蒋义芳,李超,曹璐,刘安宁,金晓霞.热带低压倒槽引发江苏东部大暴雨过程分析.气象科学,,(): JIANG Yifang,LI Chao,CAO Lu,LIU Anning,JIN Xiaoxia.Analysis on heavy rainfall event tiggered by inverted typhoon trough in the northeast region of Jiangsu province.Journal of the Meteorological Sciences,,():
热带低压倒槽引发江苏东部大暴雨过程分析
Analysis on heavy rainfall event tiggered by inverted typhoon trough in the northeast region of Jiangsu province
投稿时间:2012-11-21  修订日期:2013-04-24
DOI:10.3969/2013jms.0044
中文关键词:  特大暴雨  热带低压倒槽  水汽辐合  气旋性环流  多普勒天气雷达
英文关键词:Heavy rainfall  Tropical depression inverted trough  Moisture convergence center  Cyclonic circulation  Doppler radar
基金项目:江苏省气象科研开放基金资助项目(200910);国家自然科学基金青年项目(41105077);公益性行业(气象)科研专项(GYHY201006004)
作者单位E-mail
蒋义芳 江苏省气象台, 南京 210008 jyf65@sina.com 
李超 江苏省气象台, 南京 210008  
曹璐 江苏省气象台, 南京 210008  
刘安宁 江苏省气象台, 南京 210008  
金晓霞 江苏省气象台, 南京 210008  
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中文摘要:
      利用常规观测资料、NCEP 1°×1°再分析资料、加密自动观测站资料、连云港风廓线雷达和多普勒天气雷达资料等,对2012年8月10日江苏东北部地区特大暴雨过程进行了分析。结果表明:台风"海葵"登陆后在安徽东南部减弱成热带低压,低压倒槽与高空低槽的结合,是产生这次特大暴雨的天气背景。特大暴雨发生在大气层结极不稳定区域,同时具有水汽强辐合,对流层、低层强辐合、高层强辐散的环境场特征。散度场的垂直分布特征变化先于降水强度的变化;冷空气从低层开始入侵,并向中高层渗透,触发了不稳定能量的释放。地面中尺度辐合线的长时间维持,是这次东北部地区特大暴雨产生的直接原因。平均径向速度产品揭示的风向风速辐合、气旋性环流、低空急流及暖平流等的环境场特征,为短临预报中判断强降水发生及维持提供了依据。
英文摘要:
      Based on convention observation data、NCEP 1°×1° reanalysis data,ground-based observation data, wind-profile radar in Lianyungang and doppler weather radar data, heavy rainstorm process on August 10, 2012 was analyzed. It indicates that after landing in the southeast Anhui, typhoon "HAIKUI" weakened into a tropical depression. The combination of inverted trough and upper-level trough is proved to be the background of they heavy rainstorm happened in the northeastern Jiangsu. Its ambient field appears characteristics like extreme unstable atmospheric stratification, moisture convergence center, convergence trough, upper-level divergence center and powerful ascending motion. Cold air penetrated into the meso-sphere and upper-level from the lower atmosphere, which triggered the release of instable energy. The lasting of medium-scale convergence line is the main reason of this heavy rainfall event. Wind convergence , cyclonic circulation , mesocyclone signature ,low-level jet, warm advection and greater radial wind field are revealed in the medium-scale environmental field signature during the torrential rain. According to this, the occurrence and maintaining of heavy precipitation in nowcasting can be predicted.
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