江苏高邮大气降水氢氧同位素特征及水汽来源

doi:10.13287/j.1001-9332.201906.009

摘要/Abstract

摘要： 为了研究江苏高邮局地水循环特征,应对气候变化和减缓洪涝灾害.本研究采集江苏高邮自2015年7月—2017年10月的121个大气降水样品及环境因子数据,分析该区大气降水氢氧同位素特征,揭示不同季节水汽来源及影响因素.结果表明: 大气降水δD(δ¹⁸O)季节变化明显,冬半年偏正,夏半年偏负;过量氘值亦呈现冬高夏低;年尺度上,大气降水中δD(δ¹⁸O)与温度和降水量皆为负相关关系,呈现“反温度效应”和“降水量效应”;季节尺度上,均未呈现出“温度效应”,秋冬两季呈现出“降水量效应”;HYSPLIT气团轨迹模型结果进一步表明,江苏高邮夏季水汽主要来源于我国南海、印度洋及太平洋,而春、秋、冬季水汽主要来源于亚欧大陆、大西洋、北冰洋水汽混合及局地蒸发.大气降水δD(δ¹⁸O)值的季节变化主要受到季风活动以及厄尔尼诺-南方涛动(ENSO)的影响,降水中氢氧同位素值清晰地记录了厄尔尼诺向拉尼拉之间的过渡.

Abstract: It is necessary to examine the characteristics of hydrological cycle in Gaoyou area of Jiang-su Province in response to climate change and flood disasters. In this study, 121 atmospheric rain samples were collected and environmental factors were recorded from July 2015 to October 2017. We analyzed the hydrogen and oxygen stable isotopic composition of rain and identify moisture sources in this area. Results showed that the hydrogen and oxygen isotopic composition of rain had an seasonal variation, which was positive in the winter but negative in the summer. D-excess value was higher in winter than that in summer. On the annual scale, significantly negative relationships between δD (δ¹⁸O) and temperature and between δD (δ¹⁸O) and precipitation indicated the “anti-temperature effect” and “precipitation amount effect”, respectively. On the seasonal scale, there was no obvious “temperature effect” but “precipitation amount effect” in autumn and winter. Results from the HYSPLIT model showed that the precipitation in this area came mainly from ocean evaporation that was influenced by the Chinese South Sea, Indian Ocean and Pacific Ocean. Precipi-tation in other seasons mainly came from the water vapor mixture from the Eurasian continent, Atlantic Ocean, Arctic Ocean, as well as local evaporation. The seasonal pattern of δD and δ¹⁸O values in precipitation was mainly influenced by monsoon activity and El Niño-Southern Oscillation (ENSO). In addition, the precipitation isotopes clearly indicated the shift in climates from El Niño to La Niña.

隋明浈, 高德强, 徐庆, 何冬梅, 王磊, 王婷. 江苏高邮大气降水氢氧同位素特征及水汽来源[J]. 应用生态学报, 2019, 30(6): 1823-1832.

SUI Ming-zhen, GAO De-qiang, XU Qing, HE Dong-mei, WANG Lei, WANG Ting. Characteristics of hydrogen and oxygen isotopes in precipitation and moisture sources in Gaoyou, Jiangsu Province, China[J]. Chinese Journal of Applied Ecology, 2019, 30(6): 1823-1832.

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