Direct Observations of Atmospheric Aerosol Nucleation
2013; American Association for the Advancement of Science; Volume: 339; Issue: 6122 Linguagem: Inglês
10.1126/science.1227385
ISSN1095-9203
AutoresMarkku Kulmala, Jenni Kontkanen, Heikki Junninen, Katrianne Lehtipalo, Hanna E. Manninen, Tuomo Nieminen, Tuukka Petäjä, Mikko Sipilä, Siegfried Schobesberger, Pekka Rantala, Alessandro Franchin, Tuija Jokinen, Emma Järvinen, Mikko Äijälä, Juha Kangasluoma, Jani Hakala, Pasi Aalto, Pauli Paasonen, Jyri Mikkilä, Joonas Vanhanen, Juho Aalto, Hannele Hakola, Ulla Makkonen, T. M. Ruuskanen, Roy L. Mauldin, Jonathan Duplissy, Hanna Vehkamäki, Jaana Bäck, Aki Kortelainen, Ilona Riipinen, Theo Kurtén, Murray V. Johnston, James N. Smith, Mikael Ehn, Thomas F. Mentel, K. E. J. Lehtinen, Ari Laaksonen, Veli‐Matti Kerminen, Douglas R. Worsnop,
Tópico(s)Air Quality and Health Impacts
ResumoAtmospheric nucleation is the dominant source of aerosol particles in the global atmosphere and an important player in aerosol climatic effects. The key steps of this process occur in the sub-2-nanometer (nm) size range, in which direct size-segregated observations have not been possible until very recently. Here, we present detailed observations of atmospheric nanoparticles and clusters down to 1-nm mobility diameter. We identified three separate size regimes below 2-nm diameter that build up a physically, chemically, and dynamically consistent framework on atmospheric nucleation--more specifically, aerosol formation via neutral pathways. Our findings emphasize the important role of organic compounds in atmospheric aerosol formation, subsequent aerosol growth, radiative forcing and associated feedbacks between biogenic emissions, clouds, and climate.
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