海洋大气近地层折射指数模式及其在蒸发波导分析上的应用

利用Ｍｏｎｉｎ－Ｏｂｕｋｈｏｖ相似理论给出了不同大气结条件下海洋大气近地层折射指数模式，并利用这些模式分析了蒸发波导内可能存在的波导模，给出了确定蒸发波导所能捕获最大电磁波波长及相应最低频率的计算式并对其在不同大气层结条件下的计算结果进行了比较，发现在不稳定、中性和近中性层结条件下，其计算结果比较接近，但在强稳定层结条件下，差异显著，最后给出了射线追踪方程，并通过用多层线性模式来近似蒸发波导内大气

The Refractivity Models in the Marine Atmospheric Surface Layer and Their Applications in the Evaporation Duct Analysis

The refractivity models in the marine atmospheric surface layer under variant atmo-spheric stability were given first by using the Monin-Obukhov similarity theory. By using the models given, the probable waveguide modes in the evaporation duct were analysed, and the formulas to determine the maximum electromagnetic wavelength and the corresponding minimum freqiemcu trapped by the evaporation duct were given, By comparing the calculations under variant atmospheric stability conditions, it was found that the results were comparable under the unstable,neutral, and near neutral stability conditions, but they were significantly different from the results under the strong stable conditions. The equations for ray tracing were given last, and the ray propagation situation in evapo-ration duct was analysed. It was found that the ray trapped by the duct were finally trapped to the very low height layer just above the sea surface, and it was more significant under the unstable atmo-spheric stability condition.