羊卓雍湖流域湖水稳定同位素循环过程研究  

A preliminary Study of Stable Isotope Cycle Processes in Lake Water in the Yamzho Lake Basin

作　　者：巩同梁[1] 田立德[2] 刘东年 姚檀栋[2] 尹常亮[4] 余武生[2] 刘忠方[2] 

机构地区：[1]北京师范大学水科学研究院 [2]中国科学院青藏高原研究所环境与过程实验室,北京100085 [3]青海省海西洲气象局,青海德令哈817000 [4]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2007年第6期914-920,共7页Journal of Glaciology and Geocryology

基　　金：国家重点基础研究发展计划(973计划)项目(2005CB422002);国家科技攻关计划项目(2005BA901A11);中国科学院重要方向项目(KZCX3-SW-339);国家自然科学基金创新群体项目((40121101);国家自然科学基金委项目(40571039)资助

摘　　要：基于卓雍错流域2004年降水、河水、湖水中δ^18O的监测结果，结合内陆湖水循环稳定同位素蒸发分馏模型，探讨了青藏高原南部羊卓雍湖水中稳定同位素的变化过程．研究表明：羊卓雍现代湖水中-5．9‰的δ^18O平均值，相对应于当地相对湿度介于54％～58％的气候条件下，这是湖水蒸发分馏作用的最后结果．此外，入湖河水中δ^18O变化也对湖水中平衡δ^18O有一定的影响，而湖水温度的直接影响可以乎略．湖水中δ^18O对入湖水δ^18O的波动的调节能力很强，对于入湖水中δ^18O大的波动，只有不到50a的时间，湖水中稳定同位素会重新达到平衡．The stable isotope change in the Yamzho Lake Basin is discussed based on the observed results of stable isotope of precipitation, river and lake water in 2004 and on the stable isotope fractionation model in a closed lake. This study shows that the present -- 5.9‰ of Yamzho Lake δ^18O is related to the eventual steady lake δ^18O after evaporation enrichment under the relative humidity of around54%-58%. It is also found that the input δ^18O to the closed lake has also affected the eventual δ^18O after evaporation enrichment. However, the impact of the lake water temperature has little effect on the steady lake δ^18O. The lake itself has a strong adjustment to the input δ^18O change. For the large change of input δ^18O, the Yamzho Lake δ^18O can reach another steady state in less than 50 years.

关 键 词：羊卓雍湖 Δ^18O 水循环过程 

分 类 号：P339[天文地球—水文科学]