Radiogenic isotope fingerprint of Wilkes Land–Adélie Coast Bottom Water in the circum‐Antarctic Ocean
Radiogenic isotope fingerprint of Wilkes Land–Adélie Coast Bottom Water in the circum‐Antarctic Ocean
复制标题
环南极洋威尔克斯地-阿德利海岸底水的放射性同位素指纹
DOI：
10.1029/2006gl026020
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发表时间：
2006
影响因子：
5.2
通讯作者：
W. Abouchami
中科院分区：
文献类型：
--
作者：
T. van de Flierdt;S. Hemming;S. Goldstein;W. Abouchami
Wilkes land - ad<s:1>海岸底部水域包括在Prydz湾以东和罗斯海以西（90°E - 150°E）的东南极洲海岸周围形成的底部水域。在这里，我们表明这些底水不仅具有特征的物理性质，而且还携带着独特的放射性同位素信号，可以追踪它们的扩散。环南极锰铁结核的Nd、Hf和Pb同位素组成记录了周围海水的同位素组成。Nd和Hf同位素比值最低，Pb同位素比值最高的是来自澳大利亚-南极盆地深处，它们是Wilkes land - adaclilie海岸底水的特征。这些数据说明了这些同位素系统作为环南极地区和其他地方现在和过去的深水和底水的示踪剂的潜在价值。
Wilkes Land–Adélie Coast Bottom Water encompasses the bottom waters formed around the coast of East Antarctica in the area east of Prydz Bay and west of the Ross Sea (90°E–150°E). Here we show that these bottom waters have not only characteristic physical properties, but also carry a distinct radiogenic isotope signal that traces their dispersal. The Nd, Hf and Pb isotopic compositions of Circum‐Antarctic ferromanganese nodules record the isotopic composition of ambient seawater. Those with the lowest Nd and Hf isotopic ratios and the highest Pb isotopic ratios are from the deep Australian‐Antarctic Basin, and they fingerprint Wilkes Land–Adélie Coast Bottom Water. The data illustrate the potential value of these isotope systems as tracers of present and past deep and bottom waters in the Circum‐Antarctic realm and elsewhere.