Seasonal variation and source areas of airborne lead-210 at Ny-Ålesund in the High Arctic

Polar research

Yrjö Viisanen¹  Murat Buyukay¹  Juha Hatakka¹  Jussi Paatero²  Kim Holmén³ 

[1] Finnish Meteorological Institute, PO Box 503, FI-00101 Helsinki, Finland;Finnish Meteorological Institute, PO Box 503, FI-00101 Helsinki, FinlandCorrespondence;Norwegian Polar Institute, Fram Centre, NO-9296 Tromsø, Norway

关键词: High Arctic;    lead-210;    Spitsbergen;    trajectory analysis;    troposphere;   

DOI  :  10.3402/polar.v29i3.6085

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

High-volume aerosol particle samples were collected onto glass-fibre filters at Mount Zeppelin Global Atmosphere Watch station, Ny-ÅAring;lesund, Svalbard, in 2001–05. The filters were assayed for lead-210 (210Pb) by measuring the alpha particles of its in-grown daughter nuclide polonium-210 (210Po). The observed 210Pb activity concentrations at Mount Zeppelin vary between <4 and 1060 μBq m-3, with an arithmetic mean of 130 μBq m-3 and a median of 74 μBq m-3. The lowest 210Pb activity concentrations are found during summer and the highest are found in winter. This variation is caused by seasonal differences in the mixing conditions of the troposphere, the level of precipitation and the speed of atmospheric chemistry induced by solar radiation. The performed source area analysis, which is based on air mass back trajectories, indicated that in summer, 210Pb can be used as a tracer for air masses coming into contact with land areas within the past 5 days. In winter this cannot be performed because of the acc...

【 授权许可】

CC BY-NC