Direct Observations of Atmospheric Aerosol Nucleation

作者：Markku 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 P. 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 · 发表于：Science · 年份：2013 · DOI：10.1126/science.1227385 · 被引用次数：1363 · 研究领域：Atmospheric chemistry and aerosols、Atmospheric aerosols and clouds、Air Quality and Health Impacts

Atmospheric 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.