Linkage between precipitation isotopes and water vapor sources in the monsoon margin:Evidence from arid areas of Northwest China

作     者：CHEN Fenli ZHANG Qiuyan WANG Shengjie CHEN Jufan GAO Minyan Mohd Aadil BHAT CHEN Fenli;ZHANG Qiuyan;WANG Shengjie;CHEN Jufan;GAO Minyan;Mohd Aadil BHAT

作者机构：College of Geography and Environmental ScienceNorthwest Normal UniversityLanzhou 730000China Key Laboratory of Resource Environment and Sustainable Development of Oasis of Gansu ProvinceNorthwest Normal UniversityLanzhou 730000China School of Ocean and Earth ScienceTongji UniversityShanghai 200092China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2024年第16卷第3期

页      面：355-372页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China(42161007) the Scientific Research Program for Higher Education Institutions of Gansu Province(2021B-081) the Natural Science Foundation of Gansu Province(22JR5RA074) 

主　　题：water vapor monsoon margin stable water isotope transport trajectory air mass d-excess δ18O δD 

摘      要：The isotope composition in precipitation has been widely considered as a tracer of monsoon *** with the coastal region,the monsoon margin usually has limited precipitation with large fluctuation and is usually sensitive to climate *** water resource management in the monsoon margin should be better planned by understanding the composition of precipitation isotope and its influencing *** this study,the precipitation samples were collected at five sampling sites(Baiyin City,Kongtong District,Maqu County,Wudu District,and Yinchuan City)of the monsoon margin in the northwest of China in 2022 to analyze the characteristics of stable hydrogen(δD)and oxygen(δ18O)*** analyzed the impact of meteorological factors(temperature,precipitation,and relative humidity)on the composition of precipitation isotope at daily level by regression analysis,utilized the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)-based backward trajectory model to simulate the air mass trajectory of precipitation events,and adopted the potential source contribution function(PSCF)and concentration weighted trajectory(CWT)to analyze the water vapor *** results showed that compared with the global meteoric water line(GMWL),the slope of the local meteoric water line(LMWL;δD=7.34δ^(18)O-1.16)was lower,indicating the existence of strong regional evaporation in the study *** significantly contributed toδ18O value,while relative humidity had a significant negative effect onδ18O *** the backward trajectory analysis,we found eight primary locations that were responsible for the water vapor sources of precipitation in the study area,of which moisture from the Indian Ocean to South China Sea(ITSC)and the western continental(CW)had the greatest influence on precipitation in the study *** hydrogen and oxygen isotopes in precipitation are significantly influenced by the sources and transportation paths of air *** addition,the r