| 湖水氢氧同位素组分的时间变化特征及影响因子分析 |
| 摘要点击 3897 全文点击 1687 投稿时间：2015-10-29 修订日期：2016-01-27 |
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| 中文关键词 湖泊 HDO H218O 时间变化特征 控制因子 |
| 英文关键词 lake HDO H218O temporal variability controlling factors |
| 作者 | 单位 | E-mail | | 徐敬争 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044 | xjz1015@163.com | | 肖薇 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | wei.xiao@nuist.edu.cn | | 肖启涛 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044 | | | 王伟 | 南京信息工程大学Yale-NUIST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所生态系统网络观测与模拟重点实验室, 北京 100101 | | | 胡诚 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044 | | | 刘诚 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044 | | | 刘寿东 | 南京信息工程大学Yale-NUIST大气环境中心, 南京 210044
南京信息工程大学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Yale-NUIST大气环境中心, 南京 210044 | |
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| 中文摘要 |
| 湖水氢氧稳定同位素组分对于水文学、气象学和古气候学研究都有重要的意义.本研究在太湖对湖水HDO和H218O组分(δDL和δ18OL)开展了长期连续地观测,计算了过量氘(dL),分析了它们的时间变化规律,并研究其主要控制因素.结果表明:①湖水氢氧同位素组分存在明显的时间变化,δDL的变化范围-59.8‰~-24.2‰,δ18OL的变化范围-8.6‰~-2.6‰,dL的变化范围为-7.9‰~12.9‰;暖季δDL和δ18OL较高,dL较低;冷季反之.②在月尺度上,湖水蒸发量及其占湖泊入水量的比重是湖水氢氧稳定同位素富集的主要控制因素,湖水蒸发量或者蒸发量占湖泊入湖水量比重增加,δDL和δ18OL升高,dL降低.③对于太湖而言,降水氢氧稳定同位素组分和水温并非湖水稳定同位素变化的控制因素.本文的研究结果可以为稳定同位素水文学研究以及与湖水稳定同位素富集相关的气象学和古气候学研究提供科学参考. |
| 英文摘要 |
| The composition of hydrogen and oxygen stable isotopes in lake water is important to the researches in hydrology, meteorology and paleoclimatology. In this study, long-term and continuous measurement on the compositions of HDO and H218O in lake water (δDL and δ18OL) was conducted over Lake Taihu, the deuterium excess (dL) was calculated, and the temporal variability and controlling factors were analyzed. The results indicated that ① the variation of isotopic enrichment in lake water was significant, ranging from -59.8‰ to -24.2‰ for δDL, from -8.6‰ to -2.6‰ for δ18OL, and from -7.9‰ to 12.9‰ for dL, respectively. In comparison to cold season, δDL and δ18OL were higher and dL was lower during warm season. ② On monthly time-scale, lake evaporation and the ratio of total water inputs lost by evaporation controlled the isotopic enrichment in lake water. When lake evaporation or the ratio increased, δDL and δ18OL increased, but dL decreased. ③ Over Lake Taihu, the isotopic composition in precipitation and water temperature did not control the isotopic enrichment. The results provide scientific reference for isotope hydrology and the researches related to the isotopic enrichment in lake water in meteorology and paleoclimate. |
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