Direct observations of atmospheric aerosol nucleation.

TitleDirect observations of atmospheric aerosol nucleation.
Publication TypeJournal Article
Year of Publication2013
AuthorsKulmala M, Kontkanen J, Junninen H, Lehtipalo K, Manninen HE, Nieminen T, Petäjä T, Sipilä M, Schobesberger S, Rantala P, Franchin A, Jokinen T, Järvinen E, Äijälä M, Kangasluoma J, Hakala J, Aalto PP, Paasonen P, Mikkilä J, Vanhanen J, Aalto J, Hakola H, Makkonen U, Ruuskanen T, Mauldin RL, Duplissy J, Vehkamäki H, Bäck J, Kortelainen A, Riipinen I, Kurtén T, Johnston MV, Smith JN, Ehn M, Mentel TF, Lehtinen KEJ, Laaksonen A, Kerminen V-M, Worsnop DR
JournalScience (New York, N.Y.)
Date Published2013 Feb 22

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.

Alternate JournalScience