Isotopic composition and hydrogeochemistry of a periglacial Andean catchment and its relevance in the knowledge of water resources in mountainous areas
Isotopic composition and hydrogeochemistry of a periglacial Andean catchment and its relevance in the knowledge of water resources in mountainous areas
复制标题
安第斯冰缘流域的同位素组成和水文地球化学及其与山区水资源知识的相关性
DOI：
10.1080/10256016.2020.1814278
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发表时间：
2020
影响因子：
1.3
通讯作者：
Darío Trombotto Liaudat
中科院分区：
文献类型：
--
作者：
Noelia R Sileo;C. Dapeña;Darío Trombotto Liaudat
摘要 冰川和冰缘盆地蕴藏着世界上最大的淡水储量。这些地区对全球变暖和气候变化极其敏感。南美洲干燥的安第斯山脉的特点是大片冰缘地区。本研究重点关注阿根廷科迪勒拉锋线 Vallecitos 流域（海拔 2400-5500 m）安第斯山脉典型冰缘环境的水同位素组成和水化学。 2013 年至 2017 年间进行了详细的现场调查，收集了 240 个样品的主要离子和理化参数，并对 67 个样品进行了 2H 和 18O 分析。降水的化学成分是典型的Ca-HCO3型，而溪流和地下水的化学成分是Ca-MgSO4型。降水同位素含量表现出广泛的分散性。一般来说，雪样本比降雨样本更贫乏。一些泉水的成分会随季节变化，这与常年积雪的融化有关。一般来说，来自上游盆地的所有样品都呈现出与高海拔补给相关的贫化同位素含量，而来自下游盆地的样品则显示出更富集的值。中间成分反映了雪的融化和富含冰的永久冻土的退化。这些结果将有助于更好地了解水的动态以管理水资源。图解摘要
ABSTRACT Glacial and periglacial basins contain the largest reserves of fresh water in the world. These areas are extremely sensitive to global warming and climate change. The dry Andes of South America are characterized by large periglacial areas. This study focuses on the water isotopic composition and hydrochemistry of a typical periglacial environment of the Andes, in the Vallecitos catchment (2400–5500 m a.s.l.), Cordillera Frontal, Argentina. Detailed fieldwork was conducted between 2013 and 2017 with 240 samples collected for major ions and physicochemical parameters, and 67 samples analysed for 2H and 18O. The chemical composition of precipitation is typical Ca-HCO3, while streams and groundwaters are Ca-MgSO4 type. The isotope content of precipitation shows a wide dispersion. The snow samples are in general more depleted than the rainfall. Some springs vary their composition seasonally, associated to the melting of perennial snow patches. In general, all samples from the upper basin present depleted isotope contents related to recharge at higher altitudes, whereas samples from the lower basin show more enriched values. Intermediate compositions reflect the melting of snow and degrading ice-rich permafrost. These results will give a better understanding of the dynamics of water to manage water resources. GRAPHICAL ABSTRACT
影响因子：
5.4
作者：
Michael T. O'Connor;M. Cardenas;B. Neilson;K. Nicholaides;G. Kling
通讯作者：
Michael T. O'Connor;M. Cardenas;B. Neilson;K. Nicholaides;G. Kling