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Stability of planetary waves in a two-layer system

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摘要

A stability of planetary waves on an infinite beta-plane is investigated in an idealized two-layer fluid system for the large local Rossby numberM. When a primary wave is barotropic, two kinds of barotropic instability modes are found. One of them was previously discussed byGill(1974). When a primary wave is baroclinic, two different kinds of modes that enable barotropic and baroclinic energy transfers are found. The one that has the larger growth rate gains its energy mainly from the mean shear of the primary wave when the internal rotational Froude numberFis smaller than 1/2. WhenFis larger than 1/2, however, the available energy conversion of the primary wave is dominant. This mode has a fairly large part of its energy in the barotropic motion although the primary wave is purely baroclinic.

著录项

  • 来源
    《日本海洋学会誌》 |2005年第3期|116-127|共页
  • 作者

    ToshioYamagata;

  • 作者单位

    University of Kyushu;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

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