气象2018，Vol.44Issue(4)：500-510,11.DOI:10.7519/j.issn.1000-0526.2018.04.003
2017年5月7日广州特大暴雨微物理特征及其触发维持机制分析
Microphysical Characteristics,Initiation and Maintenance of Record Heavy Rainfall over Guangzhou Region on 7 May 2017
摘要
Abstract
An extremely heavy rainfall event occurred in Guangzhou City on 7 May 2017.The record-break-ing heavy precipitation caused severe property damage.To investigate the reasons/mechanisms responsible for the severe rainfall,a detailed observation analysis was performed in this study,based on the dataset collected by ground-based Doppler radars,two-dimensional video disdrometer (2DVD),microwave radio-meter and wind-profiling radar.The research results show that the ambient conditions prior to this event are characterized by small value of convective inhibition (CIN),low lifting condensation level (LCL), moderate convective available potential energy (CAPE),deep warm layer,and moist southerly flow.From midnight to dawn of 7 May 2017,initial convection was generated mainly by the terrain-blocked southerly flow,leading to the formation of quasi-stationary rainbands.From sunrise to early morning,new convec-tive cells were repeatedly triggered along the precipitation-induced outflows boundary (i.e.,back building process) and were continuously propagated backward(i.e.,"echo training").The observaiton of 2DVD further suggests that the surface heavy precipitation was composed of a high concentration of small rain-drops and a few large raindrops.This microphysical information indicates that the high-precipitation-effi-ciency warm rain process was the main microphysical mechnism responsible for the heavy rainfall.This ar-gument is supported with the low-centroid cumulonimbus structures observed by Doppler radar.It sug-gests that the continuously intensifying southerly flow played an important role in sustaining the convective system and producing the local heavy rainfall.关键词
广州"5·7"特大暴雨/高降水效率低质心云团/暖性降水/后向建立Key words
the 7 May 2017 Guangzhou extreme rainfall/low centroid and high precipitation efficiency cu-mulonimbus/warm rain/back building分类
天文与地球科学引用本文复制引用
傅佩玲,胡东明,张羽,李怀宇,高美谭,周芯玉..2017年5月7日广州特大暴雨微物理特征及其触发维持机制分析[J].气象,2018,44(4):500-510,11.基金项目
广州市产学研协同创新重大专项(201704020169)、广东省科技计划项目(2017ZC0402)和中国气象局预报员专项(CMAYBY2018-052)共同资助 （201704020169）
