Millennial scale persistence of organic carbon bound to iron in Arctic marine sediments.
Millennial scale persistence of organic carbon bound to iron in Arctic marine sediments.
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DOI：
10.1038/s41467-020-20550-0
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发表时间：
2021-01-12
影响因子：
16.6
通讯作者：
März C
中科院分区：
文献类型：
--
作者：
Faust JC;Tessin A;Fisher BJ;Zindorf M;Papadaki S;Hendry KR;Doyle KA;März C
海洋沉积物中有机物质的埋藏代表了全球长期碳封存的主要自然机制，但这种碳汇的关键方面仍未得到解决。对表面沉积物的研究得出这样的结论：平均 10-20% 的沉积有机碳通过与活性金属（例如铁和锰）氧化物结合而得到稳定并受到物理保护，免受微生物降解。在这里，我们通过分析巴伦支海四个地点的沉积物和孔隙水的化学成分来检查这个生锈的碳汇的长期效率。我们的研究结果表明，碳-铁耦合在最上面的含氧沉积物层下方持续存在了数千年。我们进一步提出，自生共沉淀不是这些北极陆架沉积物中碳-铁结合的主导因素，并且有机碳的很大一部分在沉积在海底之前已经与活性铁结合。海洋沉积物中埋藏的有机物质可以封存大量碳，但人们对这种碳汇的动态知之甚少。在这里，作者研究了北极陆架沉积物中所谓的“生锈碳汇”，发现有机碳-铁组合可以稳定数千年。
Burial of organic material in marine sediments represents a dominant natural mechanism of long-term carbon sequestration globally, but critical aspects of this carbon sink remain unresolved. Investigation of surface sediments led to the proposition that on average 10-20% of sedimentary organic carbon is stabilised and physically protected against microbial degradation through binding to reactive metal (e.g. iron and manganese) oxides. Here we examine the long-term efficiency of this rusty carbon sink by analysing the chemical composition of sediments and pore waters from four locations in the Barents Sea. Our findings show that the carbon-iron coupling persists below the uppermost, oxygenated sediment layer over thousands of years. We further propose that authigenic coprecipitation is not the dominant factor of the carbon-iron bounding in these Arctic shelf sediments and that a substantial fraction of the organic carbon is already bound to reactive iron prior deposition on the seafloor. Burial of organic material in marine sediments can sequester massive amounts of carbon, but the dynamics of this carbon sink are poorly understood. Here the authors investigate the so-called rusty carbon sink in Arctic shelf sediments, finding that organic carbon-iron associations are stable for 1000 s of years.
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影响因子：
3.7
作者：
Dalpadado P;Arrigo KR;Hjøllo SS;Rey F;Ingvaldsen RB;Sperfeld E;van Dijken GL;Stige LC;Olsen A;Ottersen G
通讯作者：
Ottersen G
影响因子：
3.7
作者：
Estes, E. R.;Andeer, P. F.;Hansel, C. M.
通讯作者：
Hansel, C. M.
影响因子：
3.6
作者：
Harris, CL;Plueddemann, AJ;Gawarkiewicz, GG
通讯作者：
Gawarkiewicz, GG
影响因子：
5.2
作者：
Jakobsson, Martin;Mayer, Larry;Weatherall, Pauline
通讯作者：
Weatherall, Pauline
影响因子：
3
作者：
Barber, Andrew;Lalonde, Karine;Gelinas, Yves
通讯作者：
Gelinas, Yves