Metrics for interpreting the microstructure of sea ice using X-ray micro-computed tomography
Metrics for interpreting the microstructure of sea ice using X-ray micro-computed tomography
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DOI：
10.1016/j.coldregions.2017.03.001
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发表时间：
2017-06
影响因子：
4.1
通讯作者：
R. Lieb-Lappen;E. Golden;R. Obbard
中科院分区：
文献类型：
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作者：
R. Lieb-Lappen;E. Golden;R. Obbard
由于海冰的特征和动态在快速变化的气候中发生变化，因此详细了解海冰的精细微观结构至关重要。 X 射线微计算机断层扫描 (μCT) 技术的进步使得能够对盐水通道形态进行非破坏性三维分析，分辨率低至几微米。在这项研究中，我们检查了从南极洲罗斯海收集的六个冰芯。制定了度量标准来描述海冰中盐水通道和气穴的形状、大小和拓扑。发现边缘尺寸为 6.0 毫米的立方子样本是使用这些指标进行海冰 μCT 分析的代表性单元体积。观察到所有样品都具有垂直定向的圆柱形盐水通道，在较低深度观察到分支和连通性增加。在中间检测到最高程度的垂直各向异性，每个岩心顶部和底部附近的变异性增加。人们发现，除了多年冰中的垂直拉长气穴外，气穴大多呈球形。
As the character and dynamics of sea ice change in a rapidly changing climate, it is critical to have a detailed understanding of the fine microstructure of sea ice. Advances in X-ray micro-computed tomography (μCT) technology have enabled non-destructive three dimensional analysis of the brine channel morphology with resolution down to several microns. In this study, we examine six ice cores collected from the Ross Sea, Antarctica. Metrics were developed to describe the shape, size, and topology of the brine channels and air pockets in sea ice. A cubic sub-sample measuring 6.0 mm on edge was found to be the representative elementary volume for sea iceμCT analysis with these metrics. All samples were observed to have vertically oriented cylindrical brine channels, with increased branching and connectivity observed at lower depths. The highest degree of vertical anisotropy was detected through the middle, with increased variability near the top and bottom of each core. Air pockets were found to be mostly spherical in shape, except vertically elongated in multi-year ice.