摘要
降水中的稳定同位素作为研究水循环中的重要组成部分,可综合反映出自然地理环境及气候变化.本文依据1980—2007年第二次稳定水同位素比较小组SWING2中的5种大气环流模式(GCM)与全球降水同位素观测信息网(GNIP)实测数据,分析比较了黄土高原区降水稳定同位素的季节性时空特征变化.研究结果表明,由LMDZ(free)模拟的当地大气水线δD=7.448×δ^(18)O+3.608更接近于实测结果,而MIROC模拟的LMWL相关系数R^(2)高达0.999;5种GCM模拟中的δ^(18)O与δD均表现出明显的季节变化,即夏季大于冬季.d值结果再次验证了该区域夏季具有高湿度、蒸发慢、低d值,而冬季具有湿度低、蒸发快、高d值的特点.在纬度效应分析中,高纬度较低纬度中的δ18O值明显偏低.
As an important part in the study of water cycle,stable isotopes in precipitation can comprehensively reflect the natural geographical environment and climate change.Based on the simulations of five isotope-equipped GCMs released by Stable Water Isotope Intercomparison Group(SWING2)and measured data of GNIP from 1980—2007,the spatial distribution and seasonal variation of stable isotopes in precipitation are analyzed and compared in Loess Plateau.Research indicated that local meteoric water line(LMWL)(δD=7.448×δ^(18)O+3.608)simulated by LMDZ(free)is closer to that of measured data,that correlation coefficient(R^(2))between LMWL simulated by MIROC and measured data of GNIP is 0.999,and that the values of δ^(18)O and δD in precipitation for the five models in summer are higher than those in winter.Compared to winter,humidity and d-excess are high while evaporation is slow in summer.What′s more,the value of δ^(18)O is much lower in high latitudes.
作者
周鑫
陈粉丽
刘雪媛
钱瑞
王生晖
武茜茜
ZHOU Xin;CHEN Fenli;LIU Xueyuan;QIAN Rui;WANG Shenghui;WU Xixi(College of Geography and Environmental Sciences,Northwest Normal University,Lanzhou,730070,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第4期1179-1186,共8页
Environmental Chemistry
基金
甘肃省高等学校协同创新团队项目(2018C-02)资助。
关键词
水汽输送
稳定同位素
GCM
纬度效应
water vapor transport
stable isotope
GCM
latitude effect
