干旱区生态环境知识资源中心(Arid): 近52年渭河流域气候变化及极端干湿事件演变特征分析

Arid

	近52年渭河流域气候变化及极端干湿事件演变特征分析
其他题名	Temporal and Spatial Characteristics of Climate Change and Extreme Dry and Wet Events in Wei River Basin in Last 52 Years
	蒋冲; 王飞; 穆兴民; 李锐
来源期刊	灌溉排水学报
ISSN	1672-3317
出版年	2012
卷号	31 期号:4 页码:32-36
中文摘要	利用渭河流域及其周边区域23个站点19592010年的逐日气象数据,通过Penman-Monteith公式计算潜在蒸散量(ET0)和湿润指数。采用气候倾向率、标准化指数、相关分析等方法就该地区气候变化和极端干湿事件的变化特征及其影响因素进行了分析。结果表明,①渭河流域气温分布呈东南向西北递减格局,近52年呈升温趋势(0.2℃/10a,P<0.001),升温较快的区域位于子午岭林区、陇东和丘陵沟壑区一带。降水分布东南高西北少,52年来呈减少趋势(-2.2mm/10a,P>0.1),减幅较大的区域位于关中和陇东一带。②湿润指数整体呈下降趋势,由南向北干旱化加剧,黄土高原丘陵沟壑区最干,秦岭和关中地区最湿。③极端干旱事件频率在波动中增加,频率5次及以上的年份占48%,极大值出现在20世纪90年代中期;极端湿润事件频率在波动中减少,20世纪60年代至今气候干湿演替规律依次为湿干湿干干。
英文摘要	Based on the daily data of 23 meteorological stations from 1959 to 2010,the potential evaporation(ET0) and humid index were calculated using the Penman-Monteith model.By using the method of Spline interpolation,climatic trend rate,normalized ratio and correlation analysis,the temporal and spatial variations of humid index,extreme arid and wet events as well as its influential factors were discussed.The main results were as follows: ①In the period of 1959-2010,the yearly average temperature decreased from the southeast to northwest of basin.Temperature presented an significant increasing trend,with a linear fitting rate of the annual temperature change curves being 0.2 ℃/10a.Higher increasing rate appeared in Ziwu Mountain,the eastern part of Gansu Province and hilly and gully region.The annual precipitation decreased from the southeast to northwest of basin.Precipitation presented an insignificant decreasing trend,with a linear fitting rate of the annual precipitation change curves being-2.2 mm/10a.Higher decreasing rate appeared in central part of Shaanxi Province and the eastern part of Gansu Province.②The humid index was decreasing,but Guanzhong Region presented a slight trend of becoming wet;The result indicated that,drought phenomenon increased gradually from south to north,with driest condition in the loess hilly gully region and the wettest condition in Guanzhong Region and Qin Mountain;③The whole basin showed an increasing trend of extreme event frequency with the fluctuations of arid extreme events.Frequency which was above 5 accounted for 48% of total samples and the maximum value appeared in 1990s.Extreme wet event frequency decreased under the fluctuations of humid index,and the variation of climate was wet-dry-wet-dry-dry since 1960s.
中文关键词	渭河流域 ; 气候变化 ; 湿润指数 ; 极端干湿事件 ; 时空特征
英文关键词	Wei River Basin climate change humid index extreme arid and wet event temporal and spatial characteristics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:4626895
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228196
作者单位	西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国
推荐引用方式 GB/T 7714	蒋冲,王飞,穆兴民,等. 近52年渭河流域气候变化及极端干湿事件演变特征分析[J]. 西北农林科技大学,2012,31(4):32-36.
APA	蒋冲,王飞,穆兴民,&李锐.(2012).近52年渭河流域气候变化及极端干湿事件演变特征分析.灌溉排水学报,31(4),32-36.
MLA	蒋冲,et al."近52年渭河流域气候变化及极端干湿事件演变特征分析".灌溉排水学报 31.4(2012):32-36.