THE DYNAMICS OF MAINTAINING THE TROPICAL CYCLONE 9012 AFTER ITS LANDING

Liang Li; Wu Zhiwei; Yan Guanghua

Abstract:

Using 2.5 ×2.5 winds and pressure grid data, the angular momentum budgets are studied in this paper for TC 9012 (Yancy) which was kept active 65 hours after land fall.It is found that the inland TC 9012 moved into the center of a relatively stable saddle, in which large amount of humid air was entrained into the storm from the southerly jet at low level to bund up the energy of latent heat, the weak cold air coming from the north provided it with baroclinic energy, while the vorticity transfer of geostrophic angular momentum on the radius 4°-8°from the cyclone center at upper troposphere and the input of cyclonic angular momentum produced by the βterm are immediate factors maintaining the central pressure and maximum winds.

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Liang Li, Wu Zhiwei, Yan Guanghua. THE DYNAMICS OF MAINTAINING THE TROPICAL CYCLONE 9012 AFTER ITS LANDING [J]. Journal of Tropical Meteorology, 1996, 2(1): 35-45.

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THE DYNAMICS OF MAINTAINING THE TROPICAL CYCLONE 9012 AFTER ITS LANDING

Meteorological Institute of Fujian Province, Fuzhou, 350001

Meteorological Bureau of Fujian Province

Received Date: 1993-07-17

Rev Recd Date: 1993-10-20

Abstract: Using 2.5 ×2.5 winds and pressure grid data, the angular momentum budgets are studied in this paper for TC 9012 (Yancy) which was kept active 65 hours after land fall.It is found that the inland TC 9012 moved into the center of a relatively stable saddle, in which large amount of humid air was entrained into the storm from the southerly jet at low level to bund up the energy of latent heat, the weak cold air coming from the north provided it with baroclinic energy, while the vorticity transfer of geostrophic angular momentum on the radius 4°-8°from the cyclone center at upper troposphere and the input of cyclonic angular momentum produced by the βterm are immediate factors maintaining the central pressure and maximum winds.

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Reference (9)

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[6]	Moss M S. 1977. Low-layer observations along the periphery of 1975 Hurricane Eloise. AMS. Boston, 550-553.
[7]	Liang Li,Wu Zhiwei,Fu Fenhua,1990.On angular momentum budgets for typhoons with sudden intensity change. J. prop. Meteor.,6: 273-282.
[8]	Liang Li et al.,1985. Budgets of angular momentum for genesis and development of offshore Typhoon 7909 in East China Sea. In:Collected papers from typhoon conference. 379-387(in Chinese).
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THE DYNAMICS OF MAINTAINING THE TROPICAL CYCLONE 9012 AFTER ITS LANDING

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