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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 20 of 38 for “"Shelf waters"”.
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Shore-parallel sediment transport by waves and tides in inner shelf waters
In shallow waters the combined action of waves and currents significantly affects the motion of sediment on the bottom, and hence the nature and phase of their interactions with each other contribute to the shaping of the beach. Using pressure and velocity data collected just outside the surfzone …
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Remote sensing of submerged objects and geomorphology in continental shelf waters with acoustic waveguide scattering
… and sub-seafloor geomorphology in continental shelf waters using an active sonar system is explored experimentally and theoretically. A unified model for 3-D object scattering and reverberation that takes into account the coupling between propagation and scattering in a stratified medium is …
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A Comparison of Recruitment Strategies Among Brachyuran Crustacean Megalopae of the York River, Lower Chesapeake Bay and Adjacent Shelf Waters
… River, lower Chesapeake Bay and adjacent coastal waters were sampled from July through September 1980. The megalopa stages of 11 brachyuran species were sampled. Vertical and horizontal distributions are described for each species in relation to salinity and water column stratification. The …
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Changes in shelf waters due to air-sea fluxes and their influence on the Arctic Ocean circulation as simulated in the OCCAM global ocean model
… dense water formation. In the model these dense waters are transported by a circumpolar boundary current into the deep convection sites of the North Atlantic Ocean. The boundary current is thought to be a continuous feature in the real ocean, however the driving force is still unknown. We provide …
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Estimation of Primary Production and Carbon Flux in Antarctic Coastal Waters: A Modeling Study
… the fate of phytoplankton carbon in continental shelf waters of the west Antarctic Peninsula (WAP) and Ross Sea. Simulation of the underwater light field required derivation of new coefficient sets for power function-type cloud cover correction algorithms, which were found to be influenced by …
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Forced synoptic coastal-trapped waves along the southern African coastline
… in sea levels and currents over the continental shelf surrounding southern Africa is well-documented, however presently available observational data alone are largely ~nsuitable or insufficient to adequately characterise the shelf circulation in terms of coastal-trapped wave (CTW) theory. In this …
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Seasonal and Mesoscale Variability in the Distribution of Antarctic Krill, <i>Euphausia superba</i>, West of the Antarctic Peninsula
… krill, Euphausia superba, within continental shelf waters west of the Antarctic Peninsula and to investigate possible relationships between variability in krill distributions and variability in selected environmental parameters. Acoustic measurements of krill were made each season at …
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Influence of Physics on the Distribution of Ichthyoplankton Across the Chesapeake Bay Plume
… are major contributors in the regulation of shelf-spawned estuarine-dependent taxa.</p> <p>This study examined how physical oceanographic features affected the spatial distribution of ichthyoplankton across the Chesapeake Bay Plume. Larval surveys were conducted across the shelf and within …
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Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system
… which is a known occurrence in the Namibian shelf waters. New variables, nitrite and nitrous oxide production, are added in BFM to complete the nitrogen cycle. The nitrification process in BFM is also formulated in two stages as in BioEBUS to obtain comparative results in both models. Both …
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Determination of Dissolved Iron Speciation in the North East Atlantic Ocean by Flow Injection Chemiluminescence
… on iron redox speciation measurements in natural waters. The method was also used to determine the distribution of dissolved iron species (< 0.2 µm) in two contrasting study areas in the North East Atlantic Ocean and for a study of aerosol iron dissolution in seawater. The FI-CL method was …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… of the optical variability observed in natural waters, because of the presence of seawater constituents that do not covary with phytoplankton pigment concentration. In an attempt to better understand variability in these models, the contributions of seawater constituents to ocean optical …
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UNDERSTANDING THE PHYSICAL OCEANOGRAPHY OF THE MISSISSIPPI SOUND: OBSERVATIONAL CLIMATOLOGIES, TRENDS AND RELATIONSHIPS IN THE SOUND AND COMPARISON OF THE SURFACE CURRENTS OF OCEAN MODELS WITH HIGH FREQUENCY RADAR DATA
… Gulf of Mexico (NGOM) separated from the shelf waters by a series of barrier islands. It is mostly characterized by its strong weather fronts, storms and hurricanes that affect the hydro-morpho-dynamics of the region. This includes strong impact on the current circulation, flow pattern, …
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Contribuição à taxonomia do gênero Psammobatis Günther, 1870 (Chondrichthyes, Rajidae): caracterização das espécies do subgrupo I de McEachran (1983) com base em padrões de coloração e espinulação
… the distribution of which is restricted to shelf waters off the southern coasts of Argentina and Chile, the latter in the eastern South Pacifíc. Misidentifications among species of subgroup I are frequent, particularly between individuals of P. extenta and P. rutrum. These two species are …
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The influence of the land-sea breeze on coastal upwelling systems
… land-sea breeze drives a net warming of inner shelf waters primarily due to enhanced retention of the deepened surface mixed layer. The deepened thermocline impacts geostrophically-driven alongshore currents within St Helena Bay, which are strengthened (weakened) during upwelling (relaxation) …
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The Winds of Change: The effects of katabatic winds on fjord circulation, sea-ice export and glacier stability at Sermilik Fjord and Helheim Glacier
… positioned across the fjord and adjacent shelf waters, showed the expected warm water influxes are lower in scale in comparison to intermediary circulation associated with barrier winds. However, submarine melt rates at the top of the fjord can increase during downslope wind events by up …
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The atmospheric boundary layer above the Agulhas current
… of the warm Agulhas Current and cool shelf waters is shown to have far-reaching effects on the overlying atmosphere. Air-sea fluxes of momentum, sensible and latent heat and resultant boundary layer characteristics demonstrate high horizontal inhomogeneity. The results suggest that …
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Simulation of variability in the tropical Western Indian Ocean
… circulation and properties in the Tanzanian shelf region in the tropical western Indian Ocean have been studied in this thesis using a regional ocean model. The study investigated the influences of the Northeast Madagascar Current (NEMC) in the Tanzanian shelf waters at the annual cycle. …
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The development and decline of phytoplankton blooms in the southern Benguela upwelling region
… and new nutrients (entrained into surface waters after the primary bloom), maintain primary production in shelf waters at moderate levels than the 6-8 days suggested by this study.
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Cross-frontal exchange at the US Northeast shelfbreak
Exchange across the semipermeable US Northeast shelfbreak front is a potential driver of irreversible change to the continental shelf waters, its productive ecosystem, and economically valuable fisheries. However, cross-frontal exchange is difficult to observe directly because it is highly …
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