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| Titel |
Simultaneous satellite observations of IO and BrO over Antarctica |
| VerfasserIn |
A. Schönhardt, M. Begoin, A. Richter, F. Wittrock, L. Kaleschke, J. C. Gómez Martín, J. P. Burrows |
| 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 ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-25), S.6565-6580 |
| Datensatznummer |
250011344
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| Publikation (Nr.) |
 copernicus.org/acp-12-6565-2012.pdf |
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| Zusammenfassung |
This article reports on satellite observations of iodine
monoxide (IO) and bromine monoxide (BrO). The region of
interest is Antarctica in the time between spring and
autumn. Both molecules, IO and BrO, are reactive halogen
species and strongly influence tropospheric composition. As
a result, a better understanding of their spatial distribution
and temporal evolution is necessary to assess accurately their
role in tropospheric chemistry. Especially in the case of IO,
information on its present magnitude, spatial distribution
patterns and source regions is still sparse.
The present study is based on six years of SCIAMACHY (SCanning
Imaging Absorption spectroMeter for Atmospheric CartograpHY)
data recorded in nadir viewing geometry. Multi-year averages
of monthly mean IO columns are presented and compared to the
distributions of BrO. Influences of the IO air mass factor and
the IO absorption cross section temperature dependence on the
absolute vertical columns are discussed. The long-term
observations of IO and BrO columns yield new insight into the
temporal and spatial variation of IO above the Antarctic
region. The occurrence of IO on Antarctic sea ice in late
spring (November) is discovered and presented. In addition,
the comparison between IO and BrO distributions show many
differences, which argues for different mechanisms and
individual nature of the release of the two halogen oxide
precursors. The state of the ecosystem, in particular the
changing condition of the sea ice in late spring, is used to
explain the observations of the IO behaviour over Antarctica
and the differences between IO and BrO distributions. |
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