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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A centennial record of fluvial organic matter input from the discontinuous permafrost catchment of Lake Tornetrsk
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A centennial record of fluvial organic matter input from the discontinuous permafrost catchment of Lake Tornetrsk

机译：Tornetrsk湖不连续冻土集水区河流有机物输入的百年记录

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摘要

High-latitude regions are underlain by the most organic carbon (OC)-rich soils on earth and currently subject to intense climate warming, potentially increasing remobilization and mineralization of soil OC. Sub-Arctic Scandinavia is located on the 0C mean annual isotherm and is therefore particularly vulnerable to climate change. This study aimed to establish a baseline for soil OC release over the past century into Lake Tornetrsk, the largest lake in sub-Arctic Scandinavia, through bulk geochemical and molecular radiocarbon analyses in chronologically constrained sediment cores. Our results suggest a dominance of peat-derived terrestrial OC inflow. We show that the annual terrestrial OC inflow to the lake is ～12 times higher than the in-lake produced particulate OC, and consists for a large part (ca. 60%) of old OC from deep reservoirs in the catchment. The sedimentary record shows signs of increasing inflow of more degraded terrestrial matter since ～1975, as indicated by increasing %TOC concentrations, a lower δ ~(13)C value and lower TOC:TN ratios. Based on simultaneous changes in local climate and reported signs of permafrost degradation (e.g., active layer deepening, mire/peat erosion), the observed changes in the sedimentary record of Scandinavia's largest mountain lake likely reflect a climate warming-induced change in terrestrial OC inflow.
机译：高纬度地区是地球上有机碳含量最高的土壤，目前正遭受强烈的气候变暖，这可能会增加土壤OC的迁移和矿化作用。亚北极斯堪的纳维亚半岛的年均等温线为0C，因此特别容易受到气候变化的影响。这项研究的目的是通过按时间顺序限制沉积物核的大量地球化学和分子放射性碳分析，为过去一个世纪进入北斯堪的纳维亚半岛最大的湖泊Tornetrsk湖中的土壤OC释放建立基准。我们的结果表明，泥炭来源的陆地OC流入占主导地位。我们表明，每年向湖中流入的陆地OC比湖中产生的颗粒状OC高约12倍，并且大部分（约60％）来自流域深水库的旧OC。沉积记录表明，自1975年以来，降解程度更大的陆地物质流入的迹象有所增加，这表现为％TOC浓度增加，δ〜（13）C值降低和TOC：TN比降低。根据当地气候的同时变化和所报告的多年冻土退化迹象（例如，活跃层加深，泥潭/泥石流侵蚀），斯堪的纳维亚最大的高山湖泊的沉积记录中观察到的变化可能反映了气候变暖引起的陆地OC流入量的变化。 。

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