中山大学学报(自然科学版) ›› 2020, Vol. 59 ›› Issue (1): 86-95.doi: 10.13471/j.cnki.acta.snus.2020.01.011

• • 上一篇    下一篇

东江下游大气降水氢氧同位素特征及水汽来源

谢林环1,江涛1,曹英杰2,3,黎坤1,唐常源1,2,3   

  1. 1.中山大学地理科学与规划学院,广东 广州 510275;
    2.中山大学环境科学与工程学院,广东 广州 510275;
    3.广东省环境污染控制与修复技术重点实验室, 广东 广州 510275
  • 收稿日期:2018-07-20 出版日期:2020-01-25 发布日期:2020-02-28
  • 通讯作者: 江涛(1965年生),女;研究方向:水文与水环境;E-mail:eesjt@mail.sysu.edu.cn

The hydrogen and oxygen isotope characteristics of precipitation and water vapor sources in the lower Dongjiang River reaches, Guangdong Province

XIE Linhuan1, JIANG Tao1, CAO Yingjie2,3, LI Kun1, TANG Changyuan1,2,3#br#   

  1. 1.School of Geography and Planning, Sun Yatsen University, Guangzhou 510275, China; 
    2.School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; 
    3.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Guangzhou 510275, China)

  • Received:2018-07-20 Online:2020-01-25 Published:2020-02-28

摘要: 大气降水是水循环系统的主要输入源,其氢、氧稳定同位素组成(δD、δ18O)受区域气象、地理等因素变化影响较大,可以对环境变化做出快速、及时的响应,是研究全球和局地水循环特征的重要技术手段。东江流域地处我国珠江三角洲,季风环流通过影响水汽输送场的分布控制降水的时空分配。为研究区域降水成因及机理,本文采集并测定东江流域下游地区2017年逐日降水样品中δD、δ18O,以月为研究时间尺度,分析其与气温、降水量之间的关系;利用HYSPLIT后向轨迹模式追踪降水气团的传输路径,进一步探讨区域降水的水汽来源及输送状况。结果表明,研究期间降水样品中δD的变化范围为-105.10‰~+9.98‰,雨量加权平均值为-57.88‰;δ18O的变化范围为-14.80‰~-0.55‰,雨量加权平均值为-8.61‰,局地大气降水线为δD=8.60δ18O+16.15(R2=0.99)。月尺度下δ18O最高值出现在1月份,为-3.47‰,最低值出现在8月份,为-10.17‰。δ18O与气温、降水量均呈显著负相关关系,表现“反温度效应”和“降水量效应”。太平洋水汽带来的降水δ18O、δD偏高,印度洋水汽带来的降水δ18O、δD偏低,而南海降水气团中δ18O、δD则随季节的不同而改变,表现为夏、秋两季明显较春季贫化,存在明显“降水同位素环流效应”。


关键词: 氢氧同位素, 大气降水, 水汽来源, HYSPLIT, 东江

Abstract: Atmospheric precipitation is the main input source of the water cycle system, and the stable isotope compositions (δD, δ18O) are greatly influenced by regional meteorological and geographical factors and are very sensitive to environmental changes. Stable oxygen and hydrogen isotope technique is widely used to study the characteristics of the global and local water circulation. The Dongjiang River Basin is located in the Pearl River Delta, China. The monsoon circulation controls the time and space distributions of precipitation by affecting the distribution of water vapor transport field. The lower reaches of the Dongjiang River was taken as the research object to study the mechanism of regional precipitation. Daily precipitation samples were collected in 2017, δD and δ18O were measured and the relationships between δD, δ18O and temperature, precipitation were analyzed. The HYSPLIT backward trajectory model was used to trace water vapor sources and the transport of regional precipitation. The results show that the δD and δ18O values ranged from -105.10‰ to +9.98‰ and -14.80‰ to -0.55‰, respectively, and the annual weighted mean values were -57.88‰ and -8.61‰. Regional Meteoric Water Line was δD=8.60δ18O+16.51(R2=0.99). The maximum δ18O appeared in January, which was -3.47‰, and the minimum value appeared in August, which was -10.17‰. In the monthly scale, δ18O shows “anti-temperature effect” and “quantity effect” The δD and δ18O in precipitation which caused by water vapor in the Pacific Ocean were higher than those in the Indian Ocean. However, the δD and δ18O in precipitation caused by the air masses from the South China Sea changed with the seasons, which weres significantly lower in summer and autumn than those in spring. There was obvious circulation effect of isotope in atmospheric precipitation. 


Key words: hydrogen and oxygen isotopes, atmospheric precipitation, water vapor source, HYSPLIT, Dongjiang River

中图分类号: