scholarly journals FeaturedL&O E-Lecture: An Introduction to Marine Sediments with an Emphasis on Sediment Organic Matter Remineralization

2016 ◽  
Author(s):  
David J. Burdige
Keyword(s):  
Organic Matter ◽  
Marine Sediments ◽  
Sediment Organic Matter

A novel approach to quantifying resuspension resistance of sediment organic matter against coastal flow

2020 ◽  
Author(s):  
Naiyu Zhang ◽  
Charlotte Thompson ◽  
Ian Townend
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Marine Sediments ◽  
Microcomputed Tomography ◽  
Sediment Organic Matter ◽  
Flow Conditions ◽  
X Ray ◽  
Continental Shelves ◽  
Sediment Organic Carbon ◽  
Organo Clay

<p>In order to estimate sediment organic carbon budget in coastal oceans and continental shelves, a first step is to estimate how much of the deposited organic matter is retained within a sediment matrix, for further remineralization and preservation on a geological timescale, rather being physically flushed away by benthic flow<sup>1</sup>. This question becomes more challenging for the regions where ‘mobile’ layers (e.g. fluff layer, fluid mud and nepheloid layer) are formed due to the massive organic matter inputs, and often frequent resuspension and deposition<sup>2</sup>. Organic matter remineralization and preservation in sediments has been mostly investigated but often overlooks the role of flow-induced shear stresses on suspending the organic matter. While such flow influences in sediment organic matter budget may have little influence on sediment organic matter budget in deep oceans, it cannot be neglected in shallow-water coastal seas and continental shelves where cyclic resuspension, deposition and frequent storm events occur<sup>3,4</sup>. To our knowledge, the resistance strengths of organic matter in sediments against flow resuspension has received little attention.</p><p>To investigate this knowledge gap, various organo-clay aggregates and organo-clay-sand aggregates formed under different flow conditions were investigated by a series of laboratory flume<sup>5</sup> and high resolution X-ray Microcomputed Tomography (micro-CT) experiments<sup>6</sup>. Herein, a novel methodology is proposed, which successfully establishes quantitative relationships between the resuspension resistance strengths of these organic aggregates and a wide range of flow intensities, from moderate to storm conditions. The results provide a basis for computing resuspension under a range of flow conditions and, hence improving estimates of the organic matter budget in the coastal zone.  </p><p> </p><p><strong>References</strong></p><ol><li>Burdige, D. J. Preservation of organic matter in marine sediments: Controls, mechanisms, and an imbalance in sediment organic carbon budgets? Chem. Rev. <strong>107</strong>, 467–485 (2007).</li> <li>McKee, B. A., Aller, R. C., Allison, M. A., Bianchi, T. S. & Kineke, G. C. Transport and transformation of dissolved and particulate materials on continental margins influenced by major rivers: Benthic boundary layer and seabed processes. Cont. Shelf Res. (2004). doi:10.1016/j.csr.2004.02.009</li> <li>Burdige, D. J. Burial of terrestrial organic matter in marine sediments: A re-assessment. Global Biogeochem. Cycles <strong>19</strong>, 1–7 (2005).</li> <li>Nicholls, R. J. & Cazenave, A. Sea-level rise and its impact on coastal zones. Science (2010). doi:10.1126/science.1185782</li> <li>Thompson, C. E. L., Couceiro, F., Fones, G. R. & Amos, C. L. Shipboard measurements of sediment stability using a small annular flume-core mini flume (cmf). Limnol. Oceanogr. Methods (2013). doi:10.4319/lom.2013.11.604</li> <li>Zhang, N. et al. Nondestructive 3D Imaging and Quantification of Hydrated Biofilm-Sediment Aggregates Using X-ray Microcomputed Tomography. Environ. Sci. Technol. <strong>52</strong>, 13306–13313 (2018).</li> </ol>

Erratum to ‘Control of sulphate and methane distributions in marine sediments by organic matter reactivity’ [Geochimica et Cosmochimica 104 (2013) 183–193]

2013 ◽  
Vol 113 ◽  
pp. 225-226 ◽  
Author(s):  
Patrick Meister ◽  
Bo Liu ◽  
Timothy G. Ferdelman ◽  
Bo Barker Jørgensen ◽  
Arzhang Khalili
Keyword(s):  
Organic Matter ◽  
Marine Sediments

scholarly journals Adsorption of tetracyclines on marine sediment during organic matter diagenesis

2013 ◽  
Vol 67 (11) ◽  
pp. 2616-2621 ◽  
Author(s):  
Ying-Heng Fei ◽  
Xiao-Yan Li
Keyword(s):  
Experimental Study ◽  
Organic Matter ◽  
Marine Sediment ◽  
Dynamic Process ◽  
Emerging Pollutants ◽  
Experimental Results ◽  
Sediment Organic Matter ◽  
Artificial Sediment ◽  
Adsorption Sites ◽  
Organic Products

The effect of decomposition and diagenesis of sediment organic matter (SOM) on the adsorption of emerging pollutants by the sediment has been seldom addressed. In the present experimental study, artificial sediment was incubated to simulate the natural organic diagenesis process and hence investigate the influence of organic diagenesis on the adsorption of tetracyclines (TCs) by marine sediment. During a period of 4 months of incubation, SOM initially added into the sediment underwent biodegradation and diagenesis. The results showed an early decrease in TC adsorption by the sediment, which was likely caused by the competition between the microbial organic products and TC molecules for the adsorption sites. Afterward, TC adsorption by the sediment increased significantly, which was mainly due to the accumulation of condensed SOM. The experimental results indicate the interactions between TCs and the sediment during the dynamic process of SOM diagenesis. Moreover, the remaining SOM is shown to have an increasing affinity with the antibiotics.

Divergent roles of iron and aluminum in sediment organic matter association at the terrestrial–aquatic interface

2022 ◽  
Author(s):  
Kai Nils Nitzsche ◽  
Zachary E. Kayler ◽  
Katrin Premke ◽  
Arthur Gessler ◽  
Rota Wagai
Keyword(s):  
Organic Matter ◽  
Sediment Organic Matter
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