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Management and scheduling of irrigation water requires consideration of evapotranspiration, one of the most important hydrological variables. This study investigates the variations in the daily potential evapotranspiration (ET 0 ), and its aerodynamic (ET a ) and radiometric (ET r ) components in three areas (western, central and eastern) of the Inner Mongolia Autonomous Region (IMAR) during the growing season (April–September, 2007). In this study, a data-driven approach was followed, and the wavelet transformation analysis method was used to investigate the evapotranspiration characteristics of a relatively large geographic region. The results show that there are close correlations in the variations of ET 0 with those of ET a and ET r . For the western area of the IMAR, the timing of the largest ET a is 1 month earlier and its wave period is 10 days shorter than those of ET 0 and ET r . For the central area, the wave period of ET a is 20 days shorter, and the timing of the largest ET a is approximately 1 month earlier than those of ET 0 and ET r . For the eastern area, there are two large fluctuations in ET a , and they occur 1 month earlier than those of ET 0 .

Wavelet transform analysis of reference crop evapotranspiration during the growing season in three typical regions of Inner Mongolia, China