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Rapid growth of new atmospheric particles by nitric acid and ammonia condensation

Wang, M.; Kong, W.; Marten, R.; He, X.-C.; Chen, D.; Pfeifer, J.; Heitto, A.; Kontkanen, J.; Dada, L.; Kürten, A.; Yli-Juuti, T.; Manninen, H. E.; Amanatidis, S.; Amorim, A.; Baalbaki, R.; Baccarini, A.; Bell, D. M.; Bertozzi, B.; Bräkling, S.; Brilke, S.; ... mehr

New-particle formation is a major contributor to urban smog$^{1,2}$, but how it occurs in cities is often puzzling$^{3}$. If the growth rates of urban particles are similar to those found in cleaner environments (1–10 nanometres per hour), then existing understanding suggests that new urban particles should be rapidly scavenged by the high concentration of pre-existing particles. Here we show, through experiments performed under atmospheric conditions in the CLOUD chamber at CERN, that below about +5 degrees Celsius, nitric acid and ammonia vapours can condense onto freshly nucleated particles as small as a few nanometres in diameter. Moreover, when it is cold enough (below −15 degrees Celsius), nitric acid and ammonia can nucleate directly through an acid–base stabilization mechanism to form ammonium nitrate particles. Given that these vapours are often one thousand times more abundant than sulfuric acid, the resulting particle growth rates can be extremely high, reaching well above 100 nanometres per hour. However, these high growth rates require the gas-particle ammonium nitrate system to be out of equilibrium in order to sustain gas-phase supersaturations. ... mehr

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DOI: 10.1038/s41586-020-2270-4
Zitationen: 1
Web of Science
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0028-0836, 1476-4687
KITopen-ID: 1000119882
Erschienen in Nature <London>
Band 581
Heft 7807
Seiten 184-189
Vorab online veröffentlicht am 13.05.2020
Nachgewiesen in Scopus
Web of Science
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