热带气象学报2017，Vol.33Issue(3)：357-367,11.DOI:10.16032/j.issn.1004-4965.2017.03.007
“15.7”广西超长持续性暴雨过程多尺度特征分析
ANALYSIS OF MULTI-SCALE CHARACTERISTICS OF A JULY 2015 PERSISTENTLY LONG HEAVY RAINFALL IN GUANGXI
摘要
Abstract
Based on multi-source data,the multi-scale feature of an persistently long heavy rainfall processin Guangxi in July 2015 is analyzed through comprehensive diagnosis and analysis,and the results are shown as follows:(1) A South Asia high experienced an establishment that featured twin bodies,and a subtropical long wave trough was conducive to the southward advancement of cold air and establishment of a southwest jet stream.In the El Nino state,a West Pacific subtropical high was stronger and its position was more to the west and south as compared with the normal,favoring the transportation of warm and moist air flow to Guangxi.The transition layer of the South Asia high steadily confronted with the subtropical high,favorable for the intersection in Guangxi of cold and wet air;(2) The influence systems of this process were an upper trough,a shear line,a cold front,a low-level jet,a monsoon trough and a low vortex.The heavy rain process went through four stages:a warm sector ahead of a front,frontal surface,the strengthening of an upper-level trough and a monsoon trough and a vortex;(3) For the type of being ahead of a front,the rainstorm happened from the formation to the weakening of MCC,the radar echo was of a bow-type,and the convection was strong;For the front type,the rainstorm happened in the cloud band after the MCC weakened,the radar echo changed from a bow-type to linear,and the convection was weakening.For the type of a strengthening upper-level trough,the rainstorm was caused by a linear cloud system,and the radar echo was enhancing.For the type of monsoon trough and vortex,the rainstorm was caused by a vortex cloud system,and the radar echo was strong;(4) Heavy rainfall occurred at the leeside of Yunnan-Guizhou Plateau,in the northwest of Guangxi with trumpet shaped topographic convergence,on the coast with the land-sea distribution difference and in southeast of Guangxi with a windward slope of mountains.Thus it could be seen that this long duration rainstorm process was caused by the interaction of multi-scale weather systems,heavy rainfall happened where there was favorable large scale circulation and frequent meso-small scale systems,and the terrain was obviously conductive to the increase of rainfall.Through deep understanding of the scale characteristics of the continuous rainstorm,the ability of forecast for the this kind of weather can be improved.关键词
广西/多源气象资料应用/持续性暴雨/尺度特征分析/诊断分析Key words
Guangxi/application of multi-source data/persistent heavy rainfall/scale characteristics analysis/diagnostic analysis分类
天文与地球科学引用本文复制引用
刘国忠,赖珍权,钟祥平,黄荣,翟丽萍..“15.7”广西超长持续性暴雨过程多尺度特征分析[J].热带气象学报,2017,33(3):357-367,11.基金项目
中国气象局华南区域气象中心科技攻关项目(GRMC2014M13) （GRMC2014M13）
中国气象局国家卫星气象中心项目(201401KY002/02-3) （201401KY002/02-3）
广西自然科学基金项目(2014GXNSFAA118299) （2014GXNSFAA118299）
中国气象局预报员专项(CMAYBY-055)共同资助 （CMAYBY-055）
