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doi:  10.12013/qxyjzyj2019-015
“5·12”南昌大暴雨过程水汽来源和输送特征

Analysis of moisture source and transport pathway of the “5·12” rainstorm in Nanchang
摘要点击 93  全文点击 58  投稿时间:2019-04-27  修订日期:2019-05-27
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基金:  中国气象局气象预报业务关键技术发展专项(编号:YBGJXM2018 02 12);中国气象局预报员专项(编号:CMAYBY2018 096);2017年江西省气象局重点科研项目“江西省降水格点预报客观订正技术研究”
中文关键词:  暴雨,水汽,来源,轨迹,模拟
英文关键词:  rainstorm  moisture  source  trajectory  simulate
           
作者中文名作者英文名单位
许彬Xu Bin江西省气候中心
熊秋芬Xiong Qiufen中国气象局 气象干部培训学院
姜晓飞Jiang Xiaofei中国气象局 气象干部培训学院
张玉婷Zhang Yuting衡水市气象局
引用:许彬,熊秋芬,姜晓飞,张玉婷.2019,“5·12”南昌大暴雨过程水汽来源和输送特征[J].气象与减灾研究,42(2):89-95
中文摘要:
      基于常规高空、地面观测资料,分析了2012年5月12日南昌大暴雨过程的环流背景和主要影响系统,并利用美国国家海洋和大气管理局(NOAA)开发的HYSPLIT模式和6 h一次的NCEP 1°×1°再分析资料模拟了此次大暴雨过程中气块的240 h后向轨迹。结果表明:1)此次大暴雨过程发生在500 hPa高度层低槽前,中低层有低涡、切变线和低空急流,200 hPa高度层风向分流辐散的环流背景下,且南昌位于地面冷锋前暖区中,有弱的不稳定能量等对流性降水特征。2)在模拟的南昌站6条气块后向轨迹中,有3条轨迹源自陆地,1条来自暴雨区周围,只有2条轨迹来自暖湿的海洋,其中各有3条轨迹来自对流层低层和中高层。3)此次大暴雨过程的水汽主要来自于对流层低层南海西南部向我国陆地的水汽输送和本地周围水汽的贡献,其次是位于我国西部大陆对流层中下层向东的水汽输送。
Abstract:
      Analysis of a rainstorm occurred on 12 May 2012 in Nanchang was carried out using conventional observations. 240 h backward trajectories ending at 08:00 BT 12 May 2012 was simulated based on HYSPLIT model and 6 h NCEP reanalysis data. The results showed that: 1) The rainstorm happened in front of 500 hPa troughs. Low pressure systems,shear lines and low level jets existed in low middle troposphere and divergence occurred at 200 hPa. The convective rainstorm was located in the warm sector in front of a cold front with small CAPE. 2) HYSPLIT model simulation showed that three air trajectories originated from land, one trajectory originated from the vicinity of Nanchang, and the other two trajectories originated from ocean. Among the six backward trajectories, three reached Nanchang through low level troposphere and the others passed through middle level and upper level troposphere. 3) In the rainstorm event, moistures were primarily provided by the low level troposphere above southwest of the South China Sea and local source of Nanchang, and secondly provided by the eastward moisture from low level and middle level troposphere western land of China.
主办单位:江西省气象学会 单位地址:南昌市高新开发区艾溪湖二路323号
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