摘要
采用NCEP/NCAR全球对流层1°×1°格点分析资料,选取2000年0008号台风Jelawat和0010号台风Bilis两个登陆台风个例,计算了这两个台风形成过程中切向平均风廓线、垂直速度场和位涡场,讨论了这2个台风形成过程中三维结构的变化特征。结果表明,在台风的形成过程中,最大风速增加,最大风速半径减小,垂直运动的范围从对流层中部向上向下扩张,垂直运动的强度增大;正的位涡在台风中心上空聚集;各物理量在对流层850 hPa、500 hPa的变化最为明显,在300 hPa相对较弱。
The three-dimensional structure of two landfalling typhoon, Jelawat and Bilis （ 2000 ）, during their formations is discussed based on the NCEP/NCAR global tropospheric 1° × 1°analysis,using tangential average wind profile, vertical velocity and potential vorticity. The results show that during the typhoons＇ formation, the radius of maximum wind decreased with increase in maximum wind velocity, and the vertical motion initially developed in the mid-troposphere gradually enhanced and expanded to the upper and lower levels, simultaneously. On the other hand, the positive potential vorticity gathered gradually over the typhoon center, and the physical variables changed more obvious at 850 hPa and 500 hPa than 300 hPa.
出处
《南京气象学院学报》
CSCD
北大核心
2007年第5期648-656,共9页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(40333028)
国家科技部项目(2005DIB3J104)
关键词
台风形成
三维结构
风廓线
垂直速度
位涡
typhoon formation
three-dimension structure
wind profile
vertical velocity
potential vorticity
