TCM－90现场科学试验台风FLO“β陀螺”“通风流”非对称动力结构特征

THE ASYMMETRIC AND DYNAMIC STRUCTURE OF THE “β-TOP” DIPLOE AND “VENTILATION FLOW” OF THE TARGET TYPHOON FLO DURING TCM-90 FIELD EXPERIMENT

中文关键词:  “β陀螺”  “通风流”  辐散－辐合偶极子  非对称结构

英文关键词:“β-top”  “Ventilation flow”  Divergence-convergence dipole  Asymmetric structure

中文摘要:

      采用TCM-90台风现场科学试验期间加密观测资料,揭示出目标台风Flo非对称动力、热力结构及其转向运动的特征,尤其通过分离处理的偏差场,突出了TCM-90现场试验有关飞机下投(dropsonde)加密探测资料对台风Flo内部非对称结构物理图象的描述,提出了实际台风动力结构存在类似Gray认为的非对称偶极子型,即中低层“β陀螺”偶极子型(β-top dipole),及其“通风流”(Ventilation flow)特征,高层辐合-辐散结构的变形偶极子系统概念模型,并认为这类三维非对称结构对台风运动(转向现象)有一定“引导”作用。文中还强调了“β陀螺”偶极子非对称结构的垂直差异,并揭示了目标台风暖心结构及其热力非对称结构特征。

英文摘要:

      Using intense observational data during TCM-90 field experiment, the asymmetric dynamic and thermodynamic struture and its characteristics relating to typhoon recurvature movement are revealed. Based on the decoposition processing of TCM-90 target typhoon data. the actual characteristics of TC's asymmetric structure, namely,"β-top" dipole and "ventilation flow" systems are obtained, which are quite similar to results of Gray W^[5] (1991).Moreover. it is found that by analyzing the upper level streamline field. another kind of divergence-convergence dipole.pattern structure is related to typhoon motion. The present paper also proposed the concepts of the vertical difference of the "β-top" dipole dynamic struture and asymmetric thermodynamic structure. the typhoon "warm core" can be described by the analysis of TCM-90 target typhoon intense observational data.