Variations in organic carbon loading of surface sediments from the shelf to the slope of the Chukchi Sea, Arctic Ocean

Variations in organic carbon loading of surface sediments from the shelf to the slope of the Chukchi Sea, Arctic Ocean
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北冰洋楚科奇海陆架到斜坡表层沉积物有机碳负荷变化

DOI：
10.1007/s13131-017-1026-y
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发表时间：
2017-06
期刊：
ACTA OCEANOLOGICA SINICA
影响因子：
1.4
通讯作者：
Chen Jianfang
Chen Jianfang
中科院分区：
地球科学2区
文献类型：
--
作者：
Li Zhongqiao;Wang Xinyi;Jin Haiyan;Ji Zhongqiang;Bai Youcheng;Chen Jianfang

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有机碳（OC）含量归一化为沉积物的比表面积（SSA）被广泛用于跟踪OC负荷（OC/SSA）的变化。本文对北极边缘海楚科奇海表层沉积物的有机碳/SSA进行了观测。陆架沉积物表现出更高的OC/SSA值比研究区的斜坡沉积物。与东西伯利亚陆架和麦肯齐河的OC/SSA值相比，斜坡沉积物具有较低的OC负荷。这种OC/SSA的突然下降主要与斜坡上较低的初级生产力以及可能的氧化过程有关。有机碳与SSA的线性回归分析结果表明，楚科奇海沉积物中存在有机碳的沉积烃源岩。此外，低SSA的陆架沉积物比斜坡沉积物具有更大的岩石有机碳组分。本研究的数据集，使区域OC循环在楚科奇海更透彻的了解。
The content of organic carbon (OC) normalized to the specific surface area (SSA) of sediment is widely used to trace variations in OC loading (OC/SSA). This study presents observations of OC/SSA of surface sediments collected in the Chukchi Sea, a typical Arctic marginal sea. Shelf sediments exhibit much higher OC/SSA values than slope sediments in the study area. Compared with OC/SSA values reported from the East Siberian Shelf and Mackenzie River, the slope sediments possess lower OC loading. This abrupt decrease in OC/SSA is mostly related to the lower primary production on slope as well as possible oxidization processes. The results of linear regression analysis between OC and SSA indicate a sedimentary source rock for the OC in the Chukchi Sea sediments. Moreover, shelf sediments with low SSA possess a larger rock OC fraction than slope sediments do. The dataset of the present study enables a more thorough understanding of regional OC cycling in the Chukchi Sea.
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