中国生态农业学报（中英文）2025，Vol.33Issue(4)：759-768,10.DOI:10.12357/cjea.20240563
冀西北降水同位素特征及其水汽来源分析
Isotopic characteristics of precipitation and its water vapor sources in Northwest Hebei Province
摘要
Abstract
Northwest Hebei Province is located in the arid-humid transition zone in northern China,where the ecosystem is highly sensitive to precipitation.Clarifying the spatial and temporal distribution patterns of precipitation and its sources can provide scientific and technological support for regional agricultural development and the efficient utilization of water resources.However,at present,the understanding of the stable isotopes of hydrogen and oxygen in precipitation is still very limited.In this study,based on precipita-tion isotope observation data from three stations located at Qiaodong,Zhangbei,and Kangbao in Zhangjiakou City,Northwest Hebei Province,we analyzed the spatial and temporal distribution patterns of δ2H and δ18O isotopes and deuterium surplus(D-excess)in pre-cipitation and their environmental effects using mathematical and statistical methods.Moreover,the water vapor sources in this region were quantitatively analyzed using the backward trajectory tracking method based on the MeteoInfo software.Results revealed that the δ2H and δ18O isotopes in precipitation in Northwest Hebei Province were characterized by obvious seasonal varia-tions,exhibiting enrichment in summer and depletion in winter.The highest and lowest values of both δ2H and δ18O were recorded in June and January,respectively.For δ2H and δ18O,the highest values were-38.7‰ and-5.7‰,and the lowest values were-164.8‰and-21.2‰,respectively.Moreover,the isotopes in precipitation had clear effects of temperature and latitude,but no significant pre-cipitation effect.Spatially,isotope values were depleted albeit with increased latitude,following the order of Qiaodong＞Zhangbei＞Kangbao.The sensitivity of precipitation isotopes to temperature increased with increasing latitude,indicating a significant tempera-ture effect.The local meteoric water line(LMWL)was δ2H=7.957δ18O+7.226(R2=0.962).The slope was closed to and the inter-cept was lower than those of the global meteoric water line,indicating a nonobvious characteristic of water vapor evaporation.The in-tercepts increased progressively from Qiaodong(4.884)to Zhangbei(7.842)and Kangbao(8.205).The results of the backward tra-jectory analysis showed that the sources of water vapor at the three stations in Northwest Hebei Province exhibited similarities.Dur-ing summer,water vapor from precipitation was influenced mainly by the East Asian monsoon circulation,with the vapor contribu-tion rates at Qiaodong,Zhangbei,and Kangbao being 53.53％,55.43％,and 52.17％,respectively.In other seasons,water vapor was controlled predominantly by the westerly wind belt and Mongolian continental air masses,with their combined contribution excee-ding 70％of the total.Notable variations occurred in the transport pathway of water vapor:in spring,water vapor was derived prima-rily from northern and western pathways,although the water vapor in Qiaodong was affected also by southerly flows from the wes-tern Pacific Ocean and the South China Sea,accounting for 25.27％of the total;in autumn and winter,water vapor originated pre-dominantly from western pathways,while being controlled by a single westerly air mass,with proportions exceeding 90％of the total.Overall,this study contributes to an in-depth understanding of regional water vapor cycling processes.关键词
降水/同位素/水汽来源/后向轨迹追踪模型/冀西北地区Key words
precipitation/isotopes/source of water vapor/backward trajectory tracking model/Northwest Hebei Province分类
天文与地球科学引用本文复制引用
张婷,黄领梅,孔晓乐,裴宏伟,马全伟,沈彦军..冀西北降水同位素特征及其水汽来源分析[J].中国生态农业学报（中英文）,2025,33(4):759-768,10.基金项目
河北省重点研发计划项目(22377001D)和河北省自然科学基金项目(D2022503001)资助 This study was supported by the Key Research and Development Program of Hebei Province(22377001D)and the Natural Science Foundation of Hebei Province(D2022503001). （22377001D）
