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Abstract：
Metal contamination has become an increasingly severe environmental issue due to intense anthropogenic activities in recent decades. Many studies have reported a rapidly increasing trend of heavy metal contents in sedimentary records. In this study, two lacustrine sediment cores (LDL and YL) far away from scientific research stations were collected in Ny-Ålesund and analyzed for the vertical distributions of 17 elemental concentrations (Cu, Zn, Pb, Co, Ni, Cr, Sr, Ba, Mn, P, Ti, K2O, Na2O, CaO, MgO, Fe2O3, Al2O3), CIA and TOC contents. The results indicated that only the proxies Pb, P, CaO, TOC, and CIA showed an increasing trend in the upper 7 cm section of the sediment cores, while most of the elements\' concentrations decreased towards the surface. The rapid increase of TOC contents is likely related to the climate warming over the past 200 years, which promotes the prosperity of vegetation and thus leads to more input of organic matter into the lakes. Moreover, a large number of seabirds live around the sampling position and the seabird guano contains high concentrations of P, which could be regarded as an important nutrient source for vegetation. Additionally, the rapid climate warming could accelerate the chemical weathering rates, and thus lead to increased CaO contents in the sediment profiles according to its geological background. Therefore, the concentrations of other elements are very likely diluted by the high contents of organic matter and CaO in the upper part of the sediment cores. It is noteworthy that the rapidly increasing trend of Pb contents are related to the gas-oil powered generators in Ny-Ålesund and long-range atmospheric transport from Europe. This study highlighted the nonnegligible influence of climate warming on the inorganic elemental geochemistry distributions in remote lakes.
摘要：
近几十年来，由于强烈的人为活动，金属污染已成为一个日益严峻的环境问题。许多研究报告了沉积记录中重金属含量的快速增长趋势。在这项研究中,在尼奥勒松收集了两个远离科学研究站的湖相沉积物核心（LDL和YL），并分析了17种元素浓度的垂直分布（Cu，Zn,Pb,Co,Ni,Cr,Sr,Ba,Mn,P,Ti,K2O,Na2O,CaO,MgO,Fe2O3,Al2O3),CIA和TOC内容。结果表明，只有铅的代理，P,CaO,TOC,和CIA在沉积物岩心的上7cm部分显示出增加的趋势，而大多数元素的浓度朝向表面下降。TOC含量的快速增加可能与过去200年的气候变暖有关，这促进了植被的繁荣，从而导致更多的有机物进入湖泊。此外，大量海鸟生活在采样位置周围，海鸟鸟粪中含有高浓度的P，可视为植被的重要营养来源。此外,快速的气候变暖可能加速化学风化速率，因此，根据其地质背景，导致沉积物剖面中CaO含量增加。因此,其他元素的浓度很可能被沉积物核心上部高含量的有机物和CaO稀释。值得注意的是，Pb含量的快速增长趋势与Ny-奥勒松的天然气油动力发电机以及欧洲的远距离大气运输有关。这项研究强调了气候变暖对偏远湖泊无机元素地球化学分布的不可忽视的影响。
