Preservation of black carbon in the shelf sediments of the East China Sea

doi:10.1007/s11434-007-0452-1

IOCAS-IR > 海洋地质与环境重点实验室

	Preservation of black carbon in the shelf sediments of the East China Sea
	Wang XuChen ; Li AnChun
	2007-11-01
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	52 期号:22 页码:3155-3161
文章类型	Article
摘要	Concentrations and carbon isotopic (C-14, C-13) compositions of black carbon (BC) were measured for three sediment cores collected from the Changjiang River estuary and the shelf of the East China Sea. BC concentrations ranged from 0.02 to 0.14 mg/g (dry weight), and accounted for 5% to 26% of the sedimentary total organic carbon (TOC) pool. Among the three sediment cores collected at each site, sediment from the Changjiang River estuary had relatively high BC contents compared with the sediments from the East China Sea shelf, suggesting that the Changjiang River discharge played an important role in the delivery of BC to the coastal region. Radiocarbon measurements indicate that the ages of BC are in the range of 6910 to 12250 years old B. P. (before present), that is in general, 3700 to 9000 years older than the C-14 ages of TOC in the sediments. These variable radiocarbon ages suggest that the BC preserved in the sediments was derived from the products of both biomass fire and fossil fuel combustion, as well as from ancient rock weathering. Based on an isotopic mass balance model, we calculated that fossil fuel combustion contributed most (60%. 80%) of the BC preserved in these sediments and varied with depth and locations. The deposition and burial of this "slow-cycling" BC in the sediments of the East China Sea shelf represent a significant pool of carbon sink and could greatly influence carbon cycling in the region.; Concentrations and carbon isotopic (C-14, C-13) compositions of black carbon (BC) were measured for three sediment cores collected from the Changjiang River estuary and the shelf of the East China Sea. BC concentrations ranged from 0.02 to 0.14 mg/g (dry weight), and accounted for 5% to 26% of the sedimentary total organic carbon (TOC) pool. Among the three sediment cores collected at each site, sediment from the Changjiang River estuary had relatively high BC contents compared with the sediments from the East China Sea shelf, suggesting that the Changjiang River discharge played an important role in the delivery of BC to the coastal region. Radiocarbon measurements indicate that the ages of BC are in the range of 6910 to 12250 years old B. P. (before present), that is in general, 3700 to 9000 years older than the C-14 ages of TOC in the sediments. These variable radiocarbon ages suggest that the BC preserved in the sediments was derived from the products of both biomass fire and fossil fuel combustion, as well as from ancient rock weathering. Based on an isotopic mass balance model, we calculated that fossil fuel combustion contributed most (60%. 80%) of the BC preserved in these sediments and varied with depth and locations. The deposition and burial of this "slow-cycling" BC in the sediments of the East China Sea shelf represent a significant pool of carbon sink and could greatly influence carbon cycling in the region.
关键词	Black Carbon Marine Sediment Carbon Cycle Changjiang River Estuary East China Sea
学科领域	Multidisciplinary Sciences
DOI	10.1007/s11434-007-0452-1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000251018700018
引用统计	被引频次：32[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/5070
专题	海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Massachusetts, Dept Environm Earth & Ocean Sci, Boston, MA 02120 USA
推荐引用方式 GB/T 7714	Wang XuChen,Li AnChun. Preservation of black carbon in the shelf sediments of the East China Sea[J]. CHINESE SCIENCE BULLETIN,2007,52(22):3155-3161.
APA	Wang XuChen,&Li AnChun.(2007).Preservation of black carbon in the shelf sediments of the East China Sea.CHINESE SCIENCE BULLETIN,52(22),3155-3161.
MLA	Wang XuChen,et al."Preservation of black carbon in the shelf sediments of the East China Sea".CHINESE SCIENCE BULLETIN 52.22(2007):3155-3161.

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