2004年台风“艾利”与“米雷”路径异常变化分析  

Analysis of unusual changes in Typhoon Aere(2004) and Meari(2004)

作　　者：段晶晶[1] 吴立广[1] 倪钟萍 

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,南京210044 [2]浙江省台州市路桥区气象局,台州318050

出　　处：《气象学报》2014年第1期1-11,共11页Acta Meteorologica Sinica

基　　金：国家重点基础研究计划(973计划)项目(2009CB421500);江苏省普通高校研究生科研创新计划项目(CXZZ11_0598)

摘　　要：2004年西北太平洋上生成的台风"艾利"和"米雷"开始都是向西北方向移动,当快要进入东海时两个台风的路径均发生变化,"艾利"转向西南方向,形成倒抛物线形的路径,而"米雷"突然向东北方向转折。通过对这两个台风的不同时间尺度环境场及其与台风相互作用的分析表明,对于西南转向的"艾利",副热带高压(副高)西伸明显,台风位于副高的南侧,天气尺度风场对副高低频分量的涡度平流,使得台风西北侧出现负涡度,同时由于罗斯贝波能量频散,台风东南侧出现负涡度,与负涡度相联系的天气尺度异常环流导致台风西北侧和东南侧的天气尺度引导气流的作用相互抵消,台风主要在低频环流引导下向西南方向移动;对于突然向东北转向的"米雷",副高位置偏东,转向时刻只有东南侧增强的天气尺度西南风,天气尺度引导气流导致台风向东北转折。Typhoon Aere （2004）and Meari （2004）that formed in the western North Pacific in 2004 and tracked northwestward in a similar manner to each other until their tracks underwent changes over the East China Sea,where Aere （2004）moved southwestward and Meari （2004）took a sudden northeastward recurving track.This analysis shows that the interaction be-tween low-frequency circulation and typhoons are mainly responsible for the track changes.As Aere （2004）was located to the south of the subtropical high,it interacted with the subtropical high through the advection of the low-frequency vorticity by synoptic-scale flows,enhancing negative vorticity on the northwestern side of the storm and thus the northeastward steering flow therein.Meanwhile,the Rossby wave energy dispersion strengthened the southwestward steering flows on the southeast-ern side of Aere.As a result,the synoptic-scale steering became weak,and Aere moved southwestward due mainly to the steering of the low-frequency circulation.On the other hand,Typhoon Meari gradually approached the western side of the sub-tropical high,and the synoptic-scale winds on the southeastern side of the typhoon was strengthened,which made Meari took a sudden northeastward track with no enhanced northeastward steering flows like the Aere case.

关 键 词：台风 路径变化 天气尺度环流 副热带高压 

分 类 号：P457.8[天文地球—大气科学及气象学]