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Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957-2016 in Iran based on CRU TS gridded dataset

查看全文 作　　者：Brian [1]COLLINS;Hadi RAMEZANI [2]ETEDALI;Ameneh [3]TAVAKOL;Abbas [2]KAVIANI 高影响力作者 机构地区：[1]College of Science and Engineering,James Cook University,Townsville,QLD 4811,Australia;[2]Department of Water Sciences and Engineering,Imam Khomeini International University,Qazvin 34148,Iran;[3]Biological and Agricultural Engineering,Kansas State University,Manhattan,KS 66506,USA高影响力机构 出　　处：《Journal of Arid Land》索引2021年第13卷第8期,共21页高影响力期刊 摘　　要：Agriculture needs to produce more food to feed the growing population in the 21st century.It makes the reference crop water requirement(WREQ)a major challenge especially in regions with limited water and high water demand.Iran,with large climatic variability,is experiencing a serious water crisis due to limited water resources and inefficient agriculture.In order to overcome the issue of uneven distribution of weather stations,gridded Climatic Research Unit(CRU)data was applied to analyze the changes in potential evapotranspiration(PET),effective precipitation(EFFPRE)and WREQ.Validation of data using in situ observation showed an acceptable performance of CRU in Iran.Changes in PET,EFFPRE and WREQ were analyzed in two 30-a periods 1957-1986 and 1987-2016.Comparing two periods showed an increase in PET and WREQ in regions extended from the southwest to northeast and a decrease in the southeast,more significant in summer and spring.However,EFFPRE decreased in the southeast,northeast,and northwest,especially in winter and spring.Analysis of annual trends revealed an upward trend in PET(14.32 mm/decade)and WREQ(25.50 mm/decade),but a downward trend in EFFPRE(-11.8 mm/decade)over the second period.Changes in PET,EFFPRE and WREQ in winter have the impact on the annual trend.Among climate variables,WREQ showed a significant correlation(r=0.59)with minimum temperature.The increase in WREQ and decrease in EFFPRE would exacerbate the agricultural water crisis in Iran.With all changes in PET and WREQ,immediate actions are needed to address the challenges in agriculture and adapt to the changing climate. 关 键 词：EVAPOTRANSPIRATION reference crop water requirement effective precipitation TREND Iran spatiotemporal change CRU TS data
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