论文标题
表征云喂养相干边界层结构的形状，大小和方向
Characterising the shape, size and orientation of cloud-feeding coherent boundary layer structures
论文作者
论文摘要
本文提出了两种技术，用于通过分析浅层积云云的大涡模拟，表征云喂养相干边界层结构，从而对比有或没有环境剪切的对比条件。第一个技术是两点相关函数的概括，其中可以提取相关长度尺度和方向。第二种技术通过这些结构的形状，大小和方向分解了相干结构的垂直传输。发现主导垂直通量的结构具有羽状（从表面延伸到云），在没有环境风的情况下显示出小宽度/厚度不对称性并几乎垂直上升。还量化了由环境剪切引入的平面拉伸和边界层结构引起的边界层结构的倾斜，这证明了该技术在未来研究其他边界层模式的研究中的一般适用性。
This paper presents two techniques for characterisation of cloud-feeding coherent boundary layer structures through analysis of large-eddy simulations of shallow cumulus clouds, contrasting conditions with and without ambient shear. The first technique is a generalisation of the two-point correlation function where the correlation length-scale as well as orientation can be extracted. The second technique decomposes the vertical transport by coherent structures by the shape, size and orientation of these structures. It is found that the structures dominating the vertical flux are plume-like in character (extending from the surface into cloud), show small width/thickness asymmetry and rise near-vertically in the absence of ambient wind. The planar stretching and tilting of boundary layer structures caused by the introduction of ambient shear is also quantified, demonstrating the general applicability of the techniques for future study of other boundary layer patterns.
