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 338 for “"Eddies"”.
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Mixing by ocean eddies
Mesoscale eddies mix and transport tracers such as heat and potential vorticity laterally in the ocean. While this transport plays an important role in the climate system, especially in the Southern Ocean, we lack a, comprehensive understanding of what sets mixing rates. This thesis seeks to …
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Cyclonic Eddies in the Cape Basin
… Basin consists of bothcyclonic and anticyclonic eddies. These eddies interact with each other, resulting inthe vigorous stirring of these water mass. Investigations have shown that the cycloniceddies tend to be smaller and outnumber the anticyclonic rings. Nonetheless, verylittle is known of …
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The role of eddies in buoyancy flux
This thesis explores the role of eddies in determining the stratification of the ocean through a laboratory experiment. The experiment uses a dual-tank apparatus, with a smaller tank sitting inside the larger tank. Both tanks sit on a rotating turntable, which simulates the rotation of Earth. …
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The effects of ocean eddies on tropical cyclones
… the interactions of tropical cyclones with ocean eddies. In particular we examine the influence of a cold-core eddy on the cold wake formed during the passage of Typhoon Fanapi (2010). The three-dimensional version of the numerical Price–Weller–Pinkel (PWP) vertical mixing model has previously …
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Properties of Conditional Eddies in Free Shear Flows
Large structures in two types of free turbulent flows, namely, grid turbulence and two-stream, plane mixing flow, have been investigated through studies of conditional averages. The conditional averages of interest were expected values of the instantaneous velocity and the second-order velocity …
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The effects of ocean eddies on tropical cyclones
… the interactions of tropical cyclones with ocean eddies. In particular we examine the influence of a cold-core eddy on the cold wake formed during the passage of Typhoon Fanapi (2010). The three-dimensional version of the numerical Price-Weller-Pinkel (PWP) vertical mixing model has previously …
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Submesoscale eddies and their potential for buoyant microplastic accumulation
Eddies are ubiquitous throughout the world oceans, and represent a mechanism for transport and re-distribution of particles such as microplastics trapped within. While much research is devoted to plastic distribution at the ocean surface and near-surface, very little is known about their subsurface …
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The Mozambique Channel eddies : characteristics and mechanisms of formation
… have shown a number of cyclonic and anticyclonic eddies being generated within the Mozambique Channel. The eddies were identified using a newly designed eddy detection algorithm. The algorithm has shown that cyclonic eddies appeared to be more ubiquitous than the anticyclonic and had a single mode …
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Time-lapse Acoustic Imaging of Oceanic Fronts and Eddies
… across the west Antarctic shelf where warm-core eddies are reported. Processed and calibrated seismic images reveal the detailed thermohaline structure of Circumpolar Deep Water. Many warm-core eddies are observed, which have diameters of 1--12~km and thicknesses of 100--200~m. Pre-stack analysis …
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Modeling Mesoscale Eddies: the Effects of Resolution onOcean Turbulence
… resolution required to represent mesoscale eddies in the primitive equations. Convergence is evaluated through several metrics, including surface and depth-integrated kinetic energy, spectra, and zonally-averaged temperature, in order to establish quantitative resolution thresholds for …
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Influence of topography on the dynamics of baroclinic oceanic eddies
In this work we study motion of a baroclinic upper-ocean eddy over a large-scale topography which simulates a continental slope. We use a quasigeostrophic f-plane approximation with continuous stratification. To study this problem we develop a new numerical technique which we call "semi-lagrangian …
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Generation of mid-ocean eddies : the local baroclinic instability hypothesis
… as a generation mechanism for midocean mesoscale eddies is examined with a two-layer, quasi-geostrophic (QG) model forced by an imposed, horizontally homogeneous, vertically sheared mean flow and dissipated through bottom Ekman friction, Explanations are sought for two observed features of …
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Influence of Tides and Mesoscale Eddies in the Ross Sea
… is to investigate how tides and mesoscale eddies affect the pathways of dFe to the surface ocean.</p> <p>A regional ocean model with four hindcast simulations are used. Tidal forcing is added to simulations and mesoscale eddies are resolved by changing the horizontal grid resolution from 5 …
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Influence of topography on the dynamics of baroclinic oceanic eddies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Generation of mid-ocean eddies : the local baroclinic instability hypothesis
Thesis (Ph.D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and the Woods Hole Oceanographic Institution), 2000.
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Representation of eddies in climate models by a potential vorticity flux
… the transport characteristics of these eddies is fundamental to understanding their effect on the large-scale ocean circulation and global climate. The approach is to transform the primitive equations to yield the altered 'transformed Eulerian mean' (TEM) equations. The assumption is …
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Eddies and friction : removal of vorticity from the wind-driven gyre
… is much wider than the frictional region because eddies flux vorticity from within the interior streamlines to the frictional region for removal. Using boundary-enhanced viscosity, western-intensified calculations are possible with lower interior viscosity than in previous studies. Interesting …
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The role of large-scale atmospheric eddies in the climate equilibrium
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Representation of eddies in climate models by a potential vorticity flux
… the transport characteristics of these eddies is fundamental to understanding their effect on the large-scale ocean circulation and global climate. The approach is to transform the primitive equations to yield the altered 'transformed Eulerian mean' (TEM) equations. The assumption is …
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