| 中国东部夏季降水80年振荡与东亚夏季风的关系 |
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| 作者姓名： | Zhu Jinhong Wang Shaowu |
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| 作者单位： | Zhu Jinhong and Wang Shaowu Department of Geophysics，Peking University，Beijing 100871 |
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| 基金项目： | This research was supported by National Key Program for Developing Basic Sciences
(G 199804900-Part 1 ). |
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| 摘 要： | 利用中国东部1470－1999年夏季降水级别资料和1951－1999年夏季降水观测资料，以及1871－2000年北半球海平面气压资料研究了中国东部夏季降水与东亚夏季风的关系。研究表明华北及东北南部、长江中下游地区和华南夏季降水存在明显的80年振荡，华北夏季降水的80年振荡与华南同位相，与长江中下游反位相。华北夏季降水与海平面气压在120°－130°E，20°－25°N区域内呈负相关，在121°－130°E，20°－25°N区域内呈正相关，并达到 95％信度。因此，利用这两个区域平均海平面气压差定义了一个表征夏季西南风强度的东亚夏季风指数。当东亚夏季风强时，华北夏季降水偏多，同时长江中下游少雨；当东亚夏季风接近正常时，华北干旱，长江中下游多雨。最后，利用530年的华北夏季降水长序列资料研究了东亚夏季风的年代际变率。
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| 关 键 词： | 80年振荡 中国东部夏季降水 东亚夏季风 |
80a-Oscillation of Summer Rainfall over the East Part of China and East-Asian Summer Monsoon |
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| Zhu Jinhong,Wang Shaowu.80a-Oscillation of Summer Rainfall over the East Part of China and East-Asian Summer Monsoon[J].Advances in Atmospheric Sciences,2001,18(5):1043-1051. |
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| Authors: | Zhu Jinhong and Wang Shaowu |
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| Institution: | Department of Geophysics, Peking University, Beijing 100871,Department of Geophysics, Peking University, Beijing 100871 |
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| Abstract: | Relationship between summer rainfall over the east part of China and East-Asian Summer Monsoon (EASM) was studied based on the summer rainfall grade data set from 1470 to 1999 and the rain gauge data set from 1951 to 1999 over the east part of China, and sea level pressure (SLP) data for the period of 1871-2000. A distinct 80a-oscillation of summer rainfall was found over North China (NC), southern part of Northeast China, over the middle and lower reaches of the Yangtze River (YR) and South China (SC). The 80a oscillation of summer rainfall over NC was varied in phase with that over SC, and was out of phase to that along the middle and lower reaches of the Yangtze River. Summer rainfall over NC correlated negatively with the SLP averaged for the area from 105°E to 120°E, and from 30°N to 35°N, but positively to that for the area from 120°E to 130°E, and from 20°N to 25°N. Therefore, an index of EASM was de fined by the difference of averaged SLP over the two regions. The summer rainfall over NC was greater than normal when the EASM was strong, and while drought occurred along the middle and lower reaches of the Yangtze River. The drought was found over NC, and flood along the middle and lower reaches of the Yangtze River when the EASM was close to normal. Finally, the interdecadal variability of EASM was stu died by using of long term summer rainfall grade data set over NC for the past 530 years. |
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| Keywords: | 80a-oscillation Summer rainfall over the east part of China Summer East-Asian monsoon |
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