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非保守系统中的对称不稳定 II.弱加热的强迫作用 被引量:6

Symmetric Instability in Nonconservative SystemsPart II: Forcing Effect of Weak Heating
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摘要 对非保守系统中的对称不稳定问题进行了研究。这里是该文的第二部分,主要讨论弱加热的强迫作用。研究结果表明,采用WaveCISK方法考虑弱加热的影响时,发现中高层加热只对一个较为狭窄的短波段扰动具有增长作用,而对其它波长较长的扰动则反而起到衰减作用。中低层加热能够提高波长较长的扰动之增长率,但会削减波长较短扰动的增长率。此外,由于潜热加热作用而新产生的大部分模态都偏向南(即暖区)传播,随着最高加热层次的降低,这种偏向更为明显,但也有向冷区传播的情况。 The present paper has comprehensively dealt with the problems of symmetric instability in nonconservative systems. The forcing effect of weak heating is studied in this part. From examination of the effect of weak heating by using waveCISK method, it is found that the upperlevel heating can only develop the disturbances which are in a narrow spectrum of short waves, but decay other disturbances whose wavelengthes are longer. The lowlevel heating can increase the growth rate of the disturbances in larger wavelengthes, but decrease the growth rate of the disturbances in short wavelengthes. In addition, the most of the modes newly induced by latent heating propagate toward the south (i. e. warm sector). The southward phase velocity is bigger with lowering of the level of the heating peak. Some other disturbances may propagate toward cold sector. 
出处 《大气科学》 CSCD 北大核心 1998年第3期274-282,共9页 Chinese Journal of Atmospheric Sciences
基金 国家自然科学基金
关键词 非保守系统 弱加热 对称不稳定 中尺度 大气 nonconservative systems weak heating conditional symmetric instability
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参考文献4

  • 1丁一汇,中国科学.B,1993年,23卷,11期,1226页
  • 2Xu Q,Quart J R Meteorol Soc,1986年,112卷,315页
  • 3李崇银,大气科学,1983年,7卷,260页
  • 4李崇银,中国科学.B,1983年,875页

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