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| Titel |
Impact of reactive bromine chemistry in the troposphere |
| VerfasserIn |
R. Glasow, R. Kuhlmann, M. G. Lawrence, U. Platt, P. J. Crutzen  |
| 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 ; 4, no. 11/12 ; Nr. 4, no. 11/12 (2004-12-08), S.2481-2497 |
| Datensatznummer |
250001425
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| Publikation (Nr.) |
 copernicus.org/acp-4-2481-2004.pdf |
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| Zusammenfassung |
| Recently several field campaigns and satellite observations have found
strong indications for the presence of bromine oxide (BrO) in
the free troposphere. Using a global atmospheric chemistry transport
model we show that BrO mixing ratios of a few tenths to 2 pmol mol-1 lead to a reduction in the zonal mean O3 mixing
ratio of up to 18% in widespread areas and regionally up to 40%
compared to a model run without bromine chemistry. A lower limit
approach for the marine boundary layer, that does not explicitly
include the release of halogens from sea salt aerosol, shows that for
dimethyl sulfide (DMS) the effect is even larger, with up to
60% reduction of its tropospheric column. This is accompanied by
dramatic changes in DMS oxidation pathways, reducing its cooling
effect on climate. In addition there are changes in the HO2:OH ratio that also affect NOx and PAN. These
results imply that potentially significant strong sinks for O3
and DMS have so far been ignored in many studies of the
chemistry of the troposphere. |
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