Precipitation stable isotope regional difference in Shiyang River basin
YUAN Rui-feng1, JIA Wen-xiong1, LI Zong-xing2, XU Xiu-ting1, ZHANG Zhi-yuan1, SHI Yang1, YANG Le1, XIONG Hui1
1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;
2. Key Laboratory of Ecohydrology of In-land River basin, Gansu Hydrology and Water Resources Engineering Research Center, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
In order to better understand the changing process of precipitation stable isotope and its influencing factors in arid inland river basins, based on the oxyhydrogen stable isotope data and corresponding meteorological data of 497 precipitation samples from 8 stations in desert area, oasis area and mountain area of Shiyang river basin from July 2013 to July 2014, the spatiotemporal change, environmental effect and water vapor source of precipitation stable isotope of Shiyang river basin were studied. The slope and intercept of the local atmospheric water line in Shiyang river basin showed the trend of low in summer and high in winter. The stable isotope of precipitation showed the trend of high in summer and low in winter, the value of stable isotope decreased with the increase of altitude from desert area, oasis area to mountain area, and the altitude effect was -0.22‰/100m, which was another manifestation of the temperature effect. The stable isotopes of precipitation in the basin showed significant temperature effect with a variation range of 0.43‰/℃, and the precipitation effect was shown under the influence of monsoon water vapor and precipitation washing process on the weather scale. The source of precipitation in the basin was mainly controlled by the west wind water vapor, summer and winter will also be affected respectively by the monsoon water vapor and the polar air mass.
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