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| Temporal-spatial Change of the Sensitivity of Potential Evapotranspiration to Climatic Influencing Factors in Beijing-Tianjin Sand Source Control Project Zone |
| Shan Nan1, Yang Xiaohui1, Shi Zhongjie1, Zhao Xisu2 |
1. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China;
2. Agricultural of Linshu, Linshu 276700, Shandong, China |
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Abstract In this paper, based on daily data at 46 meteorological stations within and around the Beijing-Tianjin Sand Source Control Project Zone during 1959-2011, the sensitivity of potential evapotranspiration to variation of air temperature, wind speed, sunshine duration and relative humidity at different timescales was identified by using the Penman-Monteith equation and non-dimensional sensitivity coefficient. (1)Annual potential evapotranspiration was most sensitive to maximum air temperature, followed by relative humidity, wind speed was the least sensitive variable; In terms of season, the high values of sensitive coefficients of potential evapotranspiration to maximum air temperature and sunshine hours occurred in summer, and the high values of sensitive coefficients of potential evapotranspiration to minimum air temperature, wind speed and relative humidity occurred in winter. (2) The sensitive coefficients of potential evapotranspiration to maximum air temperature, minimum air temperature and relative humidity showed decreasing trend from northeast to southwest, while the sensitive coefficients of potential evapotranspiration to sunshine hours showed increasing trend from northeast to southwest. (3) During 1959-2011, the sensitive coefficients of potential evapotranspiration to maximum air temperature and minimum air temperature showed decreasing trends, while the sensitive coefficients of potential evapotranspiration to wind speed, sunshine hours and relative humidity showed increasing trend. (4) The sensitive coefficients of potential evapotranspiration to maximum air temperature and minimum air temperature decreased with increase of the maximum air temperature and minimum air temperature, while the sensitive coefficients of potential evapotranspiration to sunshine hours and relative humidity increased with decrease of the sunshine duration and relative humidity.
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Received: 08 June 2014
Published: 20 September 2015
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2015, Vol. 35 
