| 闽西北两次致洪暴雨成因对比分析 |
| |
| 引用本文： | 张尾兰,蒋宗孝,廖才科.闽西北两次致洪暴雨成因对比分析[J].气象科技,2012,40(4):606-612. |
| |
| 作者姓名： | 张尾兰 蒋宗孝 廖才科 |
| |
| 作者单位： | 1. 福建省泰宁县气象局,泰宁,354400
2. 福建省三明市气象局,三明,365000 |
| |
| 摘 要： | 利用天气图资料、地面加密自动站资料和多普勒天气雷达探测资料等,对2010年6月18日和7月7日发生在闽西北山区的两场大暴雨至特大暴雨天气过程进行对比分析。结果表明:两场暴雨过程均是在高空槽东移引导冷空气南下和西南急流在福建省中北面的强风速辐合的相互作用下,有充分的水汽,较强的上升运动、不稳定的大气层结条件下产生的。副热带高压的位置、西南急流的水平宽度及前倾槽是影响大暴雨时间长短及范围大小的重要因素;暴雨的强度与低层辐合和高层辐散的抽吸效应、垂直上升运动等成正相关;暴雨区上空的水汽通量和水汽通量散度的最大中心比特大暴雨发生时间早,分析预报点上空的水汽变化特征对灾害天气的预报预警有指导作用;两次暴雨雷达回波均呈带状,且该强中心的长轴与移动方向基本一致,是两次暴雨的重要特征。
|
| 关 键 词： | 洪涝灾害 大暴雨 暴雨成因 |
| 收稿时间： | 2011/1/19 0:00:00 |
| 修稿时间： | 2011/6/29 0:00:00 |
Comparative Analysis of Causes of Two Flood Inducing Rainstorms over Northwestern Fujian |
| |
| Zhang Weilan,Jiang Zongxiao and Liao Caike.Comparative Analysis of Causes of Two Flood Inducing Rainstorms over Northwestern Fujian[J].Meteorological Science and Technology,2012,40(4):606-612. |
| |
| Authors: | Zhang Weilan Jiang Zongxiao and Liao Caike |
| |
| Institution: | 1 (1 Taining Meteorological Service,Fujian,Taining 354400;2 Sanming Meteorological Service,Fujian,Sanming 36500) |
| |
| Abstract: | Based on the conventional data,automatic weather station data,Doppler radar observational data,etc.,the causes of two heavy rainfall events occurred on 18 June and 7 July 2010 in the mountainous northwestern Fujian are compared and analyzed.The results show that both of the two processes happened under the circulation condition of the southward-moving cold air guided by the east-moving upper-level trough and the interaction of the southwest jet with the strong wind speed convergence over the northern and central Fujian,integrating with rich water vapor,strong vertical ascending motion,and unstable atmosphere stratification.The position of the subtropical high,the horizontal width of the southwest jet,and the forward-tilting trough are the important influencing factors of the duration and scope of the heavy rainstorm.The storm strength is positively correlated with the vertical ascending motion and the suction effects of lower-level convergence and upper level divergence,etc.The maximum center of water vapor flux and water vapor flux divergence over the storm zone appeared earlier than heavy rainfall.The variation of water vapor has indicative significance for the forecasting and early warning of disasters weather.The radar echoes of the two rainstorms exhibit a zonal distribution,and the moving direction of the strong radar echo intensity center is consistent with the long axis of the echo center. |
| |
| Keywords: | flood-inducing disaster heavy rainfall formation cause |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《气象科技》浏览原始摘要信息 |
| 点击此处可从《气象科技》下载免费的PDF全文 |
|
