气候变化领域集成服务门户(CCPortal): Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

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DOI	10.3389/fmars.2024.1308739
	Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes
	Gao, Qin; Piotrowski, Alexander M.; Li, Zilong; Loh, Pei Sun; Han, Cuicui; Wang, Zixuan; Yang, Shihang; Guo, Zengqing; Huang, Dongqin; Chen, Yanting
发表日期	2024
EISSN	2296-7745
起始页码	11
卷号	11
英文摘要	The correlation between the amount of organic carbon (OC) and sulfur (S) in sediments has been widely used as a paleosalinity indicator to distinguish between marine and freshwater environments. However, whether the ratio of total OC to total S (TOC/TS) can be used to identify unsteady or dynamic marine environments across sedimentary strata is still contended. An HZW1907 sediment core of 80 m in length was successfully collected in the middle of Hangzhou Bay (HZB), serving as one of the few boreholes that are crucial for the study of geologic and geo-environment changes in the coastal regions of eastern China since the Last Glacial Maximum (LGM). Total OC (TOC), stable carbon isotope, and TS of 82 subsamples from the HZW1907 core were analyzed to reconstruct the history of the shallow water biological pump and sulfur preservation record in the bay since the Late Pleistocene. Our results indicate that the samples had low concentrations of TOC (0.21%) and total nitrogen (TN) (0.02%), high mass ratio of TOC/TN (10.8), low delta C-13 (-24.9 parts per thousand), low TS content (0.06%), and a high ratio of TOC/TS (9.1) from 33.6 ka BP to 12.3 ka BP, implying that freshwater organic matter (OM), algae, and C3 plant fragments were the main sources of OM in a relatively cold environment. The abundances of TOC, TN, and TS increased to 0.56%, 0.07%, and 0.4%, respectively, while delta C-13 (-23.9 parts per thousand) increased and TOC/TS (2.7) decreased in the Holocene sediments, suggesting that seawater began to influence the composition of the sediments of HZB. Climate warming, which is likely to have impacted the results, was experienced from 12.3 ka BP. An OC isotope mixing model indicated that since the Mid-late Holocene, more than 70% of riverine OM accounted for the total OM. The TOC/TS ratio was identified as an effective indicator of seawater intrusion, with C/S ratios of 1-6 being considered to indicate a sea-land transitional zone sedimentary environment, a C/S >6 indicating freshwater, and a C/S<1 indicating normal marine facies. These findings provide crucial evidence for using TOC/TS to distinguish freshwater from marine environments and enhance our understanding of past climate changes. Therefore, these geochemical indicators can be used in conjunction with other sedimentary records to obtain accurate results about sedimentary evolution.
英文关键词	organic carbon; sulfur biogeochemistry; sea level; delta-shelf-estuary system; climate change; Hangzhou Bay
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001190125400001
来源期刊	FRONTIERS IN MARINE SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306280
作者单位	Zhejiang University; University of Cambridge; Shanghai Ocean University; Ministry of Natural Resources of the People's Republic of China; Second Institute of Oceanography, Ministry of Natural Resources; POWERCHINA Huadong Engineering Corporation Limited
推荐引用方式 GB/T 7714	Gao, Qin,Piotrowski, Alexander M.,Li, Zilong,et al. Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes[J],2024,11.
APA	Gao, Qin.,Piotrowski, Alexander M..,Li, Zilong.,Loh, Pei Sun.,Han, Cuicui.,...&Chen, Yanting.(2024).Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes.FRONTIERS IN MARINE SCIENCE,11.
MLA	Gao, Qin,et al."Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes".FRONTIERS IN MARINE SCIENCE 11(2024).