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New particle formation has been estimated to produce around half of cloud-forming particles in the present-day atmosphere, via gas-to-particle conversion. Here we assess the importance of new particle formation (NPF) for both the present-day and the preindustrial atmospheres. We use a global aerosol model with parametrizations of NPF from previously published CLOUD chamber experiments involving sulfuric acid, ammonia, organic molecules, and ions. We find that NPF produces around 67% of cloud condensation nuclei at 0.2% supersaturation (CCN0.2%) at the level of low clouds in the preindustrial atmosphere (estimated uncertainty range 45–84%) and 54% in the present day (estimated uncertainty range 38–66%). Concerning causes, we find that the importance of biogenic volatile organic compounds (BVOCs) in NPF and CCN formation is greater than previously thought. Removing BVOCs and hence all secondary organic aerosol from our model reduces low-cloud-level CCN concentrations at 0.2% supersaturation by 26% in the present-day atmosphere and 41% in the preindustrial. Around three quarters of this reduction is due to the tiny fraction of the oxidation products of BVOCs that have sufficiently low volatility to be involved in NPF and early growth. Furthermore, we estimate that 40% of preindustrial CCN0.2% are formed via ion-induced NPF, compared with 27% in the present day, although we caution that the ion-induced fraction of NPF involving BVOCs is poorly measured at present. Our model suggests that the effect of changes in cosmic ray intensity on CCN is small and unlikely to be comparable to the effect of large variations in natural primary aerosol emissions.

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Caltech Authors  


Gordon, Hamish -  Kirkby, Jasper -  Baltensperger, Urs -  Bianchi, Federico -  Breitenlechner, Martin -  Curtius, Joachim -  Dias, Antonio -  Dommen, Josef -  Donahue, Neil M. -  Dunne, Eimear M. -  Duplissy, Jonathan -  Ehrhart, Sebastian -  Flagan, Richard C. -  Frege, Carla -  Fuchs, Claudia -  Hansel, Armin -  Hoyle, Christopher R. -  Kulmala, Markku -  Kürten, Andreas -  Lehtipalo, Katrianne -  Makhmutov, Vladimir -  Molteni, Ugo -  Rissanen, Matti P. -  Stozkhov, Yuri -  Tröstl, Jasmin -  Tsagkogeorgas, Georgios -  Wagner, Robert -  Williamson, Christina -  Wimmer, Daniela -  Winkler, Paul M. -  Yan, Chao -  Carslaw, Ken S. - 

Id.: 70747505

Versión: 1.0

Estado: Final

Tipo:  application/pdf -  application/pdf - 

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  application/pdf -  application/pdf - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20171214-151053041
[References] https://authors.library.caltech.edu/83929/

Fecha de contribución: 16-dic-2017


* Gordon, Hamish and Kirkby, Jasper and Baltensperger, Urs and Bianchi, Federico and Breitenlechner, Martin and Curtius, Joachim and Dias, Antonio and Dommen, Josef and Donahue, Neil M. and Dunne, Eimear M. and Duplissy, Jonathan and Ehrhart, Sebastian and Flagan, Richard C. and Frege, Carla and Fuchs, Claudia and Hansel, Armin and Hoyle, Christopher R. and Kulmala, Markku and Kürten, Andreas and Lehtipalo, Katrianne and Makhmutov, Vladimir and Molteni, Ugo and Rissanen, Matti P. and Stozkhov, Yuri and Tröstl, Jasmin and Tsagkogeorgas, Georgios and Wagner, Robert and Williamson, Christina and Wimmer, Daniela and Winkler, Paul M. and Yan, Chao and Carslaw, Ken S. (2017) Causes and importance of new particle formation in the present-day and preindustrial atmospheres. Journal of Geophysical Research. Atmospheres, 122 (16). pp. 8739-8760. ISSN 2169-897X. http://resolver.caltech.edu/CaltechAUTHORS:20171214-151053041

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