| 登陆强台风“凤凰”暴雨成因分析 |
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| 引用本文： | 高琦,徐明,赖安伟,汪小康.登陆强台风“凤凰”暴雨成因分析[J].安徽农业科学,2011,39(32):20053-20058,20104. |
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| 作者姓名： | 高琦 徐明 赖安伟 汪小康 |
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| 作者单位： | 1. 武汉中心气象台,湖北武汉,430074
2. 中国气象局武汉暴雨所,湖北武汉,430074 |
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| 基金项目： | 中国气象局武汉暴雨所开放基金项目(0810) |
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| 摘 要： | 利用常规观测资料、NCEP 1°×1°6 h再分析资料、NCEP/NCAR地表潜热通量一日4次再分析资料以及TBB资料等,对2008年第8号强台风＂凤凰＂登陆引起的暴雨进行了深入的机理分析。结果表明,充沛的水汽以及层结不稳定为暴雨的发生提供了有利的水汽和热力条件;高层有明显的辐散,低层有明显的辐合,且从低层到高层伴随着很强的垂直上升运动,为暴雨的发生提供了有利的动力条件;螺旋度的大值中心的演变基本反映了台风中心的移动方向,而强降水一般发生在正螺旋大值中心的右侧,且梯度大的一侧比梯度小的一侧降水强度更大;非地转湿Q矢量辐合中心对应未来12 h强降水的发生区,对判断台风在陆上的运动、维持也有一定的意义;地表潜热通量在此次暴雨过程的各个时段均为正值,其向上输送和强弱变化对台风强度的维持有一定的指示意义。
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| 关 键 词： | 强台风“凤凰” 螺旋度 非地转湿Q矢量 暴雨成因 |
Mechanism Analysis of Rainstorm Cause Influenced by Strong Typhoon "Fenghuang" |
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| Institution: | GAO Qi et al(Wuhan Central Meteorological Observatory,Wuhan,Hubei 430074) |
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| Abstract: | By dint of the routine observation data,NCEP1°×1° 6h reanalysis data,NCEP/NCAR latent heat flux four times a day and TBB data,rainstorm caused by No.8 strong typhoon "Fenghuang" in 2008 was expounded.Result suggested that the abundant water vapor and unstable layer provided favorable water vapor and heat for the generation of rainstorm.There was distinct high-level divergence,and lower-level convergence,as well as strong vertical ascent motion which probably provided the favorable dynamic condition for this event.The maximum value of helicity variation basically reflected the direction of typhoon movement.Heavy Rainfall area was on the right side of the large numerical center,and stronger rainfall lied at an area of larger gradient.In the future12 hours,there was a good relation between the area of torrential rainfall and the negative center of divergence of ageostrophic wet Q—vector,which was useful for the forecast of the movement maintenance of typhoon over land.Latent heat flux was right all along the rainstorm process.The surface latent flux in each period of this rainstorm process was positive.Its upward transportation and intensity indicated the maintenance of typhoon intensity. |
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| Keywords: | Strong typhoon "fenghuang" Helicit Ageostrophic wet Q—vector Rainstorm causes |
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