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| DOI：10.13522/j.cnki.ggps.2016.0225 |
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| Sensitivity and Attribution of Potential Evapotranspiration in Western Liaoning |
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GUO Jinlu, GU Jian, YANG Zhuzhu
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Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| 【Objective】 Study the relationship between ET0 and meteorological factors in a region with specific climate.【Method】 Based on the meteorological dataset during 1965 to 2015 from the thirteen selected meteorological stations of the western Liaoning, the FAO-56 Penman-Monteith method was used to estimate the reference evapotranspiration （ET0）. The variation trend of meteorological variables and ET0 were examined with the Mann-Kendall trend test. Besides, according to sensitivity coefficient, sensitivity of ET0 to meteorological variables and the dominate factor which affects the variation of ET0 were analyzed. 【Result】 The results showed the average ET0 in western Liaoning was 1 007.6 mm/a, decreased at the rate of 12.5 mm/10 a in 1965—2015 and observed a low-high-low distribution pattern from the southwest to northeast. Daily maximum and minimum temperature were significantly increased. Wind speed and solar radiation were significantly decreased and relative humidity didn’t significantly change. Sensitivity of ET0 to meteorological variables were ranked as: relative humidity> maximum air temperature>wind speed>solar radiation>minimum air temperature. And ET0 was negatively correlation with relative humidity, while other meteorological variables showed positive correlation. Contribution rate analysis showed the increased minimum, maximum temperature and decreased relative humidity impacted positively to ET0 variation, and the decreased wind speed and solar radiation impacted negatively. The largest contribution rate to ET0 variation was wind speed, while the relative humidity was lowest. 【Conclusion】 In general, the decreased wind speed was the dominant factor to the ET0 variation in western Liaoning. |
| Key words: potential evapotranspiration; sensitivity; contribution rate; western Liaoning |
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