A New Method for Size‐Resolved Aerosol CCN Activity Measurement at Low Supersaturation in Pristine Atmosphere DOI
Jiangchuan Tao,

Biao Luo,

Zixiang Meng

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(10)

Published: May 11, 2024

Abstract Understanding aerosol‐cloud interactions under pristine atmospheric conditions is crucial for meaningful global climate change predictions. However, ability of aerosol particles to act as cloud condensation nuclei (CCN) activity aerosols in atmosphere remains limited, mainly because the difficulty measuring it environments. Given extremely low CCN number concentration supersaturations (SSs) and complex impact kinetic limitation measurements, size‐resolved measurements at SSs cannot be achieved with traditional methods using differential mobility analyzers a counter (CCNC) sample efficiency multiple charges. To overcome this difficulty, we propose new method concentrations. The based on combined system comprising an aerodynamic classifier (AAC) CCNC (AAC‐CCNC system). A control program was developed achieve high‐resolution scans SS particle size within reasonable time frame. data inversion scheme, including corrections transfer function limitation, obtain accurate activity. In July‐August 2022, used measure Tibetan Plateau. This can advance thereby enhancing our understanding atmosphere.

Language: Английский

New particle formation dynamics in the central Andes: contrasting urban and mountaintop environments DOI Creative Commons
Diego Aliaga, Victoria A. Sinclair, Radovan Krejčí

et al.

Aerosol Research, Journal Year: 2025, Volume and Issue: 3(1), P. 15 - 44

Published: Jan. 14, 2025

Abstract. In this study, we investigate atmospheric new particle formation (NPF) across 65 d in the Bolivian central Andes at two locations: mountaintop Chacaltaya station (CHC, 5.2 km above sea level) and an urban site El Alto–La Paz (EAC), 19 apart 1.1 lower altitude. We classified days into four categories based on intensity of NPF, determined by daily maximum concentration 4–7 nm particles: (1) high both sites, (2) medium both, (3) EAC but low CHC, (4) both. These were then named after their emergent most prominent characteristics: Intense-NPF, Polluted, Volcanic, Cloudy. This classification was premised assumption that similar NPF intensities imply processes. Our findings show significant differences terms size volume, sulfuric acid concentration, aerosol compositions, pollution levels, meteorological conditions, air mass origins. Specifically, intense events increased Aitken mode concentrations (14–100 nm) significantly 28 % when masses passed over Altiplano. At larger (40–100 from × 103 cm−3 (background) to 6.2 cm−3, is very likely linked ongoing process. High levels emissions 24 found interrupt growth CHC diminish nucleation EAC. Meanwhile, 14 days, sulfate large volumes observed, correlating with influences originating actively degassing Sabancaya volcano a depletion positive 2–4 ions not During these reduced observed Lastly, 34 overcast conditions associated rates lowlands east stations. all cases, event initiation (∼ 09:00 LT) generally occurred about half hour earlier than modulated solar cycle. dawn representative regional residual layer minimal local surface influence due barren landscape. As day progresses, upslope winds bring affected altitudes, which may include anthropogenic or biogenic sources. develops gradually, eventually creating right for start. EAC, start rapid boundary layer, favored entrainment above. The study highlights role modifying particles underscores varying impacts versus mountain top environments processes Andean region.

Language: Английский

Citations

0
Elucidating particle number concentrations and unveiling source mechanisms at a prominent national background site on the northeastern Qinghai-Tibetan Plateau DOI
Zeyu Gao, Fei Wang, Wei Du

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 969, P. 178928 - 178928

Published: Feb. 27, 2025

Language: Английский

Citations

0
Organic aerosols in the inland Tibetan Plateau: New insights from molecular tracers DOI
Xin Wan, Pingqing Fu, Shichang Kang

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 884, P. 163797 - 163797

Published: April 29, 2023

Language: Английский

Citations

3
Key characteristics of new particle formation events occurring simultaneously in the Yangtze River Delta and northeast rural sites in China DOI
Shuo Liu, Peng Wang, Qianli Ma

et al.

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 324, P. 120406 - 120406

Published: Feb. 22, 2024

Language: Английский

Citations

0
Impact of Anthropogenic Aerosol Transport on Cloud Condensation Nuclei Activity During Summertime in Qilian Mountain, in the Northern Tibetan Plateau DOI
Jianzhong Xu, Fan Mei, X. H. Zhang

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(9)

Published: May 6, 2024

Abstract In this study, we conducted field campaigns at two mountain‐top observatories on the Qilian Mountains (QLM) in northeastern Tibetan Plateau of China, which plays a vital role sustaining water resources for downstream arid and semi‐arid regions. The observatories, Waliguan Baseline Observatory (WLG) Laohugou station (LHG), are situated eastern western edge QLM, respectively. objectives study were to examine properties atmospheric aerosols, CCN concentrations ( N ) varying supersaturation levels (SS = 0.2%–1.0%), hygroscopic nature aerosols especially during formation orographic cloud. Notably, average aerosol concentration was approximately 2–3 factors higher WLG compared LHG. chemical compositions primarily dominated by sulfate organic (OA) these sites. A very high hygroscopicity parameter calculated using composition observed sites (0.37 ± 0.03 LHG vs. 0.30 0.04 WLG). Enhanced loading episodes impacted anthropogenic emission Exploration high‐loading cases each site, found that activity size, but processes cloud could also be important activity, low SS conditions. These findings collectively underscore significant impact air plumes QLM their potential influence precipitation patterns.

Language: Английский

Citations

0
A New Method for Size‐Resolved Aerosol CCN Activity Measurement at Low Supersaturation in Pristine Atmosphere DOI
Jiangchuan Tao,

Biao Luo,

Zixiang Meng

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(10)

Published: May 11, 2024

Abstract Understanding aerosol‐cloud interactions under pristine atmospheric conditions is crucial for meaningful global climate change predictions. However, ability of aerosol particles to act as cloud condensation nuclei (CCN) activity aerosols in atmosphere remains limited, mainly because the difficulty measuring it environments. Given extremely low CCN number concentration supersaturations (SSs) and complex impact kinetic limitation measurements, size‐resolved measurements at SSs cannot be achieved with traditional methods using differential mobility analyzers a counter (CCNC) sample efficiency multiple charges. To overcome this difficulty, we propose new method concentrations. The based on combined system comprising an aerodynamic classifier (AAC) CCNC (AAC‐CCNC system). A control program was developed achieve high‐resolution scans SS particle size within reasonable time frame. data inversion scheme, including corrections transfer function limitation, obtain accurate activity. In July‐August 2022, used measure Tibetan Plateau. This can advance thereby enhancing our understanding atmosphere.

Language: Английский

Citations

0