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On the variability of atmospheric 222Rn activity concentrations measured at Neumayer, coastal Antarctica

Abstract. 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 b...

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Hauptverfasser: Weller, Rolf (VerfasserIn) , Levin, Ingeborg (VerfasserIn) , Schmithüsen, Dominik (VerfasserIn) , Nachbar, Mario (VerfasserIn) , Asseng, J. (VerfasserIn) , Wagenbach, Dietmar (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 April 2014
In: Atmospheric chemistry and physics
Year: 2014, Jahrgang: 14, Heft: 8, Pages: 3843-3853
ISSN:1680-7324
DOI:https://doi.org/10.5194/acp-14-3843-2014
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/https://doi.org/10.5194/acp-14-3843-2014
Verlag, lizenzpflichtig, Volltext: https://acp.copernicus.org/articles/14/3843/2014/
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Verfasserangaben:R. Weller, I. Levin, D. Schmithüsen, M. Nachbar, J. Asseng, and D. Wagenbach
Beschreibung
Zusammenfassung:Abstract. 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.>
Beschreibung:Im Titel ist "222" hochgestellt
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Beschreibung:Online Resource
ISSN:1680-7324
DOI:https://doi.org/10.5194/acp-14-3843-2014

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