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Hydrogeochemistry of the deglaciated lacustrine systems in Antarctica: Potential impact of marine aerosols and rock-water interactions.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2019-11-30 , DOI: 10.1016/j.scitotenv.2019.135822 N S Magesh 1 , Sathish Mohan Botsa 1 , Soniya Dessai 1 , Mamta Mestry 1 , Tara Da Lima Leitao 1 , Anoop Tiwari 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2019-11-30 , DOI: 10.1016/j.scitotenv.2019.135822 N S Magesh 1 , Sathish Mohan Botsa 1 , Soniya Dessai 1 , Mamta Mestry 1 , Tara Da Lima Leitao 1 , Anoop Tiwari 1
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The deglaciated lacustrine systems in Grovnes, Larsemann Hills, East Antarctica was assessed for its solute dynamics and hydrogeochemical interactions. These pristine high latitude lacustrine systems serve as a natural laboratory to understand the interaction between hydrosphere, lithosphere and atmosphere thus providing valuable insights on the functioning of major biogeochemical cycles. A total of 14 fresh water lakes were identified and the water samples were analysed for its physico-chemical characteristics. The abundance of anions and cations in the lake water samples were in the following order of Cl- > HCO3- > SO42- > NO3- and Na+ > Mg2+ > Ca2+ > K+ respectively. Moreover, the lakes exhibit slightly alkaline condition due to dissolution of alkaline earth metals and atmospheric fallout. Na+-Cl--HCO3- and Na+-Cl- are the commonly noticed water type in the study area and higher concentration of Na+-Cl- were due to the effect of sea spray through marine aerosols. Reverse ion exchange is noticed in most of the lakes due to saline influence. Three major mechanisms such as rock dominance, precipitation/snow and evaporation/sea spray controls the lake water geochemistry in the study area. Silicate weathering and evaporite dissolution also contribute ionic load to the lake water. Significant positive correlations (p < .01) among major ions reveal sources from bedrock weathering along with marine aerosols. Trace element chemistry shows that rock-water interaction is the primary source for dissolved metals in the lake water followed by long range atmospheric transport in the form of aeolian dust. Mineral groups such as evaporites, sulphates, carbonates, metal oxides and hydroxides are responsible for the dissolution of metal complexes in the lake water. Furthermore, lakes falling within a micro basin have shown higher Na+-Cl- content which is due to the catchment effect where snow enriched with sea spray melts during the austral summer feeding these lakes.
中文翻译：
南极冰川湖冰川系统的水文地球化学：海洋气溶胶和岩水相互作用的潜在影响。
对南极东部拉尔瑟曼山（Larsemann Hills）格罗夫尼斯（Grovnes）的冰川湖系统进行了溶质动力学和水文地球化学相互作用的评估。这些原始的高纬度湖泊系统可以作为了解水圈，岩石圈和大气之间相互作用的天然实验室，从而为重要的生物地球化学循环的功能提供有价值的见解。总共确定了14个淡水湖泊，并分析了水样的理化特性。湖水样品中阴离子和阳离子的丰度分别按以下顺序排列：Cl-> HCO3-> SO42-> NO3-，Na +> Mg2 +> Ca2 +> K +。此外，由于碱土金属的溶解和大气的沉降，这些湖泊呈现出弱碱性的状态。Na + -Cl--HCO3-和Na + -Cl-是研究区域最常见的水类型，而Na + -Cl-的较高浓度归因于通过海洋气溶胶的海喷作用。由于盐分的影响，在大多数湖泊中都发现了反向离子交换。岩石优势，降水/雪和蒸发/海浪这三种主要机制控制着研究区的湖泊水地球化学。硅酸盐的风化作用和蒸发物的溶解也增加了湖水中的离子负荷。主要离子之间的显着正相关（p <.01）揭示了来自基岩风化以及海洋气溶胶的来源。微量元素化学表明，岩水相互作用是湖水中溶解金属的主要来源，其次是风尘形式的远距离大气传输。矿物群，例如蒸发岩，硫酸盐，碳酸盐，金属氧化物和氢氧化物是金属络合物在湖水中溶解的原因。此外，落入微盆地的湖泊显示出较高的Na + -Cl-含量，这是由于集水效应所致，在南方夏季给这些湖泊供水的过程中，富含海浪的积雪融化了。
更新日期：2019-12-02
中文翻译：
南极冰川湖冰川系统的水文地球化学：海洋气溶胶和岩水相互作用的潜在影响。
对南极东部拉尔瑟曼山（Larsemann Hills）格罗夫尼斯（Grovnes）的冰川湖系统进行了溶质动力学和水文地球化学相互作用的评估。这些原始的高纬度湖泊系统可以作为了解水圈，岩石圈和大气之间相互作用的天然实验室，从而为重要的生物地球化学循环的功能提供有价值的见解。总共确定了14个淡水湖泊，并分析了水样的理化特性。湖水样品中阴离子和阳离子的丰度分别按以下顺序排列：Cl-> HCO3-> SO42-> NO3-，Na +> Mg2 +> Ca2 +> K +。此外，由于碱土金属的溶解和大气的沉降，这些湖泊呈现出弱碱性的状态。Na + -Cl--HCO3-和Na + -Cl-是研究区域最常见的水类型，而Na + -Cl-的较高浓度归因于通过海洋气溶胶的海喷作用。由于盐分的影响，在大多数湖泊中都发现了反向离子交换。岩石优势，降水/雪和蒸发/海浪这三种主要机制控制着研究区的湖泊水地球化学。硅酸盐的风化作用和蒸发物的溶解也增加了湖水中的离子负荷。主要离子之间的显着正相关（p <.01）揭示了来自基岩风化以及海洋气溶胶的来源。微量元素化学表明，岩水相互作用是湖水中溶解金属的主要来源，其次是风尘形式的远距离大气传输。矿物群，例如蒸发岩，硫酸盐，碳酸盐，金属氧化物和氢氧化物是金属络合物在湖水中溶解的原因。此外，落入微盆地的湖泊显示出较高的Na + -Cl-含量，这是由于集水效应所致，在南方夏季给这些湖泊供水的过程中，富含海浪的积雪融化了。
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