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Increase of organic carbon burial promoted the glacial decrease of atmospheric CO2: A case study from the Bengal-Indus fans

文献类型：期刊论文

作者Zhang, Bin1; Xu, Zhaokai1,2; Yu, Zhaojie1,2,3; Yang, Yifei1,4; Wan, Shiming1,2
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2025-08-01
卷号671页码:13
关键词Bengal Fan Indus Fan Organic carbon burial flux Glacial-interglacial cycles
ISSN号0031-0182
DOI10.1016/j.palaeo.2025.112986
通讯作者Xu, Zhaokai(zhaokaixu@qdio.ac.cn) ; Yu, Zhaojie(yuzhaojie@qdio.ac.cn)
英文摘要Elucidating the burial mechanism of organic carbon (OC) in the Bengal-Indus Fans, the principal sink for weathering and erosion products from the Himalayas, is essential for deciphering the global carbon cycle and climate change. This study investigates the quantitative source-to-sink processes and controlling mechanisms of OC burial throughout Quaternary glacial-interglacial cycles using organic carbon isotope, total organic carbon content, mass accumulation rate, and a three-endmember mixing model to partition contributions from terrigenous C-3/C-4 plants and marine phytoplankton. The results indicate a significantly higher contribution of OC burial from C-4 plants during glacial periods, while C-3 and marine sources show opposing trends. Mass accumulation rates of terrigenous and marine OC increase during glacial periods and decrease during interglacials. Orbital variations in OC burial flux in the Bengal-Indus Fans are primarily influenced by glacial erosion of the Himalayas and monsoonal precipitation. Glacial erosion regulates the transport of terrigenous OC and nutrients to the ocean, thereby affecting marine primary productivity. Simultaneously, monsoonal precipitation influences plant composition in terrigenous regions and modulates the preservation efficiency of OC. Our calculations indicate that during glacial periods, the OC burial flux reached 0.8 x 10(12) mol/year. Assuming a total atmospheric CO2 decline of similar to 80 ppmv during glacials, this burial flux contributed approximately 5 % (similar to 4 ppmv) to the CO2 drawdown, with marine OC accounting for 41-45 % of the total. These findings highlight the significant role of OC burial in the Bengal-Indus Fans in atmospheric CO2 sequestration, thus contributing to global cooling during glacial periods.
WOS关键词INDIAN-SUMMER MONSOON ; EASTERN ARABIAN SEA ; LATE-QUATERNARY ; MATTER PRESERVATION ; EROSIONAL HISTORY ; NORTHERN BAY ; SITE U1456 ; SEDIMENT ; HIMALAYAN ; RIVER
资助项目National Key Research and Development Program of China[2022YFF0800503] ; National Natural Science Foundation of China[42376055] ; Natural Science Foundation of Shandong[ZR2022YQ33] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; Laoshan Laboratory[LSKJ202204200] ; [W2421051]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
WOS记录号WOS:001485618500001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/202013]  
专题海洋研究所_海洋环流与波动重点实验室
通讯作者Xu, Zhaokai; Yu, Zhaojie
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China
3.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Bin,Xu, Zhaokai,Yu, Zhaojie,et al. Increase of organic carbon burial promoted the glacial decrease of atmospheric CO2: A case study from the Bengal-Indus fans[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2025,671:13.
APA Zhang, Bin,Xu, Zhaokai,Yu, Zhaojie,Yang, Yifei,&Wan, Shiming.(2025).Increase of organic carbon burial promoted the glacial decrease of atmospheric CO2: A case study from the Bengal-Indus fans.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,671,13.
MLA Zhang, Bin,et al."Increase of organic carbon burial promoted the glacial decrease of atmospheric CO2: A case study from the Bengal-Indus fans".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 671(2025):13.

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来源：海洋研究所

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