赵继芝, 江月松, 路小梅, 叶继海. 大气云层分布的偏振激光后向散射研究[J]. 应用光学, 2011, 32(5): 1037-1043.
引用本文: 赵继芝, 江月松, 路小梅, 叶继海. 大气云层分布的偏振激光后向散射研究[J]. 应用光学, 2011, 32(5): 1037-1043.
ZHAO Ji-zhi, JIANG Yue-song, LU Xiao-mei, YE Ji-hai. Polarized laser backscattering of atmospheric clouds distribution[J]. Journal of Applied Optics, 2011, 32(5): 1037-1043.
Citation: ZHAO Ji-zhi, JIANG Yue-song, LU Xiao-mei, YE Ji-hai. Polarized laser backscattering of atmospheric clouds distribution[J]. Journal of Applied Optics, 2011, 32(5): 1037-1043.

大气云层分布的偏振激光后向散射研究

Polarized laser backscattering of atmospheric clouds distribution

  • 摘要: 利用大气激光后向散射垂直剖面图与消偏振度相结合的方法,分析CALIPSO卫星偏振激光雷达的后向散射信号。以2008年11月23日和24日的CALIPSO卫星数据为例,研究了北京地区大气中云层在可见光和红外光波段的垂直和水平分布特征。利用交互式数据语言IDL(interactive data language)得到大气后向散射强度的垂直分布及其消偏振度,根据垂直剖面图可以直观地观测大气中各成分(如气溶胶、低空云和卷云等)的空间分布情况,并且能清楚地显示大气边界层的高度,由消偏振度可准确获得云层的分布高度及厚度。观测数据的处理结果表明:在海拔高度3 km~7 km存在厚度为2 km~2.5 km的云,其消偏振度约为0.2。

     

    Abstract: This paper presented a method of using backscatter vertical cross-section and depolarization ratio to analyze the backscatter data of polarization LIDAR of cloud aerosol lidar and infrared pathfinder satellite observations (CALIPSO) satellite. Taking the CALIPSO data on Nov. 23rd and 24th, 2008 for example, it studied the distribution of the cloud in atmosphere in the visible and infrared light in Beijing area. Backscatter vertical profiles and depolarization ratio were drawn by interactive data language (IDL). The vertical distribution directly described the distribution of each component in the atmosphere such as aerosols, low cloud and cirrus, and showed the height of atmospheric boundary layer. The depolarization ratio gave the height and thickness of cloud. Two observations showed that there existed clouds with the thickness of 2 km~2.5 km and the depolarization ratio of 0.2 at the altitude of 3 km~7 km, and the method could distinguish between cloud and aerosol and provide spatial distribution of them more conveniently.

     

/

返回文章
返回