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地球科学进展  2020, Vol. 35 Issue (10): 1073-1086    DOI: 10.11867/j.issn.1001-8166.2020.086
水生关键带有机碳循环过程:从分子水平到全球尺度     
北极东西伯利亚陆架沉积有机碳的源汇过程研究进展
胡利民1,2,3(),石学法2,3,叶君2,3,张钰莹2
1.中国海洋大学海洋地球科学学院 海底科学与探测技术教育部重点实验室,山东 青岛 266100
2.自然资源部第一海洋研究所 海洋沉积与成矿作用重点实验室,山东 青岛 266061
3.青岛 海洋科学与技术试点国家实验室 海洋地质过程与环境功能实验室,山东 青岛 266237
Advances in the Sources and Sink of Sedimentary Organic Carbon in the East Siberian Arctic Shelf
Limin Hu1,2,3(),Xuefa Shi2,3,Jun Ye2,3,Yuying Zhang2
1.College of Marine Geosciences,Key Laboratory of Submarine Geosciences and Prospecting Technology,Ocean University of China,Qingdao 266100,China
2.Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China
3.Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China
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摘要:

东西伯利亚陆架作为全球最为宽浅的陆架之一,在全球变暖和北极快速变化背景下,受海冰减少、冻土退化、径流增加和海岸侵蚀加剧等因素的影响,该区沉积有机碳的来源、输运和埋藏发生着显著变化,且不同地区之间差异显著。东西伯利亚海西部和拉普捷夫海沉积有机碳以陆源贡献为主,海岸侵蚀作用提高了冻土碳的入海通量,对气候变化具正反馈效应;楚科奇海具有较高的有机碳埋藏效率,季节性海冰变化对有机碳的源汇有直接的影响。受沉积水动力作用影响,陆源沉积有机碳从勒拿河河口输运到陆架边缘需3 000~4 000年,不同类型有机碳存在显著的分异和降解。陆架有机碳埋藏具有显著的时空差异,大量高活性的冻土碳由陆向海的快速沉积对于北极土壤碳库的稳定性、水生环境有机碳的矿化及CO2的排放等方面具有重要的意义。今后该区的研究应加强综合地球化学指标和典型有机分子碳同位素等手段的应用,开展区域对比研究,重视海冰过程与有机碳源汇的联系,结合区域碳循环多模型集成,从现代过程与地质记录、替代指标与数值模拟相结合的角度去认识不同时间尺度快速气候变化下的有机碳源汇格局及其气候环境效应。

关键词: 沉积有机碳源汇海冰冻土碳北极东西伯利亚陆架气候变化    
Abstract:

The East Siberian Arctic Shelf (ESAS) is one of the widest and shallowest continental shelves in the world. In the context of the global warming and rapid Arctic changes, the sources, transport and burial of sedimentary Organic Carbon (OC) in this area have experienced significant changes with spatial heterogeneity, which could be related to the sea-ice reduction, permafrost degradation, increased runoff and intensified coastal erosion. The sedimentary OC is mainly contributed by Terrestrial Organic Carbon (TerrOC) in the western East Siberian Sea and the Laptev Sea, and the coastal erosion increases the flux of Permafrost Carbon (PF/C) with a positive climate feedback effect. The Chukchi Sea has high organic carbon burial efficiency, where the seasonal variation of sea ice has direct effect on the source and sink of OC. Under the influence of hydrodynamic sorting, the cross-shelf transport times of TerrOC from the Lena estuary to the shelf edge requires approximately 3 000~4 000 years, by coupling with a significant geochemical differentiation and degradation. There existed spatio-temporal variation for the OC burial on the ESAS, and the large amount and rapid deposition of highly-reactive PF/C from the land to the sea could have important significance for the Arctic soil carbon, the OC mineralization in the aquatic environment, and CO2 outgassing. The following research should strengthen the application of the comprehensive geochemical indices and the compound-specific isotope method, emphasizing the relation between the sea-ice and the sources and sink of the OC. By coupling with the models of regional carbon cycle, we should emphasize the integration of the modern process and geological records, proxy records with the numerical simulation, which is necessary to better understand the sources and sink of sedimentary OC and the climate and environmental effect from the varied timescales.

Key words: Source and sink of sediment organic carbon    Sea ice    Permafrost carbon    The East Siberian Arctic Shelf    Climate change
收稿日期: 2020-09-01 出版日期: 2020-11-30
ZTFLH:  P736.4  
基金资助: 国家自然科学基金优秀青年科学基金项目“海洋沉积地球化学:沉积有机质的源汇过程及其环境响应”(41722603);国家自然科学基金面上项目“近百年亚欧北极陆架沉积有机碳源汇差异性演化:海冰变化与冻土碳输入的制约”(42076074)
作者简介: 胡利民(1983-),男,山东聊城人,教授,主要从事海洋沉积地球化学与有机地球化学研究. E-mail:hulimin@ouc.edu.cn
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胡利民,石学法,叶君,张钰莹. 北极东西伯利亚陆架沉积有机碳的源汇过程研究进展[J]. 地球科学进展, 2020, 35(10): 1073-1086.

Limin Hu,Xuefa Shi,Jun Ye,Yuying Zhang. Advances in the Sources and Sink of Sedimentary Organic Carbon in the East Siberian Arctic Shelf. Advances in Earth Science, 2020, 35(10): 1073-1086.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2020.086        http://www.adearth.ac.cn/CN/Y2020/V35/I10/1073

图1  北极陆架沉积有机碳输入示意图(据参考文献[15,17]修改)
图2  北极东西伯利亚陆架区域地理位置
图3  北极东西伯利亚陆架沉积有机碳的来源及空间分布(据参考文献[21]修改,端元值来源于参考文献[21],数据来源于参考文献[21,31,34,35])(a)沉积有机碳来源的端元分析;(b)不同来源沉积有机碳的空间分布
图4  东西伯利亚陆架陆源沉积有机碳的跨陆架输运时间(据参考文献[32]修改)
图5  北极陆架沉积有机碳埋藏保存概念模式图(据参考文献[87]修改)
图6  东西伯利亚陆架不同来源有机碳通量模式图(据参考文献[21]修改)
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