Abstract
Aerosols have a strong, yet poorly quantified, effect on climate. The growth of the smallest atmospheric particles from diameters in the nanometre range to sizes at which they may act as seeds for cloud droplets is a key step linking aerosols to clouds and climate. In many environments, atmospheric nanoparticles grow by taking up organic compounds that are derived from biogenic hydrocarbon emissions. Several mechanisms may control this uptake. Condensation of low-volatility vapours and formation of organic salts probably dominate the very first steps of growth in particles close to 1 nm in diameter. As the particles grow further, formation of organic polymers and effects related to the phase of the particle probably become increasingly important. We suggest that dependence of particle growth mechanisms on particle size needs to be investigated more systematically.
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Acknowledgements
Financial support by European Research Council Grant ATMOGAIN (project no. 278277), Vetenskapsrådet, European FP7 Integrated project PEGASOS (project number 265148), Electric Power Research Institute (EPRI), US Department of Energy (DESC0007075), US National Science Foundation (AGS1136479 and CHE1012293), and Academy of Finland (project numbers 133872 and 139656) are gratefully acknowledged. Antti-Jussi Kieloaho, Theo Kurtén, Ulla Makkonen, Spyros N. Pandis, and Mikko Äijälä are acknowledged for their valuable input in the form of useful discussions and providing experimental data.
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Riipinen, I., Yli-Juuti, T., Pierce, J. et al. The contribution of organics to atmospheric nanoparticle growth. Nature Geosci 5, 453–458 (2012). https://doi.org/10.1038/ngeo1499
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DOI: https://doi.org/10.1038/ngeo1499
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