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 |
蒋冲; 王飞; 穆兴民; 李锐 | |
2012 | |
发表期刊 | 灌溉排水学报 |
卷号 | 31期号:04页码:32-36 |
摘要 | 利用渭河流域及其周边区域23个站点1959—2010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; Based on the daily data of 23meteorological stations from 1959to 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-2.2mm/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;③ The whole basin showed an increasing trend of extreme event frequency with the fluctuations of arid extreme events.Frequency which was above 5accounted 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. |
关键词 | 渭河流域 Wei river basin 气候变化 Climate change 湿润指数 Humid index 极端干湿事件 Extreme arid and wet event 时空特征 Temporal and spatial |
语种 | 中文 |
文献类型 | 期刊论文 |
条目标识符 | sbir.nwafu.edu.cn/handle/361005/5323 |
专题 | 水保所知识产出(1956---) |
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]. 灌溉排水学报,2012,31(04):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(04),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 31.04(2012):32-36. |
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