Study on Hydrological Processes in Lena River Basin using Stable Isotope Ratios of River Water
Study on Hydrological Processes in Lena River Basin using Stable Isotope Ratios of River Water
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发表时间：
2012-03
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通讯作者：
A. Sugimoto;T. Maximov
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作者：
A. Sugimoto;T. Maximov
在雅库茨克对勒拿河水进行了采样，并观察了其同位素比值。河水的同位素组成表现出明显的季节性，与脉冲的低{delta}值，由于径流的雪融水，并在夏季增加{delta}值，这可能是由一个衰退的雪融水和径流来自夏季降水更积极的{delta}值。河水的同位素比值略有下降，在冻结期，当有低流量。随着地面的冻结过程从表面向下进行，产生径流的土壤层可能会变得更深。这可能导致在冬季观察到的{delta}值逐渐减小。据指出，冬季流量在西伯利亚东部呈增加趋势。在多年冻土覆盖区，增加的趋势最为明显。监测河水的同位素比值可以提高我们对冬季流量增加的来源和过程的理解。（作者）
Lena river water was sampled at Yakutsk and its isotope ratios were observed. The isotopic composition of river water showed a clear seasonality, with a pulse of low {delta} values due to runoff of snow meltwater, and following an increase in {delta}values during summer, which may be caused by a recession of snow meltwater and runoff originating from summer precipitation with more positive {delta} values. The isotope ratios of river water slightly decreased again during the freezing period, when there was low discharge. As the freezing process of the ground progresses from the surface down, the soil layers producing runoff may become deeper. This may cause the gradual decrease in {delta} values observed in winter. It has been pointed out that winter discharge showed an increasing trend in eastern Siberia. An increasing trend is most obvious in the area covered by permafrost. Monitoring of isotope ratios of river water may improve our understanding of the source and process of increasing winter discharge. (author)