Preservation of Organic Carbon Associated with Iron on Continental Shelves Influenced by Hydrodynamic Processes

被引：1

作者：

Li, Haoshuai ^{[1
,2
,3
]}

Lin, Deju ^{[1
,2
,3
]}

Zhang, Haiyang ^{[1
,2
,3
]}

Wang, Nan ^{[4
,5
]}

Zhou, Yang ^{[6
]}

Wu, Weifeng ^{[1
,2
,3
]}

Liu, Jingyu ^{[1
,2
,3
]}

Che, Yangli ^{[1
,2
,3
]}

Xia, Cuimei ^{[1
,2
,3
]}

Zhu, Longhai ^{[4
,5
]}

Peng, Chuanzhao ^{[1
,2
,3
]}

Liu, Qian ^{[1
,2
,3
]}

He, Qian ^{[1
,2
,3
]}

Bao, Rui ^{[1
,2
,3
]}

机构：

[1] Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao 266100, Peoples R China

[2] Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

[3] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266100, Peoples R China

[4] Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Peoples R China

[5] Ocean Univ China, Coll Marine Geosci, Qingdao, Peoples R China

[6] Guangzhou Marine Geol Survey, Guangzhou 511458, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2024年 / 58卷 / 33期

基金：

中国国家自然科学基金;

关键词：

organic carbon; marine sediments; iron; carbon cycle; hydrodynamic processes; EAST CHINA SEA; MATTER PRESERVATION; SURFACE SEDIMENTS; REACTIVE IRON; FATE; GEOCHEMISTRY; ACCUMULATION; VARIABILITY; TRANSPORT; ANCIENT;

D O I：

10.1021/acs.est.4c01727

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Understanding the environmental fate of organic carbon associated with iron (OC-Fe) is critically important for investigating OC preservation in aquatic systems. Here, we first investigate C-13 and C-14 isotopes of OC-Fe within grain size-fractionated sediments retrieved from the East China Sea and estimate their sources and reactivities of OC-Fe through isotope-mixing models and thermal pyrolysis approaches in order to reveal the fate of OC-Fe on continental shelves influenced by hydrodynamic processes. Our results show that the OC-Fe proportion in total OC (f(OC-Fe)) in the sortable silt fractions (20-63 mu m) is the highest among three grain size fractions, likely suggesting that hydrodynamics may enhance the iron protection on OC. In addition, Delta C-14(OC-Fe) values fall within the range of from -358.73 to -64.03 parts per thousand, and both Delta C-14(OC-Fe) values and ancient OC-Fe% exhibit strong positive linear relationships with f(OC-Fe). This emphasized that the hydrodynamic processes may cause the ancient OC to be tightly associated with Fe, accompanying OC-Fe aging. Our findings shed new light on the preservation of OC-Fe in marginal seas to advance the recognition of carbon "rusty sinks" in seafloor sediments.

引用

页码：14698 / 14708

页数：11

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