| 2018年一次非典型梅雨锋暴雨过程诊断分析 |
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| 引用本文： | 毛程燕,李浩文,龚理卿,孙杭媛,王健疆,陈慧玲.2018年一次非典型梅雨锋暴雨过程诊断分析[J].气象与环境学报,2019,35(6):8-13. |
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| 作者姓名： | 毛程燕 李浩文 龚理卿 孙杭媛 王健疆 陈慧玲 |
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| 作者单位： | 衢州市气象局,浙江 衢州 324000;广州市气象台,广东 广州 511430 |
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| 基金项目： | 浙江省气象局预报员专项项目（2018YBY05）和衢州市气象局一般项目（2018QZ08）共同资助。 |
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| 摘 要： | 利用常规地面气象观测资料、NCEP/NCAR FNL 1°×1°网格点逐6 h再分析资料，对2018年6月20日浙江省一次暴雨过程的主要环流系统、等熵位涡、垂直螺旋度等进行了天气动力学诊断分析。结果表明：850 hPa低涡切变、对流层中层冷空气、200 hPa南亚高压、副热带高压是此次暴雨过程发生的主要影响系统；700 hPa上的正垂直螺旋度中心对暴雨的发生有良好的指示意义；等熵位涡的演变和形态对冷空气活动有较好的视踪作用，等熵位涡中心两侧气流辐合，有利于低压系统发展，高层等熵位涡与冷空气活动有较好的对应关系，等熵位涡大值区偏南侧的移动与强降水落区有较好的对应关系。
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| 关 键 词： | 系统耦合 垂直螺旋度 等熵位涡 诊断分析 |
| 收稿时间： | 2018-09-14 |
Diagnostic analysis of a non-typical rainstorm event due to Meiyu fronts in 2018 |
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| MAO Cheng-yan,LI Hao-wen,GONG Li-qing,SUN Hang-yuan,WANG Jian-jiang,CHEN Hui-ling.Diagnostic analysis of a non-typical rainstorm event due to Meiyu fronts in 2018[J].Journal of Meteorology and Environment,2019,35(6):8-13. |
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| Authors: | MAO Cheng-yan LI Hao-wen GONG Li-qing SUN Hang-yuan WANG Jian-jiang CHEN Hui-ling |
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| Institution: | 1. Quzhou Meteorological Service, Quzhou 324000, China;2. Guangzhou Meteorological Observatory, Guangzhou 511430, China |
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| Abstract: | Based on conventional meteorological data and the 6-h FNL 1°×1° reanalysis data from National Centers for Environment Prediction (NCEP)/National Centers of Atmospheric Research (NCAR),we conducted the dynamic diagnosis analysis on a rainstorm event in Zhejiang province on June 20,2018,which includes the major circulation systems,isentropic potential vorticity,and vertical helicity.The results indicated that the major influencing systems for this rainstorm event are the low-level vortex shear at 850 hPa,weak cold air intruded in the middle troposphere,the South Asian Anticyclone and the Subtropical High at 200 hPa.Positive vertical helicity center at 700 hPa is a good indicator of the occurrence of rainstorm events.The evolution and form of isentropic potential vorticity are indicative of cold air activity.The convergence of airflow on both sides of the isentropic vorticity center is favorable for the development of surface low pressure.High-level isentropic potential vorticity corresponds well to the cold air activity,and precipitation areas are influenced greatly by the movement of areas with large isentropic potential vorticity values towards the south. |
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| Keywords: | System coupling Vertical helicity Isentropic potential vorticity Diagnostic analysis |
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