Lidar studies of aerosols and non-Kolmogorov turbulence in the Mediterranean troposphere
Lidar studies of aerosols and non-Kolmogorov turbulence in the Mediterranean troposphere
复制标题
DOI：
10.1117/12.629687
复制
发表时间：
2005-10
期刊：
影响因子：
--
通讯作者：
A. Zilberman;E. Golbraikh;N. Kopeika
中科院分区：
文献类型：
--
作者：
A. Zilberman;E. Golbraikh;N. Kopeika
对光电系统性能的估计取决于传播预测码中使用的大气模型的精度。在目前的工作中，我们证明了在实际大气中(在表层以上)，被动标量涨落的湍流场可以不同于Kolmogorov模型。从气溶胶浓度不均匀散射的激光雷达信号强度起伏谱估计大气湍流谱的行为(指数γ)。根据实验数据，湍流谱的幂指数可以不同于纯柯尔莫戈洛夫(γ=5/3)的情况。文中还给出了地中海地区(以色列Be‘er-Sheva)不同高度气溶胶粒子分布、体积和数浓度的激光雷达测量结果，并与模式(AFGL、MODTRAN)进行了比较。这对光通信、大气成像和自适应光学可能具有重要意义。
The estimation of the performance of electro-optical systems depends on the accuracy of the atmospheric models being used in the propagation prediction codes. In the present work we demonstrate that in a real atmosphere (above the surface layer) the turbulent field of passive scalar fluctuations can differ from Kolmogorov's model. From the spectrum of the intensity fluctuations of LIDAR signals scattered by aerosol concentration inhomogeneities, the behavior of atmospheric turbulence spectrum (power law exponent γ) is estimated. As follows from the experimental data the power law exponent of the turbulent spectra can be different from the case of purely Kolmogorov (γ=5/3). Also, results of lidar measurements of aerosol size distribution, volume, and number concentration at different heights in the Mediterranean region (Be'er-Sheva, Israel) and comparison with models (AFGL, MODTRAN) are presented. Implications can be important for optical communication, imaging through the atmosphere, and adaptive optics.