Imaging brine and air inclusions in sea ice using micro-X-ray computed tomography
Imaging brine and air inclusions in sea ice using micro-X-ray computed tomography
复制标题
使用微型 X 射线计算机断层扫描对海冰中的盐水和空气包裹体进行成像
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
I. Baker
中科院分区：
文献类型：
--
作者：
R. Obbard;G. Troderman;I. Baker
海冰是由冰、盐析出物、液态卤水和气泡组成的三相系统。其异质性既影响其物理性质(声学、电学和光学)，也影响其对极地生态系统的生物和运输过程以及对全球气候的贡献。因此，海冰的内部结构长期以来一直是科学界感兴趣的问题。虽然X射线计算机层析成像技术早在1988年就已被使用(Kawamura，1988,1990)，但主要是使用光学方法来检查二维的孔隙度和卤水网络(例如，Light等人，2003年)。然而，最近，微型X射线计算机断层摄影术(Micro-CT)的进步使得能够在更精细的尺度上对这些特征进行三维(3-D)的无损检查(Golden等人，2007)。这一发展使得利用掺入氯化铯的海冰单晶进行X射线对比的渗流理论取得了进展(Golden等人，2007年；Pringle等人，2009年)。我们最近开发了一种方法，使用SkyScan1172高分辨率微型CT，在天然多晶海冰中产生单独的盐水和空气的3-D图像。这一结果使人们有可能分别或同时观察和测量卤水和空气中的空隙，并将进一步发现海冰的性质。
Sea ice is a three-phase system consisting of ice, salt precipitates, liquid brine, and gas bubbles. Its heterogeneity affects both its physical properties (acoustic, electrical and optical) and its contributions to the biological and transport processes in the polar ecosystem and to global climate. Therefore the internal structure of sea ice has long been of interest to the scientific community. Primarily, optical methods have been used to examine porosity and brine networks in two dimensions (e.g. Light and others, 2003), although X-ray computed tomography was used as early as 1988 (Kawamura, 1988, 1990). Recently, however, advances in micro-X-ray computed tomography (micro-CT) have enabled the non-destructive examination of these features in three dimensions (3-D) on a much finer scale (Golden and others, 2007). This development has permitted advances in percolation theory using single crystals of sea ice doped with CsCl for X-ray contrast (Golden and others, 2007; Pringle and others, 2009). We have recently developed a method to produce separate 3-D images of brine and air in natural polycrystalline sea ice using a SkyScan 1172 high-resolution micro-CT. The results make it possible to visualize and measure brineand air-filled voids separately and together, and will lead to further discoveries of sea-ice properties.