A statistical description of the microstructure of young sea ice
A statistical description of the microstructure of young sea ice
复制标题
年轻海冰微观结构的统计描述
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
A. Gow
中科院分区：
文献类型：
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作者：
D. Perovich;A. Gow
为了充分利用微波模式的海冰，标准的冰表征必须补充冰的微观结构的统计描述。对于强涨落理论，这种统计描述的形式的平均值和方差的介电常数加上相关长度。我们已经计算了50多个年轻冰样本的统计数据，包括柱状冰和淡化的泡沫冰。样品取自冰盖内不同的垂直深度和水平位置，涵盖了冰温和盐水体积的全面范围。对于这些样品中的每一个，拍摄水平薄切片，然后在基于个人计算机的图像处理系统上进行数字化和分析。结果表明，相关长度对应于夹杂物的物理尺寸：盐水袋的大小（通常为十分之一毫米）的盐冰和气泡的大小（通常为毫米）的脱盐冰。对于盐冰的相关函数的形状是椭圆形的，类似于盐水袋的形状。在一种情况下，当冰从-20 ° C升温到-1 °C，盐水体积从2 ‰增加到37‰时，相关长度从0.14 mm增加到0.22 mm。
In order to fully exploit microwave models of sea ice, the standard ice characterization must be supplemented by a statistical description of the ice microstructure. For the strong fluctuation theory this statistical description takes the form of the mean and variance of the permittivity plus correlation lengths. We have computed these statistics for over 50 samples of young ice, including both columnar congelation ice and desalinated bubbly ice. Samples were taken from different vertical depths and horizontal positions within the ice sheet and encompassed a comprehensive range of ice temperatures and brine volumes. For each of these samples, horizontal thin sections were photographed, then digitized and analyzed on a personal computer-based image processing system. Results indicate that correlation lengths correspond to the physical dimensions of the inclusions: the brine pocket size (typically tenths of a millimeter) for saline ice and the air bubble size (typically millimeters) for desalinated ice. For saline ice the shape of the correlation function was elliptical, similar to the shape of the brine pockets. In one case as the ice warmed from −20° to −1°C and the brine volume increased from 2 to 37‰, the correlation length increased from 0.14 to 0.22 mm.