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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
Sprache Englisch
ISSN 1680-7316
Digitales Dokument URL
Erschienen In: Atmospheric Chemistry and Physics ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-17), S.3843-3853
Datensatznummer 250118620
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/acp-14-3843-2014.pdf
 
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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