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《Acta Meteorologica Sinica》 2001-04
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THE INSTABILITY OF THE VORTEX SHEET ALONG THE HORIZONTAL SHEAR LINE

Gao Shouting Zhou Yushu (State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China)  
The traditional Kelvin Helmholtz notion of studying the shear instability is not suitable to the shear line with the strong horizontal wind shear. For this case, the shear line should be considered as the vortex sheet. Since then, the instability of this kind of the shear line becomes the instability of the vortex sheet rather than the traditional shear instability. If the velocity is induced by the vortex sheet, the in equalities, (1-R v+R id )0 and U(y,t) U(A(t)) become the criterion of the vortex sheet instability. This criterion indicates that the disposition of environment field restrains the disturbance developing along the shear line,there exist multi scale interactions between this mesoscale disturbance and environment field. The calculation of the necessary condition for the instability is also presented in this paper.
【Fund】: “我国重大气候和天气灾害形成机理与预测理论研究”项目 (G1 9980 40 90 7) ;; 国家自然科学基金重点课题“中尺度强对流动力学研究”(4 973 5 1 80 )
【CateGory Index】: P433
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