Improvement in Determination of Ice Water Content from Two-Dimensional Particle Imagery. Part II: Applications to Collected Data
Improvement in Determination of Ice Water Content from Two-Dimensional Particle Imagery. Part II: Applications to Collected Data
复制标题
二维粒子图像测定冰水含量的改进。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
B. Baker
中科院分区：
文献类型：
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作者：
R. Lawson;B. Baker
在这个由两部分组成的系列的第一部分中，根据拍摄的冰粒和融化的水滴的扩展数据集，推导出了冰粒质量M的新关系式。这种新的关系式使M的均方根误差降低了近50%。本文将从二维粒子图像计算颗粒质量和冰水含量的新关系式与以前文献中使用的其他关系式进行了比较。将新旧关系应用于在自然云中收集的数据时的比较表明，根据颗粒大小和形状的不同，使用旧关系的结果与新关系的差异高达3倍。如果每个图像(即投影区域)中遮挡像素的数量可用，则可以将新关系之一应用于二维图像的现有(存档)数据集。
In Part I of this two-part series, a new relationship for ice particle mass M was derived based on an expanded dataset of photographed ice particles and melted drops. The new relationship resulted in a reduction of nearly 50% in the rms error in M. In this paper, new relationships for computing particle mass and ice water content from 2D particle imagery are compared with other relationships previously used in the literature. Comparison of the old and new relationships, when applied to data collected in natural clouds, shows that results using the old relationships differ from the new relationships by up to a factor of 3, depending on particle size and shape. One of the new relationships can be applied to existing (archived) datasets of two-dimensional images, provided that the number of occulted pixels in each image (i.e., projected area) is available.