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| Titel |
Systematic investigation of bromine monoxide in volcanic plumes from space by using the GOME-2 instrument |
| VerfasserIn |
C. Hörmann, H. Sihler, N. Bobrowski, S. Beirle, M. Penning de Vries, U. Platt, T. Wagner |
| 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. 9 ; Nr. 13, no. 9 (2013-05-08), S.4749-4781 |
| Datensatznummer |
250018639
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| Publikation (Nr.) |
 copernicus.org/acp-13-4749-2013.pdf |
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| Zusammenfassung |
During recent years, volcanic emissions turned out to be a natural source of
bromine compounds in the atmosphere. While the initial formation process of
bromine monoxide (BrO) has been successfully studied in local ground-based
measurements at quiescent degassing volcanoes worldwide, literature on the
chemical evolution of BrO on large spatial and temporal scales is sparse. The
first space-based observation of a volcanic BrO plume following the Kasatochi
eruption in 2008 demonstrated the capability of satellite instruments to
monitor such events on a global scale.
In this study, we systematically examined GOME-2 observations from January
2007 until June 2011 for significantly enhanced BrO slant column densities
(SCDs) in the vicinity of volcanic plumes. In total, 772 plumes from at least
37 volcanoes have been found by using sulphur dioxide (SO2) as a tracer
for a volcanic plume. All captured SO2 plumes were subsequently analysed
for a simultaneous enhancement of BrO and the data were checked for a
possible spatial correlation between the two species. Additionally, the mean
BrO/SO2 ratios for all volcanic plumes have been calculated by the
application of a bivariate linear fit.
A total number of 64 volcanic plumes from at least 11 different volcanoes
showed clear evidence for BrO of volcanic origin, revealing large differences
in the BrO/SO2 ratios (ranging from some 10−5 to several 10−4)
and the spatial distribution of both species. A close correlation between
SO2 and BrO occurred only for some of the observed eruptions or just in
certain parts of the examined plumes. For other cases, only a rough spatial
relationship was found. We discuss possible explanations for the occurrence
of the different spatial SO2 and BrO distributions in aged volcanic
plumes. |
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