摘要
利用MUGCM的模拟,云南地区日、月、年时间尺度下降水中稳定同位素的变化、降水量效应以及δD/δ18O之间的关系被分析。无论是在日时间尺度下还是在月、年时间尺度下,降水同位素均存在显著的降水量效应。与实测结果相比,模拟的降水中δ18O与降水量之间具有更强的相关性。对于单站而言,蒙自站和腾冲站的大气水线被较好地模拟。但在思茅站和昆明站,模拟结果未能准确再现实际降水中δD与δ18O的关系,模拟的大气水线斜率比实测结果偏高。这意味着,在云南这个特殊的地区,模式可能高估了HDO的贫化。
Using the MUGCM simulations, the variation features of stable isotopes in precipitation, amount effect and relationship between δD and δ^18O, on the diurnal, monthly and yearly time scales in Yunnan Province, China, are analyzed. There is significant amount effect for the isotopes in precipitation, whether on the diurnal time scale or on the monthly or the yearly time scales. Compared with the measured values, the simulated δ^18O in precipitation shows the stronger correlation with precipitation. For the single station, the local meteoric water line （LMWL） is simulated well at Mengzi and Tengchong, however at Simao and Kunming, the simulated results do not reproduce truly the measured relationship between δD and δ^18O in precipitation with the higher LMWL slopes, which implies that the model may overestimate the depletion of the HDO over such a particular areas like Yunnan.
出处
《地理科学》
CSCD
北大核心
2012年第1期121-128,共8页
Scientia Geographica Sinica
基金
国家自然科学基金项目(40871094)
教育部高等学校博士学科点专项科研基金项目(20094306110006)
湖南省教育厅重点项目(09A056)
湖南省重点学科建设项目(2011001)
中国科学院青藏高原环境变化与地表过程重点实验室开放课题基金(2011004)资助
关键词
云南
稳定同位素
模拟
降水量效应
大气水线
Yunnan
stable isotopes
simulation
amount effect
the meteoric water line （MWL）
