Characteristics and Influencing Factors of the Hydrogen and Oxygen Isotopes in Summer Water Bodies in the Bangong Lake Basin,Northwest Tibetan Plateau
The Bangong Lake basin in northwestern Tibetan Plateau is geographically challenging to access and lacks effective hydrological data.In order to understand the regional water cycle and climate,a total of 34 water samples,including lake water,river water,glacial meltwater,and groundwater,were collected from this region during the summer.Moreover,the study revealed the variation characteristics of hydrogen and oxygen isotopes,deuterium excess parameters,and their relationships with the water salinity,elevation,longitude,latitude,and global rainfall patterns,as to investigate the environmental indications of hydrogen and oxygen isotopes in the regional water cycles.The results show that the values of δ2 H and δ18 O in the water samples ranged from-112.37‰ to-24.90‰ and from-14.84‰ to 2.01‰,respectively.The mean values and standard devia-tions were-76.73‰±26.49‰ for δ2H and-8.43‰±5.24‰ for δ18O.Among them,the values of δ2H and δ18O were found to be the highest in lake water samples and the lowest in the glacial meltwater samples.The continental effect of hydrogen and oxygen isotopes was not evident in the study area,and certain water bodies exhibit an elevation effect.The hydrogen and oxygen isotope lines of each water body show that meltwater in the study area was more susceptible to atmospheric rainfall compared to other water bodies.The smaller inter-cept and slope values for the other water bodies indicate that atmospheric rainfall was not a major source of recharge and was characterized by evapotranspiration.The δ2H and δ18O values of rivers exhibit an increasing trend along the course,also reflecting the characteristics of strong evaporation.The relationship between deute-rium excess parameters and salinity indicated that evaporation was the main factor affecting the variation of hydrogen and oxygen isotopes.
Bangong Lake basinhydrogen and oxygen isotopedeuterium excess parameterspatial distribu-tionisotopic effect
国家科技期刊平台
NSTL
万方数据
维普
