(2), P. 920 - 928

Published: Jan. 2, 2023

TiO2 is a widely used material in building coatings. Many studies have revealed that promotes the heterogeneous oxidation of SO2 and subsequent sulfate formation. However, whether how much contributes to gaseous H2SO4 new particle formation (NPF) still remains unclear. Herein, we 1 m3 quartz smog chamber investigate NPF presence TiO2. The experimental results indicated could greatly promote NPF. increases rate (J) growth due were quantified, promotion effect was attributed production H2SO4. on decreased gradually surface but did not disappear completely, instead partly recovering after washing with water. Moreover, observed regardless differences RH, most significant associated strongest occurred at an RH 20%. Based evidence, environmental impact pollution urban areas estimated.

Language: Английский

Global variability in atmospheric new particle formation mechanisms DOI Creative Commons
Bin Zhao, Neil M. Donahue, Kai Zhang

et al.

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

26
Towards understanding the characteristics of new particle formation in the Eastern Mediterranean DOI Creative Commons
Rima Baalbaki, Michael Pikridas, Tuija Jokinen

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(11), P. 9223 - 9251

Published: June 16, 2021

Abstract. To quantify the contribution of new particle formation (NPF) to ultrafine number and cloud condensation nuclei (CCN) budgets, one has understand mechanisms that govern NPF in different environments its temporal extent. Here, we study Cyprus, an Eastern Mediterranean country located at crossroads three continents affected by diverse air masses originating from continental, maritime, desert-dust source areas. We performed 1-year continuous measurements aerosol particles down ∼ 1 nm diameter for first time Middle East (EMME) region. These were complemented with trace gas data, meteorological variables, retroplume analysis. show is a very frequent phenomenon this site higher frequencies occurrence during spring autumn. events both local regional origin, occurred frequently month lowest frequency. Some exhibited multiple onsets, while others apparent shrinkage size. Additionally, observed nighttime episodes high loadings. Particle rates growth comparable those urban environments, although our rural one. Meteorological variables gases played role explaining intra-monthly variability events, but they did not explain why summer months had least Similarly, pre-existing loading seasonality. The frequency associated H2SO4 concentrations lower NO2 concentrations, which indicator anthropogenic influence. Air arriving these months, could suggest precursor vapors important nucleation are transported East. Further comprehensive required prove hypothesis.

Language: Английский

Citations

44
Estimation of sulfuric acid concentration using ambient ion composition and concentration data obtained with atmospheric pressure interface time-of-flight ion mass spectrometer DOI Creative Commons
Lisa Beck, Siegfried Schobesberger, Mikko Sipilä

et al.

Atmospheric measurement techniques, Journal Year: 2022, Volume and Issue: 15(6), P. 1957 - 1965

Published: March 31, 2022

Abstract. Sulfuric acid (H2SO4, SA) is the key compound in atmospheric new particle formation. Therefore, it crucial to observe its concentration with sensitive instrumentation, such as chemical ionisation (CI) inlets coupled pressure interface time-of-flight (APi-TOF) mass spectrometers. However, there are environmental conditions for which and physical reasons why cannot be used, example certain remote places or during flight measurements limitations regarding chemicals. Here, we propose a theoretical method estimate SA based on ambient ion composition that achieved by APi-TOF alone. We derive expression validate accurate CI-APi-TOF observations. Our validation shows developed works well daytime boreal forest (R2=0.85); however, underestimates in, e.g. Antarctic atmosphere formation events where dominating pathway nucleation involves sulfuric base (R2=0.48).

Language: Английский

Citations

30
Dust emission reduction enhanced gas-to-particle conversion of ammonia in the North China Plain DOI Creative Commons
Yongchun Liu, Junlei Zhan,

Feixue Zheng

et al.

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Nov. 12, 2022

Abstract Ammonium salt is an important component of particulate matter with aerodynamic diameter less than 2.5 µm (PM ) and has significant impacts on air quality, climate, natural ecosystems. However, a fundamental understanding the conversion kinetics from ammonia to ammonium in unique environments high aerosol loading lacking. Here, we report uptake coefficient (γ NH3 ambient PM varying 2.2 × 10 −4 6.0 North China Plain. It significantly lower those model particles under simple conditions reported literature. The probability-weighted γ increases obviously, which well explained by annual decrease pH due decline alkali earth metal contents emission source dust. Our results elaborate complex interactions between primary emissions secondary formation aerosols role dust atmospheric chemistry.

Language: Английский

Citations

30
Atmospheric nanoparticle growth DOI
Dominik Stolzenburg, Runlong Cai, Sara M. Blichner

et al.

Reviews of Modern Physics, Journal Year: 2023, Volume and Issue: 95(4)

Published: Nov. 9, 2023

Atmospheric nanoparticles can serve as nuclei for cloud droplets, thereby inducing significant but uncertain effects on the radiative forcing of climate system. This article focuses physicochemical processes that govern growth these particles from formation molecular clusters until reach sizes where they act condensation nuclei. The review describes latest developments in measurement and modeling connects domains to large-scale simulations such Earth system models. authors recommend closer coordination among laboratory studies, atmospheric measurements, understand importance

Language: Английский

Citations

23
Formation of nighttime sulfuric acid from the ozonolysis of alkenes in Beijing DOI Creative Commons

Yishuo Guo,

Chao Yan,

Chang Li

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(7), P. 5499 - 5511

Published: April 8, 2021

Abstract. Gaseous sulfuric acid (SA) has received a lot of attention for its crucial role in atmospheric new particle formation (NPF). And this reason, studies until now have mainly focused on daytime SA when most NPF events occur. While production is driven by SO2 oxidation OH radicals photochemical origin, the during nighttime and potential influence remains poorly understood. Here we present evidence significant urban Beijing winter, yielding concentrations between 1.0 3.0 × 106 cm−3. We found high frequency (∼ 30 %) events, which are defined appearance distinct peak observed 20:00 04:00 local time, with maximum concentration exceeding These mostly occurred unpolluted nights low vapor condensation sink. Furthermore, that under very clean conditions (visibility > 16.0 km) abundant ozone (concentration 2.0 1011 cm−3, ∼ 7 ppb), overall sink was strongly correlated products O3, alkenes concentrations, suggesting ozonolysis played major such conditions. This light previous showing can form stabilized Criegee intermediates (SCIs), both able to oxidize thus lead formation. However, also need point out there exist additional sources more polluted conditions, not investigated study. Moreover, strong correlation number sub-3 nm particles nights. Different from forest environments, where oxidized biogenic vapors main driver clustering, our study demonstrates cluster mode environments production.

Language: Английский

Citations

40
Chemistry of new particle formation and growth events during wintertime in suburban area of Beijing: Insights from highly polluted atmosphere DOI

Shuang-Hong Yang,

Zirui Liu, Petri Clusius

et al.

Atmospheric Research, Journal Year: 2021, Volume and Issue: 255, P. 105553 - 105553

Published: March 3, 2021

Language: Английский

Citations

34
Toward Building a Physical Proxy for Gas-Phase Sulfuric Acid Concentration Based on Its Budget Analysis in Polluted Yangtze River Delta, East China DOI Creative Commons
Liwen Yang, Wei Nie, Yuliang Liu

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(10), P. 6665 - 6676

Published: May 7, 2021

Gaseous sulfuric acid (H2SO4) is a crucial precursor for secondary aerosol formation, particularly new particle formation (NPF) that plays an essential role in the global number budget of particles and cloud condensation nuclei. Due to technology challenges, global-wide long-term measurements gaseous H2SO4 are currently very challenging. Empirical proxies have been derived mainly based on short-term intensive campaigns. In this work, we performed comprehensive related parameters polluted Yangtze River Delta East China during four seasons developed physical proxy analysis H2SO4. Besides photo-oxidation SO2, found primary emissions can contribute considerably, at night. Dry deposition has potential be non-negligible sink, addition onto surfaces. Compared with empirical proxies, newly demonstrates extraordinary stability all widely used improve understanding NPF fundamentally.

Language: Английский

Citations

34
Aerosol number concentrations and new particle formation events over a polluted megacity during the COVID-19 lockdown DOI
Shailendra Kumar Yadav, Sobhan Kumar Kompalli, Bhola Ram Gurjar

et al.

Atmospheric Environment, Journal Year: 2021, Volume and Issue: 259, P. 118526 - 118526

Published: June 5, 2021

Language: Английский

Citations

34
Influence of Aerosol Chemical Composition on Condensation Sink Efficiency and New Particle Formation in Beijing DOI Creative Commons
Wei Du, Jing Cai,

Feixue Zheng

et al.

Environmental Science & Technology Letters, Journal Year: 2022, Volume and Issue: 9(5), P. 375 - 382

Published: April 12, 2022

Relatively high concentrations of preexisting particles, acting as a condensation sink (CS) gaseous precursors, have been thought to suppress the occurrence new particle formation (NPF) in urban environments, yet NPF still occurs frequently. Here, we aim understand factors promoting and inhibiting events Beijing by combining one-year-long measurements number size distributions PM2.5 chemical composition. Our results show that indeed CS is an important factor controlling events, with its composition affecting efficiency background particles removing H2SO4 (effectiveness CS) driving NPF. During our observation period, was found be more effective for ammonium nitrate-rich (NH4NO3-rich) fine particles. On non-NPF event days, contained larger fraction NH4NO3 compared days under comparable levels. In particular, range from 0.02 0.03 s-1, nitrate 17% on 26% days. Overall, highlight importance considering when estimating their role especially environments.

Language: Английский

Citations

29