| 一次大暴雨过程中急流次级环流的激发及作用 |
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| 引用本文： | 张维桓,董佩明,沈桐立.一次大暴雨过程中急流次级环流的激发及作用[J].大气科学,2000,24(1):47-57. |
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| 作者姓名： | 张维桓 董佩明 沈桐立 |
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| 作者单位： | 1.中国人民解放军理工大学气象学院,南京 211101 |
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| 基金项目： | 国家自然科学基金资助项目49745007 |
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| 摘 要： | 使用双向嵌套数值模式MM4对1992年7月23日发生在副高北侧京津冀 地区的一次大暴雨过程进行了成功的数值模拟。利用模拟得到的高时空分辨率资料，对 伴随高、低空急流的次级环流进行了诊断，结果表明:激发次级环流的主要因子和台风、 夏季江淮气旋有明显不同；总的次级环流在降水前，有利于天气区不稳定能量的积累， 而在降水过程中提供了持续稳定的上升运动条件；急流和暴雨之间通过次级环流存在着 正反馈相互作用。
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| 关 键 词： | 大暴雨过程 急流 次级环流 相互作用 |
Triggering and Effects of the Secondary Circulation Associated with Upper and Low-Level Jets in a Heavy Rainfall Process |
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| Zhang Weihuan,Dong Peiming and Shen Tongli.Triggering and Effects of the Secondary Circulation Associated with Upper and Low-Level Jets in a Heavy Rainfall Process[J].Chinese Journal of Atmospheric Sciences,2000,24(1):47-57. |
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| Authors: | Zhang Weihuan Dong Peiming and Shen Tongli |
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| Abstract: | The heavy rainfall process of July 23,1992 in Beijing-Tianjin-Hebei region is successfully simulated by using the meso-scale model MM4 with two-way nested grid By employing the model products with high temporal and spatial resolutions, the secondary circulation associated with upper and low-level jets is diagnosed The results show that the major factors forcing secondary circulation are different from those of typhoons and those of summer cyclones in Changjiang Huaihe river basin The overall secondary circulation is favorable for the accumulation of instability energy before the precipitation and provides a persistent ascending motion in the precipitation process There exists a positive feedback interaction between the heavy rainfall and jets |
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| Keywords: | heavy rainfall process jet secondary circulation interaction |
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