气候变化领域集成服务门户(CCPortal): Influence of Hydrodynamic Processes on the Fate of Sedimentary Organic Matter on Continental Margins

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DOI	10.1029/2018GB005921
	Influence of Hydrodynamic Processes on the Fate of Sedimentary Organic Matter on Continental Margins
	Bao R.; van der Voort T.S.; Zhao M.; Guo X.; Montluçon D.B.; McIntyre C.; Eglinton T.I.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1420
结束页码	1432
卷号	32 期号:9
英文摘要	Understanding the effects of hydrodynamic forcing on organic matter (OM) composition is important for assessment of organic carbon (OC) burial in marginal seas on regional and global scales. Here we examine the relationships between regional oceanographic conditions (bottom shear stress), and the physical characteristics (mineral surface area and grain size) and geochemical properties (OC content [OC%] and carbon isotope compositions [13C, 14C]) of a large suite of surface sediments from the Chinese marginal seas to assess the influence of hydrodynamic processes on the fate of OM on shallow continental shelves. Our results suggest that 14C content is primarily controlled by organo-mineral interactions and hydrodynamically driven resuspension processes, highlighted by (i) positive correlations between 14C content and OC% (and surface area) and (ii) negative correlations between 14C content and grain size (and bottom shear stress). Hydrodynamic processes influence 14C content due to both OC aging during lateral transport and accompanying selective degradation of OM associated with sediment (re) mobilization, these effects being superimposed on the original 14C characteristics of carbon source. Our observations support the hypotheses of Blair and Aller (2012, https://doi.org/10.1146/annurev-marine-120709-142717) and Leithold et al. (2016, https://doi.org/10.1016/j.earscirev.2015.10.011) that hydrodynamically driven sediment translocation results in greater OC 14C depletion in broad, shallow marginal seas common to passive margin settings than on active margins. On a global scale, this may influence the extent to which continental margins act as net carbon sources and sinks. Our findings thus suggest that hydrodynamic processes are important in shaping the nature, dynamics, and magnitude of OC export and burial in passive marginal seas. ©2018. The Authors.
英文关键词	carbon cycle; hydrodynamic processes; marine sediment; organic carbon; passive and active margins; radiocarbon
语种	英语
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129792
作者单位	Geological Institute, ETH Zurich, Zurich, Switzerland; Now at Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao, China; Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan; Laboratory for Ion Beam Physics, Department of Physics, ETH Zurich, Zurich, Switzerland; Scottish Universities Environmental Research Centre, Glasgow, United Kingdom
推荐引用方式 GB/T 7714	Bao R.,van der Voort T.S.,Zhao M.,et al. Influence of Hydrodynamic Processes on the Fate of Sedimentary Organic Matter on Continental Margins[J],2018,32(9).
APA	Bao R..,van der Voort T.S..,Zhao M..,Guo X..,Montluçon D.B..,...&Eglinton T.I..(2018).Influence of Hydrodynamic Processes on the Fate of Sedimentary Organic Matter on Continental Margins.Global Biogeochemical Cycles,32(9).
MLA	Bao R.,et al."Influence of Hydrodynamic Processes on the Fate of Sedimentary Organic Matter on Continental Margins".Global Biogeochemical Cycles 32.9(2018).