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| Titel |
BrO measurements over the Eastern North-Atlantic |
| VerfasserIn |
M. Martin, D. Pöhler, K. Seitz, R. Sinreich, 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 ; 9, no. 24 ; Nr. 9, no. 24 (2009-12-21), S.9545-9554 |
| Datensatznummer |
250007806
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| Publikation (Nr.) |
 copernicus.org/acp-9-9545-2009.pdf |
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| Zusammenfassung |
The aim of the work presented here was to detect BrO in the
marine boundary layer over the Eastern North-Atlantic by Multi
AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS)
of scattered sunlight. With this technique, information about the
concentration and the vertical profile of trace gases in the
atmosphere can be gained. BrO can be formed in the marine
atmosphere by degradation of biogenic organohalogens or by oxidation
of bromide in sea salt aerosol. BrO influences the chemistry in
marine air in many ways, e.g. since it catalytically destroys ozone,
changes the NO2/NO-ratio as well as the
OH/HO2-ratio and oxidises DMS. However, the abundance
and the significance of BrO in the marine atmosphere is not
yet fully understood.
We report on data collected during a ship cruise, which took place
along the West African Coast in February 2007, within the framework of
the Surface Ocean PRocesses in the ANthropocene project
(SOPRAN). Tropospheric BrO could be detected during this cruise
at peak mixing ratios of (10.2±3.7) ppt at an assumed
layer height of 1 km on 18 February 2007. Furthermore, it was
found that the mean BrO concentrations increased when cruising
close to the African Coast suggesting that at least part of the
BrO might have originated from there. |
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