| 源地冷空气强度变异与冷涌活动特征的数值试验 |
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| 引用本文： | 余斌,朱乾根,徐祥德.源地冷空气强度变异与冷涌活动特征的数值试验[J].中国科学院研究生院学报,1992(4). |
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| 作者姓名： | 余斌 朱乾根 徐祥德 |
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| 作者单位： | 中科院大气物理所90级，南京气象学院，南京气象学院 博士生 |
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| 基金项目： | 国家自然科学基金，国家气象局季风科研基金 |
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| 摘 要： | 本文用数值试验的方法讨论了冬季风冷涌期冷源与中低纬间的相互作用。结果表明,冷源较强时,冷空气较为平直地南传;冷源减弱时,南传路径较大地绕青藏高原呈弧形弯曲。同时,冷涌对低纬地区的作用强度与中纬冷源强度间并不存在简单的线性对应关系。对低纬地区强东北风形成,非地转和非地转平流作用可以同等重要。试验结果还指出,在一般强度的冷涌过程中,东亚低纬对中高纬的反馈作用是不明显的。但对中高纬源相当强的冷涌过程,低纬的反馈作用却很清楚。这种作用的形成与东亚局地Hadley环流上层支的加强有关。
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| 关 键 词： | 冷涌 冷源强度 中低纬相互作用 |
The Numerical Experiments on the Influence, of Intensities of Cold Sources on the Active Feature of Cold Surge |
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| Yu Birt,Zhu Qiangen,Xu Xiangde.The Numerical Experiments on the Influence, of Intensities of Cold Sources on the Active Feature of Cold Surge[J].Journal of the Graduate School of the Chinese Academy of Sciences,1992(4). |
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| Authors: | Yu Birt Zhu Qiangen Xu Xiangde |
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| Institution: | Nanjing Institute of Meteorology |
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| Abstract: | In this paper, the influence of cold source on the interaction between middle and low latitude atmosphere in cold surge has been tested by means of a five-layer primitive equation model. Numerical experiments show that the stronger the cold source in high latitude, the straighter the propagation ray of cold air from high to lowlatitude, and the weaker the source, the swirler the ray around" the Tibetan plateau. The intensity of which the cold surge affects low latitude atmosphere does not simply corresponds to the intensity of cold source. And for forming the strong north-east wind in South China Sea, ageostrophic effect and ageostrophic advection effect cart be of the same importance. Numerical results also indicate that the feedback of low latitude to middle latitude is obvious (inobvious) if the cold source is strong (weak). The forming of this feedback is associated with the increasing upper component of East Asian Local Hadley Gell. |
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| Keywords: | cold surge cold source mid-low latitude atmosphere interaction |
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