基于Monin-Obukhov相似理论估算近地面光学湍流强度

Optical Turbulence of Atmospheric Surface Layer Estimated Based on the Monin-Obukhov Similarity Theory

基于Monin-Obukhov相似理论实现了用常规气象参数估算近地面光学湍流强度Cn2的两种方法。主要输入的参数是两个高度上的气温、相对湿度和风速参量,并将结果与实际测量的Cn2值进行了比较。两高度温差ΔT是模式中最敏感的参数,避免使用难以准确测量的下垫面粗糙度、地表面/海表面层上温湿度等参量作为输入参数,使将来采用各气象台站测量的常规气象参数历史数据估算湍流强度成为可能。

Two optical turbulence models, based on the Monin-Obukhov similarity theory, are used to estimate turbulence intensity C2n in atmospheric surface layer. The inputs to the models are the difference of temperature, specific humidity and wind speed taken from two heights above ground. Model results are compared with measurement of C2n, with micro-thermometer. The difference of temperature AT is the most sensitive parameter. It is avoided to use roughness length, soil and sea surface temperature and specific humidity which are not easy to be measured accurately as input parameters. It is possible to estimate optical turbulence using historical data of standard meteorological parameters.