Lead-210 profile in firn layer over Antarctic ice sheet and its relation to the snow accumulation environment
Lead-210 profile in firn layer over Antarctic ice sheet and its relation to the snow accumulation environment
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DOI：
10.3402/tellusb.v56i1.16403
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发表时间：
2004-01
期刊：
影响因子：
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通讯作者：
Toshitaka N. Suzuki;K. Kamiyama;T. Furukawa;Y. Fujii
中科院分区：
文献类型：
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作者：
Toshitaka N. Suzuki;K. Kamiyama;T. Furukawa;Y. Fujii
在南极洲 Dronning Maud 地东部的五个地点获得了地表雪中 210Pb 的垂直分布。理论放射性衰变曲线很好地描述了内陆高原地区的分布。另一方面，在下降风区域获得的分布具有显着的波动，包括在活动较低的层下方发现活动较高的区间。我们检验了210Pb剖面的波动与雪桩法获得的积雪率时间变化之间的关系，发现它们之间存在明显的负相关关系。这一结果表明，冰层中210Pb剖面的波动与冰盖表面的环境，即侵蚀的程度——雪的重新分布密切相关。冰盖中 210Pb 分布的测量可作为南极冰盖表面稳定性的指标。
Vertical distributions of 210Pb in surface firn were obtained at five locations in east Dronning Maud Land, Antarctica. The distributions obtained in the inland high-plateau region are well described by the theoretical radioactive decay curve. On the other hand, the distributions obtained in the katabatic wind region have significant fluctuations including intervals where higher activity is found below layers with lower activity. We examined the relationship between the fluctuation of the 210Pb profile and the temporal variation of the snow accumulation rate obtained by the snow stake method, and found a clear negative correlation between them. This result suggests that the fluctuation of the 210Pb profile in the firn layer is closely related to the environment in the ice sheet surface, i.e. the extent of erosion—redistribution of snow. The measurement of the 210Pb distribution in the ice sheet will be useful as an indicator of the surface stability in the Antarctic ice sheet.