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

He Haiyan; Yang Pingzhang

Abstract:

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.

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He Haiyan, Yang Pingzhang. A STUDY ON TYPHOON MOVEMENT PARTⅡ:DYNAMICAL ROLE OF SMALL TOPOGRAPHY AND THE PLANETARY BOUNDARY LAYER [J]. Journal of Tropical Meteorology, 1996, 2(2): 113-118.

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

Department of Atmospheric Sciences, Zhongshan University, Guangzhou, 510275

Received Date: 1994-04-13

Rev Recd Date: 1994-07-20

Abstract: 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.

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Reference (10)

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[5]	He Haiyan,1995. A study on typhoon movement,Part I:the effect of diabatic heating and horizontal temperture distribution,Journal of Tropical Meteorology, 1:12-22.
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A STUDY ON TYPHOON MOVEMENT PARTⅡ:DYNAMICAL ROLE OF SMALL TOPOGRAPHY AND THE PLANETARY BOUNDARY LAYER

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