A　STUDY　ON　TYPHOON　MOVEMENT　PARTⅡ：　DYNAMICAL　ROLE　OF　SMALL　TOPOGRAPHY　AND　THE　PLANETARY　BOUNDARY　LAYER  

作　　者：贺海晏 杨平章 

出　　处：《Journal of Tropical Meteorology》1996年第2期113-118,共6页热带气象学报（英文版）

摘　　要：The dynamic effects of small topography (in the sense of the characteristic height of the topography as compared with the vertical thickness of the system of motion) and the Ekman pumping caused by the frictional convergence in the bounary layer on the motion of a typhoon have been qualitatively discussed in this part based on the governing equation of typhoon motion derived in part I of this paper. The results show that a topographical ridge tends to attract the typhoon approaching it and this explains at least partially the phenomenon that the typhoon over the western Pacific tends to accelerate just before their making land fall over the coastal areas. It is also shown that the Ekman pumping at the top of the boundary layer favors the typhoon acceleration along the local steering current.ＡＳＴＵＤＹＯＮＴＹＰＨＯＯＮＭＯＶＥＭＥＮＴＰＡＲＴⅡ：ＤＹＮＡＭＩＣＡＬＲＯＬＥＯＦＳＭＡＬＬＴＯＰＯＧＲＡＰＨＹＡＮＤＴＨＥＰＬＡＮＥＴＡＲＹＢＯＵＮＤＡＲＹＬＡＹＥＲ￥ＨｅＨａｉｙａｎａｎｄＹａｎｇＰｉｎｇｚｈａｎｇ（Ｄｅｐａｒｔｍｅｎｔｏｆ...

关 键 词：TYPHOON MOVEMENT topographical FORCING EKMAN steering current 

分 类 号：P444[天文地球—大气科学及气象学]