摘要
蒸发是水文循环的一个重要过程,也是影响区域水资源量的重要因素。通过选取黄土高原50个气象站1959-2015年的逐月气象资料,应用FAO修正的Penman-Monteith模型计算黄土高原潜在蒸发量,采用Mann-Kendall检验与空间插值分析其时空变化特征,探讨各气象要素对潜在蒸发量的影响。结果表明:黄土高原多年平均潜在蒸发量在780~1 470 mm之间,由西北向东南递减。1959-2015年,黄土高原潜在蒸发量变化率为5.64 mm·(10 a)-1;春季变化率最大,其次为夏季和秋季,冬季最小。从空间分布看,西部、中北部地区和东南部地区潜在蒸发量均呈非显著性增加趋势。太阳净辐射量增加是黄土高原潜在蒸发量增加的主导因子,其次为实际水汽压、风速和温度。
Evaporation is an important component of hydrological cycle and key input in hydrological models. Quantification of spatial-temporal variation of potential evapotranspiration （PET） is helpful for better understand- ing climate change and its influence on hydrological cycle and water resources. In this study, the FAO Penman-Monteith was used to estimate the spatial-temporal variation of PET in the Loess Plateau with monthly observed data at 50 meteorological stations during 1959-2015 obtained from the National Meteorological Information Center of China Meteorological Administration. The Spline method was applied for interpolation to obtain the spatial distribution of PET. The sensitivity coefficients method was employed to explore the contribution of key meteorological variables to the variation of PET. The results show that mean annual PETofthe Loess Plateau ranged from 780 mm to 1 470 mm and decreased from northwest to southeast. Seasonally, PET in summer, spring, autumn and winter decreased successively. During 1959-2015, PET showed an upward trend of 5.64 mm. （10 a）-1 in the Loess Plateau. PET showed the highest increasing trend in spring I7.37 ram. （10 a）-ll, followed by summer, autumn and winter. The west part, middle-north part and south-east part of the Loess Plateau showed non-significant increasing trends in PET. The increase of solar radiation is the dominant factor for the increase of PET, followed by actual water vapor pressure, wind speed and temperature. The innovation of this study is using the sensitivity coefficients method to analyze the effects of different meteorological variables on potential evapotranspiration. This study analyzed the spatiotemporal changes of regional PET and the influence of each meteorological variable. The results are favorable to the water resources planning and management, and provide scientific basis for the efficient agricultural water resources exploitation.
出处
《干旱区地理》
CSCD
北大核心
2017年第5期997-1004,共8页
Arid Land Geography
基金
国家重点研发计划(2016YFC0402401)
国家自然科学基金(41671279
41671285)
