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Evidence of atmospheric nanoparticle formation from emissions of marine microorganisms

Sellegri, K and Pey, J and Rose, C and Culot, A and DeWitt, HL and Mas, S and Schwier, AN and Temime-Roussel, B and Charriere, B and Saiz-Lopez, A and Mahajan, AS and Parin, D and Kukui, A and Sempere, R and D'Anna, B and Marchand, N (2016) Evidence of atmospheric nanoparticle formation from emissions of marine microorganisms. Geophysical Research Letters, 43 (12). pp. 6596-6603.

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Earth, as a whole, can be considered as a living organism emitting gases and particles into its atmosphere, in order to regulate its own temperature. In particular, oceans may respond to climate change by emitting particles that ultimately will influence cloud coverage. At the global scale, a large fraction of the aerosol number concentration is formed by nucleation of gas-phase species, but this process has never been directly observed above oceans. Here we present, using semicontrolled seawater-air enclosures, evidence that nucleation may occur from marine biological emissions in the atmosphere of the open ocean. We identify iodine-containing species as major precursors for new particle clusters' formation, while questioning the role of the commonly accepted dimethyl sulfide oxidation products, in forming new particle clusters in the region investigated and within a time scale on the order of an hour. We further show that amines would sustain the new particle formation process by growing the new clusters to larger sizes. Our results suggest that iodine-containing species and amines are correlated to different biological tracers. These observations, if generalized, would call for a substantial change of modeling approaches of the sea-to-air interactions.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 08 Apr 2017 09:24
Last Modified: 08 Apr 2017 09:24

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