蒸发波导模型特征及其适用性研究-海洋预报

蒸发波导模型特征及其适用性研究

单位：中国电波传播研究所电波环境特性及模化技术重点实验室, 山东青岛 266107

分类号：TNO11.3

出版年·卷·期（页码）：2013·30·第五期（75-83）

摘要：

蒸发波导是海面上经常出现的大气结构,实时获取蒸发波导环境下的大气折射率剖面,对于海上运作的雷达、通信、导航等系统效能发挥具有重要意义.通常通过测量近海面高度上的空气温度、湿度、风速和气压,以及海面温度,采用蒸发波导模型来确定蒸发波导环境下的大气折射率剖面.针对目前不同蒸发波导模型在相同大气条件下波导高度预测结果存在差异的问题,对5种蒸发波导模型进行了模型误差敏感性分析,同时基于铁塔平台实测水文气象数据计算的蒸发波导高度与不同模型预测的高度进行了比较,给出了不同大气稳定性条件下蒸发波导模型使用建议,所得结果对海上蒸发波导环境下的电波传播特性计算以及蒸发波导的预报具有一定的指导意义.

TEvaporation ducts are ubiquitous phenomena over the oceans, and obtaining the modified refractivity profile in the evaporation duct environment in real-time is useful for radar, communication, navigational fixing etc. Usually, the modified refractivity profile can be determined using evaporation duct model from measured atmospheric pressure, air temperatures, air humidity and wind speed at a single height within the marine atmospheric surface layer, and sea surface temperature. In most cases, under the same condition of atmospheric stratification, the heights of ducts computed by different models are difference. Based on the different models characteristics, sensitivity analysis is compared. Meanwhile, Comparison of these models is made using data collected from a meteorology grads tower which was founded in the Bohai Sea in June and August. Recommendations for selection of optimal models are given. The conclusions provide help for improving the evaporation duct forecasts and computing radio wave propagation in the condition of evaporation duct.

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