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| 水体蒸发过程中稳定同位素的分形机制 | |
| 引用本文： | 章新平,田立德,刘晶淼.水体蒸发过程中稳定同位素的分形机制[J].地理学报(英文版),2005,15(3):375-384. |
| 作者姓名： | 章新平 田立德 刘晶淼 |
| 作者单位： | 1. College of Resources and Environmental Sciences，Hunan Normal University，Changsha 410081，China; 2. Cold and Arid Regions Environmental and Engineering Research Institute，CAS，Lanzhou 730000，China; 3. Chinese Academy of Meteorological Sciences，Beijing 100091，China |
| 摘 要： | The variations of stable isotopes in atm ospheric vapor and precipitation are caused by stableisotopic fractionation during phase changes in w ater cycle. The isotopic fractionation m ainlyhappens in the m ass transportation of stable isotopes from free w… |
| 关 键 词： | 水体蒸发 稳定同位素 分形机制 水蒸汽 水地球化学 |
| 收稿时间： | 2004-12-13 |
| 修稿时间： | 2004-12-132005-02-28 |
Fractionation mechanism of stable isotope in evaporating water body |
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| Zhang Xinping Ph.D.,Tian Lide,Liu Jingmiao.Fractionation mechanism of stable isotope in evaporating water body[J].Journal of Geographical Sciences,2005,15(3):375-384. | |
| Authors: | Zhang Xinping PhD Tian Lide Liu Jingmiao |
| Institution: | 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China 2. Cold and Arid Regions Environmental and Engineering Research Institute,CAS, Lanzhou 730000, China 3. Chinese Academy of Meteorological Sciences, Beijing 100091,China |
| Abstract: | Under Rayleigh equilibrium condition, stable isotopic ratio in residual water increases with the decrease of the residual water proportionf exponentially, and the fractionation rate of stable isotopes is inversely proportional to temperature. However, under kinetic evaporation condition, the fractionation of stable isotopes is not only related to the phase temperature but also influenced by the atmospheric humidity and the mass exchange between liquid and vapor phases. The ratioδ in residual water will not change withf after undergoing evaporation of a long time for great relative humidity. The rate that the evaporating water body reaches isotopic steady state is mainly dependent on the relative humidity in atmosphere. The analysis shows that the actual mean linear variety rates, about −30.0, of the δ18O in residual water versus the residual water proportion at Nagqu and Amdo stations are consistent with the simulated process under temperature of 20 °C and relative humidity of 50%. The distillation line simulated under Rayleigh equilibrium condition is analogous to the global meteoric water line (MWL) as the temperature is about 20 °C. Under non-equilibrium condition, the slope and constant values of distillation line are directly proportional to temperature and relative humidity. According to the basic data, the simulated distillation line is very consistent with the actual distillation line of Qinghai Lake. |
| Keywords: | stable isotope evaporation kinetic fractionation distillation line water body |
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