环流场及结构变化对1214热带气旋“天秤”西折路径影响  

Circulation structure change impact on the westbound track of typhoon Tembin(1214)

作　　者：魏新[1] 王力群[1] 李海宁[1] 姜旻[1] 

机构地区：[1]中国卫星海上测控部,江苏江阴214431

出　　处：《海洋预报》2014年第3期72-79,共8页Marine Forecasts

摘　　要：利用NCEP全球数据同化系统(GDAS)1°×1°分析资料,对1214号热带气旋"天秤"台风移动路径西折原因进行了分析。结果表明,500hPa中高纬度环流调整后转为纬向环流,环境场由弱转强是"天秤"台风北上过程中移动路径西折的根本原因;300hPa等压面上青藏高压的变化对"天秤"台风移动路径有一定的影响,当300hPa等压面上青藏高压中心偏西、东亚维持低值系统时,"天秤"台风移动路径偏北,青藏高压加强东伸,"天秤"台风移动路径西折;"天秤"台风在500hPa等压面上等位势高度梯度场从北上过程的基本对称结构转为不对称结构,对预报"天秤"台风移动路径西折有重要指示作用。Based on the 1 °× 1 ° analysis data from NCEP global data assimilation system （GDAS）, the cause of No. 1214 typhoon Tembin＇s westbound track was analyzed. The results show as follow： firstly, the middle-high latitude circulation pattern on 500hPa turning into zonal circulation, and the weak environment field converting to strong lead to the westward turning track primarily; secondly, the Tibetan High has a significant effect on the track of Tembin. When the Tibetan High locates in the west, and a low pressure system maintains in East Asia, Tembin moves northward. Conversely, when the Tibetan High strengthens and extends to eastward, Tembin turns westward. Thirdly, the changing of geopotential height gradient on 500hPa from symmetrical into asymmetrical structure plays an important role on the forecasting of Tembin＇s westbound track.

关 键 词：环流变化 西折路径 青藏高压 不对称结构 

分 类 号：P444[天文地球—大气科学及气象学]