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Separating the contributions of climate change and human activities to regional AET variability by using a developed analytical framework

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Abstract

Actual evapotranspiration (AET) is a key factor in land-atmosphere interactions and a major hydrological cycle component. Variations in AET have resulted from a combination of climate change (CC) and human activities (HA). Quantifying the contributions of these two factors to AET dynamics is essential for better understanding hydrometeorological and ecohydrological processes under both natural and anthropogenic conditions. In this study, an analytical framework was adopted for AET variance analysis, and the influences of CC and HA on regional AET variabilities were separated by using this method. AET variance is determined by the variance in CC (\({\sigma }_{AETc}^{2}\)) and HA (\({\sigma }_{AETh}^{2}\)); the former is estimated through a synthesis of the variance/covariance of potential evapotranspiration (ET0) and precipitation (P), and the latter is determined from the residual between the total AET variance and \({\sigma }_{AETc}^{2}\). Based on a 36-year dataset (1980–2015), this framework is applied to the different regions of the Tao River Basin (TRB). The results reveal that climate was the primary factor influencing AET variance in most parts of the basin. Precipitation (P) dominated the \({\sigma }_{AETc}^{2}\) and had a positive effect, while the interactions between P and ET0 tended to suppress this effect, especially in the semihumid areas of the TRB. The contribution rates of CC and HA to basin AET variance were estimated to be 0.76 and 0.24, respectively. The developed analytical framework and its application are beneficial to the management and exploitation of water resources from the perspective of basin ecohydrology.

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Acknowledgements

We are grateful to various institutions, including the Institute of Tibetan Plateau Research, CAS, Meteorological Bureau of China and the GLEAM data sever (www.gleam.eu), for providing open access to data collections and archives. We also appreciate the editors and the reviewers for their suggestions and comments on the paper.

Funding

This study was supported by the National Natural Science Foundation of China (Grant No. 41671017) and the National Key Research and Development Programs of China (Nos. 2017YFC0504801 and 2017YFC0504306).

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Correspondence to Changbin Li.

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Wu, L., Wang, L., Li, C. et al. Separating the contributions of climate change and human activities to regional AET variability by using a developed analytical framework. Stoch Environ Res Risk Assess 34, 1831–1845 (2020). https://doi.org/10.1007/s00477-020-01876-z

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  • DOI: https://doi.org/10.1007/s00477-020-01876-z

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