徐祥德,苗秋菊. 2000. 热带大气能量频散波射线的低频动力学特征[J]. 气象学报, 58(5):534-544, doi:10.11676/qxxb2000.056
热带大气能量频散波射线的低频动力学特征
THE LOW FREQUENCY DYNAMICS ON THE WAVE RAY PROPAGATION OF TROPICAL ATMOSPHERE ENERGY DISPERSION
投稿时间:1997-03-10  修订日期:1998-12-08
DOI:10.11676/qxxb2000.056
中文关键词:  热带  非零频波  低频  波射线  WKB近似
英文关键词:Tropics  Non-zero frequency wave  Low frequendy,Wave ray  WKB approximation
基金项目:国家自然科学基金95重大项目“淮河流域能量水分循环试验和研究项目”;国家攀登-B项目青藏高原地-气系统物理过程及其对全球气候和中国灾害性天气影响的观测和理论研究”
作者单位
徐祥德 中国气象科学研究院 北京 100081 
苗秋菊 中国气象科学研究院 北京 100081 
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中文摘要:
      首先在非零频波条件下采用有、无辐散两类数学模型,讨论热带大气低频波传播动力特征,研究结果表明,非零频的波频率参数是热带大气低频振荡源能量频散波路径及其波振幅的关键影响因子,且热带地区低频振荡的经向传播与其伴随着的强对流云团有显著相关,并与热带低纬β因子等相关。文中还进一步揭示了低纬大气低频振荡经向传播伴随的积云对流现象及向高中纬传播机理,描述了WKB近似方法数学模型及其波射线方程解模态对大气低频动力特性及其水汽分布垂直结构、不稳定层结等因子的响应特征。
英文摘要:
      In the presence of non-zero freqnency wave (NFW),two kinds of mathemaical models witrh or witrout divergence are investigated ahiut the dynamics of low frequency propagation of tropical atmosphere in tre study.The results suggest that the frequency parameter of NFW is a key factor,which dominates the wave train qath of energy disqersion as well as the amplitude variation,and that the meridiona lpropagation of low frequency oscillation(LFO) in tropics has the significant correlatiln with the strong convetive cloud cluster accompanied anf,to a certain eztent,with β effect in the lower latitudes.The conclusion presdnted here confirms further the phenomena and mechanisms about the metidional migration of armospheric LFO imn lower latitudes and the accompanying cumulus convection.The mathematical mode of wave ray epuation responding to the atmospheric LFO dynamic characteristics.The vertical structure if water vapor and umstable stratification etc.are also shown in the paper.
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