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Isoprene Forms Secondary Organic Aerosol through Cloud Processing:  Model Simulations

by: Ho-Jin Lim, Annmarie G. Carlton, Barbara J. Turpin
Environ. Sci. Technol. In Environmental Science & Technology, Vol. 39, No. 12. (12 May 2005), pp. 4441-4446, doi:10.1021/es048039h  Key: citeulike:10132610

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Abstract

Isoprene accounts for more than half of non-methane volatile organics globally. Despite extensive experimentation, homogeneous formation of secondary organic aerosol (SOA) from isoprene remains unproven. Herein, an in-cloud process is identified in which isoprene produces SOA. Interstitial oxidation of isoprene produces water-soluble aldehydes that react in cloud droplets to form organic acids. Upon cloud evaporation new organic particulate matter is formed. Cloud processing of isoprene contributes at least 1.6 Tg yr-1 to a global biogenic SOA production of 8?40 Tg yr-1. We conclude that cloud processing of isoprene is an important contributor to SOA production, altering the global distribution of hygroscopic organic aerosol and cloud condensation nuclei.


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