Evapotranspiration integrates atmospheric demand and surface conditions. The Penman-Monteith equation was used to calculate annual and seasonal reference evapotranspiration (ET0) and thermodynamic and aerodynamic components (ETrad and ETaero) at 77 stations across northeast China, 1961–2010. The results were: (1) annual ETrad and ETaero had different regional distribution, annual ETrad values decreased from south to north, whereas the highest ETaero values were recorded in the eastern and western regions, the lowest in the central region; (2) seasonal ETaero distributions were similar to seasonal ET0, with a south–north longitudinal pattern, while seasonal ETrad distributions had a latitudinal east-west pattern; and (3) in the group for ET0 containing 69 sampling stations, effects of climatic variables on ET0 followed sunshine hours > relative humidity > maximum temperature > wind speed. Changes in sunshine hours had the greatest effect on ETrad, but wind speed and relative humidity were the most important variables to ETaero. The decline in sunshine duration, wind speed, or both over the study period appeared to be the major cause of reduced potential evapotranspiration in most of NEC. Wind speed had opposite effects on ETrad and ETaero, and therefore the effect of wind speed on ET0 was not significant.
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Research Article|
September 18 2015
Clustering analysis of regional reference evapotranspiration and its components based on climatic variables across northeast China, 1961–2010 Available to Purchase
Yuan Liu;
Yuan Liu
1Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 1,00081, China; Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China; and National Engineering Laboratory of Efficient Water Use and Crop Disaster Prevention, Beijing 100081, China
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Buchun Liu;
1Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 1,00081, China; Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China; and National Engineering Laboratory of Efficient Water Use and Crop Disaster Prevention, Beijing 100081, China
E-mail: [email protected]
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Xiaojuan Yang;
Xiaojuan Yang
1Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 1,00081, China; Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China; and National Engineering Laboratory of Efficient Water Use and Crop Disaster Prevention, Beijing 100081, China
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Wei Bai
Wei Bai
1Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 1,00081, China; Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China; and National Engineering Laboratory of Efficient Water Use and Crop Disaster Prevention, Beijing 100081, China
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Journal of Water and Climate Change (2016) 7 (1): 128–141.
Article history
Received:
October 26 2014
Accepted:
August 08 2015
Citation
Yuan Liu, Buchun Liu, Xiaojuan Yang, Wei Bai; Clustering analysis of regional reference evapotranspiration and its components based on climatic variables across northeast China, 1961–2010. Journal of Water and Climate Change 1 March 2016; 7 (1): 128–141. doi: https://doi.org/10.2166/wcc.2015.217
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