Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors.

Autor: Lehtipalo K; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland.; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.; Finnish Meteorological Institute, Erik Palménin aukio 1, 00560 Helsinki, Finland., Yan C; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland., Dada L; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland., Bianchi F; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. 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Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2018 Dec 12; Vol. 4 (12), pp. eaau5363. Date of Electronic Publication: 2018 Dec 12 (Print Publication: 2018).
DOI: 10.1126/sciadv.aau5363
Abstrakt: A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. However, it is not well understood how they interact with atmospheric pollutants, such as nitrogen oxides (NO x ) and sulfur oxides (SO x ) from fossil fuel combustion, as well as ammonia (NH 3 ) from livestock and fertilizers. Here, we show how NO x suppresses particle formation, while HOMs, sulfuric acid, and NH 3 have a synergistic enhancing effect on particle formation. We postulate a novel mechanism, involving HOMs, sulfuric acid, and ammonia, which is able to closely reproduce observations of particle formation and growth in daytime boreal forest and similar environments. The findings elucidate the complex interactions between biogenic and anthropogenic vapors in the atmospheric aerosol system.
Databáze: MEDLINE