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

作　　者：张婷 黄领梅[1] 孔晓乐 裴宏伟[3] 马全伟 沈彦军[2] ZHANG Ting;HUANG Lingmei;KONG Xiaole;PEI Hongwei;MA Quanwei;SHEN Yanjun(Department of Municipal and Environmental Engineering,School of Water Resources and Hydropower,Xi’an University of Technology,Xi’an 710048,China;Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences/Hebei Key Laboratory of Agricultural Water-Saving,Shijiazhuang 050022,China;Hebei University of Architecture,Zhangjiakou 075000,China;Zhangjiakou Agricultural Technology Extension Station,Zhangjiakou 075032,China)

机构地区：[1]西安理工大学水利水电学院市政与环境工程系,西安710048 [2]中国科学院遗传与发育生物学研究所农业资源研究中心/河北省节水农业重点实验室,石家庄050022 [3]河北建筑工程学院,张家口075000 [4]张家口市农业技术推广站,张家口075032

出　　处：《中国生态农业学报(中英文)》2025年第4期759-768,共10页Chinese Journal of Eco-Agriculture

基　　金：河北省重点研发计划项目(22377001D);河北省自然科学基金项目(D2022503001)资助。

摘　　要：冀西北地区地处我国北方干旱湿润过渡带,生态系统对降水的敏感性极强,明确降水的时空分布规律及其来源可为区域农业发展及水资源高效利用提供科技支撑,然而目前对其大气降水中氢氧稳定同位素的认识仍十分有限。本研究采用数理统计法和同位素示踪法,对冀西北地区张家口市桥东区、张北县和康保县3个站点开展降水同位素观测,分析其时空分布规律及其环境效应,并通过后向轨迹追踪法定量分析了本地区的水汽来源。结果表明:冀西北降水δ^(2)H和δ^(18)O同位素具有明显的季节变化特征,夏季富集、冬季贫化,δ^(2)H和δ^(18)O的最大值和最小值分别出现在桥东区的6月(-38.7‰和-5.7‰)和张北县的1月(-164.8‰和-21.2‰)。降水中稳定同位素温度效应和纬度效应显著,但不存在雨量效应。区域大气降水线为δ^(2)H=7.957δ^(18)O+7.226 (R^(2)=0.962)。水汽输送轨迹显示,夏季降水水汽主要受东亚季风环流影响,东亚季风带来的水汽分别占桥东区、张北县和康保县3个站点夏季降水总量的53.53%、55.43%和52.17%;其他季节主要受西风带水汽以及蒙古大陆性气团控制,水汽占比之和达70%以上。本文结果对于增进区域水循环的认识及水资源的合理优化配置具有重要意义。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 δ^(2)H and δ^(18)O 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 δ^(2)H and δ^(18)O 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 δ^(2)H and δ^(18)O were recorded in June and January, respectively. For δ^(2)H and δ^(18)O, 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 δ^(2)H = 7.957δ^(18)O + 7.226 (R^(2) = 0.962). The slope was closed to and the inter-cept was lower tha

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 

分 类 号：P467[天文地球—大气科学及气象学]