Core-scale radioscopic imaging: a new method reveals density-calcium link in Antarctic firn
Core-scale radioscopic imaging: a new method reveals density-calcium link in Antarctic firn
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核心尺度射线成像：一种新方法揭示了南极冰雪中的密度与钙的联系
DOI：
10.3189/2013jog13j028
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发表时间：
2013
影响因子：
3.4
通讯作者：
T. Laepple
中科院分区：
文献类型：
--
作者：
J. Freitag;S. Kipfstuhl;T. Laepple
抽象的。发展了一种新的射线成像技术来测量积雪密度。
前所未有的分辨率和精度，即使在孔隙率较低或岩心或岩块的几何形状时也是如此
的核心是不完美的。这项技术是基于X射线微焦点计算机断层摄影术(ICE-CT)
专为冰芯应用而设计。应用于南极降雪岩芯B32的档案
1998年在Dronning Maud Land进行钻探，所获得的密度剖面显示出与
以前在格陵兰岛发现的钙离子浓度。给出了杂质-密度关系
之前在格陵兰岛发现的，我们的结果表明新密度的准确性提高了
测量结果和格陵兰岛上类似震级的杂质-密度关系
南极高原。我们的测量提供了第一个证据，证明杂质-密度关系是
极地降雪的普遍特征和钙离子浓度可以作为描述
定量地研究了杂质对致密化的影响。
ABSTRACT. A new radioscopic imaging technique has been developed to measure firn density in
unprecedented resolution and accuracy even when the porosity is low or the geometry of a core or piece
of core is not perfect. The technique is based on an X-ray microfocus computer tomograph (ICE-CT)
designed especially for ice-core applications. Applied on an archive piece of the Antarctic firn core B32
drilled in Dronning Maud Land in 1998, the obtained density profile shows a strong correlation with the
calcium ion concentration as found previously in Greenland. Given the impurity–density relationship
found previously in Greenland, our result suggests both improved accuracy of the new density
measurements and an impurity–density relationship with a similar magnitude in Greenland to that on
the Antarctic plateau. Our measurements provide first evidence that the impurity–density relationship is
a universal feature of polar firn and that the calcium ion concentration can serve as a proxy to describe
quantitatively the effect of the impurities on densification.