Light Scattering by Quasi-Spherical Ice Crystals
Light Scattering by Quasi-Spherical Ice Crystals
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准球形冰晶的光散射
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
G. McFarquhar
中科院分区：
文献类型：
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作者：
T. Nousiainen;G. McFarquhar
利用大气辐射测量计划南大平原地区2000年云密集作业期间中纬度卷云中的云粒子成像仪测量的二维图像，研究了等效半径约为8~90μm、尺寸参数约为90~1 000的小的、不规则的、准球形冰晶的形状和单次散射特性。对冰晶图像进行了统计形状分析，得到了半径和相关函数随尺寸变化的相对标准差，它们共同定义了样品冰晶的形状统计。前者描述了定义给定原点的粒子表面的半径向量长度的总体变化，而后者描述了半径向量长度的相关性是它们之间角距离的函数。对数本质上是半径的自然对数。没有强烈的依赖..。
Abstract The shapes and single-scattering properties of small, irregular, quasi-spherical ice crystals, with equivalent radii between approximately 8 and 90 μm and size parameters from about 90 to 1000, are studied using two-dimensional images measured by a cloud particle imager in midlatitude cirrus during the 2000 Cloud Intensive Operation Period conducted over the Atmospheric Radiation Measurement program's Southern Great Plains site. A statistical shape analysis of the ice crystal images is carried out to obtain size-dependent relative standard deviations of radius and correlation functions of logradius, which together define the shape statistics of the sample ice crystals. The former describes the overall variation in the lengths of radius vectors defining the particle surface from a given origin, whereas the latter describes correlations of lengths of radius vectors as functions of angular distance between them. The logradius is essentially the natural logarithm of radius. There is no strong depende...