文章摘要
袁河流域极端降水事件成因分析
Analysis of the causes of extreme precipitation events in Yuanhe River basin
投稿时间:2021-08-31  修订日期:2022-04-28
DOI:
中文关键词: 极端  轨迹  水汽  动力
英文关键词: Extreme  Trajectories  Vapor  Dynamics
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
作者单位
马中元  
摘要点击次数: 95
全文下载次数: 0
中文摘要:
   利用欧洲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120h气块后向轨迹特征进行了分析,发现:(1)极端降水发生时,高层袁河流域处于南亚高压东侧和高空急流出口右侧辐散气流中,中层副高位置适中,受584线西南气流控制,低层正好处于切变线上,且有强盛的西南气流向降水去输送能量和水汽;(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、水汽通量散度场以及平均层结特征都有利于该区域出现暴雨天气;(3)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1500m以下,占轨迹总数的15%。
英文摘要:
   Based on the reanalysis data of European central grid point and the HYSPIT model, the average circulation background, main influence system, physical field and 120h backward trajectory characteristics of the five extreme precipitation weather processes in the Yuanhe River Basin were analyzed, and it was found that: (1) When extreme precipitation occurs, the upper Yuanhe River Basin is in the divergent airflow on the east side of SAH and the right side of the outlet of upper-level jet stream. The middle subtropical high is in a moderate position and is controlled by southwest airflow of 584 line. The lower level is just on the shear line, and there is strong southwest airflow to transport energy and water vapor to the precipitation. (2) In the physical quantity field, the vertical velocity field, water vapor distribution, water vapor flux divergence field and average stratification characteristics are conducive to the occurrence of heavy rain weather in this region. (3) Generally, the water vapor paths over the Yuanhe River Basin can be divided into five. The southwest water vapor paths from the Bay of Bengal, the south of Indo-China Peninsula and the south of Yunnan are the most, accounting for 59.5% of the total trajectories, followed by the south water vapor paths from the South China Sea, which are mainly located below 1500m, accounting for 15% of the total trajectories.
View Fulltext   查看/发表评论  下载PDF阅读器
关闭