多普勒测风激光雷达与 L 波段探空对比分析

利用北京国家基本气象站内多普勒测风激光雷达和 L 波段探空系统在 2020 年 1 月 1 日至 5 月 31 日期间进 行了同步观测试验, 在经过观测数据时间和空间匹配的基础上, 以后者测风数据为参照标准, 从探测风廓线的高度、 风向和风速三个方面的一致性分析了激光雷达的测风数据质量。结果显示: 在观测试验期间, 激光雷达 56.5% 的观测 时间里最大探测高度不低于 2000 m, 2.9% 的观测时间最大探测高度不足 1000 m; 激光雷达探测获取的水平风向、风 速与 L 波段探空系统具有较好的一致性, 针对匹配得到的 8491 组对比观测数据, 其风向和风速数据拟合总相关系数 分别为 0.965 和 0.986; 总体风向、风速的平均偏差和均方根误差分别为 ?1.3? 和 16.1?、0.21 m·s ?1 和 1.06 m·s ?1 ; 在 2000 m 以上高度, 由于激光雷达观测数据的信噪比偏弱, 获得可信的观测数据量减少, 会对风向、风速一致性比对造 成不利影响。

Inter-comparison of wind measurements between Doppler wind lidar and L-band radiosonde

Using the WINDCUBE 100S Doppler wind lidar (DWL) and L-band radiosonde (LRS) installed at Beijing National Basic Meteorological Observing Station, the wind measurement synchronous comparative observation test was carried out from January 1 to May 31 in 2020．Based on the time and space matching of the observation data, the data quality of wind lidar was analyzed taking L-band radiosonde data as the reference standard from three aspects, i.e., the height of the wind profile, the wind speed and the wind direction. The results show that the maximum detection height of wind lidar was not less than 2000 m in 56.5% of the observation time and less than 1000 m in 2.9% of the observation time. The two set of wind measurements from lidar and L-band radiosonde have good consistency with each other. The total correlation coefficient of 8491 groups of matched observation data for wind direction and wind speed are 0.965 and 0.986, respectively. The mean error (ME) and root mean square error (RMSE) of overall wind direction (WD) and wind speed (WS) are ?1.3? and 16.1? , 0.21 m·s ?1 and 1.06 m·s ?1 , respectively. Due to the weak signal-to-noise ratio of the observation data of wind lidar, the amount of reliable matching data is reduced above 2000 m altitude, which results in a negative impact on the reliability of the consistency comparison. These results can provide references for the reliability test method of wind lidar and its application in meteorological.