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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Aerial observations of floe size distribution in the marginal ice zone of summer Prydz Bay
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Aerial observations of floe size distribution in the marginal ice zone of summer Prydz Bay

机译：夏季普里兹湾边缘冰区的絮凝物粒径分布的空中观测

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On the basis of aerial photographs of sea ice floes in the marginal ice zone (MIZ) of Prydz Bay acquired from December 2004 to February 2005 during the 21st Chinese National Antarctic Research Expedition, image processing techniques are employed to extract some geometric parameters of floes from two merged transects covering the whole MIZ. Variations of these parameters with the distance into the MIZ are then obtained. Different parameters of floe size, namely area, perimeter, and mean caliper diameter (MCD), follow three similar stages of increasing, flat and increasing again, with distance from the open ocean. Floe shape parameters (roundness and the ratio of perimeter to MCD), however, have less significant variations than that of floe size. Then, to modify the deviation of the cumulative floe size distribution from the ideal power law, an upper truncated power-law function and a Weibull function are used, and four calculated parameters of the above functions are found to be important descriptors of the evolution of floe size distribution in the MIZ. Among them, L r of the upper truncated power-law function indicates the upper limit of floe size and roughly equals the maximum floe size in each square sample area. L 0 in the Weibull distribution shows an increasing proportion of larger floes in squares farther from the open ocean and roughly equals the mean floe size. D in the upper truncated power-law function is closely associated with the degree of confinement during ice breakup. Its decrease with the distance into MIZ indicates the weakening of confinement conditions on floes owing to wave attenuation. The γ of the Weibull distribution characterizes the degree of homogeneity in a data set. It also decreases with distance into MIZ, implying that floe size distributes increase in range. Finally, a statistical test on floe size is performed to divide the whole MIZ into three distinct zones made up of floes of quite different characteristics. This zonal structure of floe size also agrees well with the trends of floe shape and floe size distribution, and is believed to be a straightforward result of wave-ice interaction in the MIZ.
机译：根据2004年12月至2005年2月在第21届中国南极研究探险队期间获得的普里兹湾边缘冰区（MIZ）海浮冰的航拍照片，采用图像处理技术从中提取浮冰的一些几何参数两个合并的样条覆盖了整个MIZ。然后获得这些参数随进入MIZ的距离的变化。絮凝物大小的不同参数，即面积，周长和平均卡尺直径（MCD），遵循三个相似的阶段，即随着距远洋的距离增加，变平和再次增加。但是，絮状物的形状参数（圆度和周长与MCD的比率）的变化不如絮状物的大小显着。然后，为了修正累积絮凝物粒度分布与理想幂律的偏差，使用了上截断的幂律函数和韦布尔函数，发现上述函数的四个计算参数是该函数演化的重要描述符。 MIZ中的絮凝物大小分布。其中，上截断幂律函数的L r表示絮凝物尺寸的上限，并且大致等于每个正方形样本区域中的最大絮凝物尺寸。威布尔分布中的L 0表示离远洋较远的正方形中较大的絮凝物所占的比例增加，并且大致等于平均絮凝物的大小。上截断的幂律函数中的D与碎冰过程中的约束程度紧密相关。它随着到MIZ距离的增加而减小，这表明由于波浪衰减，絮凝物的约束条件减弱了。威布尔分布的γ表示数据集中的均匀程度。它也随着到MIZ的距离而减小，这意味着絮凝物的大小分布范围增加。最后，对絮凝物的大小进行统计检验，将整个MIZ分为三个由特性完全不同的絮凝物组成的不同区域。絮状物尺寸的这种带状结构也与絮状物形状和絮状物尺寸分布的趋势非常吻合，并且被认为是MIZ中海冰相互作用的直接结果。

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