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首页> 外文期刊>Geosciences >Geochemical Processes Controlling Ionic Composition of Water in the Catchments of Lakes Saana and Saanalampi in the Kilpisj?rvi Area of North Scandinavia
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Geochemical Processes Controlling Ionic Composition of Water in the Catchments of Lakes Saana and Saanalampi in the Kilpisj?rvi Area of North Scandinavia

机译：控制北斯堪的纳维亚州基尔皮什维地区的萨阿纳湖和萨阿纳兰皮湖流域水离子组成的地球化学过程

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The study focuses on chemical composition of stream and subsurface water in the catchments of two small arctic alpine lakes in the Kilpisj?rvi area (northwest Finland). Differences and changes in chemical components of both water types are followed in order to detect spatial variability and impact of environmental factors. To achieve this, ion compositions of subsurface water and streams were measured at 12 sites in the catchments of Lakes Saana and Saanalampi during four years (2008–2010, and again in 2017). In the Lake Saanalampi catchment, the salinity of stream water (7.0 to 12.7 μS·cm ?1 ) corresponded to that of snow. In the catchment of Lake Saana, however, the conductivity in stream water was much higher (40 to 220 μS·cm ?1 ), connected mainly to the increase of SO 4 2 ? and less with Mg 2+ and Ca 2+ contents, especially in the western part of the Saana catchment. These results demonstrate that arctic conditions do not preclude intense chemical weathering where conditions are favourable. Although chemical composition of the soil fluid does not match the geochemical signal from the local soil, rock composition, especially the presence of pyrite, is the main controller of chemical weathering rates of the rocks on the area. This supports earlier views that the character of precipitation mostly controls water chemistry of local lakes in the Kilpisj?rvi area.
机译：这项研究的重点是基尔皮瑟维地区（西北芬兰）的两个小型北极高山湖泊流域的河流和地下水的化学成分。为了检测空间变异性和环境因素的影响，两种水的化学成分之间都存在差异和变化。为了实现这一目标，在四年中（2008年至2010年，以及2017年），在萨阿纳湖和萨阿纳兰皮湖流域的12个站点测量了地下水和河流的离子组成。在萨阿纳兰皮湖流域，溪流水的盐度（7.0至12.7μS·cm？1）对应于雪。然而，在萨阿纳湖流域，溪流水中的电导率要高得多（40至220μS·cm？1），主要与SO 4 2？的增加有关。 Mg 2+和Ca 2+含量较少，尤其是在萨阿那流域的西部。这些结果表明，在有利的条件下，北极条件不会排除强烈的化学风化。尽管土壤流体的化学成分与当地土壤的地球化学信号不匹配，但岩石成分，尤其是黄铁矿的存在，是该地区岩石化学风化率的主要控制者。这支持了先前的观点，即降水的特征主要控制了基尔皮什维地区的局部湖泊的水化学。

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