Abstract
Aerosols formed and grown by gas-to-particle processes are a major contributor to smog and haze in megacities, despite the competition between growth and loss rates. Rapid growth rates from ammonium nitrate formation have the potential to sustain particle number in typical urban polluted conditions. This process requires supersaturation of gas-phase ammonia and nitric acid with respect to ammonium nitrate saturation ratios. Urban environments are inhomogeneous. In the troposphere, vertical mixing is fast, and aerosols may experience rapidly changing temperatures. In areas close to sources of pollution, gas-phase concentrations can also be highly variable. In this work we present results from nucleation experiments at −10 °C and 5 °C in the CLOUD chamber at CERN. We verify, using a kinetic model, how long supersaturation is likely to be sustained under urban conditions with temperature and concentration inhomogeneities, and the impact it may have on the particle size distribution. We show that rapid and strong temperature changes of 1 °C min−1 are needed to cause rapid growth of nanoparticles through ammonium nitrate formation. Furthermore, inhomogeneous emissions of ammonia in cities may also cause rapid growth of particles.
| Original language | English |
|---|---|
| Pages (from-to) | 265-274 |
| Number of pages | 10 |
| Journal | Environmental Science: Atmospheres |
| Volume | 4 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2024 |
| Publication type | A1 Journal article-refereed |
Funding
We thank the European Organization for Nuclear Research (CERN) for supporting CLOUD with technical and financial resources and for providing a particle beam from the CERN Proton Synchrotron. This research has received funding from the European Community (EC) Seventh Framework Programme and the European Union (EU) H2020 programme (Marie Skłodowska Curie ITN CLOUD-TRAIN grant number 316662 and CLOUD-MOTION grant number 764991); European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 895875 (“NPF-PANDA”); the Swiss National Science Foundation (no. 200021 169090, 200020 172602, 20FI20 172622, and 200021 213071); the US National Science Foundation (NSF; grant numbers AGS1801574, AGS-NUC-1801897, and AGS132089); the German Ministry of Science and Education (project CLOUD-16, 01LK1601A), ACCC Flagship funded by the Academy of Finland grant number 337549; Academy professorship funded by the Academy of Finland (grant no. 302958); Academy of Finland projects no. 325656, 316114, 314798, 325647, 341349 and 349659; “Quantifying carbon sink, CarbonSink+ and their interaction with air quality” INAR project funded by Jane and Aatos Erkko Foundation; Jenny and Antti Wihuri Foundation project “Air pollution cocktail in Gigacity”, European Research Council (ERC) project ATM-GTP Contract No. 742206; the Arena for the gap analysis of the existing Arctic Science Co-Operations (AASCO) funded by Prince Albert Foundation Contract No. 2859; and the Portuguese Science Foundation, FCT, project CERN/FIS-COM/0028/2019. This research was performed before the invasion of Ukraine by Russia on 24 February 2022.
| Funders | Funder number |
|---|---|
| AASCO | |
| Arctic Science Co-Operations | |
| CLOUD-MOTION | 764991 |
| National Science Foundation | AGS132089, AGS1801574, AGS-NUC-1801897 |
| Horizon 2020 Framework Programme | 895875 |
| Association of Community Cancer Centers | |
| European Commission | 316662 |
| European Research Council | 742206 |
| Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung | 200021 213071, 20FI20 172622, 200020 172602, 200021 169090 |
| Fundação para a Ciência e a Tecnologia | CERN/FIS-COM/0028/2019 |
| Academy of Finland | 325656, 314798, 341349, 325647, 302958, 337549, 349659, 316114 |
| Bundesministerium für Bildung und Forschung | 01LK1601A, CLOUD-16 |
| Jane ja Aatos Erkon Säätiö | |
| Jenny ja Antti Wihurin rahasto | |
| Seventh Framework Programme | |
| Prince Albert II of Monaco Foundation | 2859 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 11 Sustainable Cities and Communities
Publication forum classification
- Publication forum level 1
ASJC Scopus subject areas
- Analytical Chemistry
- Chemistry (miscellaneous)
- Environmental Chemistry
- Pollution
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