The Dynamic Mechanism of the Formation of the Low Level Jet

著录项

• 来源
  《大气科学进展：英文版》 |1990年第4期|383-394|共12页
• 作者

  杨大升; 简茂球;

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• 作者单位

  Department of Geophysics;

  Peking University;

  Beijing 100871;

  Department of Geophysics;

  Peking University;

  Beijing 100871he ordinary multidimensional reductive perturbation method is generalized so as to apply to the general case including the dissipative factor. With this the corresponding Cubic-Schrbdinger equation is deduced;

  and by the preliminary study of its solution;

  it shows that it is more admissible to consider atmospheric meso-scale systems as the nonlinear Cubic-Schrbdinger waves.With suitable boundary and initial conditions;

  the Cubic-Schrodinger equation is numerically integrated so as to investigate the possible dynamic mechanism as well as the impacts of the nonlinear action;

  turbulent friction and topogrphy to the formation of the LLJ. The results indicate that the downward transfer of the momentum and the effect of the surface friction are responsible for the concentration of the momentum in the layer between 850 and 700 hPa. The location of the horizontal concentration of momentum depends on the propagation of momentum;

  in the process the inertia-gravity internal wave is very important;

  whereas turbulent friction is unfavourable for or delays the formation of the low level jet.;

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• 原文格式 PDF
• 正文语种 chi
• 中图分类 大气科学（气象学）;
• 关键词

  momentum; turbulent; perturbation; inertia; ordinary; admissible; dissipative; deduced; gravity; downward;