Titel
Survival of newly formed particles in haze conditions
Autor*in
Mao Xiao
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute
Birte Rörup
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki
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Abstract
Intense new particle formation events are regularly observed under highly polluted conditions, despite the high loss rates of nucleated clusters. Higher than expected cluster survival probability implies either ineffective scavenging by pre-existing particles or missing growth mechanisms. Here we present experiments performed in the CLOUD chamber at CERN showing particle formation from a mixture of anthropogenic vapours, under condensation sinks typical of haze conditions, up to 0.1 s−1. We find that new particle formation rates substantially decrease at higher concentrations of pre-existing particles, demonstrating experimentally for the first time that molecular clusters are efficiently scavenged by larger sized particles. Additionally, we demonstrate that in the presence of supersaturated gas-phase nitric acid (HNO3) and ammonia (NH3), freshly nucleated particles can grow extremely rapidly, maintaining a high particle number concentration, even in the presence of a high condensation sink. Such high growth rates may explain the high survival probability of freshly formed particles under haze conditions. We identify under what typical urban conditions HNO3 and NH3 can be expected to contribute to particle survival during haze.
Stichwort
PollutionEnvironmental ChemistryChemistry (miscellaneous)Analytical Chemistry
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1679384
Erschienen in
Titel
Environmental Science: Atmospheres
Band
2
Ausgabe
3
ISSN
2634-3606
Erscheinungsdatum
2022
Seitenanfang
491
Seitenende
499
Publication
Royal Society of Chemistry (RSC)
Fördergeber
Europäische Union (alle Programme) — 316662
Europäische Union (alle Programme) — 764991
Europäische Union (alle Programme) — 895875
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Erscheinungsdatum
2022
Zugänglichkeit
Rechte
Rechteangabe
© 2022 The Author(s)
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