Comment on egusphere-2024-1230 DOI Creative Commons
Lee Tiszenkel, James Flynn, Shan‐Hu Lee

et al.

Published: June 16, 2024

Abstract. Ammonia and amines play critical roles in secondary aerosol formation, especially urban environments. However, fast measurements of ammonia the atmosphere are very scarce. We measured with a chemical ionization mass spectrometer (CIMS) at center Houston, Texas, fourth most populated site United States, during October 2022. concentrations were on average 4 parts per billion volume (ppbv), while concentration an individual amine ranged from several trillion (pptv) to hundreds pptv. These reduced nitrogen compounds more abundant weekdays than weekends correlated CO concentrations, implying they mostly emitted pollutant sources. Both showed distinct diurnal cycle, higher warmer afternoon, indicating dominant gas-to-particle conversion processes taking place changing ambient temperatures. Studies have shown that dimethylamine is for new particle formation (NPF), but currently, there no emission inventories global climate models (as opposed ammonia). Our observations show general positively ammonia, it reasonable use scaled-down (e.g., 0.1 %) as proxy simulate NPF processes.

Language: Английский

Significant contributions of trimethylamine to sulfuric acid nucleation in polluted environments DOI Creative Commons
Runlong Cai, Rujing Yin, Xue Li

et al.

npj Climate and Atmospheric Science, Journal Year: 2023, Volume and Issue: 6(1)

Published: June 27, 2023

Abstract As one of the least understood aerosol processes, nucleation can be a dominant source atmospheric aerosols. Sulfuric acid (SA)-amine binary with dimethylamine (DMA) has been recognized as governing mechanism in polluted continental boundary layer. Here we demonstrate importance trimethylamine (TMA) for complex atmosphere and propose molecular-level SA-DMA-TMA ternary an improvement upon conventional mechanism. Using proposed mechanism, could connect gaseous amines to SA-amine cluster signals measured urban Beijing. Results show that TMA accelerate SA-DMA-based new particle formation Beijing by 50–100%. Considering global abundance DMA, our findings imply comparable DMA layer, probably higher contributions from rural environments future controlled emissions.

Language: Английский

Citations

31
Characteristics, Origins, and Atmospheric Processes of Amines in Fine Aerosol Particles in Winter in China DOI
Tang Liu, Yu Xu, Qibin Sun

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(14)

Published: July 9, 2023

Abstract Amines affect particle formation, aerosol acidity, nitrogen cycle, and climate change. However, little is known about the temporal spatial differences in composition, source, formation process of amines fine particulate matter (PM 2.5 ) different regions China. Seven (amine salts) were investigated PM collected Yangtze River Delta (YRD, Shanghai Nanjing), Pearl (PRD, Guangzhou), northern China (Xi'an Haerbin), background (Puding) areas winter 2017–2018. Methylamine was dominant amine species at YRD, China, sites, while diethylamine dominated PRD site; moreover, mass concentration fraction lowest site. These results could be attributed to changes sources atmospheric processes. Further, coal combustion biomass burning found important contributors cities winter. The contribution weakened other urban sites. In contrast, abundance site largely controlled by biogenic sources. Acid‐base chemistry displacement mechanism tightly associated with salts all particular, degradation hydroxyl radical (•OH) significant Nanjing, Guangzhou, Xi'an, Haerbin insignificant photochemical sites can explained differentiated sources, meteorological conditions, •OH levels. Overall, our findings deepen understanding origins processes amines.

Language: Английский

Citations

26
Mitigating air pollution benefits multiple sustainable development goals in China DOI
Yi Zhou, Xiuming Zhang, Chuanzhen Zhang

et al.

Environmental Pollution, Journal Year: 2024, Volume and Issue: 349, P. 123992 - 123992

Published: April 15, 2024

Language: Английский

Citations

10
Overlooked significance of iodic acid in new particle formation in the continental atmosphere DOI Creative Commons
Ning An, Jiewen Shen, Bin Zhao

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(31)

Published: July 24, 2024

New particle formation (NPF) substantially affects the global radiation balance and climate. Iodic acid (IA) is a key marine NPF driver that recently has also been detected inland. However, its impact on continental nucleation remains unclear. Here, we provide molecular-level evidence IA greatly facilitates clustering of two typical land-based nucleating precursors: dimethylamine (DMA) sulfuric (SA), thereby enhancing nucleation. Incorporating this mechanism into an atmospheric chemical transport model, show IA-induced enhancement could realize increase over 20% in SA–DMA rate iodine-rich regions China. With declining anthropogenic pollution driven by carbon neutrality clean air policies China, enhance rates 1.5 to 50 times 2060. Our results demonstrate overlooked role highlight necessity for considering synergistic SA-IA-DMA modeling correct representation climatic impacts aerosols.

Language: Английский

Citations

10
A new advance in the pollution profile, transformation process, and contribution to aerosol formation and aging of atmospheric amines DOI Creative Commons

Xinlin Shen,

Jiangyao Chen, Guiying Li

et al.

Environmental Science Atmospheres, Journal Year: 2023, Volume and Issue: 3(3), P. 444 - 473

Published: Jan. 1, 2023

Atmospheric amines from various sources undergo a variety of homogeneous and heterogeneous reactions to contribute the overall process aerosol particle formation further affect climate.

Language: Английский

Citations

20
Road Traffic Emissions Lead to Much Enhanced New Particle Formation through Increased Growth Rates DOI Creative Commons
James Brean, Alex Rowell, David C. S. Beddows

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(24), P. 10664 - 10674

Published: June 8, 2024

New particle formation (NPF) is a major source of atmospheric aerosol particles, including cloud condensation nuclei (CCN), by number globally. Previous research has highlighted that NPF less frequent but more intense at roadsides compared to urban background. Here, we closely examine both background and roadside sites in Central Europe. We show the concentration oxygenated organic molecules (OOMs) greater roadside, OOMs along with sulfuric acid onto new particles sufficient explain growth sites. identify hitherto unreported traffic-related OOM contributing 29% 16% total background, respectively. Critically, this undiscovered an essential component NPF. Without their contribution rates subsequent enhancements survival, >50 nm produced would be reduced factor 21 site. Reductions hydrocarbon emissions from road traffic may thereby reduce numbers CCN counts.

Language: Английский

Citations

7
A dynamic parameterization of sulfuric acid–dimethylamine nucleation and its application in three-dimensional modeling DOI Creative Commons
Yuyang Li,

Jiewen Shen,

Bin Zhao

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(15), P. 8789 - 8804

Published: Aug. 9, 2023

Abstract. Sulfuric acid (SA) is a governing gaseous precursor for atmospheric new particle formation (NPF), major source of global ultrafine particles, in environments studied around the world. In polluted urban atmospheres with high condensation sinks (CSs), stable SA–amine clusters, such as SA–dimethylamine (DMA) usually initializes intense NPF events. Coagulation scavenging and cluster evaporation are dominant sink processes clusters atmospheres, yet these loss not quantitatively included present parameterizations nucleation. We herein report parameterization SA–DMA nucleation, based on dynamic simulations quantum chemistry calculations, certain simplifications to greatly reduce computational costs. Compared previous nucleation parameterizations, this was able reproduce dependences rates temperature CSs. then incorporated it three-dimensional (3-D) chemical transport model simulate evolution number size distributions. Simulation results showed good consistency observations occurrence events distributions wintertime Beijing represented significant improvement compared that using without coagulation scavenging. Quantitative analysis shows contributes significantly aerosol population during 3-D (>99 % >60 %, respectively). These broaden understanding stress necessity including effects stability simulating simulations. Representing thus likely improve performance apportionment quantification air quality, human health, climate.

Language: Английский

Citations

15
Characteristics and source apportionment of water-soluble organic nitrogen (WSON) in PM2.5 in Hong Kong: With focus on amines, urea, and nitroaromatic compounds DOI

Chin Wai Leung,

Xuemei Wang, Di Hu

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 469, P. 133899 - 133899

Published: Feb. 25, 2024

Language: Английский

Citations

6
Elucidating the mechanisms of atmospheric new particle formation in the highly polluted Po Valley, Italy DOI Creative Commons
Jing Cai, Juha Sulo,

Yifang Gu

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(4), P. 2423 - 2441

Published: Feb. 26, 2024

Abstract. New particle formation (NPF) is a major source of aerosol particles and cloud condensation nuclei in the troposphere, playing an important role both air quality climate. Frequent NPF events have been observed heavily polluted urban environments, contributing to number concentration by significant amount. The Po Valley region northern Italy has characterized as hotspot for high loadings frequent southern Europe. However, mechanisms growth this are not completely understood. In study, we conducted continuous 2-month measurement campaign with state-of-the-art instruments elucidate Italy. Our results demonstrate that (66 % all days during campaign) primarily driven abundant sulfuric acid (8.5×106 cm−3) basic molecules area. contrast, oxygenated organic from atmospheric oxidation volatile compounds (VOCs) appear play minor initial cluster but contribute significantly consecutive process. Regarding alkaline molecules, amines insufficient stabilize clusters Valley. Ion measurements kinetic models suggest ammonia (10 ppb) must therefore also nucleation Generally, rates sub-2 nm (87 cm−3 s−1) nucleation-mode (5.1 h−1) well relatively low condensational sink (8.9×10-3 will result survival probability newly formed particles, making crucial springtime budget. indicate reducing key pollutants, such SO2, amine NH3, could help substantially decrease concentrations region.

Language: Английский

Citations

4
Atmospheric amines are a crucial yet missing link in Earth’s climate via airborne aerosol production DOI Creative Commons
Vijay P. Kanawade, Tuija Jokinen

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: Feb. 10, 2025

Atmospheric amines, derivatives of ammonia, play a unique yet not fully understood role in air quality, climate and public health. Sub-5 parts per trillion Volume (pptV, <10-12 volume) mixing ratios amines facilitate the physical and/or chemical transformation aerosols atmosphere, enhancing aerosol formation growth rates, hygroscopicity, activation cloud condensation nuclei. This serves as initial step for droplet and, consequently, influences properties hydrological cycle. Ambient observations demonstrate more than thousand-fold particle rates presence compared to ammonia. Yet, challenges related detecting minute levels paucity ambient amine measurements, limited process-based understanding airborne production have resulted being underrepresented global models. Therefore, advanced techniques with extremely low detection limits highly spatially temporally resolved measurements globally diverse environments are essential. Amines, ubiquitous atmospheric compounds that emitted from range natural anthropogenic sources, key activating nuclei, under-represented models require future high-precision measurement.

Language: Английский

Citations

0