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The Conservation of Helicity in Hurricane Andrew (1992) and the Formation of the Spiral Rainband


doi: 10.1007/BF02915517

  • The characteristics of helicity in a hurricane are presented by calculating the MM5 model output in addition to theoretical analysis. It is found that helicity in a hurricane mainly depends on its horizontal component, whose magnitude is about 100 to 1000 times larger than its vertical component. It is also found that helicity is approximately conserved in the hurricane. Since the fluid has the intention to adjust the wind shear to satisfy the conservation of helicity, the horizontal vorticity is even larger than the vertical vorticity, and the three-dimensional vortices slant to the horizontal plane except in the inner eye. There are significant horizontal vortices and inhomogeneous helical flows in the hurricane. The formation of the spiral rainband is discussed by using the law of horizontal helical flows. It is closely related to the horizontal strong vortices and inhomogeneous helical flows.
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Manuscript History

Manuscript received: 10 November 2003
Manuscript revised: 10 November 2003
通讯作者: 陈斌, bchen63@163.com
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The Conservation of Helicity in Hurricane Andrew (1992) and the Formation of the Spiral Rainband

  • 1. Department of Atmosphere Science, Nanjing University, Nanjing 210093;Key Laboratory of Mesoscale Severe Weather of Ministry of Education, China;Department of Geoscience, Zhejiang University, Hangzhou 310028,Department of Geoscience, Zhejiang University, Hangzhou 310028

Abstract: The characteristics of helicity in a hurricane are presented by calculating the MM5 model output in addition to theoretical analysis. It is found that helicity in a hurricane mainly depends on its horizontal component, whose magnitude is about 100 to 1000 times larger than its vertical component. It is also found that helicity is approximately conserved in the hurricane. Since the fluid has the intention to adjust the wind shear to satisfy the conservation of helicity, the horizontal vorticity is even larger than the vertical vorticity, and the three-dimensional vortices slant to the horizontal plane except in the inner eye. There are significant horizontal vortices and inhomogeneous helical flows in the hurricane. The formation of the spiral rainband is discussed by using the law of horizontal helical flows. It is closely related to the horizontal strong vortices and inhomogeneous helical flows.

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