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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H_2~(18)O组分(δDL和δ~(18)OL)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‰,δ~(18)OL的变化范围-8.6‰~-2.6‰,dL的变化范围为-7.9‰~12.9‰;暖季δDL和δ~(18)OL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δ~(18)OL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.
Hydrogen-oxygen stable isotope composition of lake water is of great significance to hydrology, meteorology and paleoclimate research.In this study, the effects of lake water on HDO and H 2 O 18 O (δDL and δ ~ (18) O) The long-term continuous observation and calculation of excess deuterium (dL) were carried out, and the regularities of their time variation were analyzed and the main controlling factors were studied. The results showed that there was a significant temporal change in the hydrogen and oxygen isotopic composition of lake water, -59.8 ‰ to -24.2 ‰, the δ ~ (18) OL ranged from -8.6 ‰ to -2.6 ‰, and the dL ranged from -7.9 ‰ to 12.9 ‰. The δDL and δ ~ (18) OL in warm season were higher, dL is low; on the contrary, in the cold season.2 On the monthly scale, the proportion of lake water evaporation and its contribution to lake water input is the main controlling factor of hydrogen-oxygen stable isotope enrichment in the lake. The evaporation or evaporation of lake water accounts for the proportion of lake water into the lake ΔDL and δ ~ (18) OL increased, and dL decreased.3 For the Taihu Lake, the stable isotope composition and water temperature of precipitation are not the controlling factors for the stable isotope variation of the lake water.The results of this paper can be stable isotope hydrology Research and Meteorology and Paleoclimate Studies Related to Stable Lake Isotope Enrichment Reference.