Journal
SCIENCE
Volume 344, Issue 6185, Pages 717-721Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1243527
Keywords
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Categories
Funding
- CERN
- European Commission Seventh Framework Programme (Marie Curie Initial Training Network CLOUD-ITN) [215072]
- European Research Council [227463]
- Academy of Finland via the Centre of Excellence program [1118615, 1133872]
- German Federal Ministry of Education and Research [01LK0902A]
- Swiss National Science Foundation [206621_125025, 206620_130527]
- Austrian Science Fund [P19546, L593]
- Portuguese Foundation for Science and Technology [CERN/FP/116387/2010]
- Russian Foundation for Basic Research [N08-02-91006-CERN]
- Davidow Foundation
- Royal Society Wolfson Award
- NSF [AGS1136479, CHE1012293]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1012293] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1136479] Funding Source: National Science Foundation
- Fundação para a Ciência e a Tecnologia [CERN/FP/116387/2010] Funding Source: FCT
- NERC [NE/G015015/1] Funding Source: UKRI
- Austrian Science Fund (FWF) [L 593] Funding Source: researchfish
- Natural Environment Research Council [NE/G015015/1] Funding Source: researchfish
- Swiss National Science Foundation (SNF) [206621_125025, 206620_130527] Funding Source: Swiss National Science Foundation (SNF)
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Atmospheric new-particle formation affects climate and is one of the least understood atmospheric aerosol processes. The complexity and variability of the atmosphere has hindered elucidation of the fundamental mechanism of new-particle formation from gaseous precursors. We show, in experiments performed with the CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN, that sulfuric acid and oxidized organic vapors at atmospheric concentrations reproduce particle nucleation rates observed in the lower atmosphere. The experiments reveal a nucleation mechanism involving the formation of clusters containing sulfuric acid and oxidized organic molecules from the very first step. Inclusion of this mechanism in a global aerosol model yields a photochemically and biologically driven seasonal cycle of particle concentrations in the continental boundary layer, in good agreement with observations.
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