摘要
为了研究动量下传大风的特征、探讨动量下传大风的预报方法,利用美国国家环境预报中心(NCEP)再分析资料、常规气象观测资料和测风激光雷达(LiDAR)资料,对银川机场2022-03-06动量下传大风过程进行了分析。结果表明,银川机场位于西风急流入口左侧的辐合区,为动量下传大风的发生提供了有利的环流背景,在晴空条件下,测风激光雷达产品可以精准探测动量下传大风的时空演变特征;多普勒光束摆动(DBS)模式产品中强下沉气流标志动量下传开始,平面位置显示(PPI)模式探测范围的衰减程度和变化方位反映了沙尘天气强度和影响路径,距离高度显示(RHI)模式500 m高度径向风分层现象的出现及被破坏是动量下传变化的预报指标;利用测风激光雷达可提前30 min计算和预报出动量下传大风的出现时间。该研究对提高气象服务保障能力具有重要意义。
In order to research the characteristics of momentum downward gale and discussion on forecast method of momentum downward gale,the momentum downward gale process at Yinchuan Airport on 2022-03-06 was analyzed by using the reanalysis data of National Centers for Environmental Prediction(NCEP),conventional meteorological observation data,and wind light detection and ranging(LiDAR)data.The results show that Yinchuan Airport is located in the convergence area on the left side of the westerly jet inlet,which provides a favorable circulation background for the occurrence of momentum downward gale;Under clear sky conditions,the temporal and spatial evolution characteristics of momentum downwind can be accurately detected by the wind LiDAR product;the strong downdraft in the Doppler beam swinging(DBS)mode product marks the beginning of momentum downward transmission,the attenuation degree and change direction of the detection range of the plan position indicator(PPI)mode reflect the sand dust weather intensity and influence path,the occurrence and destruction of radial wind stratification at 500 m height in the range height indicator(RHI)model are the prediction indicators of momentum downward transmission changes;Using the wind LiDAR,the time of occurrence of downwind strong wind can be calculated and predicted 30 min in advance.This research is of great significance to improve the meteorological service support capability.
作者
梁希豪
杨寅
冯亮
杜星
王清平
LIANG Xihao;YANG Yin;FENG Liang;DU Xing;WANG Qingping(Ningxia Air Traffic Management Sub-bureau of CAAC,Yinchuan 750009,China;National Meteorological Center,Beijing 100081,China;XinJiang Air Traffic Management Bureau of CAAC,Urumqi 830016,China)
出处
《激光技术》
CAS
CSCD
北大核心
2023年第3期432-438,共7页
Laser Technology
基金
国家重点研发计划资助项目(2018YFC1507505)
中国气象局创新发展专项基金资助项目(CXFZ2021Z033)。
关键词
激光技术
大风预报
测风激光雷达
动量下传
温度对数压力图
laser technique
gale forecast
wind light detection and ranging
momentum downward
temperature logarithmic pressure diagram
