Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams

Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams
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液云中混合的理论分析 - 第四部分：DSD 演化和混合图

DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Khain
A. Khain
中科院分区：
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文献类型：
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作者：
M. Pinsky;A. Khain

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抽象的。由于多云和多云之间的混合而引起的液滴尺寸分布（DSD）的演变 研究了不同云分数值的干体积， 对于不同的初始DSD形状。分析使用 扩散-蒸发模型，描述了 混合体积内的湍流扩散和液滴蒸发。时间 DSD特征的演变，例如液滴浓度、LWC和 分析了平均体积半径。混合图绘制为最终的 混合阶段。结果表明，混合图之间的差异 对于均匀和不均匀混合是无关紧要的，并随着 DSD宽度的增加。均值的归一化立方的依赖性 云分数的体积半径进行了比较， 液滴浓度和发现是完全不同的。如果标准化的 使用液滴浓度，混合图未显示任何显著的 依赖于干体积中的相对湿度。研究的主要结论是传统的混合图不能 是分析混合类型的可靠工具。
Abstract. Evolution of droplet size distribution (DSD) due to mixing between cloudy and dry volumes is investigated for different values of the cloud fraction and for different initial DSD shapes. The analysis is performed using a diffusion–evaporation model which describes time-dependent processes of turbulent diffusion and droplet evaporation within a mixing volume. Time evolution of the DSD characteristics such as droplet concentration, LWC and mean volume radii is analyzed. The mixing diagrams are plotted for the final mixing stages. It is shown that the difference between the mixing diagrams for homogeneous and inhomogeneous mixing is insignificant and decreases with an increase in the DSD width. The dependencies of the normalized cube of the mean volume radius on the cloud fraction were compared with those on normalized droplet concentration and found to be quite different. If the normalized droplet concentration is used, mixing diagrams do not show any significant dependence on relative humidity in the dry volume. The main conclusion of the study is that traditional mixing diagrams cannot serve as a reliable tool for analysis of mixing type.