热带地理Issue(6)：776-782,7.
长沙地区蒸发皿水体蒸发过程中稳定同位素的变化特征
Variation of Stable Isotopes in Pan Water Evaporation Process in Changsha
摘要
Abstract
The fractionation of stable isotope in evaporation water is highly related to meteorological factors. Four groups of outdoor experiments were conducted in Changsha during summer in order to understand the stable isotopes variation in residual water in the process of evaporation and the relation between ratio of water isotopes and temperature, humidity. Two pans of water with different isotope value were put in thermometer shelters individually to evaporate. The thermometer shelters secured the pan water to keep off the rain directly. During the evaporation program we took water samples each 2 or 3 days from each pan and recorded the residual water mass at the same time. The result of evaporation experiments in Changsha shows that:The stable isotopes in residual water were enriched along with the decrease of residual water mass but showed a decrease during precipitation. The relation between residual water ratio f andδ2H,δ18O fit the Rayleigh model well neglecting the disturbance of precipitation. Higher temperature brought stronger fractionation and higher variation of isotope value in residual water. The value of isotopes in residual water showed a negative correlation with relative humidity especially in the later period of evaporation. It might be caused by the tiny water drop in the air during the precipitation. The slope and intercept of evaporation line were much lower than the precipitation line’s but close to those of the evaporation line of the Xiangjiang River. It is suggested that evaporation pan experiment could simulate evaporation in nature to some extent.关键词
蒸发皿/稳定同位素/水体蒸发/长沙Key words
evaporation pan/stable isotopes/water evaporation/Changsha分类
天文与地球科学引用本文复制引用
黄煌,章新平,李广,黄一民,廖梦思..长沙地区蒸发皿水体蒸发过程中稳定同位素的变化特征[J].热带地理,2014,(6):776-782,7.基金项目
国家自然科学基金项目（41171035）；湖南省重点学科建设项目（2012001）；湖南省研究生科研创新项目基金 （）
