| 1951—2012年中国降水集中度和
集中期的时空格局 |
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| 引用本文： | 孔锋,方佳毅,刘凡,方建,史培军.1951—2012年中国降水集中度和
集中期的时空格局[J].北京师范大学学报(自然科学版),2015,51(4):404-411. |
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| 作者姓名： | 孔锋 方佳毅 刘凡 方建 史培军 |
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| 作者单位： | 1)北京师范大学地表过程与资源生态国家重点实验室,100875,北京;
2)北京师范大学民政部教育部减灾与应急管理研究院,100875,北京;
3)北京师范大学环境演变与自然灾害教育部重点实验室,100875,北京 |
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| 基金项目： | 国家自然科学基金创新研究群体资助项目(413221001)，国家重大科学研究计划(973)资助项目(2012CB955404) |
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| 摘 要： | 以1978年为分界点,对1978年前后的以周为单位的降水集中度和集中期的时空格局和变化趋势进行研究.结果表明:1)中国的降水集中度首先具有明显南北分异规律,其次在中国北部具有明显东西差异;最后,中国整体降水集中度波动呈现减小趋势,且1978年之前波动较大,1978年之后趋于平稳.2)中国的降水集中期主要集中在一年中的第26—30周左右,并在1978年前后有1~3周不同幅度的滞后和提前,且南方以推迟为主,北方以提前为主;中国整体降水集中期波动呈现微弱减少趋势,且1978年前显著减少,但1978年后显著增加.
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| 关 键 词： | 降水集中度 降水集中期 中国 区域差异 时空格局 |
Variations in the spatiotemporal patterns of precipitation concentration degree and precipitation concentration period from 1951 to 2012 in China |
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| Institution: | 1) State Key Laboratory of surface processes and resource ecology,Beijing Normal University,100875,Beijing; 2) Institute of disaster reduction and emergency management,Ministry of education,Beijing Normal University,100875,Beijing; 3) Key Laboratory of environmental evolution and natural disaster,Ministry of education,Beijing Normal University,100875,Beijing |
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| Abstract: | The year of 1 978 was taken as a dividing point in the study of variations in precipitation concentration degree (PCD)and precipitation concentration period (PCP ).It was found that PCD had a significant north-south pattern,but PCD had a significant east-west pattern in Northern China.Fluctuations in PCD showed a decreasing trend,PCD fluctuations were larger pre-1 978 and smaller post-1 978.PCP mainly fell between 26 and 30 weeks,1-3 weeks of advance or lag were noted.Southern-based PCP mainly postponed, Northern-based PCP advanced.PCP showed a weak decreasing trend,with significant reduction pre-1 978 and significant increase post-1 978. |
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| Keywords: | precipitation concentration degree (PCD) precipitation concentration period (PCP) China regional differences spatial and temporal pattern |
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