Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"marine snow"”.
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Marine snow tracking stereo imaging system
… mid-ocean. By recording time-lapsed images of marine snow falling through the imaging volume over day-to- week timescales, we can estimate both the particle size distributions and, via 3D particle tracking velocimetry, their velocity distributions too. This allows us to directly estimate the …
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Accelerated settling of particulate matter by ’marine snow’ aggregates
… provide strong evidence for rapid settling of marine particles by aggregates. Particle water column residence times were determined by measuring the time lag between the interception of a flux event in a shallow trap and the interception of the same event in a deeper trap at the same site. …
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Accelerated settling of particulate matter by 'marine snow' aggregates
Thesis: Ph. D., Woods Hole Oceanographic Institution, 1986
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The Effects of Vertical Diel Thermocline Movement on the Settling of Marine Snow in a River Influenced Marine Environment
… and cooling cycles in the upper water column in marine snow settling processes, particle distribution data from 15 marine snow camera casts were analyzed to examine variations in aggregate abundance, ellipsoidal volume, and particle elongation with depth. Data were collected during two cruises …
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Marine Snow Settling Velocities at an Oil Spill Site and a Control Site in the Northern Gulf of Mexico
… to observations of large and numerous oiled marine snow aggregates amidst the surface slick proposed that a large quantity of oil sank to depth via the aggregates. Having reached the seafloor, aggregates were subject to microbial degradation and to redistribution due to bottom currents. To …
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Relationship of plankton and marine snow to hydrography and currents on the southwest portion of Georges Bank during June 1997
A key question in biological oceanography is how plankton populations maintain themselves in regions of favorable growth and survival in the face of horizontal transport by ocean currents. Plankton are thought to be retained on the highly productive Georges Bank by the clockwise flow, which …
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Relationship of plankton and marine snow to hydrography and currents on the south portion of Georges Bank during June 1997
A key question in biological oceanography is how plankton populations maintain themselves in regions of favorable growth and survival in the face of horizontal transport by ocean currents. Plankton are thought to be retained on the highly productive Georges Bank by the clockwise flow, which …
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Investigating Diel Periodicity in Export Flux in the Gulf of Mexico Using a Particulate Imaging System
… in the biological pump, a floating array with a marine snow camera system at 150 m depth was used, and particles were imaged at a 40 second interval for a 24 to 30 hour period at five sites in the Gulf of Mexico in June 2017. Each image was processed to identify and size all the particles within …
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Investigations into Ultra-Low-Power Underwater Imaging
… is crucial to advancing our understanding of marine organisms, climate change, marine geology, aquaculture farming, and underwater archaeology. Despite significant advances in underwater imaging, scalable and longterm imaging of underwater environments is still an open problem. One of the main …
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Coagulation between fractal aggregates and small particles and fractal properties of marine particles
… of microscopic particles (300 μm) occurring in marine systems were investigated. A new method, called the particle concentration technique (PCT), was developed to calculate the average fractal dimension of all particles in a certain size range by the analysis of particle size distributions in …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… 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 …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… 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 …
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, sources and cycling
… phytoplankton are indeed a source of APS to the marine environment. Furthermore, the degradation of the T. weissflogii exudate by a natural assemblage of microorganisms indicates that the component resembling APS is more resistant to microbial degradation compared to other polysaccharides present …
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, dources and cycling
… phytoplankton are indeed a source of APS to the marine environment. Furthermore, the degradation of the T. weissflogii exudate by a natural assemblage of microorganisms indicates that the component resembling APS is more resistant to microbial degradation compared to other polysaccharides present …
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The role of microbial populations in the cycling of iron and manganese from marine aggregates
Marine aggregates play an important role in the cycling of carbon, nutrients and trace<br/>metals. Within aggregates the oxygen depleted by aerobic microbial respiration may<br/>not be replaced rapidly, generating anoxic or suboxic microzones. Reduced<br/>compounds that are unstable in the …