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| Temporal and spatial variation characteristics of hydrogen and oxygen isotopes in Yarlung Zangbo River |
| LIU Jia-ju1,2,3, GUO Huai-cheng2 |
1. College of Architecture and Landscape Design, Peking University, Beijing 100871, China;
2. Sciences and Engineering, Peking University, Beijing 100871, China;
3. Institute of Landscape Architecture, Peking University, Beijing, 100871, China |
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Abstract In order to reveal the changing law of the water vapor cycle process in the basin, and reveal the relationship between stable isotopes of river water and meteorological elements and altitude. In 2018, 90 water samples were collected from the main stream of the Yarlung Zangbo River in three periods of high, flat, and dry. The hydrogen and oxygen isotope composition of the river water were analyzed and the relationship between stable isotopes of surface water and meteorological elements and altitude was revealed. The main contents and results of the study are as follows:the spatial variation characteristics of hydrogen and oxygen isotopes in precipitation in the Yarlung Zangbo River Basin were studied using the quantitative relationship model of δ18O with latitude and altitude.It is found that the change of δ18O value in precipitation showed a trend of low in the east and west (upper and lower reaches of the Yarlung Zangbo River) and the high and middle parts (the middle reaches of the Yarlung Zangbo River). The hydrogen and oxygen isotope equations of the river water during the rich, flat and dry periods of the Yarlung Zangbo River had been established. The study found that the slope of the linear equation of δD and δ18O was lower than the atmospheric precipitation line in China. River water δD and δ18O had certain seasonal characteristics, which were more affected by atmospheric precipitation. The high water period was more obvious than the normal water period and the dry period; The spatial characteristics δ18O in the Yarlung Zangbo River were shown as the overall performance from west to east of the trend of first decreasing and then increasing, the north-south space shows a trend of increasing δD-δ18O of river water from south to north. The δD-δ18O value had a weak negative correlation with altitude; Affected by surface evaporation fractionation, precipitation cloud cluster migration and rock weathering in the basin, the water d value of the Yarlung Zangbo River had seasonal and spatial changes significantly.
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Received: 01 March 2021
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