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 20 of 26 for “"Ocean processes"”.
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Sea Ice Cover Deformation on the Local Scale and Mesoscale and Its Relationship to Atmosphere-Ocean Processes
… study of sea ice cover deformation caused by the processes in the atmosphere and ocean. Only a modest number of studies has addressed the cross-scale analysis of the ice deformation. The aim of the present research has two foci: to investigate the variability of ice deformations and identify …
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The Influence of Sea-Level Rise on Salinity in the Lower St. Johns River and the Associated Physics
… that remain active from the Atlantic Ocean through to the upstream end of Lake George (river km 200). Salinity in the lower St Johns River is spatially and temporally variable, whereby the salinity distribution is driven primarily by the combination of ocean processes of tides and …
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Single mode excitation in the shallow water acoustic channel using feedback control
… propagation in a discrete set of modes. Ocean experiments have confirmed the modal nature of acoustic propagation, but no experiment has successfully excited only one of the suite of mid-frequency propagating modes propagating in a coastal environment. The ability to excite a single mode …
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The influence the oceanographic variability has on the top predators of the sub-Antarctic domain
Historically, a lack of small-scale physical oceanographic (hours to days, 1-10 km) and behavioural (<10 sec, ~1 m) observations in the relatively inaccessible Southern Ocean has led to poor quantification of marine mammal foraging behaviour and the physical upper ocean processes that may influence …
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Marine Science Lesson Plans about the Pacific Marine National Monuments: Options for Enhancing Ocean Literacy in the 7th through 12th Grade Classroom
The ocean is one of the Earth's defining features; it provides our world with variety of beneficial services like regulating climate, providing food, and is a source of wonder and inspiration. However, despite its size and powerful nature it is not immune to degradation. One of the greatest risks …
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High-order Discontinuous Galerkin Methods and Deep Reinforcement Learning with Application to Multiscale Ocean Modeling
… an increasingly pivotal role in the field of oceanography, enabling scientists to explore and understand ocean processes which are otherwise inaccessible or challenging to observe directly. It provides a crucial tool for investigating a range of phenomena from large-scale circulation patterns …
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Investigating the atmospheric and oceanic drivers of Atlantic Multidecadal Variability and predictability
… the Earth system, the relative importance of ocean and atmospheric dynamics in generating Atlantic Multidecadal Variability (AMV) remains an open question. This thesis presents three pathways to understanding how oceanic and atmospheric processes generate key spatio-temporal signatures of AMV …
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Investigating the Atmospheric and Oceanic Drivers of Atlantic Multidecadal Variability and Predictability
… the Earth system, the relative importance of ocean and atmospheric dynamics in generating Atlantic Multidecadal Variability (AMV) remains an open question. This thesis presents three pathways to understanding how oceanic and atmospheric processes generate key spatio-temporal signatures of AMV …
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Wind-driven circulation on a shallow, stratified shelf
Data from the Coastal Ocean Processes Inner Shelf Study are analyzed to determine atmospheric forcing characteristics and the heat balance of the inner shelf, and are used as motivation for a numerical study of inner shelf circulation during upwelling and downwelling. Variation in meteorological …
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Spectral feature classification of oceanographic processes using an autonomous underwater vehicle
… develops and demonstrates methods of classifying ocean processes using an underwater moving platform such as an Autonomous Underwater Vehicle (AUV). The "mingled spectrum principle" is established which concisely relates observations from a moving platform to the frequency-wavenumber spectrum of …
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Underwater acoustic communication over Doppler spread channels
… time-variant FIR filter. The impact of physical ocean processes on the Doppler spread is demonstrated, and from this modeling explanations for the Doppler spread observed in real data are obtained. A decision feedback equalizer (DFE) adapted with recursive least squares (RLS) is analyzed, and its …
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Physical controls on copepod aggregations in the Gulf of Maine
… endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at how different characteristics of the GOM circulation fit into these two categories. The first part of the thesis investigates a hypothetical …
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Where the Ice Ends: Calving and Ice-Ocean Interactions at Helheim Glacier and Beyond
… iceberg calving, the detachment of ice into the ocean. Ice dynamic and ice-ocean processes that influence iceberg calving occur across a range of spatial (cm to km) and temporal (minutes to years) scales, making them difficult to capture with existing observational strategies. To quantify these …
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Spectral feature classification of oceanographic processes using an autonomous underwater vehicle
… develops and demonstrates methods of classifying ocean processes using an underwater moving platform such as an Autonomous Underwater Vehicle (AUV). The "mingled spectrum principle" is established which concisely relates observations from a moving platform to the frequency-wavenumber spectrum of …
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Physical controls on copepod aggregations in the Gulf of Maine
… endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at how different characteristics of the GOM circulation fit into these two categories. The first part of the thesis investigates a hypothetical …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary 231Pa/230Th
Radioactive isotopes can be used in paleoceanography both for dating samples and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean’s role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a …
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Marine thorium and protactinium distributions: Tools for past and present chemical flux
… bioactive and contaminant trace metals in the ocean. Scavenging is also involved in the cycling of other trace metals used in ocean sediments to learn about ocean processes, such as circulation rates or biological productivity, of the geologic past. This dissertation is an oceanographic …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary ²³¹Pa/²³⁰Th
Radioactive isotopes can be used in paleoceanography both for dating samples and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean's role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a …
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Design sea levels for Southern Africa : a probabilistic approach
… objective it was necessary to establish which ocean processes affected sea level in the sub-continent and develop a probabilistic model for the combination thereof. The methodology, is used to characterize regional design sea levels in terms of the west, south and east coasts. A site specific …
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Directional wavenumber characteristics of short sea waves
Interest in short waves on the ocean surface has been growing over the last three decades because they play an important role in surface electromagnetic (e.m.) scattering. Currently radars and scatterometers which use e.m. scattering to remotely examine the ocean can produce estimates of the …
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