韩桂荣 ,何金海 ,樊永富 ,邓华军. 2005. 变形场锋生对0108登陆台风温带变性和暴雨形成作用的诊断分析[J]. 气象学报, 63(4):468-476, doi:10.11676/qxxb2005.046
变形场锋生对0108登陆台风温带变性和暴雨形成作用的诊断分析
THE TRANSFIGURATION FRONTOGENESIS ANALYSESON 0108 LANDFALL TYPHOON EXTRATROPICALTRANSITION AND HEAVY RAIN STRUCTURE
投稿时间:2004-03-18  修订日期:2004-11-05
DOI:10.11676/qxxb2005.046
中文关键词:  台风登陆,变形场锋生,温带变性,非地转风
英文关键词:Landing typhoon, Extratropical transition,Transfi guration frontogenesis,Geostrophic departure.
基金项目:国家自然科学基金重点项目(40333025)
作者单位
韩桂荣 南京信息工程大学, 南京210044
江苏省气象台, 南京210008 
何金海 南京信息工程大学南京210044 
樊永富 江苏省气象台南京210008 
邓华军 江苏省气象台南京210008 
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中文摘要:
      文中利用 MM5模式对0108(桃芝)台风温带变性特征及暴雨的发生发展机制进行了诊断分析。分析表明0108(桃芝)台风登陆后其大风区向外扩展,中心区以外的气压仍有下降。由于锋面的斜压作用其温度场结构发生了明显变化,由对称的暖心结构演变为半暖半冷的温带气 旋非对称结构,相对应的高度场、流场特征亦表现出非对称结构。通过计算变形向量、锋生 函数及非地转风的分布,发现在锋生函数中变形项所起作用比散度项和倾斜项要早、要大, 对台风温带变性有重要的作用。而锋生结果加强了风场的非地转性并强迫出锋面垂直次级环 流,造成强烈的辐合上升运动,引起台风暴雨的增幅。
英文摘要:
      A heavy rain process over Jiangsu province caused by typhoon 0108(Toraji) was st udied with the aid of MM5 model. By the analyses of its height,temperature and winds field features, it was found that after typhoon landfall, the center press ure increased but its gale areas still have expending tendency, formatting stron g wind transfiguration. Due to the frontal barocline,its temperature field stru cture evolved from symmetric warm center to asymmetric half cold and half warm e xtratropical cyclone. And the winds field also has such asymmetric structure. After calculation of every items distribution of frontogenesis function, it was found that in the early stage of raining the effects of transfiguration item on frontogenesis function was earlier,larger than the others, played important role to typhoon's transition. The result of frontogenesis forced strong convergence, upward motion and geostrophic departure. Then the 0108 typhoon was re intensif ication. In the right back area of upper southwest Jet there existed obviously g eostrophic departure positive divergence, which developed and maintained heavy rainfall.
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