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Article

Spatial-Temporal Change of Actual Evapotranspiration and the Causes Based on the Advection–Aridity Model in the Weihe River Basin, China

by 1, 1,2,*, 1,2 and 3
1
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
2
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China
3
Yangtze Soil Conservation Monitoring Center, Changjiang Water Resources Commission, Wuhan 430010, China
*
Author to whom correspondence should be addressed.
Academic Editor: Fernando António Leal Pacheco
Water 2021, 13(3), 303; https://doi.org/10.3390/w13030303
Received: 10 November 2020 / Revised: 20 January 2021 / Accepted: 20 January 2021 / Published: 27 January 2021
(This article belongs to the Section Hydrology)
Evapotranspiration is a key process between the atmospheric hydrological cycle and the energy cycle, which has a great significance in understanding climate change and the rational use of water resources, especially for the Weihe River basin (WRB) (a basin in China experiencing a shortage of water resources). We investigated the spatial-temporal change of actual evapotranspiration (ETa) based on the daily meteorological variables of 22 meteorological stations and the annual streamflow of three hydrological stations from 1970 to 2018 in the WRB. The contributions of key meteorological variables to ETa changes and the sensitivity coefficient are also quantified. The temporal trends of ETa showed an increasing trend from 1970 to 2018, and the spatial distribution of ETa increased from northwest to southeast in the WRB. Increasing trends were detected in the multi-year average, spring, and winter, but only a few stations passed the significance test. Summer and autumn showed a decreasing trend, but this trend was not significant. Solar radiation is the most sensitive meteorological variable, followed by vapor pressure, wind speed, and mean temperature. Vapor pressure contributes the most to ETa changes, followed by solar radiation. In general, vapor pressure (relative humidity) is the dominant meteorological factor affecting ETa in the WRB. In addition to meteorological factors, the ETa is also affected by combined and complicated factors caused by precipitation and human activities. As an important part of the hydrological cycle, ETa has important research significance for water resources management, economy, agriculture, and ecology and results of this study may be helpful to further clarify the climate change and human activities impacts on the basin hydrological cycle. View Full-Text
Keywords: evapotranspiration; complementary relationship; Advection–Aridity model; Weihe River Basin evapotranspiration; complementary relationship; Advection–Aridity model; Weihe River Basin
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MDPI and ACS Style

Xu, R.; Gao, P.; Mu, X.; Gu, C. Spatial-Temporal Change of Actual Evapotranspiration and the Causes Based on the Advection–Aridity Model in the Weihe River Basin, China. Water 2021, 13, 303. https://doi.org/10.3390/w13030303

AMA Style

Xu R, Gao P, Mu X, Gu C. Spatial-Temporal Change of Actual Evapotranspiration and the Causes Based on the Advection–Aridity Model in the Weihe River Basin, China. Water. 2021; 13(3):303. https://doi.org/10.3390/w13030303

Chicago/Turabian Style

Xu, Ruirui, Peng Gao, Xingmin Mu, and Chaojun Gu. 2021. "Spatial-Temporal Change of Actual Evapotranspiration and the Causes Based on the Advection–Aridity Model in the Weihe River Basin, China" Water 13, no. 3: 303. https://doi.org/10.3390/w13030303

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