作　　者： ; ;

机构地区： 广州市气象局

出　　处： 《热带气象学报》 2010年第3期309-316,共8页

摘　　要： 利用常规气象观测资料、NCEP/NCAR-2再分析资料和NOAA的向外长波辐射(OLR)资料,比较分析了近60年来登陆我国大陆的两个4月台风9902(LEO,利奥)和0801(NEOGURI,浣熊)的生成发展背景、路径变化和风雨分布特征。结果表明:(1)4月台风"利奥"和"浣熊"均是在La Ni?a事件下发生,在此背景下南海地区偏强的对流活动、弱的水平风垂直切变和高层辐散条件有利于4月台风的形成;"利奥"由季风低压发展而成,"浣熊"由东风波演变而成;(2)"利奥"路径多变与大陆冷高压强盛和副热带高压偏弱多变有关;"浣熊"移动则受偏强且稳定的副高环流影响,路径以稳定西北行为主;(3)"利奥"和"浣熊"登陆时强度和地形条件相似,热带气旋带来的强降水量级差异主要受水汽输送和动力抬升大小及持续时间的影响。 The conventional observations data,NCAR/NCEP-2 reanalysis data,and NOAA OLR data are taken to investigate the different characteristics of April typhoons Leo and Neoguri.The results show that Leo and Neoguri occurred during the La Nina events.Strong convective activity,weak vertical wind shear and high level divergence were in favor of the formation of April typhoons.Leo originated from a monsoonal depression and Neoguri from the easterly wave.The meandering moving track of Leo attributed to the strong northeast monsoon and a weak and varying subtropical high;the steady moving track of Neoguri was affected by a strong and stable subtropical high.Leo and Neoguri had similar terrain condition and intensity during landfall but were different in precipitation as vapor transportation and duration of kinetic uplifting resulted in apparent discrepancies between Leo and Neoguri.

关 键 词： 月台风 形成机理 事件 移动路径 台风降水

领　　域： [天文地球]