| 东亚地区夏季大气环流季节循环进程及其在区域持续性降水异常形成中的作用 |
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| 引用本文： | 廖清海,陶诗言.东亚地区夏季大气环流季节循环进程及其在区域持续性降水异常形成中的作用[J].大气科学,2004,28(6):835-846. |
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| 作者姓名： | 廖清海 陶诗言 |
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| 作者单位： | 中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 国家杰出青年基金项目40125014(部分)和国家自然科学基金资助项目40105010共同资助 |
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| 摘 要： | 利用32年(1968～1999年)月平均NCAR/NCEP再分析资料,分析了东亚地区夏季大气环流的季节循环进程, 并以1991/1994年为例,探讨了东亚地区夏季7～8月对流层上层环流的季节循环提前和延迟与气候平均的季节循环的差异,以及在江淮流域持续性降水异常过程中的作用,证实东亚地区季节循环的变异对形成我国东部地区持续性降水异常,特别是7月旱涝起着重要作用,江淮流域旱涝一般是和东亚地区大气环流季节循环的提早或推迟一个月左右相对应.通过波作用量的动力学诊断分析,研究了欧亚大陆沿副热带西风急流传播的异常准静止波的传播特征,并从以副热带西风急流为波导的准静止波(或者遥相关)角度对东亚地区夏季7～8月环流季节循环进程提前和延迟的可能机制作了分析.
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| 关 键 词： | 季节循环 欧亚大陆波型 旱涝 |
| 文章编号： | 1006-9895(2004)06-0835-12 |
The Seasonal March of Atmospheric Circulation over East Asia in the Late Summer and Its Role in the Formation of the Regional Persistent Precipitation Anomaly |
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| LIAO Qing-Hai and TAO Shi-Yan.The Seasonal March of Atmospheric Circulation over East Asia in the Late Summer and Its Role in the Formation of the Regional Persistent Precipitation Anomaly[J].Chinese Journal of Atmospheric Sciences,2004,28(6):835-846. |
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| Authors: | LIAO Qing-Hai and TAO Shi-Yan |
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| Abstract: | Based on the NCAR/NCEP monthly reanalysis dataset of 1968-1999, and the cases of 1991 and 1994,the progress of seasonal cycle of the summer atmospheric circulation in the East Asia during July-August, both advancing and delaying,and their roles in the processes of regional persistent precipitation anomalies in the Changjiang River and the Huaihe River valleys are analyzed and compared with that of climatology. The results show that the progress of seasonal cycle is advanced about a month ahead of the climatological time when floods occur in the Changjiang River and the Huaihe River valleys, while it is delayed about a month when droughts appear in the same region.Eliasson-Palm flux diagnosis confirm that the wave patterns over the Eurasian continent along the subtropical jet have important impacts on the formation of the advancing and delaying of the East Asian summer atmospheric circulation during July-August, and thus on the floods and droughts in the Changjiang River and the Huaihe River regions. However, further study is need on the origin and variation of the wave patterns and the machenism of the summer seasonal cycle in East Asia. |
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| Keywords: | seasonal cycle wave patterns over the Eurasian continent flood and drought |
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