| 中国东部夏季气候20世纪80年代后期的年代际转型及其可能成因 |
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| 引用本文： | 张人禾,武炳义,赵平,韩晋平.中国东部夏季气候20世纪80年代后期的年代际转型及其可能成因[J].气象学报,2008,66(5):697-706. |
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| 作者姓名： | 张人禾 武炳义 赵平 韩晋平 |
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| 作者单位： | 中国气象科学研究院灾害天气国家重点实验室，北京，100081;中国气象科学研究院灾害天气国家重点实验室，北京，100081;中国气象科学研究院灾害天气国家重点实验室，北京，100081;中国气象科学研究院灾害天气国家重点实验室，北京，100081 |
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| 基金项目： | 国家973项目，国家自然科学基金项目 |
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| 摘 要： | 指出了中国东部夏季气候在20世纪80年代末出现了一次明显的年代际气候转型.伴随着这次年代际转型,80年代末以后中国东部南方地区降水明显增多,500 hPa西太平洋副热带高压西伸且南北范围变大,西北太平洋上空850 hPa反气旋增强.中国东部夏季80年代后期出现南方多雨的年代际转型与欧亚大陆春季积雪、西北太平洋夏季海面温度的年代际变化存在密切联系,它们也都在80年代末出现年代际转型.从80年代末以后,伴随着欧亚大陆春季积雪明显减少和西北太平洋夏季海面温度明显增高,中国夏季南方降水明显增加.文中分析了欧亚大陆春季积雪和西北太平洋夏季海面温度影响中国降水的物理过程,指出欧亚大陆春季积雪能够在500 hPa激发出大气中的遥相关波列,所激发出的波列可以从春季一直持续到夏季,造成中国北方为高压控制,南方为微弱低压控制,使得降水出现在中国南方.西北太平洋夏季海面温度的升高能够减小海陆热力差异,使得夏季风减弱,导致中国南方地区降水增多.
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| 关 键 词： | 中国东部夏季气候 年代际变化 年代际转型 |
| 收稿时间： | 9/4/2008 12:00:00 AM |
| 修稿时间： | 2008/9/26 0:00:00 |
The decadal shift of the summer climate in the late 1980s over East China and its possible causes. |
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| ZHANG Renhe,WU Bingyi,ZHAO Ping,HAN Jinping.The decadal shift of the summer climate in the late 1980s over East China and its possible causes.[J].Acta Meteorologica Sinica,2008,66(5):697-706. |
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| Authors: | ZHANG Renhe WU Bingyi ZHAO Ping HAN Jinping |
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| Abstract: | In this paper, it is pointed out that a notable decadal shift of the summer climate in eastern China occurred in the late 1980s. In association with this decadal climate shift, after the late 1980s more precipitation appeared in the southern region of eastern China (namely South China), the western Pacific subtropical high stretched farther westward with a larger south-north extent, and a strengthened anticyclone at 850 hPa appeared in the northwestern Pacific. The decadal climate shift of the summer precipitation in South China was accompanied withdecadal changes of the Eurasian snow cover in boreal spring and sea surface temperature (SST) in western North Pacific in boreal summer in the late 1980s. After the late 1980s, the spring Eurasian snow cover apparently became less and the summer SST in western North Pacific increased obviously, which were well correlated with the increase of the South China precipitation. The physical processes are also investigated on how the summer precipitation in China was affected by the spring Eurasian snow cover and summer SST in western North Pacific. The change of the spring Eurasian snow cover could excite a wave train in higher
latitudes, which lasted from spring to summer. Because of the wave train, an ab
normal high appeared over North China and a weak depression over South China, leading to more precipitation in South China. The increase of the summer SST in the western North Pacific reduced the land-sea thermal contrast and thus weakened the East Asian summer monsoon, also leading to more precipitation in South China. |
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| Keywords: | Summer climate in eastern China Decadal climate variability Decadal climate shift |
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