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| Titel |
Iodine-mediated coastal particle formation: an overview of the Reactive Halogens in the Marine Boundary Layer (RHaMBLe) Roscoff coastal study |
| VerfasserIn |
G. McFiggans, C. S. E. Bale, S. M. Ball, J. M. Beames, W. J. Bloss, L. J. Carpenter, J. Dorsey, R. Dunk, M. J. Flynn, K. L. Furneaux, M. W. Gallagher, D. E. Heard, A. M. Hollingsworth, K. Hornsby, T. Ingham, C. E. Jones, R. L. Jones, L. J. Kramer, J. M. Langridge, C. Leblanc, J.-P. LeCrane, J. D. Lee, R. J. Leigh, I. Longley, A. S. Mahajan, P. S. Monks, H. Oetjen, A. J. Orr-Ewing, J. M. C. Plane, P. Potin, A. J. L. Shillings, F. Thomas, R. Glasow, R. Wada, L. K. Whalley, J. D. Whitehead |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-29), S.2975-2999 |
| Datensatznummer |
250008269
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| Publikation (Nr.) |
 copernicus.org/acp-10-2975-2010.pdf |
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| Zusammenfassung |
This paper presents a summary of the measurements made during the
heavily-instrumented Reactive Halogens in the Marine Boundary Layer (RHaMBLe)
coastal study in Roscoff on the North West coast of France throughout
September 2006. It was clearly demonstrated that iodine-mediated coastal
particle formation occurs, driven by daytime low tide emission of molecular
iodine, I2, by macroalgal species fully or partially exposed by the
receding waterline. Ultrafine particle concentrations strongly correlate with
the rapidly recycled reactive iodine species, IO, produced at high
concentrations following photolysis of I2. The heterogeneous macroalgal
I2 sources lead to variable relative concentrations of iodine species
observed by path-integrated and in situ measurement techniques.
Apparent particle emission fluxes were associated with an enhanced apparent
depositional flux of ozone, consistent with both a direct O3 deposition to
macroalgae and involvement of O3 in iodine photochemistry and subsequent
particle formation below the measurement height. The magnitude of the
particle formation events was observed to be greatest at the lowest tides
with the highest concentrations of ultrafine particles growing to the largest
sizes, probably by the condensation of anthropogenically-formed condensable
material. At such sizes the particles should be able to act as cloud
condensation nuclei at reasonable atmospheric supersaturations. |
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