Sensitivity analysis of potential evapotranspiration to key climatic factors in the Lhasa River Basin
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Abstract:
Evapotranspiration can reflect the impact of climate change on water resources. Based on the daily weather data from 1955 to 2018 at two sites in the Lhasa River Basin, the potential evapotranspiration ( ET0 ) was calculated using the FAO-56-Penman-Monteith formula. The sensitivity analysis, Mann-Kendall trend test , climatic tendency rate, and wavelet analysis were used to analyze the variation law of ET0 in the Lhasa River Basin and its influencing factors. Comparing the changes changing characteristics of of the two stations, the results show that : The whole basin ET0 is the most sensitive to the highest temperature, and the contribution of highest temperature contribution to ET0 was the largest. The sensitivity coefficient of meteorological factors varies vary within the year: relative humidity> max imum temperature> wind speed> sunshine hours> minimum temperature, respectively ; The daily variation trend of ET0 in the basin is was 0.03 mm per 10 years and the increase of ET0 in the watershed by Mann-Kendall was not significant; The ET0 of the basin has a cyclical oscillation on the 25-30 year scale, and there are were obviously 7 cycles of alternating
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