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| Titel |
Iodine monoxide in the Western Pacific marine boundary layer |
| VerfasserIn |
K. Grossmann, U. Frieß, E. Peters, F. Wittrock, J. Lampel, S. Yilmaz, J. Tschritter, R. Sommariva, R. Glasow, B. Quack, K. Krüger, K. Pfeilsticker, U. Platt |
| 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 ; 13, no. 6 ; Nr. 13, no. 6 (2013-03-25), S.3363-3378 |
| Datensatznummer |
250018537
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| Publikation (Nr.) |
 copernicus.org/acp-13-3363-2013.pdf |
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| Zusammenfassung |
| A latitudinal cross-section and vertical profiles of iodine monoxide
(IO) are reported from the marine boundary layer of the Western
Pacific. The measurements were taken using Multi-Axis Differential Optical
Absorption Spectroscopy (MAX-DOAS) during the TransBrom cruise of the German
research vessel Sonne, which led from Tomakomai, Japan (42° N,
141° E) through the Western Pacific to Townsville, Australia
(19° S, 146° E) in October 2009. In the marine boundary layer
within the tropics (between 20° N and 5° S), IO mixing
ratios ranged between 1 and 2.2 ppt, whereas in the subtropics and at
mid-latitudes typical IO mixing ratios were around 1 ppt in the
daytime. The profile retrieval reveals that the bulk of the IO was
located in the lower part of the marine boundary layer. Photochemical
simulations indicate that the organic iodine precursors observed during the
cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not
sufficient to explain the measured IO mixing ratios. Reasonable
agreement between measured and modelled IO can only be achieved if an
additional sea-air flux of inorganic iodine (e.g., I2) is assumed in
the model. Our observations add further evidence to previous studies that
reactive iodine is an important oxidant in the marine boundary layer. |
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