Observed Atmospheric 133Xe Concentrations in the Arctic and their relationship to the North Atlantic Oscillation (NAO). 2025

Weihua Zhang, and Mikhail Sofiev, and Chuanlei Liu, and Jing Yi, and Morten Sickel, and Jussi Paatero, and Kurt Ungar, and Eric Pellerin
Radiation Protection Bureau of Heath Canada, Canada. Electronic address: weihua.zhang@hc-sc.gc.ca.

This paper reports on 133Xe monitoring results from three Arctic stations from 2014 to 2019. The results show that the atmospheric surface monthly activity concentrations (MAC) and observation frequency (MOF) of 133Xe in Arctic winter and spring are much higher than those observed sporadically in summer. The ratios of winter to summer average MAC, which reflects the degree of seasonal variation, were 6.4, 5.2, and 3.2 for Spitsbergen, Yellowknife, and Resolute, respectively. The average of MOF ratios also showed similar trends, with a more pronounced seasonal pattern in Spitsbergen, followed by Resolute and Yellowknife. Compared with the monthly NAO index for the same period, the temporal variation patterns of 133Xe MAC at the three Arctic monitoring sites showed the highest similarity in Spitsbergen, followed by Resolute and Yellowknife. The linear regressions analysis of 133Xe MAC and MOF at these Arctic stations showed that the R2 values were highest between Resolute and Yellowknife stations (0.56 and 0.68 respectively); between Spitsbergen and Resolute stations (0.46 and 0.66 respectively); and lowest between Spitsbergen and Yellowknife (0.33 and 0.55 respectively).

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