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本文通过涡度收支平衡计算、卫星云图演变特征分析等手段,研究了8011、7614号近海台风的成因,指出在热带扰动近海发展成台风的过程中,散度项对台风形成有利,平流输送项对台风形成不利;积云对流输送项使气旋式环流向上发展,也是有利因素。同时指出,近岸这一因素可以构成近海台风发展的有利条件,特别是地理纬度较低、海拔不高、东西或南北跨度不大的半岛或岛屿,倒可以成为过境热带扰动系统内部积云对流迅速加强的有利地形。
This paper studies the causes of the offshore typhoons 8011 and 7614 by means of the calculation of the eddy balance, the evolution of satellite image, and other means. It is pointed out that in the process of tropical disturbed offshore development into a typhoon, the divergence term is favorable for typhoon formation and advection The formation of typhoon adversely affected the cumulus convection convection-type circulation to the upward development is also a favorable factor. At the same time, it is pointed out that the factor of nearshore can constitute a favorable condition for the development of offshore typhoons, especially the peninsula or island with low geography latitude, low elevation, little east-west or north-south span, and can be the cumulus convection within the tropical disturbance system of transit The rapidly strengthening favorable terrain.