Spatial variability in the abundance, composition, and age of organic matter in surficial sediments of the East China Sea Wu, Ying Eglinton, Timothy I. Yang, Liyang Deng, Bing Montlucon, Daniel B. Zhang, Jing 2014-02-21T17:33:58Z 2014-10-22T08:57:26Z 2013-11-15
dc.description Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 118 (2013): 1495–1507, doi:10.1002/2013JG002286. en_US
dc.description.abstract Understanding the sources and fate of organic matter (OM) sequestered in continental margin sediments is of importance because the mode and efficiency of OM burial impact the carbon cycle and the regulation of atmospheric CO2 over long time scales. We carried out molecular (lignin-derived phenols from CuO oxidation), elemental, isotopic (δ13C, Δ14C), and sedimentological (grain size and mineral surface area) analyses in order to examine spatial variability in the abundance, source, age of surface sediments of the East China Sea. Higher terrigenous organic matter values were found in the main accumulating areas of fluvial sediments, including the Changjiang (Yangtze) Estuary and Zhejiang-Fujian coastal zone. Isotopic and biomarker data suggest that the sedimentary OM in the inner shelf region was dominated by aged (Δ14C = −423 ± 42‰) but relatively lignin-rich OM (Λ = 0.94 ± 0.57 mg/100 mg OC) associated with fine-grained sediments, suggesting important contributions from soils. In contrast, samples from the outer shelf, while of similar age (Δ14 C = −450 ± 99‰), are lignin poor (Λ = 0.25 ± 0.14 mg/100 mg OC) and associated with coarse-grained material. Regional variation of lignin phenols and OM ages indicates that OM content is fundamentally controlled by hydrodynamic sorting (especially, sediment redistribution and winnowing) and in situ primary production. Selective sorption of acid to aldehyde in clay fraction also modified the ratios of lignin phenols. The burial of lignin in East China Sea is estimated to be relatively efficient, possibly as a consequence of terrigenous OM recalcitrance and/or relatively high sedimentation rates in the Changjiang Estuary and the adjacent Zhejing-Fujian mud belt. en_US
dc.description.embargo 2014-05-15 en_US
dc.description.sponsorship This study was funded by the Natural Science Foundation of China (41021064), Ministry of Science and Technology (2011CB409802), and others such as (41076052, 2010DFA24590). WY acknowledges financial support from the Alexander von Humboldt Foundation and SKLCE RCD and 111 projects. TE acknowledges financial support from a WHOI Senior Scientist Chair. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research: Biogeosciences 118 (2013): 1495–1507 en_US
dc.identifier.doi 10.1002/2013JG002286
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.subject Radiocarbon ages en_US
dc.subject Lignin phenols en_US
dc.subject Sediment en_US
dc.title Spatial variability in the abundance, composition, and age of organic matter in surficial sediments of the East China Sea en_US
dc.type Article en_US
dspace.entity.type Publication
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