Differential Burial of Particulate Organic Carbon at the Chukchi Continental Margin, Arctic Ocean since Late-Pleistocene
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摘要: 有机碳埋藏是评价北冰洋碳封存能力的关键因素，但其在轨道时间尺度上的埋藏特征目前还存在很大的争论.通过分析楚克奇陆架边缘M04孔和周边表层沉积物中总有机碳、稳定碳同位素和生物标记物等指标，进一步探讨了晚更新世楚克奇陆架边缘有机碳的组成、来源、埋藏速率及其与周边冰盖的协同演化.结果表明，陆源有机碳是楚克奇陆架边缘有机碳埋藏的主体，且在冰期‒间冰期旋回中表现出了显著的差异性，间冰期（MIS1和MIS3）埋藏速率低，冰期（MIS4和MIS2）埋藏速率急骤升高.结合楚克奇陆架边缘的地貌特征和沉积环境，东西伯利亚冰盖（ESIS）的扩张和冰下排水系统的输运可能是陆架有机碳二次搬运、并在陆架边缘高速埋藏的主要控制因素.M04孔的沉积记录为梳理北冰洋有机碳的埋藏特征提供了新的视角，进一步揭示了高速沉积区有机碳埋藏的驱动机制，有助于客观评价北冰洋碳埋藏对全球碳封存的推动作用，但仍需要更多、特别是来自北极加拿大一侧的数据才能有效刻画北冰洋碳埋藏与气候转型之间的耦合关系.Abstract: The burial of particulate organic carbon is a critical factor in assessing the Arctic Ocean's carbon sequestration capacity, but its burial characteristics on orbital timescales remain highly debated. This study further explores the composition, source, and burial rate of organic matter in the Late Pleistocene and its co-evolution with the surrounding ice sheet by analyzing indicators such as total organic carbon, stable isotopes, and biomarkers in Core M04 at the Chukchi continental margin and the surrounding surface sediments. Results show that terrestrial organic carbon is the primary component of organic carbon burial at the Chukchi continental margin, with significant differences observed over glacial-interglacial cycles, with a low burial rate during the interglacial periods (MIS1 and MIS3) and a sharp increase in burial rate during the glacial periods (MIS4 and MIS2). Combined with the geomorphic features and depositional environment, the expansion of the East Siberian ice sheet (ESIS) and the transport of subglacial drainage systems may be the main controlling factors for the secondary transport of shelf organic carbon and its rapid burial at the continental margin. M04's records provide a new perspective to unravel the characteristics of organic carbon burial, further revealing the mechanisms in the high-sedimentation-rate area of the Arctic Ocean, and help to objectively evaluate the role of Arctic Ocean carbon burial in promoting global carbon sequestration. However, further research, especially records from Arctic Canada, is needed to fully describe the coupling relationship between Arctic Ocean carbon burial and climate transition.
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Key words:
- Arctic Ocean /
- Chukchi continental margin /
- organic carbon /
- carbon burial /
- carbon sequestration /
- glacial period /
- Late Pleistocene
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图 1 研究站位及区域概况
红色五角星指示M04孔站位，黄色圆点指示表层样站位；TPD和BG及橙色虚线箭头分别代表穿极流和波弗特环流，据Talley et al（2011）；SCC、AC和ACC及绿色虚线箭头分别指示西伯利亚沿岸流、阿纳德流和阿拉斯加沿岸流，据Corlett and Pickart（2017）；白色虚线指示1981年至2010年夏季平均海冰前缘，据Arguez et al.（2012）；MR、CP、NW、ESS、CS、BfS和BS分别代表门捷列夫洋脊、楚克奇海台、北风洋脊、楚克奇陆架、东西伯利亚陆架、波弗特陆架和白令海陆架；右上角小图中PS2741和96/12-1PC及橙色圆点指示参考柱样站位，据Löwemark et al.（2014）、Stein et al.（2001）；ESIS、LIS、IIS、GIS和EAIS分别代表东西伯利亚、劳伦泰、因纽特、格陵兰和欧亚冰盖
Fig. 1. Core sites and geographic settings
图 2 M04孔沉积地层和有机碳埋藏特征
B1和B2指示富锰褐色层；W3指示富钙白色层；带数字的黑色和橙色箭头分别指示AMS14C和古地磁年龄（a B.P.），引自Ye et al.（2022）；深海氧同位素阶段（MIS）用白色框（间冰期）和黑色框（冰期）表示，灰色条带指示间冰期
Fig. 2. Sedimentary stratigraphy and organic carbon burial characters in Core M04
图 3 稳定碳同位素与总有机碳含量和生物标志物的相关性
Fig. 3. Correlations of stable carbon isotope with its content and biomarkers
表 1 生物标志化合物分子组合指标
Table 1. Proxies of molecular combination of biomarkers
年代 层位(cm) Σn-Alk
(μg/(cm2·ka))∑T/
∑MBIT OEP CPI MIS1 5 6.71 2.19 0.69 3.05 2.51 11 7.69 2.68 0.74 2.89 2.27 27 6.95 2.72 0.93 3.39 2.52 MIS2 66 15.83 1.83 0.62 3.67 2.86 106 14.68 2.06 0.73 3.83 2.93 146 11.86 2.21 0.74 2.84 2.39 
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