丘陵地区边界层风廓线雷达数据统计特性分析

Statistical characteristics analysis on the boundary wind profile radar data in Fujian hilly areas

采用数据获取率来分析和评价风廓线雷达的探测能力,对通过2012年的风廓线数据进行统计分析。结果表明:数据获取率和信噪比都随季节变化,夏季探测能力大于冬季。按照数据获取率达到80%的要求,确定边界层风廓线雷达无降雨天气有效探测高度为3 km,并确定低模和高模最佳衔接高度为0.6 km,能够获得更好的数据获取率。在无降雨天气,信噪比随高度呈现对数函数单调递减的变化规律,夏季信噪比的衰减程度比冬季大;在降雨天气,信噪比随高度呈现一次函数的变化规律,其斜率范围在-10.44^-2.47之间,而夏季信噪比的衰减程度比冬季小。

In order to analyze and evaluate the detection ability of wind profile radar by data availability,the wind profile data in 2012 was statistically analyzed. Results showed： both data availability and signal to noise（ SNR） vary with seasons,and the detection capability in summer is stronger than that in winter; according to the requirement of 80% data availability,3 km effective detection height of the boundary wind profiler in non-precipitation weather and 0. 6 km optimal connecting height of low and high model are determined. SNR decreases with height according to logarithm monotone law in non-precipitation weather,and the decreasing degree of SNR＇s attenuation in summer is bigger than that in winter,while in rainy weather,SNR follows linear function law and its slope ranges from-10. 44 to-2.47,and vice versa.