0814号台风“黑格比”快速移动及造成广西持续大范围暴雨成因分析

作者：陈见  高安宁  罗建英  李生艳  董良淼

单位：广西气象台, 南宁, 530022

关键词：0814号台风“黑格比” 快速移动 暴雨成因 分析

分类号：研究分析

出版年·卷·期（页码）：2010·2010·第一期（1-7）

摘要：

利用T213、ECMWF数值预报资料和热带气旋历史资料,对0814号强台风"黑格比"快速移动以及造成广西持续大范围暴雨的成因进行分析,表明造成台风"黑格比"快速移动的主要原因是:(1)副热带高压突发性加强西伸,脊线稳定维持在30°N附近,台风与副高脊线之间的东风带宽广且深厚,风速≥12m/s,急流轴随台风从东向西递进;(2)赤道地区的西南气流正处于弱和相对稳定的时期,无明显能量补充到台风环流中;(3)台风结构尺度小,uv分量分析显示,u分量的东西风、v分量的南北风差值极小,环流风对称,即使登陆后还保持这一特点;(4)无"双台风"或多台风的间接影响。造成广西大范围暴雨的主要原因是:(1)台风"黑格比"进入广西内陆后,中心涡度值维持在11.5×10-5S-1以上,强度偏大;(2)台风"黑格比"在广西西南部移速减慢,维持较强的水汽辐合,进入越南前,中心附近的水汽通量散度仍有-60×10-5S-1,与通常台风相比,水汽辐合明显偏强。

By using the ECMWF and T213 data with the historical tropical cyclone data, the causality of the large-range continuous heavy rain event by the fast-moving typhoon "Hagupit"(No.0814)are analyzed. It indicates that there are four reasons for the typhoon "Hagupit" moving fast:(1)the subtropical high suddenly strengthened westward and its axis of ridge moved to the area near 30°N, which made the east wind belt wide and deep between typhoon and subtropical high and the axis of east wind jet ≥12m/s propagated from east to west;(2)The southwest wind stream near the equator was weak and in a stable period so that there was no supplementary energy to the typhoon;(3)the scale of this typhoon was small and it appeared as a symmetric wind stream with the small balances of the u wind and the v wind until its landing;(4)There are neither binary typhoons nor multiple typhoons indirect impact. And the main reasons of the formation mechanisms of the heavy rain event are as follows:(1)the centre vorticit value of the typhoon maintained 11.5×10-5S-1,which was more than the normal after it entered Guangxi Province;(2)The typhoon "Hagupit" moved slowly when it passed the south-west of Guanxi but still maintained strong water vapor convergence with 60×10-5S-1 near the TC center,which is also stronger than the normal.

参考文献：

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