| 基于210Pb测年法的楚科奇海陆架北缘有机碳沉积通量研究 |
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| 引用本文： | 余雯,何建华,李奕良,苏健.基于210Pb测年法的楚科奇海陆架北缘有机碳沉积通量研究[J].极地研究,2012,24(4):391-396. |
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| 作者姓名： | 余雯 何建华 李奕良 苏健 |
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| 作者单位： | 1.国家海洋局海洋-大气化学与全球变化重点实验室，福建 厦门 361005； ;2.国家海洋局第三海洋研究所，福建 厦门 361005； ;3.清华大学工程物理系，北京 100084 |
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| 基金项目： | 极地战略青年基金;国际极地年中国行动计划专项 |
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| 摘 要： | 有机碳沉积作用在一定时间尺度上形成海洋碳汇作用的最终净效应，北冰洋陆架的有机碳沉积作用在全球碳循环中有着尤为重要的地位。为了测定楚科奇海陆架的有机碳沉积通量，本文应用210Pb测年法对中国第3次北极考察R17站位的沉积物样品的年龄及沉积速率进行了分析测定，并结合表层沉积物中有机碳的含量计算得到了楚科奇海陆架北缘的有机碳沉积通量。结果显示，该站位的沉积速率为0.6 mm/a，表观沉积质量通量为0.72 kg/m2/a，有机碳沉积通量为517 mmol C/m2/a。经估算，真光层输出的有机碳中约有29 %被长期封存在沉积物中，远高于中低纬度的正常值（~10 %），说明楚科奇海陆架区具有高效的碳汇作用。
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| 关 键 词： | 有机碳沉积通量 210Pb测年法 楚科奇海陆架 |
| 收稿时间： | 2012-04-16 |
210Pb-DERIVED ORGANIC CARBON DEPOSITION FLUX ON THE NORTH CHUKCHI SHELF |
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| Yu Wen,He Jianhua,Li Yiliang,Su Jian.210Pb-DERIVED ORGANIC CARBON DEPOSITION FLUX ON THE NORTH CHUKCHI SHELF[J].Chinese Journal of Polar Research,2012,24(4):391-396. |
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| Authors: | Yu Wen He Jianhua Li Yiliang Su Jian |
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| Institution: | 1.Key Laboratory of Global Change and Marine-Atmosphere Chemistry, State Oceanic Administration, Xiamen 361005, China;2.Third Institute of Oceanography, SOA, Xiamen 361005, China;3.Department of Engineering Physics, Beijing 100084, China |
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| Abstract: | Deposition of organic carbon forms the final net effect of the ocean carbon sink in a certain time scale, and the organic carbon deposition of Arctic shelf plays a particularly important role in the global carbon cycle due to its broad shelf area. In order to determine the organic carbon deposition flux at the north margin of Chukchi shelf, 210Pb dating method was applied to analyze the age and deposition rate of sediment samples from station R17 of the 3rd Chinese National Arctic Research Expedition. The results show that the deposition rate was 0.6 mm/a, the apparent deposition mass flux was 0.72 kg/m2/a, and the organic carbon deposition flux was 517 mmol C/m2/a, respectively. It was estimated that 29 % of the export organic carbon flux out of the euphotic zone was transferred and chronically buried into the sediment, which was much higher than the average ratio (~ 10 %) of the low-/mid-latitude region, indicating a highly effective carbon sink at the north margin of Chukchi shelf. |
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| Keywords: | organic carbon deposition 210Pb dating Chukchi Shelf |
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