夹卷层大尺度相干结构运动特征的室内模拟研究

大气与环境光学学报 ›› 2009, Vol. 4 ›› Issue (6): 432-440.

夹卷层大尺度相干结构运动特征的室内模拟研究

罗涛1, 袁仁民1*, 卢超1, 吴徐平1, 孙鉴泞2

(1 中国科学技术大学地球和空间科学学院, 安徽合肥, 230026; 2 南京大学大气科学系, 江苏南京, 210093)

收稿日期:2009-04-22 修回日期:2009-05-20 出版日期:2009-11-28 发布日期:2009-11-17
作者简介:罗涛 (1981-)，男，汉族，现于中国科学技术大学地球和空间科学学院搏士后，研究方向为大气边界层物理。
基金资助:
国家自然科学基金（40575005）资助

Laboratory Simulation Study of Characteristic of Large Scale Coherent Structure Movement in Entrainment Layer

LUO Tao1, YUAN Renmin1, LU Chao1, WU Xu-ping1, SUN Jian-ning2

(1 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; 2 School of Atmospheric Sciences, Nanjing University, NanJing 210093, China)

Received:2009-04-22 Revised:2009-05-20 Published:2009-11-28 Online:2009-11-17

摘要/Abstract

摘要：

大尺度相干结构是大气边界层中一种重要的物理现象。本文利用室内水槽模拟方法模拟对流边界层的发生发展，利用实验获取的光斑图像对夹卷层大尺度结构进行了研究。通过分析实验采集的光斑图样中大尺度相干结构的闪烁特性，发现其对应于光斑中长而亮的条纹，而在闪烁指数廓线中对应于峰。根据大尺度结构的这种闪烁特征，本文提出了一种空间相关方法计算其垂直平均速度，并对大尺度结构的运动特征进行了分析，结果表明，边界层顶部热泡以缓慢运动为主，其驱动了边界层顶部的发展。

关键词: 夹卷层, 大尺度相干结构, 室内水槽模拟, 光斑, 空间相关方法

Abstract:

Large scale coherent structure, a physical phenomenon of major importance in atmospheric boundary layer, is observed in laboratory tank simulation. By analyzing its scintillation characteristic in beam pattern, it’s found that the structure corresponds to the long and bright stripe in beam pattern, and the peak in scintillation index profile, so its vertical average velocity could be obtained by the spatial cross-correlation of scintillation index. And, by means of spatial correlation, vertical movement characteristics of large scale coherent structure at boundary layer top are studied. The results show that, the large-coherent structure at the boundary layer top, mainly with very slow speed, drives the developing of boundary layer top.

Key words: entrainment layer, large scale coherent structure, laboratory simulation, beam pattern, spatial correlation

中图分类号:

P401

罗涛袁仁民卢超吴徐平孙鉴泞. 夹卷层大尺度相干结构运动特征的室内模拟研究[J]. 大气与环境光学学报, 2009, 4(6): 432-440.

LUO Tao, YUAN Ren-Min, LU Chao, WU Xu-Ping, SUN Jian-Ning. Laboratory Simulation Study of Characteristic of Large Scale Coherent Structure Movement in Entrainment Layer[J]. Journal of Atmospheric and Environmental Optics, 2009, 4(6): 432-440.

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