THE CISK MECHANISM AND THE INERTIAL GRAVITATIONAL WAVES IN SHEAR FLOW

Wu Hong; Xia Youlong; Zheng Zuguang

Abstract:

By using the symmetric equations of atmospheric dynamics in y-z plane with vertical and horizontal shear of wind, the nonlinear ordinary differential equation is derived with the method of travelling wave.Its stability is discussed by using the theory of nonlinear stability and the KDV equation is solved. The effects of linear CISK, nonlinear CISK, inertial stability and vertical shear of wind on the amplitude and the width of isolated inertial gravitational wave are discussed. In order to understand deeply the formation and development of meso-scale synoptic systems, such as the squall line, MCC, the cold surge of Asia high and typhoon, the factors of development of the isolated inertial gravity wave are analysed.

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Wu Hong, Xia Youlong, Zheng Zuguang. THE CISK MECHANISM AND THE INERTIAL GRAVITATIONAL WAVES IN SHEAR FLOW [J]. Journal of Tropical Meteorology, 1996, 2(2): 194-202.

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THE CISK MECHANISM AND THE INERTIAL GRAVITATIONAL WAVES IN SHEAR FLOW

Beijing Institute of Meteorology, Beijing, 100081

Received Date: 1995-01-20

Rev Recd Date: 1995-09-26

Abstract: By using the symmetric equations of atmospheric dynamics in y-z plane with vertical and horizontal shear of wind, the nonlinear ordinary differential equation is derived with the method of travelling wave.Its stability is discussed by using the theory of nonlinear stability and the KDV equation is solved. The effects of linear CISK, nonlinear CISK, inertial stability and vertical shear of wind on the amplitude and the width of isolated inertial gravitational wave are discussed. In order to understand deeply the formation and development of meso-scale synoptic systems, such as the squall line, MCC, the cold surge of Asia high and typhoon, the factors of development of the isolated inertial gravity wave are analysed.

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Reference (9)

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[3]	Li Chongyin, 1983. Effects of the environmental flow field on the formation and development of typhoon,Acta. Meteo. Sin.,3:275-283 (in Chinese).
[4]	Li Chongyin, 1983. A further inquiry on the mechanism of 30-60 day oscillation in the tropical atmosphere,Advances in Atmos. Sci.,1:41-53.
[5]	Li Tianming, Zhu Yongti,1989. On the multiple equilibrium of the development of tropical eyclone in nonlinear CISK model,Advances in Atmos. Sci.,4:447-457.
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[9]	Xia Youlong,Zheng Zuguang,1993. The effects of vertical variation of basic flow and horizonta lgradient of temperature on linear and nonlinear gravity waves,Acta. Meteo. Sin.,4:495-505.

THE CISK MECHANISM AND THE INERTIAL GRAVITATIONAL WAVES IN SHEAR FLOW

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