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We report on continuously measured 222Rn activity concentrations innear-surface air at Neumayer Station in the period 1995–2011. This17-year record showed no long-term trend and has overall mean ±standard deviation of (0.019 ± 0.012) Bq m−3. A distinct andpersistent seasonality could be distinguished with maximum values of(0.028 ± 0.013) Bq m−3 from January to March and minimumvalues of (0.015 ± 0.009) Bq m−3 from May to October.Elevated 222Rn activity concentrations were typically associated withair mass transport from the Antarctic Plateau. Our results do not support arelation between enhanced 222Rn activity concentrations at Neumayer andcyclonic activity or long-range transport from South America. The impact ofoceanic 222Rn emissions could not be properly assessed but wetentatively identified regional sea ice extent (SIE) variability as asignificant driver of the annual 222Rn cycle

On the variability of atmospheric &lt;sup&gt;222&lt;/sup&gt;Rn activity concentrations measured at Neumayer, coastal Antarctica

On the variability of atmospheric <sup>222</sup>Rn activity concentrations measured at Neumayer, coastal Antarctica