基于小波变换的风廓线雷达大气边界层高度探测

基于小波变换的风廓线雷达大气边界层高度探测

戈书睿1)艾未华1)魏浩1)徐芬2)

（1 解放军理工大学气象海洋学院，南京，211101）

（2江苏省气象科学研究所，南京，211101）

大气边界层是地表与大气相互接触的一层大气，响应地面作用的时间尺度为一小时或者更短，大气边界层的厚度虽然只有几公里，但它是与人类关系最为密切的大气层。大气边界层的高度是污染物扩散模式、气候模式、大气模式的一个重要输入参数，边界层高度的变化对数值预报中的物理过程，天气预报的诊断分析，城市污染物的监控也有相当重要的作用。然而，边界层高度的连续监测缺乏有力的手段。风廓线雷达凭借其高时间分辨率和空间分辨率，加上其能够连续探测等优点，可以成为连续监测边界层高度的有效工具。利用协方差小波变换对风廓线雷达距离订正后信噪比数据进行分析，来确定边界层的高度，并与无线探空仪确定的边界层高度进行比较。采用不同的小波基函数对典型的风廓线雷达距离订正后的信噪比数据廓线进行变换，比较不同变化尺度下几种常用小波基函数变换的稳定性，得到最优的反演边界层高度的小波基函数，为实际应用提供参考。结果表明，协方差小波变换法与探空结果具有较好的一致性。

关键词：协方差小波变换；风廓线雷达；边界层高度；探测

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