降水稳定同位素的iAWBM模拟及其与GNIP实测值的比较  

Comparison of stable isotopes in precipitation simulated by iAWBM with GNIP observations

作　　者：张婉君[1] 章新平[1] 姚天次 王学界 ZHANG Wanjun ZHANG Xinping YAO Tianci WANG Xuejie(College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081)

机构地区：[1]湖南师范大学资源与环境科学学院,长沙410081

出　　处：《环境科学学报》2017年第2期538-544,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.41571021;41171035);湖南省重点学科建设项目(No.2015001);湖南重特大干旱机理研究项目(No.2015001);湖南省研究生科研创新项目(No.CX2016B209)~~

摘　　要：利用iAWBM的模拟数据,分析了全球降水中平均δ^(18)O、δ^(18)O季节差、降水量效应和温度效应的空间分布以及全球大气水线(MWL),模拟结果与GNIP监测数据进行了比较.结果表明,iAWBM的模拟很好地再现了全球降水中稳定同位素的纬度效应、大陆效应和高度效应;模拟的δ^(18)O季节差的空间分布与实际分布基本对应,在北半球低纬度地区,δ^(18)O的季节差主要表现为负值,而在高纬度大陆地区主要表现为正值;模拟的δ^(18)O的降水量效应主要出现在中低纬度的海洋和季风区,温度效应主要出现在中高纬度的内陆地区,这与实测结果吻合;模拟的全球MWL为δ~2H=7.93δ^(18)O+10.19,该方程的斜率和截距均与实测结果相近.Using simulation data from the isotope enabled atmospheric water balance model（ iAWBM）. The spatial variations of stable isotopic effects in precipitation are analyzed in order to assess the validity on stable isotopes in precipitation simulated by iAWBM and improve the understanding of the stable water isotope cycle in the globe,through the comparison between simulations and GNIP observations. The simulations of iAWBM reproduce well the latitude effect,continent effect,altitude effect and seasonality of δ^18O in global precipitation. The simulated amount effect occurs mainly in low-mid latitude oceans and monsoon areas,and the simulated temperature effect mainly in mid-high-latitude continents. The simulated global meteoric water line（ GMWL）,δ-2H = 7.93 δ^18O＋10.19,is very close to observed one.

关 键 词：iAWBM GNIP 稳定同位素 模拟 比较 

分 类 号：X51[环境科学与工程—环境工程]