摘要
利用NCEP再分析资料和常规观测资料等,对2012年8月8—10日"海葵"台风引发的景德镇地区特大暴雨过程的原因进行分析。结果表明,因北方高压脊阻挡,台风低压在安徽省南部地区长时间停滞,导致景德镇地区出现持续性的强降水。强降水发生期间,高层辐散,低层辐合,上升运动深厚而强盛。台风登陆后在向西偏北方向行进的过程中,中心西侧有弱冷空气补充,大气层结由对流稳定变为对流不稳定,景德镇地区的强降水的性质也随之发生改变。对应两次暴雨极值的出现,景德镇地区高、低空的动力、热力、水汽和不稳定条件,均有利于降水的加强。向西南开口的"簸箕"地形有利于西南暖湿气流的抬升,从而导致此次台风暴雨的加强。
Based on the conventional observation data and NCEP reanalysis data, the heavy rain process caused by typhoon Haikui in Jingdezhen was analyzed. The conclusions are as follows： The typhoon depression was residing in the southern area of Anhui province due to a stable ridge in the north, which resulted in persistent precipitation. During the term of heavy precipitation, the stream field presented divergence at high level and obvious convergence at low level. Cold air supplement led the atmospheric stratification from convective stability to convective instability. During the two terms of rainstorm extreme, the physical fields of dynamical, thermal,vapor and unstable conditions were coinciding with the occurrence of peak rainfall. In addition, the effect of topography was conducive to water vapor uplift, which led to heavy rain enhancement.
出处
《气象与减灾研究》
2013年第3期35-42,共8页
Meteorology and Disaster Reduction Research
基金
中国气象局预报员专项项目(编号:CMAYBY2013-037)
关键词
台风
暴雨
低压环流
物理量
地形
Typhoon Haikui
Torrential rain
Circulation of vortex
Physical fields
