Terrestrial dominance of sedimentary organic carbon sink in the Antarctic Weddell Sea since MIS 5
文献类型：期刊论文
| 作者 | Hu, Yihao2,6; Algeo, Thomas J.3,4,5; Guo, Jingteng6; Nan, Qingyun7; Tang, Zheng6; Xiong, Zhifang1,6; Li, Tiegang1,6 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2026-05-20 |
| 卷号 | 709页码:16 |
| 关键词 | Terrigenous input Organic carbon sources n -Alkanes Mixing model Southern Ocean delta C-13(org) |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2026.123369 |
| 通讯作者 | Guo, Jingteng(guojingteng@fio.org.cn) ; Li, Tiegang(tgli@fio.org.cn) |
| 英文摘要 | Terrestrial organic carbon (OC) input is a critical process driving the formation of sedimentary carbon reservoirs in continental margin environments. However, its role has long been underestimated in the Southern Ocean (SO) - a key region for global carbon sequestration. Along the Antarctic continental margin, glacial meltwater and iceberg activity continuously deliver substantial amounts of terrestrial OC to the deep sea, significantly influencing both the efficiency of OC burial and the global carbon balance. In this study, we investigate sediment core ANT34/D5-12 from the northern Weddell Sea to reconstruct changes in terrigenous input and sedimentary organic matter sources since Marine Isotope Stage 5 (MIS 5). Using an integrated approach combining elemental geochemistry, organic geochemical proxies, grain size analysis, and a stable isotope mixing model, we explore the mechanisms controlling sedimentary OC burial. Our results demonstrate that enhanced terrigenous input associated with ice sheet dynamics during glacial-interglacial cycles significantly increased carbon burial fluxes. Multiple geochemical proxies, including abundant long-chain n-alkanes with odd-over-even predominance, low ratios of low-to-high-molecular weight n-alkanes (L/H), high average chain length (ACL) values, and distinctly terrestrial delta C-13(org) signatures, consistently indicate that terrestrial OC has persistently dominated the sedimentary carbon pool (> 85%). This dominance is attributed to the inherently low transfer efficiency of marine organic matter in the SO and the refractory nature of terrestrial organic compounds. This study emphasizes the crucial role of Antarctic terrestrial ecosystems and ice sheet dynamics in regulating the SO carbon cycle and offers new insights into the potential response of polar carbon sinks under future climate change scenarios. |
| WOS关键词 | KING GEORGE ISLAND ; SOUTHERN-OCEAN ; EXPORT EFFICIENCY ; SURFACE SEDIMENTS ; NORTH-ATLANTIC ; INVERSE RELATIONSHIP ; ACCUMULATION RATES ; PARTICULATE EXPORT ; LIPID BIOMARKERS ; MARINE-SEDIMENTS |
| 资助项目 | Chinese Arctic and Antarctic Administration ; Basic Scientific Fund for National Public Research Institutes of China[2025Q08] ; National Natural Science Foundation of China (NSFC)[42076232] ; National Natural Science Foundation of China (NSFC)[42476267] ; National Natural Science Foundation of China (NSFC)[42006075] ; Taishan Scholars Project Funding[TS20190963] ; Taishan Scholars Project Funding[TSQN202211265] ; Impact and Response of Antarctic Seas to Climate Change Program[IRASCC2020-2022] ; Impact and Response of Antarctic Seas to Climate Change Program[01-03-02] ; Ocean Negative Carbon Emissions (ONCE) Program |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001728346400001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/205075]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Guo, Jingteng; Li, Tiegang |
| 作者单位 | 1.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 2.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 3.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China 4.China Univ Geosci, State Key Lab Geomicrobiol & Environm Changes GMEC, Wuhan 430074, Peoples R China 5.Univ Cincinnati, Dept Geosci, Cincinnati, OH 45221 USA 6.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China 7.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Yihao,Algeo, Thomas J.,Guo, Jingteng,et al. Terrestrial dominance of sedimentary organic carbon sink in the Antarctic Weddell Sea since MIS 5[J]. CHEMICAL GEOLOGY,2026,709:16. |
| APA | Hu, Yihao.,Algeo, Thomas J..,Guo, Jingteng.,Nan, Qingyun.,Tang, Zheng.,...&Li, Tiegang.(2026).Terrestrial dominance of sedimentary organic carbon sink in the Antarctic Weddell Sea since MIS 5.CHEMICAL GEOLOGY,709,16. |
| MLA | Hu, Yihao,et al."Terrestrial dominance of sedimentary organic carbon sink in the Antarctic Weddell Sea since MIS 5".CHEMICAL GEOLOGY 709(2026):16. |
入库方式： OAI收割
来源：海洋研究所
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