| 太平洋湍流热通量异常与中国夏季降水年代际变化 |
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| 引用本文： | 李忠贤,陈建萍,倪东鸿,曾刚.太平洋湍流热通量异常与中国夏季降水年代际变化[J].气象与减灾研究,2007,30(2):6-12. |
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| 作者姓名： | 李忠贤 陈建萍 倪东鸿 曾刚 |
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| 作者单位： | 1. 南京信息工程大学,江苏,南京,210044
2. 南京信息工程大学,江苏,南京,210044;江西省气象台,江西,南昌,330046 |
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| 基金项目： | 南京信息工程大学校科研基金资助项目(编号:y411)，江苏省气象灾害重点实验室资助项目(编号:KLME060301) |
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| 摘 要： | 采用NCEP/NCAR再分析感热、潜热资料,利用EOF方法,分析了夏季太平洋湍流热通量年代际变化的时空特征及其与中国夏季降水的关系。分析结果显示,1951—2003年夏季太平洋湍流热通量距平的年代际分量的EOF前3个模态的方差贡献率分别为32.27%、12.52%、11.10%,且这3个模态分别与中国华北、华南和东北地区夏季降水的年代际关系密切;太平洋湍流热通量年代际异常EOF第1模态的时间系数与东亚夏季风指数年代际变化有显著的负相关。20世纪70年代中期以前,太平洋湍流热通量异常偏多,东亚夏季风偏强,对应华北降水偏多;20世纪70年代中期以后,太平洋湍流热通量异常偏少,东亚夏季风偏弱,对应华北夏季降水减少,干旱化趋势明显。
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| 关 键 词： | 湍流热通量 夏季降水 年代际变化。 |
| 文章编号： | 1007-9033（2007）02-0006-07 |
| 修稿时间： | 2007-03-102007-04-26 |
Decadal Variations of Summer Precipitation in China with Pacific Surface Turbulent Heat Fluxes Anomalies |
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| LI Zhong-xian,Chen Jian-ping,NI Dong-hong,ZENG Gang.Decadal Variations of Summer Precipitation in China with Pacific Surface Turbulent Heat Fluxes Anomalies[J].Meteorology and Disaster Reduction Research,2007,30(2):6-12. |
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| Authors: | LI Zhong-xian Chen Jian-ping NI Dong-hong ZENG Gang |
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| Institution: | 1. Jiangsu Key Laboratory of Meteorological Disaster, NUIST, Nanjing 210044, China; 2. Jiangxi Provincial Meteorological Observatory, Nanchang 330046, China |
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| Abstract: | The spatio-temporal characteristics of decadal variations of Pacific surface turbulent heat fluxes anomalies and their relations with summer precipitation in China and East Asian atmospheric circulation are analyzed in this paper.Conclusions are drawn as follows:(1) The contribution rate of the first three EOF modals of Pacific surface turbulent heat fluxes anomalies from 1951 to 2003 are 32.27%,12.52% and 11.10%,and the first three modes are related closely with the decadal variations of summer precipitation North China,South China and Northeast China separately.(2) There is obviously negative relationship between the time coefficients of the first principal component of EOF of Pacific surface turbulent heat fluxes anomalies and the decadal variations of East Asian summer monsoon index.Before the middle of 1970's,Pacific surface turbulent heat fluxes are lager than normal,East Asian summer monsoon is strengthened,with more rainfall in North China;and vice versa. |
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| Keywords: | Turbulent heat fluxes Summer precipitation Decadal variations |
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