Study on the mechanism of isotope fractionation in soil water during the evaporation process under equilibrium condition |
| |
| Authors: | Xiaoxu Sun Jiansheng Chen Hongbing Tan Wenbo Rao Yongsen Wang Xiaoyan Liu Zhiguo Su |
| |
| Institution: | [1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China [2]College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China [3]Reserch Institute of Science and Technology, Hohai University, Nanjing 210098, China |
| |
| Abstract: | In this study, with the method of vacuum extraction, two evaporative processes of soil water and free water under equilibrium
condition were simulated. For each sample, water vapor was condensed by liquid nitrogen and was collected in four time intervals.
From the analysis of hydrogen and oxygen isotopic compositions of the water collected at different times, it was discovered
that the isotope fractionation of soil water also follows the mode, which is just the same as the evaporative process of free
water. The relationship between the stable hydrogen and oxygen isotopes in residual water showed that the simulative evaporation
line was close to the global meteoric water line (GMWL) under the equilibrium condition at about 20°C. Comparison of the two
types of evaporative processes indicated that the isotope fractionation and evaporation velocity of soil water were only slightly
modified by the Van der Waals force. |
| |
| Keywords: | soil water evaporative process equilibrium condition Rayleigh fractionation |
| 本文献已被 维普 万方数据 SpringerLink 等数据库收录！ |
|
