| 1967-2006年中国东南沿海盛夏降水强度变化特征分析 |
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| 引用本文： | 黄伟,宇如聪,李建.1967-2006年中国东南沿海盛夏降水强度变化特征分析[J].气候变化研究进展,2012,8(3):164-170. |
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| 作者姓名： | 黄伟 宇如聪 李建 |
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| 作者单位： | 1. 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029;中国科学院研究生院,北京100049
2. 中国气象科学研究院,北京,100081 |
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| 基金项目： | 国家重点基础研究发展计划，国家自然科学基金 |
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| 摘 要： | 利用中国地面台站逐日和逐时降水资料,对中国东南沿海地区近40年(1967-2006年)盛夏(7-8月)降水强度变化特征进行了分析.逐日降水资料的分析结果表明我国东南沿海盛夏的降水量呈显著增加趋势,且主要是由日降水强度增强所致,日降水频次的贡献不显著.结合逐时降水资料的分析结果发现,东南沿海地区虽然降水日的平均降水时数显著增加,平均逐时降水强度也显著增强.通过按降水持续时数确定的降水事件分类分析发现,短持续降水(≤4h)平均小时强度显著增强,具体表现为弱小时强度降水减少和强降水增多.长持续性降水(≥15h)平均小时强度减弱,但降水频次增加.由于长持续性降水的平均小时降水强度远大于短时降水平均小时强度,对整体小时强度增强是正贡献.总之,我国东南沿海盛夏平均降水强度增强主要来自长持续性降水频次的增多、短时强降水频次的增多和短时弱降水频次的减少.
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| 关 键 词： | 东南沿海 降水强度 持续时间 盛夏 |
Analysis of Changes in Precipitation Intensity in Later-Summer over Southeast Coast of China in 1967-2006 |
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| Huang Wei
,
Yu Rucong
,
Li Jian.Analysis of Changes in Precipitation Intensity in Later-Summer over Southeast Coast of China in 1967-2006[J].Advances in Climate Change,2012,8(3):164-170. |
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| Authors: | Huang Wei Yu Rucong Li Jian |
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| Institution: | 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3 Chinese Academy of Meteorological Sciences,Beijing 100081,China |
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| Abstract: | Using daily and hourly station rain gauge data during 1967-2006,the changes in the characteristics of the later-summer(July-August) rainfall intensity over southeast coastal China were analyzed.The results depending on the daily rainfall data confirm that the amount of precipitation in southeastern China has significantly increased,which mainly results from the significant increase of daily precipitation intensity while the frequency does not increase significantly.Based on the hourly rainfall data,it is found the hourly intensity of precipitation and duration time are significantly increased simultaneously in this region.Comparing the average precipitation indices during 1967-1986 with that during 1987-2006.It is found the intensity of short duration(≤ 4 h) precipitation increases while that of long duration(≥ 15 h) precipitation decreases and the frequency of long duration precipitation increases.Even so,the average intensity of long duration precipitation is much higher than that of short duration precipitation.In short,the significant increase of the hourly precipitation intensity is resulted from the frequency increase of long duration-and short duration-heavy precipitation and the frequency decrease of short durationslight precipitation in the past 40 years over the southeastern coast of China. |
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| Keywords: | southeastern coast of China precipitation intensity duration time later-summer |
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