中文关键词降水氢氧同位素过量氘大气降水线水汽源地局地蒸发 英文关键词precipitationhydrogen and oxygen stable isotopic compositionsdeuterium-excesslocal meteoric water linewater vapor sourcelocal evaporation

作者	单位	E-mail
胡勇博	南京信息工程大学大气环境中心, 南京 210044	971414065@qq.com
肖薇	南京信息工程大学大气环境中心, 南京 210044 南京信息工程大学江苏省大气环境与装备技术协同创新中心, 南京 210044	wei.xiao@nuist.edu.cn
钱雨妃	南京信息工程大学大气环境中心, 南京 210044
刘强	南京信息工程大学大气环境中心, 南京 210044
谢成玉	南京信息工程大学大气环境中心, 南京 210044
张秀芳	南京信息工程大学大气环境中心, 南京 210044
张文庆	南京信息工程大学大气环境中心, 南京 210044
温学发	中国科学院地理科学与资源研究生态系统网络观测与模拟重点实验室, 北京 100101
刘寿东	南京信息工程大学大气环境中心, 南京 210044 南京信息工程大学江苏省大气环境与装备技术协同创新中心, 南京 210044
李旭辉	南京信息工程大学大气环境中心, 南京 210044

中文摘要 降水氢氧稳定同位素组分是一种良好的示踪剂，对水汽循环的研究有重要意义.本研究基于2016年在南京、溧阳、宜兴和东山这4个站点按降水事件采集的降水样品，测定了降水HDO和H₂¹⁸O组分，分析了降水HDO、H₂¹⁸O组分以及过量氘的时间变化特征；探讨了水汽源地和局地蒸发对降水稳定同位素组分的影响.结果表明：①冬夏季风期间水汽源地的差异使4个站点降水HDO、H₂¹⁸O组分及过量氘有明显的季节变化，主要表现为HDO和H₂¹⁸O组分夏季风期间贫化，冬季风期间富集；过量氘夏季风期间小于冬季风期间；②夏季风期间，太湖蒸发补给使下游地区的降水过量氘变大，局地大气降水线方程的截距变高；冬季风期间，局地蒸发对降水同位素影响很小，降水HDO、H₂¹⁸O组分以及过量氘的空间变化不明显；③ 4个站点局地大气降水线方程的斜率和截距均较高，原因可能是冬夏季风期间的降水水汽来源的差异和冬季风期间水汽再循环过程的影响. 英文摘要 Stable hydrogen and oxygen isotopic compositions in precipitation are good tracers and can provide unique information about the water cycle. Precipitation samples were collected at the Nanjing, Liyang, Yixing, and Dongshan sites in 2016, and the HDO and H₂¹⁸O compositions of precipitation were measured. The temporal variability of HDO and H₂¹⁸O compositions and deuterium-excess of precipitation were analyzed, and the influence of the water vapor source and local evaporation on stable isotopic composition of precipitation were discussed. The results indicated that:① Seasonal variations in the HDO composition, H₂¹⁸O composition, and deuterium-excess of precipitation occurred due to different water vapor sources during the summer and winter monsoon seasons. The HDO and H₂¹⁸O compositions were depleted during the summer monsoon season and enriched during the winter monsoon season. The deuterium-excess during the summer monsoon season was lower compared to the winter monsoon season. ② During the summer monsoon, the evaporation of Lake Taihu made the deuterium-excess of downwind precipitation and the downwind intercept of the local meteoric water line higher. During the winter monsoon season, local evaporation had little influence on HDO and H₂¹⁸O components in precipitation. ③ Both of the intercepts and slopes of the local meteoric water line were higher than those of the global meteoric water line, due to moisture recycling during the winter monsoon season and different water vapor sources between the summer and winter monsoon seasons.

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