闽北地区边界层移动风廓线雷达对比试验评估

Comparative Experimental Evaluation of Moving Boundary Layer Wind Profiler Radar in the Northern of Fujian Province

为了更好地把握风廓线雷达的探测性能和数据精度,对移动风廓线雷达与L波段探空雷达资料进行对比统计分析,结果表明:移动风廓线雷达的有效数据获取率达到80%的高度为3500 m,符合边界层风廓线雷达的有效探测高度。移动风廓线的径向速度平均差和标准差随着高度的增加而增加,东西方向的径向速度误差比南北方向的高约0.5-1.0 m/s。风廓线雷达自身数据的准确性良好,但是降雨对数据的准确性影响比较大。这次对比试验结果表明,对比试验应该选择比较平稳的天气过程。由于秋冬季节大气环流比较稳定,降雨类型多为层状云降雨,因而风廓线雷达数据可靠性高;对流性降雨过程往往造成风廓线雷达资料可靠性降低。

In order to grasp the wind profile radar detection performance and the data accuracy, the data of the moving wind profile radar and the L band sounding radar were analyzed. The results show that ： the height of the effective obtained data rate 80% of the moving wind profile radar is 3500 m, which is consistent with effective detection height of the boundary layer wind profile radar. The mean difference and standard deviation of the moving wind profiler＇ s the radial velocity increases with increasing detection height. The radial velocity mean difference in east-west direction is about O. 5--1.0 m/s higher than that of north-south direction. The accuracy of wind profile radar＇ s data is good, but the accuracy of rainfall data is relatively low. The comparative experiments results show that： the comparative experiments should select more stable weather process. Atmospheric circulation of autumn and winter seasonal is relatively stable and many most of the rainfall are stratiform precipitation, which produces the high reliability of wind profile radar data; and convective rainfall process often causes low reliability of wind profile radar data.