上海浦东机场风廓线雷达信噪比资料在云底高度判定中的应用研究  

The Application of Wind Profiler SNR Data of Shanghai Pudong Aiport in the Detection of Cloud Base

作　　者：梅珏[1] 李新峰[1] 冯雷[1] 

机构地区：[1]民航华东空管局,上海200335

出　　处：《中国民航飞行学院学报》2017年第6期13-18,共6页Journal of Civil Aviation Flight University of China

摘　　要：风廓线雷达除能得到风速场资料外,还可以根据信号与噪声强度生成信噪比资料。风廓线雷达信噪比的变化与比湿梯度间具有显著的相关性。而云底是空气饱和与未饱和的临界面,必然有明显的比湿的梯度变化,在风廓线雷达上反映为信噪比的显著增强。本文提出了应用信噪比垂直梯度最大正值(信噪比随高度急剧增大)处的高度来反演云底高度的方法。利用上海浦东机场2015年1月1日-3月4日间风廓线雷达的信噪比资料,通过信噪比垂直梯度最大正值所在高度反演的云底高度与云高仪所测的云底高度间对比,发现两者具有较高的相关性,相关系数达到0.41,并通过了显著水平?(28)0.01的t检验。表明采用风廓线雷达的信噪比资料能有效反演无降水天气的云底高度。Besides the wind observation, the wind profiler can provide Signal-to-Noise ratio data （SNR）. Generally, the SNR has a high correlation with the gradient of moisture in the air. On the other hand, the cloud base is a border of saturated and unsaturated air. In this area, the specific moisture should be changed rapidly. Therefore, the specific moisture gradient in the cloud base is related to high SNR of wind profiler. In the paper, the method of retrieving the cloud base height using the maximum vertical gradient of the SNR is proposed. Using this method, the wind profiler radar data of Pudong airport from Jan. 1^st to Mar. 4^th of 2015 are analyzed. The results indicate that the wind profiler retrieved cloud base height has a good correlation with which observed from ceilometer. The correlation coefficient between these two sets of data is 0.41, which passed the t-test with α= 0.01.

关 键 词：风廓线雷达 信噪比 云底高度 

分 类 号：V321.2[航空宇航科学与技术—人机与环境工程]