【摘要】 为研究暴雨过程中逆风区特征及应用判据,统计分析2010—2017年山东临沂地区暴雨过程中的多普勒雷达观测资料,结果表明:暴雨过程中,风暴内的垂直环流是造成逆风区发生发展的直接原因;逆风区表现为β中尺度和γ中尺度,其形态在不同天气类型下有明显差异;逆风区持续阶段降水强度增大,持续时间与过程累积雨量呈正相关;当雷达最低仰角识别到逆风区,其厚度≥4. 0 km、强度≥15 m·s^-1、径向速度绝对值最大值≥5 m·s-1且持续30 min以上时,风暴常明显发展,相关特征可用于预报风暴和暴雨的发展。更多还原

【Abstract】 The Doppler radar data of torrential rainfall processes in Linyi,Shandong from 2010 to 2017 are statistically analyzed to study the characteristics and its application criteria of adverse wind areas during these processes. Results reveal that: 1) the occurrence and development of adverse wind areas are direct results of the vertical circulations inside the storms during the torrential rainfall processes; 2) the adverse wind areas present meso-γ and meso-β scales with different shapes in different weather types;3) the precipitation intensity tends to increase while the adverse wind areas persistently exist,and the duration of the adverse wind is positively correlated to the accumulated precipitation; 4) when the radar identifies the adverse wind area at the lowest elevation angle with the thickness equal to or greater than 4. 0 km,the intensity equal to or greater than 15 m · s-1,the absolute value of the maximum radial velocity equal to or greater than 5 m·s^-1,and the duration above 30 minutes,the storm generally significantly develops. Relevant characteristics can be reference in forecasting storms and torrential rainfall processes.更多还原