On the Relative Efficiency of Coalescence and Riming
On the Relative Efficiency of Coalescence and Riming
复制标题
关于聚结和沸腾的相对效率
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
David B. Johnson
中科院分区：
文献类型：
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作者：
David B. Johnson
摘要本文比较了由凝聚生长的未冻结雨滴和由凝聚生长的霰和冻结雨滴的云气增长率。结果表明，在云滴较大的地区（例如，20 μm直径）。在这种情况下，通过降低的体积密度（至少降低到0.2 g cm-3或更低），的增长率也会得到提高。然而，当遇到更小的云滴时，粒子的明显优势就消失了，有时甚至会逆转。
Abstract Riming growth rates for graupel and frozen raindrops are compared with those of unfrozen drops growing by coalescence. The results indicate that graupel can have a considerable advantage over unfrozen raindrops in regions where the cloud droplets are large (e.g., 20 μm diameter). In this case, the graupel growth rates win also be enhanced by reductions in the graupel bulk densities, at least down to values as low as 0.2 g cm−3 or less. When encountering smaller cloud droplets, however, the apparent advantage of the graupel particles fades, and at times may even be reversed.