摘要
以1961—2013年河南省17个站点逐日降水量数据为研究对象,运用Sen′s倾向估计、Mann-Kendall显著性检验和空间插值等方法,分析了河南省11个极端降水指数时间和空间变化特征及其影响因素。结果表明:(1)过去53年,河南省极端降水指数变化趋势不显著。(2)河南省区域内,东南部极端降水量、降水日数、降水强度大于西北部。过去53年,商丘和西华降水量、降水日数和降水强度显著增加,而安阳、新乡、孟津、三门峡等地显著减少。(3)将河南省极端降水指数与其他区域进行了比较表明,极端降水指数存在区域性差异。(4)极端降水指数与纬度因素之间相关性强于经度和海拔因素。(5)除CDD指数外,其余指数与年总降水量均具有较高相关性。其中,极端降水量(R95p)、年降水日数降水量(R10,R20和R25)对年总降水量贡献最大。
Daily precipitation data of 17 meteorological stations in Henan Province during 1961-2013 were selected in this study.Some methods,including Sen′s tendency estimation,Mann-Kendall test and spatial analysis,were applied to detect spatial and temporal characteristics of eleven indices of extreme precipitation across Henan Province and their impact factors.The results showed that:(1)extremes precipitation indices across Henan Province presented an indistinctive variation trend during the last 53 years;(2)the extreme precipitation,rainfall days and intensities of precipitation in southeastern Henan Province were stronger than in northwest;the extreme precipitation,rainfall days and intensities of Shangqiu and Xihua exhibited significant increasing trend during the recent 53 years,and presented the decreasing trend in Anyang,Xinxiang,Mengjin and Sanmenxia areas;(3)compared with other regions,variation trend of extreme precipitation indices in Henan Province was different from the results found in the other regions of China,which exhibited regional difference;(4)the correlation between extreme precipitation indices and latitudes was much more significant than those between longitudes and altitude factors;(5)except for CDD,indices had close correlations with annual precipitation amounts.The precipitation of R95p,R10,R20 and R25 mostly contributed to annual total precipitation amount.
作者
赵国永
韩艳
刘明华
侯俊丽
时海萍
刘维真
郭伊利
乔强
ZHAO Guoyong;HAN Yan;LIU Minghua;HOU Junli;SHI Haiping;LIU Weizhen;GUO Yili;QIAO Qiang(School of Geographic Sciences,Xinyang Normal University,Xinyang,Henan 464000,China;Key Laboratory of Climate Change and Environmental Evolution,Xinyang Normal University,Xinyang,Henan 464000,China;Research Center of North and South Transition Zone in China,Xinyang Normal University,Xinyang,Henan 464000,China)
出处
《水土保持研究》
CSCD
北大核心
2018年第6期115-120,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金(41602187)
河南省科技计划项目(162102310123)
河南省高等学校重点项目(17A170011)
信阳师范学院资助项目(0201306
2015GGJS-01)
关键词
河南省
极端降水指数
时空变化
Henan Province
extreme precipitation indices
spatial-temporal variation
