摘要
利用常规观测资料、自动气象站观测资料及NCEP1°×1°再分析资料,对2016年10月和2018年9月登陆我国华南沿海的2次台风在浙江省产生的暴雨过程进行对比分析,结果表明:(1)1622号台风“海马”暴雨属于台风本体环流降雨,1822号台风“山竹”暴雨属于台风远距离暴雨。(2)前者水汽主要来自南海,沿台风低压环流及副高边缘的偏南风急流向暴雨区输送,后者水汽主要来自东海和西太平洋,沿副高西南侧的东南气流向暴雨区输送,前者急流强度和水汽通量均强于后者。(3)前者过程后期才有干冷空气从底层侵入,强度较弱,暴雨中尺度系统特征不明显,降水对流性较弱,后者整个过程都有干冷空气侵入,前期来源于对流层低层,后期来源于对流层高层,冷空气的侵入激发了中尺度对流系统的发生发展,降水对流性较强。(4)2次过程的动力学特征也有所不同,前者正涡度中心发展高度比后者低,但强度偏强,后者辐合辐散发展高度比前者深厚,但强度偏弱。
Based on regular observation data, automatic weather station observation data and NCEP1°*1° reanalysis data, we have comparative analyzed the rainstorm in Zhejiang Province caused by two typhoons landing on the coast of South China in October 2016 and September 2018,The results show that:(1) The rainstorm of typhoon 1622 “Haima” belong to the circulation rainfall of typhoon itself, and the rainstorm of typhoon 1822 “Mangkhut” belong to the long-distance rainstorm of typhoon.(2) The former’s water vapor comes from the South China Sea which transports southerly jet flow from the circulation of typhoon low pressure and the edge of Subtropical high to the rainstorm area, and the later’s water vapor comes from the East China Sea and the Western Pacific which transports southeast airflow from the southwest side of Subtropical high to the rainstorm area.(3) In the later stage of the former process which belong to weak convective precipitation, dry and cold air intrudes from the bottom, the intensity is weak and mesoscale system is not obvious. In the latter process, dry and cold air intrudes into the whole process, originating from the lower troposphere in the early stage and the upper troposphere in the later stage, the intrusion of cold air stimulates the occurrence and development of mesoscale convective system, and precipitation is convective.(4) The dynamic characteristics of two processes are also different. The development height of positive vorticity center of the former is lower than the latter, but the intensity of the latter is stronger. The development height of convergence and convergence emission of the latter is deeper than the former, but the intensity is weaker.
作者
沈晓玲
王雪阳
Shen Xiaoling;Wang Xueyang(Shaoxing Meteorological Bureau of Zhejiang,Shaoxing,Zhejiang 312000,China;Shaoxing Disaster Prevention and Mitigation Center of Zhejiang,Shaoxing,Zhejiang 312000,China)
出处
《科技通报》
2022年第6期15-23,共9页
Bulletin of Science and Technology
基金
浙江省气象局预报员专项2020YBY16。
关键词
台风
暴雨
冷空气
对比分析
typhoon
rainstorm
cold air
comparative analysis
作者简介
沈晓玲(1980-),女,浙江绍兴人,副高,学士,从事中短期预报研究,E-mail:13893561@qq.com。
