Distribution and Trends in Reference Evapotranspiration in the North China Plain
Distribution and Trends in Reference Evapotranspiration in the North China Plain
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DOI：
10.1061/(asce)ir.1943-4774.0000175
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Zhenwei Song;Hailin Zhang;R. Snyder;F. Anderson;F. Chen
中科院分区：
文献类型：
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作者：
Zhenwei Song;Hailin Zhang;R. Snyder;F. Anderson;F. Chen
参考蒸散量（ETo）的分布和趋势对农业水资源规划极为重要，人们普遍认为，随着全球变暖，ETo的速率将增加。这在中国是一个大问题，华北平原缺水现象很普遍。计算了1961-2006年华北平原及周边地区26个气象站的彭曼-蒙特斯参考蒸散量。分析了ETo的时间变化和空间分布特征，并探讨了ETo变化的原因。结果表明：（1）根据干旱度值将华北平原划分为两个气候区：半干旱区和半湿润区，前者占总面积的69%;（2）在整个华北平原上，年ETo最高的地区出现在中西部，总ETo最低的地区出现在东部。比较月平均和年平均ETo分布，5月以来的高ETo值与年平均ETo值的分布基本一致。
The distribution and trends in reference evapotranspiration ( ETo ) are extremely important to water resources planning for agriculture, and it is widely believed that rates of ETo will increase with global warming. This is a big concern in China, where water deficits are common in the North China Plain (NCP). In this study, Penman-Monteith reference evapotranspiration at 26 meteorological stations during 1961–2006 in and around the NCP was calculated. The temporal variations and spatial distribution of ETo were analyzed and the causes for the variations were discussed. The results showed that: (1) the NCP was divided into two climatic regions based on aridity values: a semiarid region that accounts for 69% of the area and subhumid regions that made of the remaining area; (2) over the entire NCP, the highest annual ETo occurred in the central and western areas and the lowest total ETo was observed in the east. Comparing the mean monthly ETo and annual ETo distributions, the high ETo values from May throug...