气象2017，Vol.43Issue(12)：1507-1516,10.DOI:10.7519/j.issn.1000-0526.2017.12.006
承德市两次局地性短时暴雨过程的中尺度特征对比分析
Comparative Analysis on Mesoscale Characteristics of Two Local Short-Time Severe Rainstorm Processes in Chengde
摘要
Abstract
On 17 June and 15 July 2014,two continuous local short-time severe rainstorms occurred inChengde as a result of cold vortex.The hourly rainfalls were 39.6 and 66.1 mm · h-1 respectively and the maximum 10 min rainfalls were 15 and 18 mm correspondingly.Based on conventional observation data,5 -10 min automatic weather station data,Doppler radar data,satellite images and NCEP reanalysis data,the mesoscale characteristics of the two short-time severe rainstorms are analyzed in this paper.The minute precipitation observation reveals that in the 17 June rainstorm process,10 min rainfall showed a double peak type distribution as time going on,lasting about half an hour.In the 15 July rainstorm process,it showed a single peak type,which lasted less than 1 h.Both of the two local heavy rains were generated with the upper cold vortex circulation,and their triggering system is the ground mesoscale convergence center (convergence line).The precipitation peak was associated with southeast wind or the increased wind speed.The 6 m · s-1 southeast winds were favorable for the heavy rains.Satellite data show that the direct influence system of the rainstorm on 17 June 2014 was the meso-β scale convective system.The heavy precipitation was corresponding to the low area of TBB.The severe convective system on 15 July 2014 performed as the meso-γ scale,corresponding to the large gradient area of TBB.The rainstorm on 17 June 2014 corresponded to the merge enhancement of convective cell echoes,which had a horizontal scale of near 20 km,lasting about half an hour with the echo intensity of 65 dBz.The rainstorm on 15 July 2014 was shown that a number of convective cell echoes passed through the urban area of Chengde in order,due to the "train effect",and the convective cell echoes had a number of horizontal scales of less than 5 km,living less than 1 h with echo intensity 55 dBz.In two precipitation processes,the occurrence time of inverse wind area was corresponding to that of the short-time strong rainfall,the duration of inverse wind area was longer,and the rainfall intensity is also stronger.关键词
局地性短时暴雨/中尺度特征/对比分析Key words
local short-time rainstorm/mesoscale characteristics/comparative analysis分类
天文与地球科学引用本文复制引用
王宏,王丛梅,高峰,高艳春,王万筠,胡赛安,吴显春..承德市两次局地性短时暴雨过程的中尺度特征对比分析[J].气象,2017,43(12):1507-1516,10.基金项目
国家自然科学基金项目(41575049)和河北省气象局强对流创新团队共同资助 （41575049）
