Comparison of GCM-simulated isotopic compositions of precipitation in arid central Asia  

亚洲中部干旱区降水同位素的GCM模拟（英文）

作　　者：王圣杰 张明军 陈粉丽 车彦军 杜铭霞 刘杨民 

机构地区：[1]College of Geography and Environmental Science, Northwest Normal University

出　　处：《Journal of Geographical Sciences》2015年第7期771-783,共13页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.41161012,No.41461003;National Basic Research Program of China,No.2013CBA01801

摘　　要：The isotope-equipped GCMs （general circulation models） are useful tools to investigate the isoscape in precipitation and water vapor, especially for the regions without enough in-situ observations. To study the spatial distribution and seasonal variation of precipitation isotopic composition in arid central Asia, several isotope-equipped GCMs are applied, and the long-term observations in two stations are used to verify the GCM-simulated results. Generally, seasonality of isotopic composition can be well simulated in each GCM, and the values of 6180 in precipitation are larger in summer months （from April to October） and lower in winter months （from November to March）. Higher latitude usually shows lower values of 6180 in precipitation, and lower latitude has higher values. The values of 5180 are relatively low in the eastern section, and higher in the western section. Among these simulations, ECHAM is good at describing the isotopic composition in the study region, which can be seen from the mean absolute error （MAE） and root-mean-square error （RMSE）. The ECHAM-derived values of 5180 in precipitation positively correlate with the observed series, and the correlation coefficient based on ECHAM is the largest among these GCMs.The isotope-equipped GCMs （general circulation models） are useful tools to investigate the isoscape in precipitation and water vapor, especially for the regions without enough in-situ observations. To study the spatial distribution and seasonal variation of precipitation isotopic composition in arid central Asia, several isotope-equipped GCMs are applied, and the long-term observations in two stations are used to verify the GCM-simulated results. Generally, seasonality of isotopic composition can be well simulated in each GCM, and the values of 6180 in precipitation are larger in summer months （from April to October） and lower in winter months （from November to March）. Higher latitude usually shows lower values of 6180 in precipitation, and lower latitude has higher values. The values of 5180 are relatively low in the eastern section, and higher in the western section. Among these simulations, ECHAM is good at describing the isotopic composition in the study region, which can be seen from the mean absolute error （MAE） and root-mean-square error （RMSE）. The ECHAM-derived values of 5180 in precipitation positively correlate with the observed series, and the correlation coefficient based on ECHAM is the largest among these GCMs.

关 键 词：GCM isotopic composition PRECIPITATION central Asia 

分 类 号：P426.612[天文地球—大气科学及气象学]