Water Science and Engineering 2014, 7(3) 250-266 DOI:   doi:10.3882/j.issn.1674-2370.2014.03.002  ISSN: 1674-2370 CN: 32-1785/TV

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Climatic variables
reference evapotranspiration
change trend
Mann-Kendall test
sensitivity analysis
WANG Xu-Ming
Article by Wang,X.M

Climate change trend and its effects on reference evapotranspiration at Linhe Station, Hetao Irrigation District

Xu-ming WANG, Hai-jun LIU*, Li-wei ZHANG, Rui-hao ZHANG

College of Water Sciences, Beijing Normal University, Beijing 100875, P. R. China


Linhe National Meteorological Station, a representative weather station in the Hetao Irrigation District of China, was selected as the research site for the present study. Changes in climatic variables and reference evapotranspiration (ET0 ) (estimated by the Penman-Monteith method) were detected using Mann-Kendall tests and Sen’s slope estimator, respectively. The authors analyzed the relationship between the   change and each climatic variable’s change. From 1954 to 2012, the air temperature showed a significant increasing trend, whereas relative humidity and wind speed decreased dramatically. These changes resulted in a slight increase in  . The radiative component of total   increased from 50% to 57%, indicating that this component made a greater contribution to the increase in total   than the aerodynamic component, especially during the crop growing season (from April to October). The sensitivity analysis showed that   in Hetao is most sensitive to mean daily air temperature (11.8%), followed by wind speed (−7.3%) and relative humidity (4.8%). Changes in sunshine duration had only a minor effect on   over the past 59 years. 

Keywords Climatic variables   reference evapotranspiration   change trend   Mann-Kendall test   sensitivity analysis  
Received 2014-03-18 Revised 2014-05-02 Online: 2014-07-25 
DOI: doi:10.3882/j.issn.1674-2370.2014.03.002
This work was supported by the National Natural Science Foundation of China (Grant No. 51179005) and the Special Fund for Public Welfare Industry of the Ministry of Water Resources of China (Grant No. 201401036).
Corresponding Authors: Hai-jun LIU
Email: shanxilhj@bnu.edu.cn
About author:


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