文章摘要
肖云,努尔夏提,马博涵,李欢欢,马中元.袁河流域极端降水事件成因分析[J].海洋气象学报,2022,42(3):77-87
袁河流域极端降水事件成因分析
Analysis on causes of extreme precipitation events in the Yuan River Basin
  
DOI:10.19513/j.cnki.issn2096-3599.2022.03.008
中文关键词: 极端降水  后向轨迹  水汽条件  动力条件
英文关键词: extreme precipitation  backward trajectory  water vapor condition  dynamic condition
基金项目:中国科学院战略性先导科技专项(A类-XDA19040202);国家自然科学基金项目(41975001);中国气象局气象关键技术集成与应用项目(CMAGJ2013M74);中国气象科学研究院开放课题(2012LASWB01);南京雷达气象与强天气开放基金项目(BJG201205);江西省气象科技面上项目(JX2021M12)
作者单位
肖云 新余市气象局,江西 新余 338025 克州气象局,新疆 克州 845350 
努尔夏提 克州气象局,新疆 克州 845350 
马博涵 克州气象局,新疆 克州 845350 
李欢欢 新余市气象局,江西 新余 338025 
马中元 江西省气象科学研究所,江西 南昌 330046 
摘要点击次数: 229
全文下载次数: 245
中文摘要:
   利用欧洲中期天气预报中心格点再分析资料和HYSPLIT模式对袁河流域5次极端降水天气过程的平均环流背景、主要影响系统、物理量场以及降水发生过程中的120 h气块后向轨迹特征进行分析。结果发现:(1)极端降水发生时,高层袁河流域处于南亚高压东侧辐散气流中,中层副热带高压位置适中,受584 dagpm线附近的西南气流控制,低层正好处于切变线上,且有强盛的西南气流向降水区输送能量和水汽。(2)物理量场上,袁河流域附近低层辐合、高层辐散,垂直速度场、水汽分布、水汽通量散度场都有利于该区域出现暴雨天气。(3)与袁河流域一般性暴雨的平均t-lnp图对比分析可见,极端暴雨的能量条件更好,降水对流性更强,水汽条件也更为充沛。(4)袁河流域极端降水上空的水汽路径总体上可以归纳为5条。来源于孟加拉湾附近、中南半岛南部和云南南部的西南水汽路径最多,占轨迹总数的59.5%;其次是来源于我国南海的南方路径,主要位于1 500 m以下,占轨迹总数的15.0%。
英文摘要:
   Using the reanalysis data of European Centre for Medium-Range Weather Forecasts (ECMWF) and the HYSPLIT model, the mean circulation background, main influence systems, physical quantity fields, and the 120-h backward trajectory characteristics of air parcel during 5 extreme precipitation processes in the Yuan River Basin are analyzed. The results are as follows. (1) When the extreme precipitation occurs, the Yuan River Basin is in the divergent airflow of the east side of the South Asia high at the upper level, controlled by the southwest airflow near the 584 dagpm isoline at the middle level due to the moderate position of the subtropical high, and located on the shear line at the lower level, with strong southwest airflow conveying energy and water vapor to the precipitation area. (2) In terms of physical quantity field, there are low-level convergence and high-level divergence near the Yuan River Basin, and the vertical velocity, water vapor distribution, and water vapor flux divergence fields are all conducive to the occurrence of rainstorm weather in this region. (3) Compared with the average t-lnp diagram of general rainstorm events in the Yuan River Basin, the extreme rainstorm has better energy conditions, stronger convective precipitation, and more abundant water vapor conditions. (4) In general, there are 5 water vapor trajectories for extreme precipitation in the Yuan River Basin. The southwest water vapor trajectories originated from the vicinity of the Bay of Bengal, the south of Indochina Peninsula, and the south of Yunnan are the most, accounting for 59.5% of the total trajectories; while the second is the south water vapor trajectories originated from the South China Sea, mainly located below 1 500 m, accounting for 15.0% of the total trajectories.
查看全文   查看/发表评论  下载PDF阅读器
关闭