A Nonlinear Extension of the Helicity Formula for Convective Storms

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概要

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• There exists a firm relation between the rotational updraught (and/or downdraught) of a convective storm and the storm-relative environmental helicity. The already-known formula, which was derived with linear approximation and on a form-preserving assumption, describes the relation qualitatively well. In this note, a similar formula is derived without the linear approximation, although the form-preserving assumption is retained. The nonlinear terms generate the acceleration of propagation and/or the temporal variation of growth rate of the storm, which are absent from the linear formula. These nonlinear effects enter the derived formula.

• 社団法人日本気象学会の論文
• 2002-10-25

著者

• KANEHISA Hirotada

  Meteorological College

• Kanehisa Hirotada

  Meteorological Coll.

関連論文

• Degenerate Modes of Gravitational, Barotropic and Baroclinic Instabilities
• Analytical Solutions of Transversely Propagating Rossby Waves
• Symmetric Instability without Symmetry
• A Nonlinear Extension of the Helicity Formula for Convective Storms
• Wave Energy at Critical Level
• A Conserved Quantity Related to Vorticity Component in the Direction of ∇θ × u
• A Note on Two Opposing Mechanisms for Blocking-Onset
• Degenerate Modes of Symmetric Instability
• A System of Equations Describing Quasi-Symmetric Mesoscale Phenomena

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