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《Resources Science》 2010-01
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Analysis of Spatial Distributions and Temporal Trends in Potential Evaporation over Hexi Areas from 1960 to 2008

WANG Yamin,ZHANG Bo,DAI Shengpei,WANG Haijun,GUO Lingxia,KANG Shuyuan(Geographic and Environmental Sciences Department of Northwest Normal University,Lanzhou 730070,China)  
Hexi in Gansu Province,located in a semiarid area of northwestern China,has been drawing more and more attentions in recent years.It is essential to estimate potential evaporation(ET0) with reliable accuracy over semiarid areas where water resources are significantly limited and excessively explored.As such,a reasonable planning and management of available water resources are desirable on the basis of appropriately estimating water resources availability over the area.Investigating spatial and temporal distributions of ET0 over semiarid areas would greatly helpful for irrigation water supply planning and understanding of the impact of climate change on ET0,and moreover,availability of water resources.This would gainfully benefit water saving as well as improvement in water utilization efficiency.It is known that estimation of ET0 requires measurements of meteorological variables,such as solar radiation,air temperatures,wind velocity,and relative humidity.In the present work,the FAO 56 Penman-Monteith equation was utilized to calculate daily ET0 for seventeen meteorological stations in Hexi areas during the period 1960-2008.Spatial and temporal distribution characteristics of ET0 were carefully examined using a series of statistical methods and GIS spatial analysis techniques.The Hurst exponent was also used to forecast the trend of ET0.Causes for spatial distributions and temporal variations in ET0 were discussed in detail.Contributions of different meteorological variables to the temporal trend in ET0 were examined subsequently.Results showed that first ET0 generally exhibited a decreasing trend in Hexi areas.ET0 showed a steady decline at a rate of about 2.76 mm/a from the 1960s to the 1990s.The largest rate of the decline occurred in the 1970s at a rate of about 11.3mm/a.In general,the rate of changes in ET0 was highest in summer,showing-2.07 mm/a,followed by spring,autumn and winter.Second,ET0 showed a decreasing trend from the northwest to the southeast,the minimum happening in the Qilian Mountains.Magnitudes of ET0 mainly concentrated in spring and summer,accounting for 30% and 40% of the total for a year,respectively,followed by autumn and winter.Third,the leading factor affecting ET0 of Hexi areas was wind velocity.It was found that temperature significantly affected ET0 in spring.Forth,changes in ET0 in Hexi areas demonstrated a kind of oscillation characteristic,showing a 12-year cycle.It was also found that ET0 in Hexi areas showed a strong persistence,which indicated that the future trend in ET0 would largely depend on the past 12 years and ET0 of the areas would continuously increase.
【Fund】: 国家自然科学基金项目(编号:40961038);; 公益性行业(气象)科研专项(编号:GYHY200806021-07);; 中国科学院知识创新工程重要方向项目(编号:KZCX2-YW-Q10-4)
【CateGory Index】: P426.2
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