On the variation of ice pellet characteristics
On the variation of ice pellet characteristics
复制标题
关于冰粒特性的变化
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
W. Henson
中科院分区：
文献类型：
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作者：
Steven R. Gibson;R. Stewart;W. Henson
[1]冰球是一种重要但研究较少的冬季降水类型。为了更好地记录和理解这种类型的降水，在蒙特利尔地区的三次冬季风暴期间，用高分辨率数码相机对冰球颗粒进行了成像。颗粒特征，尺寸分布，降水率，和参数化的颗粒尺寸分布的图像分析和事件之间的比较。这些事件之间有许多相似之处，包括：存在相同的颗粒类别，总体粒度分布非常相似，最常见的颗粒直径（0.6 mm）相同。针状体相对于其基本粒子的相对长度在三个事件中也被发现是相似的，确定了以下关系：针状体长度= 0.45 ·粒子大小。此外，大量的时间变化（下至5分钟），观察到的颗粒大小和沉淀率。此外，即使在低沉淀速率（0.5 mm/h）下也观察到一定范围的颗粒尺寸。事件之间的差异包括不同类别的相对数量和时间变化的程度。这项研究证实，冰粒的特征说明了至少三个事件的许多共同特征，尽管也存在重要的差异。
[1] Ice pellets are an important yet little-studied type of winter precipitation. To better document and understand this type of precipitation, ice pellet particles were imaged with a high-resolution digital camera during three winter storms in the Montreal area. Particle characteristics, size distributions, precipitation rates, and parameterizations of the particle size distributions were determined from the analysis of the images and compared between events. There were many similarities between the events, and these include the following: The same particle classes were present, the overall size distributions were very similar, and the most common particle diameter (0.6 mm) was the same. The relative lengths of spicules with respect to their base particles were also found to be similar among the three events, with the following relationship being determined: spicule length = 0.45 · particle size. In addition, substantial temporal variability (down to 5 min) was observed in both the particle sizes and the precipitation rate. Also, a range of particle sizes was observed even at low precipitation rates (0.5 mm/h). Differences between the events included the relative numbers of the different classes and the degree of temporal variability. This study confirmed that ice pellet characteristics illustrate many common features in at least three events, although important differences exist as well.