登陆台风与其外围暴雨的相互作用

THE INTERACTION BETWEEN THE LANDED TYPHOON AND ITS EXTERNAL HEAVY RAIN

中文摘要:

      本文对8116号登陆台风及其环境和外围暴雨区分别作了动能平衡的诊断分析,结果表明,动能制造是三个区域动能平衡的主要能源,动能水平辐散和摩擦消耗则是主要能汇。在台风登陆减弱过程中,暴雨区的动能增加。台风区上层动能水平辐散呈显著的不对称型。台风右侧次天气尺度强风带起了向暴雨区输送动能使暴雨得到发展的作用。暴雨发生后,通过暴雨区北界向环境输送动能,于是,台风辐散的动能通过暴雨区最后输送给环境。这种动能传递过程可能是台风与环境大气相互作用引起台风衰减的机制之一。

英文摘要:

      In this paper, the kinetic energy balance for a landed typhoon labelled 8116 and its environment as well as the external heavy rain area has been diagnostically examined. The results show that the kinetic energy production term is the major energy source in all the three regions, while the kinetic energy horizontal divergence term and the friction term are the major sinks. The increase of kinetic energy in the external heavy rain area is closely connetted with the typhoon weakening process. The horizontal divergence at the upper level of the typhoon displays asymmetrical distribution. A subsynoptic-scale strong wind band at the right flank of the typhoon plays important roles in transporting the kinetic energy into the external heavy rain area and stimulating the development of the heavy rain. Since the occurrence of heavy rain the typhoon kinetic energy was transported into environment through the north boundary of the heavy rain area, so that the kinetic energy dispersed from the typhoon would be finally transported into the environment. This kinetic energy transporting process in associated with the interaction between typhoon and its environment seems to be one of the mechanisms leading to the decay of the typhoon.