Evaluation of long-term trend of atmospheric lead pollution in western Japan based on lead isotope ratios and Pb/Zn ratio as indicators of long-range transport of aerosols from the Asian continent

Abstract. We report on continuously measured 222Rn activity in near surface air at Neumayer Station in the period 1995 through 2011. This 17 yr 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 through March and minimum values of (0.015 ± 0.009) Bq m−3 from May through 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 SIE variability as a significant driver of the annual 222Rn cycle.

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Long-range transport of heavy metals from the Asian continent contributes to surface sediments in Lakes Shinji and Nakaumi in western Japan

Limnology ◽

10.1007/s10201-017-0517-z ◽

2017 ◽

Vol 19 (1) ◽

pp. 43-52 ◽

Cited By ~ 4

Author(s):

Kenji Kusunoki ◽

Masahiro Sakata

Keyword(s):

Heavy Metals ◽

Long Range ◽

Surface Sediments ◽

Long Range Transport ◽

Asian Continent ◽

Range Transport ◽

Western Japan

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

Atmospheric Chemistry and Physics ◽

10.5194/acp-14-3843-2014 ◽

2014 ◽

Vol 14 (8) ◽

pp. 3843-3853 ◽

Cited By ~ 9

Author(s):

R. Weller ◽

I. Levin ◽

D. Schmithüsen ◽

M. Nachbar ◽

J. Asseng ◽

...

Keyword(s):

Long Range Transport ◽

Cyclonic Activity ◽

Sea Ice Extent ◽

Near Surface ◽

Activity Concentrations ◽

Range Transport ◽

The Antarctic ◽

The Impact ◽

Long Term Trend

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.

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