摘要
利用风廓线雷达对2018—2023年秭归发生的强降水过程在风廓线雷达上的特征进行研究。结果表明:造成秭归强降水的天气形式中,准正压类占比最高,其后依次为斜压锋生和暖强迫;在准正压类强降水天气过程中,风廓线雷达探测到的风速无明显变化;斜压锋生类和暖平流类有明显的急流发展、急流能量下传和大风速区范围的扩展,与强降水发生时段对应;斜压锋生类有明显的中低层切变线,暖平流则不明显;斜压锋生类及暖强迫类强降水过程中,降水开始之前都存在长时间的中低层上升运动,直至降水开始前0.5~1h,整层逐渐转变为下沉运动,且下沉速度大值时间段与强降水时段吻合。
This study utilizes wind profile radar data to investigate the characteristics of heavy precipitation processes in Zigui from 2018 to 2023.The analysis reveals that among the synoptic patterns associated with heavy precipitation in Zigui,quasi-barotropic systems are the most prevalent,followed by baroclinic frontogenesis and warm forcing.In the context of quasi-barotropic systems,the wind profile radar detects no significant wind speed variations.In contrast,baroclinic frontogenesis and warm advection are characterized by distinct jet development,downward propagation of jet energy,and the expansion of areas with high wind speeds,which are in phase with the heavy precipitation periods.Baroclinic frontogenesis exhibits a well-defined mid-to-low-level shear zone,whereas warm advection does not present such clarity.Prior to the onset of heavy precipitation in baroclinic frontogenesis and warm forcing events,there is an extended period of mid-to-low-level ascending motion,which transitions to a subsidence phase approximately 30 to 60 minutes before precipitation commences.This transition is coincident with the period of intense precipitation.
作者
周杰
何满
枚雪彬
杨白玉
ZHOU Jie;HE Man;MEI Xuebin;YANG Baiyu(Zigui County Meteorological Bureau,Zigui 443600,China;Yichang Meteorological Bureau,Yichang 443000,China;Zigui County Artificial Weather Modification Service Center,Zigui 443600,China)
出处
《黑龙江环境通报》
2024年第11期43-45,共3页
Heilongjiang Environmental Journal
关键词
风廓线雷达
强降水
急流
wind profile radar
heavy precipitation
jet stream
