| 1979年2月平流层持续性暖平流与阻塞形势的相互联系 |
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| 引用本文： | 李自强,高由禧.1979年2月平流层持续性暖平流与阻塞形势的相互联系[J].高原气象,1990,9(4):356-363. |
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| 作者姓名： | 李自强 高由禧 |
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| 作者单位： | 中国科学院兰州高原大气物理研究所，中国科学院兰州高原大气物理研究所，中国科学院兰州高原大气物理研究所 总参气象局 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 本文利用1979年2月的FGGE资料,诊断分析了北半球冬季平流层内持续性暖平流与对流层阻塞形势的相互联系。分析指出:北大西洋平流层持续性暖平流提供了对流层阻塞形势形成、维持的可能机制和引起对流层内持续的暖平流强度随高度减小的形势,通过斜压机制造成北大西洋阻塞高压在对流层内形成和维持。 垂直运动场的分析表明:平流层持续性暖平流作为一种强的引导,从对流层到平流层产生强烈上升运动,在对流层上层和平流层下层高压脊后产生强的辐散,反气旋性涡度使得下游高压脊发展。文中还指出:平流层内暖平流与对流层阻塞高压同时具有持续性、区域性及准静止性的特点。
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| 关 键 词： | 平流层 阻塞形势 持续性 暖平流 |
THE RELATIONSHIP BETWEEN PERSISTENT WARM ADVECTION IN THE STRATOSPHERE AND BLOCKING SITUATION IN FEBRUARY 1979 |
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| Li Ziqiang Gao Youxi Qu Zhang.THE RELATIONSHIP BETWEEN PERSISTENT WARM ADVECTION IN THE STRATOSPHERE AND BLOCKING SITUATION IN FEBRUARY 1979[J].Plateau Meteorology,1990,9(4):356-363. |
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| Authors: | Li Ziqiang Gao Youxi Qu Zhang |
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| Abstract: | The FGGE gridded data in February 1979 are used in this study to analyze and diagnose the relationship between stratospheric persistent warm advection and blocking situation.
The study shows that before the developing of the 500 hPa ridge, stratospheric strong warm advections to the west of the ridge have already occurred for at least more than ten days. They cause the persistent situations of warm advections decreased with height in the troposphere, the strong upward motion extended from troposphere to stratosphere and tilted westward with height, the strong divergence occurred to the rear of the ridge in upper troposphere and lower stratosphere, and result in the blocking event. Namely, the persistent stratospheric warm advections may provide the favorable conditions of formation and maintenance of blocking pattern. |
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| Keywords: | Persistent warm advection Blocking situation Stratosphere |
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