| 东西风廓线特征与大气运动平衡态定常波的相关关系及共振条件的研究 |
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| 引用本文： | 徐祥德,朱复成,陆曼云.东西风廓线特征与大气运动平衡态定常波的相关关系及共振条件的研究[J].高原气象,1991(2). |
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| 作者姓名： | 徐祥德 朱复成 陆曼云 |
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| 作者单位： | 南京气象学院 江苏省南京市
(徐祥德，朱复成)，南京气象学院 江苏省南京市(陆曼云) |
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| 摘 要： | 本文采用简化数学模型探讨了东、西风廓线特征与外源强迫下大气环流平衡态定常波结构的相关关系。文中采用实际观测资料研究了西风廓线特征与大气环流型季节特征之间的联系。研究表明,西风廓线冬、夏季节差异与中、高纬度西风槽“冬三夏四”波数差气候特征有关,且低纬强东风切变可作为赤道东风波周期振荡成因之一。冬夏西风廓线季节特征可导致大地形强迫效应、海陆加热因子影响作用的显著季节差异。研究还揭示了大气环流型优势波转换的基流特征影响效应,并导出了流场与纬向加热强迫源共振状态的西风廓线特征函数与临界曲线。
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| 关 键 词： | 西风廓线特征 平衡态定常波 热源强迫 东风波周期振荡 |
CORRELATIONS BETWEEN THE PROFILE CHARACTERISTICS OF THE EASTERLIES AND WESTERLIES AND STATIONARY WAVES IN EQUILIBRIUM STATE |
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| Xu Xiangde Zhu Fucheng Lu Manyun.CORRELATIONS BETWEEN THE PROFILE CHARACTERISTICS OF THE EASTERLIES AND WESTERLIES AND STATIONARY WAVES IN EQUILIBRIUM STATE[J].Plateau Meteorology,1991(2). |
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| Authors: | Xu Xiangde Zhu Fucheng Lu Manyun |
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| Institution: | Nanjing Institute of Meteorology |
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| Abstract: | The correlations between profile characteristics of easterlies and westerlies and the structure of stationary waves of the general circulation equilibrium state, forced by external forcing, are investigated with a simplified two-level model. The connection between profile characteristics of the westerlies and seasonal characters of atmospheric circulation pattern are studied used observation data. The results indicate that the climatic features of westerly trough in the middle and high latitudes are correlated with the differences of westerly profiles in winter and summer, and the intense shear of easterlies in lower latitudes may be a cause for the periodic oscillations of easterly flow in the tropical region. The seasonal differences of westerly profiles in winter and summer can lead to different effects of orography and sea-land thermal forcings on the atmosphere. The research in this paper reveals the effects of basic flow characters on transformation of dominate wave patterns in the general circulation. Additionally, a characteristic function of westerly profiles and critical curves are also derived from the condition of resonant state between stream field and zonal thermal forcing. |
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| Keywords: | Profile characteristics of westerlies Stationary waves in equilibrium state Thermal forcing Periodic oscillations of easterly flow |
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