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| Titel |
Concurrent observations of atomic iodine, molecular iodine and ultrafine particles in a coastal environment |
| VerfasserIn |
A. S. Mahajan, M. Sorribas, J. C. Gómez Martín, S. M. MacDonald, M. Gil, J. M. C. Plane, A. Saiz-Lopez |
| 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 ; 11, no. 6 ; Nr. 11, no. 6 (2011-03-17), S.2545-2555 |
| Datensatznummer |
250009506
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| Publikation (Nr.) |
 copernicus.org/acp-11-2545-2011.pdf |
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| Zusammenfassung |
| Simultaneous measurements of atomic iodine (I), molecular iodine (I2)
and ultrafine particles were made at O Grove, Galicia (42.50° N, 8.87° W),
on the northwest coast of Spain. The observations show a strong tidal
signature, and indicate that the most probable sources of reactive iodine
species are the exposed macroalgae during low tide. For the first time,
I2 and I were concurrently measured revealing a high average I2/I
ratio of ~32, which is higher than previously inferred by modelling
studies. A 1-dimensional photochemical model is employed to simulate the
observations showing that the high I2/I ratio can be reproduced in the
presence of fast vertical mixing close to the surface, or using an extra
chemical loss for I atoms with an unknown species. There is a lack of strong
correlation between the I2/I and ultrafine particles, indicating that
although they both have macroalgal sources, these were not at the same
location. The model simulations also suggest that the source of the observed
ultrafine particles is likely not very close to the measurement site, in
order for the particles to form and grow, but the source for I and I2
must be local. Finally, the effect of NOx levels on iodine oxides, and
the conditions under which iodine particle bursts will be suppressed, are
explored. |
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