 |
| Titel |
Iodine monoxide in the Antarctic snowpack |
| VerfasserIn |
U. Frieß, T. Deutschmann, B. S. Gilfedder, R. Weller, U. Platt |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 5 ; Nr. 10, no. 5 (2010-03-11), S.2439-2456 |
| Datensatznummer |
250008179
|
| Publikation (Nr.) |
 copernicus.org/acp-10-2439-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Recent ground-based and space borne observations suggest the presence of
significant amounts of iodine monoxide in the boundary layer of Antarctica,
which are expected to have an impact on the ozone budget and might contribute
to the formation of new airborne particles. So far, the source of these
iodine radicals has been unknown. This paper presents long-term measurements
of iodine monoxide at the German Antarctic research station Neumayer, which
indicate that high IO concentrations in the order of 50 ppb are present in
the snow interstitial air. The measurements have been performed using
multi-axis differential optical absorption spectroscopy (MAX-DOAS). Using a
coupled atmosphere – snowpack radiative transfer model, the comparison of the
signals observed from scattered skylight and from light reflected by the
snowpack yields several ppb of iodine monoxide in the upper layers of the
sunlit snowpack throughout the year. Snow pit samples from Neumayer Station
contain up to 700 ng/l of total iodine, representing a sufficient reservoir
for these extraordinarily high IO concentrations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|