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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Origin and temporal variability of unusually low δ~(13)C-DOC values in two High Arctic catchments
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Origin and temporal variability of unusually low δ~(13)C-DOC values in two High Arctic catchments

机译：两个高北极集水区异常低的δ〜（13）C-DOC值的成因和时间变化

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The stable carbon isotopic composition of dissolved organic matter (δ~(13)C-DOC) reveals information about its source and extent of biological processing. Here we report the lowest δ~(13)C-DOC values (?43.8‰) measured to date in surface waters. The streams were located in the High Arctic, a region currently experiencing rapid changes in climate and carbon cycling. Based on the widespread occurrence of methane cycling in permafrost regions and the detection of the pmoA gene, a proxy for aerobic methanotrophs, we conclude that the low δ~(13)C-DOC values are due to organic matter partially derived from methanotrophs consuming biologically produced, ~(13)C-depleted methane. These findings demonstrate the significant impact that biological activity has on the stream water chemistry exported from permafrost and glaciated environments in the Arctic. Given that the catchments studied here are representative of larger areas of the Arctic, occurrences of low δ~(13)C-DOC values may be more widespread than previously recognized, with implications for understanding C cycling in these environments.
机译：溶解有机物（δ〜（13）C-DOC）的稳定碳同位素组成揭示了有关其来源和生物加工范围的信息。在这里，我们报告了迄今为止在地表水中测得的最低δ〜（13）C-DOC值（？43.8‰）。这些溪流位于北极地区，该地区目前气候和碳循环迅速变化。根据多年冻土地区甲烷循环的广泛发生和有氧甲烷营养生物的代用品pmoA基因的检测，我们得出结论，较低的δ〜（13）C-DOC值是由于部分生物消耗甲烷生物而获得的有机物产生〜（13）C贫化的甲烷。这些发现证明了生物活性对北极多年冻土和冰川环境出口的溪流水化学具有重大影响。鉴于此处研究的流域代表了北极的较大区域，因此低δ〜（13）C-DOC值的发生可能比以前认识的更为广泛，这对于理解这些环境中的C循环具有启示意义。

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