| 高空西风急流和低空南风急流中的冷锋环流 |
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| 引用本文： | 吕克利,钱滔滔.高空西风急流和低空南风急流中的冷锋环流[J].大气科学,1996,20(6):679-690. |
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| 作者姓名： | 吕克利 钱滔滔 |
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| 作者单位： | 南京大学大气科学系,南京 210093 |
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| 基金项目： | 本文获得国家自然科学基金和85-906项目共同资助 |
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| 摘 要： | 文中利用原始方程模式研究了不同背景风场中的冷锋环流，计算结果显示，对越锋非地转环流和锋区垂直运动起主要作用的是垂直于锋面的背景风场，沿锋的背景风场也有影响，但比前者小得多，后者产生的越锋非地转环流和上升速度也比前者弱得多；具有强垂直切变的西风急流更有利于在锋区产生强的越锋环流和大的上升速度；此外，越锋非地转环流还与Richardson数的小值区相联系。
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| 关 键 词： | 高空急流 低空急流 冷锋环流 |
The Cold-Frontal Circulation in the Upper-Level Westerly Jet and Low-Level Southerly Jet |
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| Lu Keli and Qian Taotao.The Cold-Frontal Circulation in the Upper-Level Westerly Jet and Low-Level Southerly Jet[J].Chinese Journal of Atmospheric Sciences,1996,20(6):679-690. |
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| Authors: | Lu Keli and Qian Taotao |
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| Abstract: | The influence of different background currents on the circulation of a dry cold front is investigated by using a primitive equation model. The calculations show that the upper-level westerly flow plays a main role in the development and enhancement of the cross-frontal ageostrophic circulation and vertical motion in the frontal zone. The cross-frontal circulation also depends on the low-level southerly flow. However, its effect is much weaker than the westerly flow. The westerly current with strong vertically shear is advantageous to generate a stronger cross-frontal circulation and upward motion in the frontal zone. In addition, the cross-frontal circulation is related with the regions of small Richardson number. |
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| Keywords: | upper-level jet low-level jet cold front |
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