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首页> 外文期刊>Global Biogeochemical Cycles >Release of Black Carbon From Thawing Permafrost Estimated by Sequestration Fluxes in the East Siberian Arctic Shelf Recipient
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Release of Black Carbon From Thawing Permafrost Estimated by Sequestration Fluxes in the East Siberian Arctic Shelf Recipient

机译：通过在东西伯利亚北极货架接收方中解冻永久冻土的解冻永久冻结的黑碳

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摘要

Black carbon (BC) plays an important role in carbon burial in marine sediments globally. Yet the sequestration of BC in the Arctic Ocean is poorly understood. Here we assess the concentrations, fluxes, and sources of soot BC (SBC)-the most refractory component of BC-in sediments from the East Siberian Arctic Shelf (ESAS), the World's largest shelf sea system. SBC concentrations in the contemporary shelf sediments range from 0.1 to 2.1 mg g(-1) dw, corresponding to 2-12% of total organic carbon. The Pb-210-derived fluxes of SBC (0.42-11 g m(-2) yr(-1)) are higher or in the same range as fluxes reported for marine surface sediments closer to anthropogenic emissions. The total burial flux of SBC in the ESAS (similar to 4,000 Gg yr(-1)) illustrates the great importance of this Arctic shelf in marine sequestration of SBC. The radiocarbon signal of the SBC shows more depleted yet also more uniform signatures (-721 to -896%; average of -774 +/- 62%) than of the non-SBC pool (-304 to -728%; average of -491 +/- 163%), suggesting that SBC is coming from an, on average, 5,900 +/- 300 years older and more specific source than the non-SBC pool. We estimate that the atmospheric BC input to the ESAS is negligible (similar to 0.6% of the SBC burial flux). Statistical source apportionment modeling suggests that the ESAS sedimentary SBC is remobilized by thawing of two permafrost carbon (PF/C) systems: surface soil permafrost (topsoil/PF; 25 +/- 8%) and Pleistocene ice complex deposits (ICD/PF; 75 +/- 8%). The SBC contribution to the total mobilized permafrost carbon (PF/C) increases with increasing distance from the coast (from 5 to 14%), indicating that the SBC is more recalcitrant than other forms of translocated PF/C. These results elucidate for the first time the key role of permafrost thaw in the transport of SBC to the Arctic Ocean. With ongoing global warming, these findings have implications for the biogeochemical carbon cycle, increasing the size of this refractory carbon p
机译：黑碳（BC）在全球海洋沉积物中的碳埋葬中起着重要作用。然而，BC在北冰洋中的封存很差。在这里，我们评估烟灰BC（SBC）的浓度，助熔剂和来源 - 来自东西伯利亚北极货架（ESAS），世界上最大的货架海洋系统的BC-in沉积物的最难治性成分。当代架子沉积物中的SBC浓度范围为0.1至2.1mg（-1）DW，对应于总有机碳的2-12％。随着海洋表面沉积物更接近人为排放的助熔剂，SBC的PB-210衍生的助熔剂（0.42-11g m（-2）Yr（-1））较高或在相同的范围内。 ESA中SBC的总埋沟（类似于4,000 Gg Yr（-1））说明了该北极架在SBC海洋封存中的重要意义。 SBC的radioCarbon信号显示出更耗尽的又更均匀的签名（-721至-896％;平均值-774 +/- 62％）比非SBC池（-304至-728％;平均值 - 491 +/- 163％），建议SBC平均地来自5,900 +/- 300岁，比非SBC池更旧的更具体的来源。我们估计输入到ESA的大气BC可忽略不计（类似于SBC埋葬助焊剂的0.6％）。统计源分配建模表明，通过解冻两种永久冻融碳（PF / C）系统来重新染色ESAS沉积SBC：表面土壤Permafrost（Topsoil / PF; 25 +/- 8％）和更新官冰复合体沉积物（ICD / PF; 75 +/- 8％）。 SBC对总动员的永久化冻融碳（PF / C）的贡献随着距离海岸（5至14％）的距离增加而增加，表明SBC比其他形式的转移PF / C更顽固。这些结果首次阐明了永久冻土解冻在SBC运输到北冰洋的关键作用。随着持续的全球变暖，这些发现对生物地球化学碳循环有影响，增加了这种难治性碳P的尺寸

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