摘要
2013年7月9日宁夏出现了一次强降水天气过程,利用边界层风廓线雷达探测资料、多普勒天气雷达风廓线产品及常规观测资料,对本次过程最强降水时段雷达产品特征进行分析。结果表明:灵武站700 hPa附近存在12 m/s以上的偏东风急流和大小为0.033 s-1的风切变,是灵武站最大小时雨强大于银川站的主要原因;银川站从地面到900 m高度以下大气水汽含量较少,导致银川站累积降水量小于灵武站;在最强降水时段,灵武站风廓线雷达产品的中低层速度谱宽维持在1.2 m/s并接地,最大速度谱宽出现在700 hPa,达2.0 m/s;信噪比达到35 dB的高度层超过10个;700 hPa以上大气折射率结构常数达1.0×10-10及中低层向下垂直速度达10 m/s。研究结果揭示了风廓线雷达产品与强降水过程之间的联系,可作为灵武站是否出现强降水的判别指标。
The heavy precipitation process occurred on July 9,2013,in Ningxia.Based on the data of boundary wind profile radar,the radar echo characteristics of Doppler radar and conventional observation data during the period of the maximum rainfall in the heavy rainfall process are analyzed.The obtained results are as follows:Precipitation intensity occurred in the observation station of Lingwuis more than that occurred in Yinchuan,which is induced by the easterly jet and the wind shear over Lingwu observation station which is close to 700 hPa.The atmospheric humidity is less from the ground to the height of 900 m over the observation station of Yinchuan,which leds to the less accumulation precipitation in Yinchuan station than in Lingwu.The data of wind profile radar has significant characteristics during the period of strongest rainfall over the observation station of Lingwu.The velocity spectrum width in middle and lower troposphere maintains 1.2 m/s and extends to the ground.The maximum velocity spectrum width is 2.0 m/s in 700 hPa.There are 10 layers with a signal to noise ratio of 35 dB.The refractive index structure parameter is 1.0×10-10 nearly 700 hPa.The downward vertical velocity is 10 m/s in the middle and lower troposphere.The above results reveal the relationships among the heavy precipitation process and the products of boundary wind profile radar.In addition,these results are selected as diagnostic standard for the heavy precipitationin Lingwu station.
作者
李强
崔洋
谭志强
晁瑗
杨婧
张肃诏
LI Qiang;CUI Yang;TAN Zhiqiang;CHAO Yuan;YANG Jing;ZHANG Suzhao(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA,Yinchuan 750002,China;Key Laboratory for Meteorological Disaster Preventing and Reducing of Ningxia,Yinchuan 750002,China;Ningxia Meteorological Observatory,Yinchuan 750002,China;Ningxia Climate Centre,Yinchuan 750002,China)
出处
《宁夏工程技术》
CAS
2020年第3期193-199,共7页
Ningxia Engineering Technology
基金
宁夏回族自治区重点研发计划一般项目(2018BEG03067)。
关键词
风廓线雷达
水平风廓线
速度谱宽
信噪比
折射率结构常数
垂直速度
wind profiling radar
horizontal wind profile
velocity spectrum width
signal-to-noise ratio
refractive index structure parameter
vertical velocity
