Variability in radiocarbon ages of biochemical compound classes of high molecular weight dissolved organic matter in estuaries

doi:10.1016/j.eccs.2006.01.018

	Variability in radiocarbon ages of biochemical compound classes of high molecular weight dissolved organic matter in estuaries
	Wang, XC; Callahan, J ; Chen, RF
	2006-06-01
发表期刊	ESTUARINE COASTAL AND SHELF SCIENCE
ISSN	0272-7714
卷号	68 期号:1-2 页码:188-194
文章类型	Article
摘要	High molecular weight dissolved organic matter (HMW-DOM, > 1000 Da) represents a major fraction (> 30%) of dissolved organic carbon (DOC) in the ocean and thus plays an important role in the global biogeochemical cycling of carbon and many other elements. Its organic sources and formation mechanisms, however, are still not well understood especially in estuarine and coastal regions where multiple natural and anthropogenic sources contribute to total HMW-DOM. In this paper we report our measurements of natural radiocarbon (C-14) abundances and stable carbon isotope (C-13) compositions of the major biochemical compound classes: amino acids, carbohydrates and lipids separated from eight HMW-DOM samples collected from five US estuaries as part of our on-going study of sources, distribution and transport of chromophoric dissolved organic matter (CDOM) in estuarine and coastal waters. Distinct differences in both C-14 and C-13 values were found among the bulk HMW-DOM samples as well as the individual compound classes. Radiocarbon ages of the major compound classes varied by as much as 27,000 years in a single sample. The calculated average radiocarbon ages of the compound fractions of HMW-DOM indicate that the total lipid fraction is very "old", while the acid-insoluble fraction is slightly younger. Total amino acid and carbohydrate fractions, however, have relatively modern apparent C-14 ages. The significant variability in C-14 ages among the compound classes indicates not only multiple organic carbon sources but also different formation and turnover pathways controlling the cycling of different biochemical components of HMW-DOM in estuarine and coastal waters. (c) 2006 Elsevier Ltd. All rights reserved.; High molecular weight dissolved organic matter (HMW-DOM, > 1000 Da) represents a major fraction (> 30%) of dissolved organic carbon (DOC) in the ocean and thus plays an important role in the global biogeochemical cycling of carbon and many other elements. Its organic sources and formation mechanisms, however, are still not well understood especially in estuarine and coastal regions where multiple natural and anthropogenic sources contribute to total HMW-DOM. In this paper we report our measurements of natural radiocarbon (C-14) abundances and stable carbon isotope (C-13) compositions of the major biochemical compound classes: amino acids, carbohydrates and lipids separated from eight HMW-DOM samples collected from five US estuaries as part of our on-going study of sources, distribution and transport of chromophoric dissolved organic matter (CDOM) in estuarine and coastal waters. Distinct differences in both C-14 and C-13 values were found among the bulk HMW-DOM samples as well as the individual compound classes. Radiocarbon ages of the major compound classes varied by as much as 27,000 years in a single sample. The calculated average radiocarbon ages of the compound fractions of HMW-DOM indicate that the total lipid fraction is very "old", while the acid-insoluble fraction is slightly younger. Total amino acid and carbohydrate fractions, however, have relatively modern apparent C-14 ages. The significant variability in C-14 ages among the compound classes indicates not only multiple organic carbon sources but also different formation and turnover pathways controlling the cycling of different biochemical components of HMW-DOM in estuarine and coastal waters. (c) 2006 Elsevier Ltd. All rights reserved.
关键词	Estuary Dissolved Organic Matter Hmw-dom Radiocarbon Age Organic Fractions
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1016/j.eccs.2006.01.018
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000238604500017
引用统计	被引频次：9[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/337002/5476
专题	海洋生态与环境科学重点实验室海洋生物技术研发中心
作者单位	1.Univ Massachusetts, Dept Environm Earth & Ocean Sci, Boston, MA 02125 USA 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Wang, XC,Callahan, J,Chen, RF. Variability in radiocarbon ages of biochemical compound classes of high molecular weight dissolved organic matter in estuaries[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2006,68(1-2):188-194.
APA	Wang, XC,Callahan, J,&Chen, RF.(2006).Variability in radiocarbon ages of biochemical compound classes of high molecular weight dissolved organic matter in estuaries.ESTUARINE COASTAL AND SHELF SCIENCE,68(1-2),188-194.
MLA	Wang, XC,et al."Variability in radiocarbon ages of biochemical compound classes of high molecular weight dissolved organic matter in estuaries".ESTUARINE COASTAL AND SHELF SCIENCE 68.1-2(2006):188-194.

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