近海面大气折射率结构常数统计特性分析

Statistical Analysis of Atmospheric Refractive Index Structure Parameter Under the Sea Surface Environment

大气折射率结构常数（Cn^2）是衡量湍流强度的重要物理量之一。利用大孔径闪烁仪对烟台地区近海面环境下2014年1～6月份的大气折射率结构常数进行了测量,对实测数据进行频率计数、日变化以及月变化统计特性分析,并与其他地理环境下的C2n值变化特征进行对比。统计分析对比结果表明：近海平面Cn^2值主要集中分布在10^-17～10^-14m^-2/3范围内,属于典型的中等偏弱湍流范畴;不同时段的Cn^2值没有呈现出其他环境常见的＂转换时刻＂变化特征,且夜晚与白天的Cn^2值无明显差别,日均值在10^-16～10^-14m^-2/3范围内变化,同时结合标准差对测试期间Cn^2数据的离散程度进行了详细的分析。

Atmospheric refractive index structure parameter（ Cn^2） is one of the impotant physical quantities measuring the degree of turbulence. The refractive index structure parameter under the sea surface environment in Yantai region from January to June in 2014 is measured by using a large aperture scintillometer. The statistical properties of measured data are analyzed, including frequency count, daily variation and monthly variation. The change characteristics of Cn^2 under the sea surface are compared with other environments. The comparative analysis result reveals that the value of Cn^2 varies between 10-17m^-2/3to 10^-14m^-2/3under the sea surface environment, which is classified as medium and weak turbulence. The Cn^2 at different times are not presented the variable characteristics of＂conversion time＂, and there are no significant differences between Cn^2 in the daytime and Cn^2 at night. The daily mean vary between 10^-16m^-2/3to 10^-14m^-2/3. At the same time, the discrete degree of Cn^2 is analyzed combing standard deviation.