摘要
对源自东风波的台风"灿都"结构变化特征进行了分析,结果表明:(1)引发"灿都"发展的东风波振动强度主要表现在对流层中层,其触发的南海季风区低层对流发展偏于东风波的东北-西南向波轴的西南端。(2)"灿都"中心结构耦合过程经历了中心附近上升运动从不对称向准对称的发展过程;"灿都"中心附近上升运动趋于准对称时也是"灿都"结构调整趋于完成,强度获得快速加强的时段。这可能是东风波加强成热带气旋发展演变的动力特征之一。(3)"灿都"在热带低压阶段的暖心不明显,对流层高层出现东风波暖心特征;由热带低压加强到热带风暴强度阶段,东风波暖心特征趋于消失,低层暖中心区发展;热带风暴到台风阶段的暖中心区由对流层中低层发展至高层,但暖心位置偏于"灿都"中心东侧。
The structure of the easterly waves that initiated typhoon Chanthu during its developing stage is analyzed. The results show that the easterly waves which evolved into typhoon Chanthu oscillated mainly in mid-troposphere and produced, on the southwest side of the easterly waves, low-level convective development in the South China Sea monsoon area. As it intensified into a typhoon, the distribution of ascending flows in the center of Chanthu went from being symmetric to being asymmetric, and when the ascending flow above the Chanthu center tended to be symmetric, Chanthu＇s structure also headed for interconsistency and the intensity of Chanthu got strengthened quickly. This may be one of the dynamical characters of tropical cyclones developing from easterly waves. Meanwhile, Chanthu＇s warm core was invisible in its stage of tropical depression while the easterly waves were still with a warm center in the upper troposphere. The warm core in the low-level troposphere developed and the warm center of easterly waves disappeared when Chanthu evolved from a tropical depression up to a tropical storm. During Chanthu＇ evolvement, the warm core developed from the low-middle to high troposphere but was located east of the Chanthu center.
出处
《热带气象学报》
CSCD
北大核心
2013年第1期93-98,共6页
Journal of Tropical Meteorology
基金
广东省科技厅技术研究与开发项目"南海热带气旋发生发展研究"(2009B080701108)
公益性行业(气象)科研专项"南海热带云团活动及其强风的监测和预报技术"(GYHY201106036)共同资助
关键词
天气学
台风“灿都”
结构特征
东风波
synoptic meteorology
tropical cyclone
structure characters
easterly waves
