| 华北地区降水事件变化和暴雨事件减少原因分析 |
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| 引用本文： | 郝立生, 闵锦忠, 丁一汇. 华北地区降水事件变化和暴雨事件减少原因分析[J]. 地球物理学报, 2011, 54(5): 1160-1167, doi: 10.3969/j.issn.0001-5733.2011.05.003 |
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| 作者姓名： | 郝立生 闵锦忠 丁一汇 |
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| 作者单位： | 1. 南京信息工程大学 大气科学学院,南京 210044; 2. 河北省气候中心,石家庄 050021; 3. 国家气候中心,北京 100081 |
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| 基金项目： | 中国气象局气候变化专项 |
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| 摘 要： | 使用北京、天津、河北、山西的37个气象观测站的1961~2008年逐日降水资料和NCEP、EC环流资料,对华北降水事件和暴雨事件减少原因进行分析.结果表明,华北地区盛夏暴雨事件对夏季降水量和全年降水量变化有重要影响,近50年盛夏暴雨事件呈显著线性减少趋势,这与东亚夏季风减弱使得从南边界进入华北的水汽通量大量减少以及副热带高压位置南移有关.此外,盛夏暴雨事件减少还与印度对流减弱和菲律宾对流加强、125°E越赤道气流减弱和145°E越赤道气流加强有很好的对应关系.这为认识华北降水减少变化提供了科学依据.
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| 关 键 词： | 华北 暴雨事件 季风 水汽通量 热带对流 |
| 收稿时间： | 2010-02-26 |
| 修稿时间： | 2010-07-01 |
Analysis of precipitation events changes and causes for rainstorm events reduction in North China |
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| HAO Li-Sheng, MIN Jin-Zhong, DING Yi-Hui. Analysis of precipitation events changes and causes for rainstorm events reduction in North China[J]. Chinese Journal of Geophysics (in Chinese), 2011, 54(5): 1160-1167, doi: 10.3969/j.issn.0001-5733.2011.05.003 |
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| Authors: | HAO Li-Sheng MIN Jin-Zhong DING Yi-Hui |
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| Affiliation: | 1. School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Hebei Climate Center, Shijiazhuang 050021, China; 3. National Climate Center, Beijing 100081, China |
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| Abstract: | Based on the daily precipitation data of 1961~2008 from 37 meteorological stations and NCEP, ECMWF reanalysis grid data, the precipitation events change and rainstorm events reduction occurred in North China were analyzed. The results show that mid-summer rainstorm event has a great impact on the summer precipitation and annual precipitation in North China during recent 50 years. Mid-summer rainstorm events showed significant linear decreasing trend, which was related with water vapor flux reduction into North China through the south border caused by the weakening of East Asian summer monsoon. In addition, mid-summer rainstorm events reduction is also well correlated with the weakening of India convection and the enhancing of Philippine convection, as well as the weakening of 125°E cross-equatorial flow and the strengthening of 145°E cross-equatorial flow. This provides an understanding of precipitation reduction in North China. |
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| Keywords: | North China Rainstorm events Monsoon Water vapor flux Tropical convection |
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