| 1998年中国区域降水低频变化的传播机制的初步分析 |
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| 引用本文： | 徐国强,朱乾根,薛纪善,何金海.1998年中国区域降水低频变化的传播机制的初步分析[J].大气科学,2004,28(5):736-746. |
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| 作者姓名： | 徐国强 朱乾根 薛纪善 何金海 |
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| 作者单位： | 中国气象科学研究院,北京,100081;南京气象学院,南京,210044 |
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| 基金项目： | 国家自然科学基金资助项目90211011和国家"十五"科技攻关项目2001BA607B03共同资助 |
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| 摘 要： | 使用美国NCEP/NCAR再分析和中国实际降水的逐日资料,研究了1998年夏季中国区域低频降水传播变化的机制.结果显示,(1)中国中东部地区低频降水经向传播都与南海季风和印度季风的变化相对应,低频降水在经向传播中存在不连续现象,是由于低频下沉气流造成的;(2)中国中部区域低频降水纬向传播特征是在不同时间低频降水的纬向传播方向有明显差别,初步认为造成这种现象的可能机制是纬向风气流的变化;(3)高原地区与平原地区之间的低频雨带活动具有不连续性,这是由于在高原东坡存在低频下沉补偿气流造成的.
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| 关 键 词： | 低频降水 传播 机制 |
| 文章编号： | 1006-9895(2004)05-0736-11 |
A Pilot Study of Propagation Mechanisms of Precipitation Low-Frequency Variation over China in 1998 |
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| XU Guo-Qiang,ZHU Qian-Gen,XUE Ji-Shan and HE Jin-Hai.A Pilot Study of Propagation Mechanisms of Precipitation Low-Frequency Variation over China in 1998[J].Chinese Journal of Atmospheric Sciences,2004,28(5):736-746. |
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| Authors: | XU Guo-Qiang ZHU Qian-Gen XUE Ji-Shan and HE Jin-Hai |
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| Abstract: | In the context of NCEP/NCAR reanalysis and real precipitation daily data in 1998, propagation variational mechanisms of low-frequency rainfall (LFR) over China in 1998 are studied. Results show that LFR meridional propagation is closely related to variations of the South China Sea monsoon and the India monsoon. Discontinuity of LFR meridional migration is caused by low-frequency downdraft in this region. LFR zonal propagation direction displays obvious difference with the time, the difference may be caused by zonal flow variation. Discontinuity of LFR propagation over the Tibetan Plateau and its eastern plain in China is revealed, which is induced by Low-frequency redeeming downdraft at the east slope of the highland. |
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| Keywords: | low-frequency rainfall propagation mechanism |
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