Littérature scientifique sur le sujet « Sinking and sedimented particles »
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Articles de revues sur le sujet "Sinking and sedimented particles"
Honda, M. C., H. Kawakami, S. Watanabe et T. Saino. « Fukushima-derived radiocesium in western North Pacific sediment traps ». Biogeosciences Discussions 10, no 2 (11 février 2013) : 2455–77. http://dx.doi.org/10.5194/bgd-10-2455-2013.
Texte intégralCoppola, Alysha I., Lori A. Ziolkowski, Caroline A. Masiello et Ellen R. M. Druffel. « Aged black carbon in marine sediments and sinking particles ». Geophysical Research Letters 41, no 7 (1 avril 2014) : 2427–33. http://dx.doi.org/10.1002/2013gl059068.
Texte intégralRontani, J. F., B. Charriere, A. Forest, S. Heussner, F. Vaultier, M. Petit, N. Delsaut, L. Fortier et R. Sempéré. « Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) ». Biogeosciences Discussions 9, no 6 (26 juin 2012) : 7743–81. http://dx.doi.org/10.5194/bgd-9-7743-2012.
Texte intégralRontani, J. F., B. Charriere, A. Forest, S. Heussner, F. Vaultier, M. Petit, N. Delsaut, L. Fortier et R. Sempéré. « Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) ». Biogeosciences 9, no 11 (23 novembre 2012) : 4787–802. http://dx.doi.org/10.5194/bg-9-4787-2012.
Texte intégralBoxhammer, T., L. T. Bach, J. Czerny et U. Riebesell. « Technical Note : Sampling and processing of mesocosm sediment trap material for quantitative biogeochemical analysis ». Biogeosciences Discussions 12, no 22 (23 novembre 2015) : 18693–722. http://dx.doi.org/10.5194/bgd-12-18693-2015.
Texte intégralBoxhammer, Tim, Lennart T. Bach, Jan Czerny et Ulf Riebesell. « Technical note : Sampling and processing of mesocosm sediment trap material for quantitative biogeochemical analysis ». Biogeosciences 13, no 9 (13 mai 2016) : 2849–58. http://dx.doi.org/10.5194/bg-13-2849-2016.
Texte intégralBerezina, Anfisa, Evgeniy Yakushev, Oleg Savchuk, Christian Vogelsang et André Staalstrom. « Modelling the Influence from Biota and Organic Matter on the Transport Dynamics of Microplastics in the Water Column and Bottom Sediments in the Oslo Fjord ». Water 13, no 19 (28 septembre 2021) : 2690. http://dx.doi.org/10.3390/w13192690.
Texte intégralGaye-Haake, B., N. Lahajnar, K. Ch Emeis, D. Unger, T. Rixen, A. Suthhof, V. Ramaswamy et al. « Stable nitrogen isotopic ratios of sinking particles and sediments from the northern Indian Ocean ». Marine Chemistry 96, no 3-4 (septembre 2005) : 243–55. http://dx.doi.org/10.1016/j.marchem.2005.02.001.
Texte intégralMirnaghi, Fatemeh, Yujuan Hua, Bruce P. Hollebone et Carl E. Brown. « Evaluation of Oil-Sediment Interactions and the Possibility of Oil Sinking in Marine Environments ». International Oil Spill Conference Proceedings 2017, no 1 (1 mai 2017) : 2017–217. http://dx.doi.org/10.7901/2169-3358-2017.1.2017-217.
Texte intégralOstrovsky, I., et Y. Z. Yacobi. « Organic matter and pigments in surface sediments : possible mechanisms of their horizontal distributions in a stratified lake ». Canadian Journal of Fisheries and Aquatic Sciences 56, no 6 (1 juin 1999) : 1001–10. http://dx.doi.org/10.1139/f99-032.
Texte intégralThèses sur le sujet "Sinking and sedimented particles"
McDonnell, Andrew M. P. « Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates ». Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65326.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references.
The sinking flux of particulate matter into the ocean interior is an oceanographic phenomenon that fuels much of the metabolic demand of the subsurface ocean and affects the distribution of carbon and other elements throughout the biosphere. In this thesis, I use a new suite of observations to study the dynamics of marine particulate matter at the contrasting sites of the subtropical Sargasso Sea near Bermuda and the waters above the continental shelf of the Western Antarctic Peninsula (WAP). An underwater digital camera system was employed to capture images of particles in the water column. The subsequent analysis of these images allowed for the determination of the particle concentration size distribution at high spatial, depth, and temporal resolutions. Drifting sediment traps were also deployed to assess both the bulk particle flux and determine the size distribution of the particle flux via image analysis of particles collected in polyacrylamide gel traps. The size distribution of the particle concentration and flux were then compared to calculate the average sinking velocity as a function of particle size. I found that the average sinking velocities of particles ranged from about 10-200 m d- and exhibited large variability with respect to location, depth, and date. Particles in the Sargasso Sea, which consisted primarily of small heterogeneous marine snow aggregates, sank more slowly than the rapidly sinking krill fecal pellets and diatom aggregates of the WAP. Moreover, the average sinking velocity did not follow a pattern of increasing velocities for the larger particles, a result contrary to what would be predicted from a simple formulation of Stokes' Law. At each location, I derived a best-fit fractal correlation between the flux size distribution and the total carbon flux. The use of this relationship and the computed average sinking velocities enabled the estimation of particle flux from measurements of the particle concentration size distribution. This approach offers greatly improved spatial and temporal resolution when compared to traditional sediment trap methods for measuring the downward flux of particulate matter. Finally, I deployed specialized in situ incubation chambers to assess the respiration rates of microbes attached to sinking particles. I found that at Bermuda, the carbon specific remineralization rate of sinking particulate matter ranged from 0.2 to 1.1 d', while along the WAP, these rates were very slow and below the detection limit of the instruments. The high microbial respiration rates and slow sinking velocities in the Sargasso Sea resulted in the strong attenuation of the flux with respect to depth, whereas the rapid sinking velocities and slow microbial degradation rates of the WAP resulted in nearly constant fluxes with respect to depth.
by Andrew M. P. McDonnell.
Ph.D.
Tilliette, Chloé. « Influence du fer et autres éléments traces issus des sources hydrothermales peu profondes sur la biogéochimie marine dans le Pacifique Sud-Ouest ». Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS046.
Texte intégralThe Western Tropical South Pacific Ocean has been identified as a hotspot for dinitrogen (N2) fixation by diazotrophic organisms, with some of the highest rates recorded in the global ocean. The success of these species relies on non-limiting concentrations of dissolved iron (DFe) in the photic layer of the region, whose origin remains unclear. In this thesis work, the distribution of DFe was studied along a 6100-km transect from Noumea to the gyre waters, crossing the Lau Basin and the Tonga Arc (175°E to 166°W, along 19-21°S). Combined with an optimal multiparametric water mass analysis, DFe anomalies were determined over the transect area, the most notable being present along the Tonga Arc. The results demonstrated that water masses of remote origin entering the Lau Basin could not explain the concentrations observed at the surface in this region, leading to the confident conclusion that DFe originates from shallow hydrothermal sources present along the arc. Although a non-negligeable portion of this DFe input is transported over long distances, a large majority is rapidly removed near the sources through a variety of processes highlighted by a box model. Besides iron, hydrothermal fluids are enriched in numerous other metals that may be toxic to organisms. These fluids, introduced directly into the photic layer, could have an impact on phytoplankton. Their effect was evaluated in an innovative experiment during which natural plankton communities were subjected to an enrichment gradient of hydrothermal fluids. Despite an initial toxic effect of a few days, hydrothermal inputs ultimately induced N2 fixation, productivity and organic matter export rates two to three times higher than those of the non-enriched control. This fertilizing effect probably results from the detoxification of the environment, rich in numerous potentially toxic elements, by resistant ecotypes able to produce strong ligands, such as thiols, limiting the bioavailability of certain metals. The additional supply of fertilizing elements by the fluids, in particular DFe, thus allowed the subsequent growth of the most sensitive species. These experimental results, faithfully reproducing the in-situ observations, confirm the involvement of shallow hydrothermal fluids in the high productivity observed in the region. Hydrothermal sources could be traced at different spatial and temporal scales through the deployment of drifting (for a few days, along the Tonga Arc) and fixed (for a year, along the Lau Ridge) sediment traps and through the coring of seafloor sediments at the trap deployment sites (geological time scale). Al-Fe-Mn tracing revealed that the lithogenic material exported at small and large spatial scales in the region originated from shallow and/or deep hydrothermal sources located along the Tonga Arc. This hydrothermal signature has also been detected in the seafloor sediments, particularly in the vicinity of the Lau Ridge where the presence of a major active source is strongly suspected. Finally, the similar patterns observed for the export of biological and hydrothermal particles suggest that surface production is closely linked to hydrothermal inputs into the photic layer. In conclusion, this thesis work has demonstrated the influence of shallow hydrothermal sources on the fate of trace elements, particularly iron, in the water column and seafloor sediments, and their link to biological productivity in the Western Tropical South Pacific region
Duret, Manon. « Microbial communities in sinking and suspended particles and their influence on the oceanic biological carbon pump ». Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/427041/.
Texte intégralDowns, Janet Newton. « Implications of the phaeopigment, carbon and nitrogen content of sinking particles for the origin of export production / ». Thesis, Connect to this title online ; UW restricted, 1989. http://hdl.handle.net/1773/10984.
Texte intégralTraill, CD. « Lithogenic particle flux to the subantarctic Southern Ocean : a multi-tracer estimate using sediment trap samples ». Thesis, 2021. https://eprints.utas.edu.au/38433/1/Traill_whole_thesis.pdf.
Texte intégralHu, Po-Kai, et 胡博凱. « Comparison of POC/Th-234 in sinking particles and suspended particles ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82622233158935392804.
Texte intégral國立臺灣海洋大學
海洋環境化學與生態研究所
99
234Th/238U has been increasingly used as a tracer to estimate particulate organic carbon(POC)fluxes by calculating product of the POC/234Th ratio of sinking particles and the 234Th flux. Large(>50 m)pump-collected particles are assumed to be representative of sinking particles. Hung and Gong(2010)in the Northwestern Pacific found that small(<50 m)sinking particles(collected by sediment traps)dominated the bulk POC flux, but they did not simultaneously measure the contents of POC and Th-234 in both trap- and in situ pump-collected particles. Here we present POC and 234Th data from the N Pacific for two particle size classes(1-50 and 50-355 m)from both trap- and pump-collected particles in the northwestern Pacific using three methods:trap-collected particles with gravity filtration(PGF), trap-collected particles with natural filtration(PNF), and pump-collected particles with sequential filtration(PSF). POC in small(<50 µm)particles using PGF, PNF and PSF accounted for 34-78%, 30-75% and 88-98%, respectively. Th-234 in small(<50 µm)particles using PGF, PNF and PSF showed a similar range, i.e., it accounted for 44-89%, 11-75% and 43-98%, respectively. These results clearly show that pump-collected large and small particles are not only different from trap-collected particles in terms of POC and Th-234 concentrations, but also POC and Th-234 contents in small(pump-collected)particles are significantly larger than large(pump-collected)particles.These results suggest that the contribution of particles smaller than 50 m to the settling flux is larger than previously thought. Thus, POC/234Th ratios conventionally derived from large pump-collected particles may not be appropriate for esti-mating POC flux. Instead, we suggest that POC/234Th ratios in sinking particles should be used for estimating POC flux.
Chien, Ying-Hsueh, et 錢映學. « Size distribution of sinking particles in different marine environments ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/24357433465420358917.
Texte intégral國立中山大學
海洋地質及化學研究所
101
234Th/238U has been used to estimate particulate organic carbon (POC) export fluxes, based on the POC/234Th ratio of sinking particles and the 234Th flux, in the ocean. However, the 234Th-derived POC flux may be significantly biased due to the variation of use POC/234Th ratios from large particles (>50μm). More recently, some studies use particle size distributions in the upper ocean to calculate POC flux. Although Hung and Gong (2010) and Hung et al. (2012) have measured the size distributions in sinking particle, but their experiments were limited in some regions. Therefore, the size distributions in sinking particle are not clearly. In this study, we collected sinking particles with three different instruments (Laser in-situ Scattering and Transmissometry (LISST-100X), cylindrical and conical sediment traps) from the northern South China Sea, the upwelling region off the northeast Taiwan (where diatoms are the most dominant group) and the Northwestern Pacific (where picoplanktondominated), measured POC and 234Th data for various particle size classes (1-50 μm, 50-330 μm and >330 μm, (herein we defined that < 50μm is the “ small particle”). The results show the small particles, investigated by-cylindrical and conical traps, contained the largest proportion of POC (46~66%, by cylindrical traps) and (37~75%, by conical traps) and the distribution of particle size measured by LISST-100X howed small particles had the elevated shares of total particle volume. SEM images of bulk (without sequential filtration) sinking particles also evidence that sinking particles contained many small particles. Besides, the model-derived POC flux in small particles using particle size distribution is quite comparable with the measured POC flux by sediment trap, while the POC fluxes measured by both methods show pronounced difference suggesting that it is worthy for studying in the future. Overall, our results suggest that the contribution of particles smaller than 50 μm to the sinking POC flux can be a major fraction of the total sinking flux, and thus, particles smaller than 50 μm cannot be ignored when using Th-234/U-238 disequilibrium to estimate POC flux in the water column.
Hvitfeldt, Iversen Morten [Verfasser]. « Carbon turnover in sinking particles in the marine environment / vorgelegt von Morten Hvitfeldt Iversen ». 2009. http://d-nb.info/995315612/34.
Texte intégralEbersbach, Friederike [Verfasser]. « Flux and modification of sinking particles : three field studies in the Southern Ocean / Friederike Ebersbach ». 2010. http://d-nb.info/1011096714/34.
Texte intégralChapitres de livres sur le sujet "Sinking and sedimented particles"
Knauer, George. « The Analytical Determination of Mass Flux, Inorganic and Organic Carbon and Nitrogen Flux in Rapidly Sinking Particles Collected in Sediment Traps ». Dans Marine Particles : Analysis and Characterization, 79–82. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm063p0079.
Texte intégralHolmes, M. E., G. Lavik, G. Fischer et G. Wefer. « Nitrogen Isotopes in Sinking Particles and Surface Sediments in the Central and Southern Atlantic ». Dans The South Atlantic in the Late Quaternary, 143–65. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-18917-3_8.
Texte intégralHolmes, M. E., C. Eichner, U. Struck et G. Wefer. « Reconstruction of Surface Ocean Nitrate Utilization Using Stable Nitrogen Isotopes in Sinking Particles and Sediments ». Dans Use of Proxies in Paleoceanography, 447–68. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58646-0_18.
Texte intégralDavis, Bruce, et Keyna O'Reilly. « Electron Probe Micro Analysis of Sedimented Zirconium Particles in Magnesium ». Dans Magnesium, 242–47. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527603565.ch37.
Texte intégralBodungen, Bodo V., Marita Wunsch et Heike Fürderer. « Sampling and Analysis of Suspended and Sinking Particles in the Northern North Atlantic ». Dans Marine Particles : Analysis and Characterization, 47–56. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm063p0047.
Texte intégralHayakawa, Kazuhide, et Nobuhiko Handa. « Fatty Acid Composition of Sinking Particles in the Western North Pacific ». Dans Dynamics and Characterization of Marine Organic Matter, 105–15. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1319-1_5.
Texte intégralIshiwatari, R., K. Yamada, K. Matsumoto, H. Naraoka, S. Yamamoto et N. Handa. « Source of Organic Matter in Sinking Particles in the Japan Trench : Molecular Composition and Carbon Isotopic Analyses ». Dans Dynamics and Characterization of Marine Organic Matter, 141–68. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1319-1_7.
Texte intégralNakatsuka, Takeshi, Ayako Hosokawa, Nobuhiko Handa, Eiji Matsumoto et Toshiyuki Masuzawa. « 14C Budget of Sinking Particulate Organic Matter in the Japan Trench : A New Approach to Estimate the Contribution from Resuspended Particles in Deep Water Column ». Dans Dynamics and Characterization of Marine Organic Matter, 169–86. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1319-1_8.
Texte intégralSmith, George E., et Raghav Seth. « The Historical Background : Brownian Motion as of 1905 ». Dans Brownian Motion and Molecular Reality, 88–128. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190098025.003.0003.
Texte intégralAdams, R., et R. Thompson. « Are the Sinking Velocities of Microplastics Altered Following Interactions With Austrominius modestus and Sediment Particles ? » Dans Fate and Impact of Microplastics in Marine Ecosystems, 99–100. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-812271-6.00097-1.
Texte intégralActes de conférences sur le sujet "Sinking and sedimented particles"
Raven, Morgan, Samuel Webb et Richard Keil. « Sulfidic Conditions Transform Sinking Marine Particles ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7887.
Texte intégralEvans, Natalya, James Moffett, Daniele Bianchi et Gregory Cutter. « Identifying the primary oxidation processes for particulate sulfide using mechanistic models of reducing microenvironments in large, sinking particles ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.4963.
Texte intégralChoi, Hyuntae, Eun Jin Yang, Sung-Ho Kang et Kyung-Hoon Shin. « Seasonal Nitrogen Baseline (δ15N) Variation of Sinking Particles in the Western Arctic Revealed by Compound-Specific Isotope Analysis of Amino Acids ». Dans Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.428.
Texte intégralNabian, Mohammad Amin, et Leila Farhadi. « Numerical Simulation of Solitary Wave Using the Fully Lagrangian Method of Moving Particle Semi Implicit ». Dans ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22237.
Texte intégralXu, Yuanqi, Jiasong Fang, Jiangyan LI et Jiahua Wang. « Hydrostatic pressure Exerts Different Effects on Community Structure and Metabolic Capacities of Marine Particle-Attached and Free-Living Microorganisms in Decomposition of the Sinking Particles ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7377.
Texte intégralNorth, Mark T., et Wei-Lin Cho. « High Heat Flux Liquid-Cooled Porous Metal Heat Sink ». Dans ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35320.
Texte intégralRenger, Stefan. « Investigation of the Agglomeration and the Break-Up of Isolation Material ». Dans 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75391.
Texte intégralTalapatra, Siddharth, Jiarong Hong, Jian Sheng, Becky Waggett, Pat Tester et Joseph Katz. « A Study of Grazing Behavior of Copepods Using Digital Holographic Cinematography ». Dans ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55196.
Texte intégralHuang, Luofeng, Seogeng Riyadi, I. Ketut Aria Pria Utama et Giles Thomas. « Computational Study on the Transmission of COVID-19 Virus Inside a Ship ». Dans ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-80182.
Texte intégralBartolini, Lorenzo, Lorenzo Marchionni, Antonio Parrella et Luigino Vitali. « Advanced FE Modelling Approach for Pipeline Hooking Interaction of Dragged Anchors ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77473.
Texte intégralRapports d'organisations sur le sujet "Sinking and sedimented particles"
Siegel, David A., Ivona Cetinic, Andrew F. Thompson, Norman B. Nelson, Michaela Sten, Melissa Omand, Shawnee Traylor et al. EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) North Atlantic sensor calibration and intercalibration documents. NASA STI Program and Woods Hole Oceanographic Institution, octobre 2023. http://dx.doi.org/10.1575/1912/66998.
Texte intégral