On the variability of atmospheric 222Rn activity concentrations measured at Neumayer, coastal Antarctica
Item
Title (Dublin Core)
On the variability of atmospheric 222Rn activity concentrations measured at Neumayer, coastal Antarctica
Description (Dublin Core)
We report on continuously measured <sup>222</sup>Rn 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<sup>−3</sup>. A distinct and persistent seasonality could be distinguished with maximum values of (0.028 ± 0.013) Bq m<sup>−3</sup> from January to March and minimum values of (0.015 ± 0.009) Bq m<sup>−3</sup> from May to October. Elevated <sup>222</sup>Rn activity concentrations were typically associated with air mass transport from the Antarctic Plateau. Our results do not support a relation between enhanced <sup>222</sup>Rn activity concentrations at Neumayer and cyclonic activity or long-range transport from South America. The impact of oceanic <sup>222</sup>Rn emissions could not be properly assessed but we tentatively identified regional sea ice extent (SIE) variability as a significant driver of the annual <sup>222</sup>Rn cycle.
Creator (Dublin Core)
Weller, R.
Levin, I.
Schmithüsen, D.
Nachbar, M.
Asseng, J.
Wagenbach, D.
Date (Dublin Core)
2018-09-06
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-14-3843-2014
https://acp.copernicus.org/articles/14/3843/2014/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
