可业务化运行的L波段探空系统高空风改进算法

为进一步挖掘L波段高空气象探测业务系统原始资料潜力、优化改进现行测风业务算法,本文基于新疆博湖东岸L波段系统机动站累积的两年探空原始资料,提出了可业务化运行的高空风改进算法。该算法首先对雷达原始秒点坐标进行严格的质量控制,采用低通滤波、加权最小二乘法、线性补缺等方法去除探空仪摆动、雷达测量误差等对秒点坐标造成的扰动；然后采用逐秒点坐标滑动计算矢量平均风,通过与同球施放的GPS探空做比对分析得出,在全程使用50-60s计算时间窗口或前50分钟使用30-40s时间窗口、50分钟以后使用50-60s时间窗口条件下,雷达矢量平均风廓线与GPS矢量平均风廓线吻合较好；规定高度层风和固定垂直分辨率高度层风采用查找表方法确定,其结果不仅能在风场结构上与现行业务算法一致,同时能呈现出明显的风层脉动信息。

New Upper-air Wind Measurement Operational Algorithm for L-Band Radiosonde Sounding System

In order to further mining raw-data potential of L-band radiosonde sounding system and improve current upper-air wind measurement operational algorithm, based on the two years of sounding data obtained by the L-band radiosonde sounding system in Xinjiang Bosteng lake area, an improved upper-air wind measurement algorithm could be used in routine operation is presented. The algorithm firstly run a strict quality control procedure on original second-ordered coordinate data, using low-pass filter, weighted least squares and linear compensation methods to remove coordinate data disturbance caused by radiosounder swinging, radar measurement error and atmospheric turbulence; then adopt the vector average wind calculation method in certain time-window second by second to obtain second-ordered wind speed/direction. Through comparative analysis with same-balloon GPS sounding, the radar sounding wind-profile is in better agreement with GPS when using 50-60s time-window whole process, or using the 30-40s time-window before the 50min and 50-60s time-window after the 50min; fixed vertical resolution altitude wind-profile is obtained from the lookout-table method using second-ordered wind-profile,