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暴雨灾害  2018, Vol. 37 Issue (3): 219-229    DOI: 10.3969/j.issn.1004-9045.2018.03.004
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近40 a河南省夏季降水变化特征分析
王新伟1,平凡2,姬兴杰3,李梦夏4,刘晓迎1
1. 河南省气象服务中心,郑州 450003; 2. 中国科学院大气物理研究所云降水物理与强风暴重点实验室,北京100029;
3. 河南省气候中心,郑州 450003; 4. 河南省气象科学研究所,郑州 450003
Analysis on variation trend of summer precipitation in Henan
province during the recent 40 years
WANG Xinwei1,PING Fan2,JI Xingjie3,LI Mengxia4,LIU Xiaoying1
1. Henan Provincial Meteorological Service Center, Zhengzhou 450003; 2. Laboratory of Cloud-Precipitation Physics and Severe Storms
(LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing
100029; 3.
Henan Climate Center,
Zhengzhou
450003; 4. Henan Institute of Meteorological Science, Zhengzhou 450003
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摘要 基于河南省111个气象站1971—2010年的逐日降水数据,分析了河南省夏季不同强度降水事件的时空演特征。结果表明:近40 a来,河南省夏季降雨量整体呈上升趋势,各等级降水事件对夏季降雨量贡献率依次是:小雨、中雨、大雨及暴雨,其中小雨和中雨对夏季降雨量的贡献呈下降趋势,而大雨和暴雨对夏季降雨量的贡献呈上升趋势;大部分区域在降雨量增加同时,降雨日数却在减少,即降雨呈现出极端化发展的趋势。借助小波分析表明,降雨量、降雨日数和降雨
强度均表现出2~3 a左右的低频振荡周期,且降雨量和降雨日数的周期具有较好的一致性。为探究降水变化成因,本文对河南省夏季旱涝年大气环流场进行了合成分析,分析表明:偏旱年其500 hPa高空的100°E)以东大部分区域为位势高度正距平区,不利于东部的冷空气南下,850 hPa低空盛行偏北风且多下沉运动,水汽较难输送到河南省上空;而偏涝年高空110°E以东为位势高度负距平区,短波槽活动频繁,110°E以西为高压脊区,其低空多偏南风,有利于孟加拉湾的暖
湿气流北上,配合较强的垂直上升运动,旺盛的对流和充足的水汽均利于降水过程的发生。
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作者相关文章
王新伟
平凡
姬兴杰
李梦夏
刘晓迎
关键词河南省;   夏季降水;   降水特征;   时空演变     
Abstract: Based on data at 111 basic meteorological stations in Henan province from 1971 to 2010, the spatial and temporal characteristics of summer precipitation events were analyzed. The results show that in the last four decades, the amount of summer rainfall in Henan province is increasing. The contribution level of each precipitation events for summer rainfall rate is in the following order: light rain, moderate rain, heavy rain and rainstorm. The contribution of light rain and moderate rain to summer precipitation is decreasing, while the contribution of heavy rain and rainstorm is increasing. In most regions, the amount of precipitation increases while the days of rainstorm decreases, indicating the more frequent of extreme precipitation events. Wavelet analysis shows that the precipitation, precipitation intensity and the number of days of heavy precipitation all have the oscillation period of 2-3a, and the cycles of precipitation and rain days are consistent. In order to explore the causes of precipitation change, in this paper we conducted an atmospheric circulation field synthetic analysis for the drought and flood years, respectively. Analysis shows that in drought years, the positive anomaly was in most regions of the east of 100°E at 500 hPa level, and most part of Henan province were located in the descending-motion zone. Therefore, water vapor is difficult to transport to Henan province. On the contrary, the negative anomaly and frequent short-wave activity were found in most regions in the east of 110°E during flood years. The region of the west of 110°E during flood years was controlled by the high pressure ridges, and the southerly wind in lower level carried the warm moist flow from the Bay of Bengal to Henan. Therefore, the strong convection and sufficient water vapor are beneficial to precipitation.
Key wordsHenan province;   summer precipitation;   precipitation characteristics;   spatial and temporal evolution   
引用本文:   
王新伟, 平凡, 姬兴杰,等 .2018. 近40 a河南省夏季降水变化特征分析[J]. 暴雨灾害, 37(3): 219-229.
WANG Xin-Wei, PING Fan, JI Xing-Jie, et al .2018. Analysis on variation trend of summer precipitation in Henan
province during the recent 40 years[J]. Torrential Rain and Disasters, 37(3): 219-229.
 
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