高低空急流的配置对2015年8月3日辽宁暴雨的影响机制  

Study of the Dynamic Effects of the Upper and Low-Level Jet Collocation on the Liaoning Rain Storm of 3 Aug 2015

作　　者：谭政华 巩远发[1] TAN Zheng-hua1,2, GONG Yuan-fa1(1. College of Atmosphere Science, Chengdu University of Information Technology, Chengdu 610225, China;2. Benxi Meteorological Administration, Benxi 117000, Chin)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]辽宁省本溪市气象局,辽宁本溪117000

出　　处：《成都信息工程大学学报》2018年第1期78-83,共6页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金重大研究计划资助项目(91537214);国家自然科学基金资助项目(41775079;41275080)

摘　　要：2015年8月3-4日,辽宁东部地区发生了一次暴雨-大暴雨天气过程,为研究高低空急流对此次天气过程的影响机制,利用FNL再分析资料及中国自动站与CMORPH降水融合产品对这一天气过程进行了诊断分析。重点从高低空急流的配置、演变及其次级环流的垂直结构特征角度出发,分析了高低空急流在本次暴雨过程中的作用。结果表明,高低空急流上升支耦合是本次暴雨过程的重要抬升机制,高空急流次级环流的锋生作用为暴雨过程提供了触发条件和能量供应,低空急流的强烈水汽输送作用是强降水产生的重要原因。另外,长白山地形对水汽自南向北输送时的抬升作用也对降水增强起到了一定作用。From August 3 to 4 in 2015,the eastern part of Liaoning province has experienced a heavy rainstorm process.To explore the effects of upper and lower jet in this rainstorm,this research studied the heavy rain process by using FNL reanalysis data and CMORPH precipitation product. The study focused on the configuration,evolution and the secondary circulation of the high and low-level jet. The research also analyzed the effect of the high and low-level jet in this rainstorm. The results indicate that the ascending branch coupling of high-low jet induces intense ascending movement,what is more,it is an important triggers of the heavy rainstorm; frontogenesis of the secondary circulation that excited by upper jet provided energy for the heavy rainfall process; and the strong water vapor transport excited by low-level jet is an important reason for the heavy rainstorm. Moreover,the forced ascending of the Changbai Mountain terrain also played an important role in the heavy rainfall when the water vapor transport from the south to the north.

关 键 词：天气动力学 暴雨诊断 高空急流 低空急流 耦合作用 次级环流 

分 类 号：P442.1[天文地球—大气科学及气象学]