远海海面大气光学湍流实验测量  

Experimental investigation of open sea atmospheric optical turbulence

作　　者：王倩[1,2] 梅海平 李玉剑[3] 邵士勇 李学彬 饶瑞中 

机构地区：[1]中国科学院安徽光学精密机械研究所大气光学研究中心,中国科学院大气成分与光学重点实验室,合肥230031 [2]中国科学院大学,北京100049 [3]中国卫星海上测控部,江阴214431

出　　处：《物理学报》2016年第7期171-177,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:41205010)资助的课题~~

摘　　要：将光纤湍流测量系统搭载于我国的"远望号"航天测量船,首次实现了远海海面大气光学湍流的空间多点同步测量,初步获得了远海海面大气光学湍流的基本特征和定量数据.测量共进行了37天,测量数据处理包括大气光学湍流强度的统计分析、采用Greenwood湍流空间相关函数模型对实测的光学湍流空间相关函数进行非线性拟合从而获得湍流的空间外尺度,以及采用分段拟合算法获取光学湍流的功率谱标度指数.结果表明:海面大气光学湍流强度中等偏弱,且无明显规律性的日变化趋势;空间外尺度较小,约为0.2—0.3 m;湍流谱标度指数符合-5/3次方的概率均为25%左右,低于相应的近地面概率.In this article, a high-quality fiber optical turbulence sensing array is arranged on the ocean-going instrumentation ship-Yuan Wang for 37 day continuous measurement. It is the first time that the spatial multipoint simultaneous measurement of maritime atmospheric optical turbulence has been realized. According to the measurement, the essential characteristics and quantitative data of the atmospheric optical turbulence on the open sea are obtained. Then the Greenwood spatial correlation function model is used for evaluating the outer scale of optical turbulence by a nonlinear fitting algorithm. Finally, the optical turbulence spectrum is divided into two sections, and the power spectrum scaling exponent is given by a section algorithm. Results show that the intensity of maritime atmospheric optical turbulence is a little smaller than that in the near ground layer and has no obvious diurnal variation characteristic. The value of outer scale is small and in a range of 0.2–0.3 m. It is easily found that the probability that the turbulence spectrum scaling exponent conforms to-5/3 is about 25% near the surface of open sea, which is smaller than that in the near ground layer.

关 键 词：海洋大气光学 湍流强度 空间外尺度 功率谱标度指数 

分 类 号：O357.5[理学—流体力学]