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| Titel |
On the variability of atmospheric ²²²Rn activity concentrations measured at Neumayer, coastal Antarctica |
| VerfasserIn |
R. Weller, I. Levin, D. Schmithüsen, M. Nachbar, J. Asseng, D. Wagenbach |
| 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 ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-17), S.3843-3853 |
| Datensatznummer |
250118620
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| Publikation (Nr.) |
 copernicus.org/acp-14-3843-2014.pdf |
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| Zusammenfassung |
| We report on continuously measured 222Rn activity concentrations in
near-surface air at Neumayer Station in the period 1995–2011. This
17-year record showed no long-term trend and has overall mean ±
standard deviation of (0.019 ± 0.012) Bq m−3. A distinct and
persistent seasonality could be distinguished with maximum values of
(0.028 ± 0.013) Bq m−3 from January to March and minimum
values of (0.015 ± 0.009) Bq m−3 from May to October.
Elevated 222Rn activity concentrations were typically associated with
air mass transport from the Antarctic Plateau. Our results do not support a
relation between enhanced 222Rn activity concentrations at Neumayer and
cyclonic activity or long-range transport from South America. The impact of
oceanic 222Rn emissions could not be properly assessed but we
tentatively identified regional sea ice extent (SIE) variability as a
significant driver of the annual 222Rn cycle. |
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