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.
Results
Showing 1 to 20 of 31 for “"eddy kinetic energy"”.
-
GLOBAL TRENDS IN EDDY KINETIC ENERGY FROM SATELLITE ALTIMETRY
The temporal changes in the oceanic eddy kinetic energy (EKE) including trends and variability are presented and the dynamical mechanisms are investigated. The domain is near-global with a focus on the North Atlantic, North Pacific and Southern Oceans. Altimeter-derived geostrophic surface …
-
Space and time scales of low frequency variability in the ocean
… the distribution of low frequency variability energy in horizontal wavenumber, frequency, vertical mode and geography. We assume horizontal isotropy, Φ(K, ω, η, φ, λ) = 2πKψ(k, l, ω, η, φ, λ), with K designating the amplitude of total horizontal wavenumber. The parameters of Φ(K, ω, η, φ, λ) …
-
On the Impact of Submesoscale Fronts on Mesoscale Eddies and Biological Productivity in the California Current System
… for the increased resolution. Further, the energy cascade of mesoscale eddies is better resolved contributing to the seasonal evolution of eddy kinetic energy. Finally, the biological productive band at the coast broadens, presumably driven by enhanced lateral transport of nutrients. The …
-
Modelling wind-driven inter-ocean exchange in the greater Agulhas with the regional ocean modelling system
… retroflections and produce Agulhas rings with eddy kinetic energy patterns consistent with those derived from altimetry. Improved topography in ARC112 yields a retroflection position and leakage value closer to observations. Dominant regional water masses are captured, but discrepancies in …
-
PRINCESS AND THE PEA: THE IMPACT OF ROUGH TOPOGRAPHY ON DYNAMICS OF LARGE-SCALE SURFACE CIRCULATION PATTERNS
… stress. Diagnostics include absolute velocity, eddy kinetic energy (EKE), mean kinetic energy (MKE) and the D-function to quantify shear and energy redistribution. Similarly, this research explores how subtle roughness at the ocean floor can influence the structure energetics of surface …
-
Eddy-mean flow interactions in western boundary current jets
This thesis examines the nature of eddy-mean flow interactions in western boundary current jets and recirculation gyre dynamics from both theoretical and observational perspectives. It includes theoretical studies of eddy-mean flow interactions in idealized configurations relevant to western …
-
Physical controls on copepod aggregations in the Gulf of Maine
… The summertime mean surface circulation and eddy kinetic energy are computed from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an …
-
On quasi-periodic Baroclinic variability in the extratropical circulation
… (BAM), and is responsible for the modulation of eddy heat fluxes, eddy kinetic energy, and precipitation on large scales. However, the extent to which this periodic modulation is discernable or significant on smaller spatial scales had not yet been established. Using data from the ECMWF Interim …
-
The Lorenz Energy Cycle of the Global Atmosphere during the past 35 Years (1979-2013)
The Lorenz energy cycle (Lorenz 1955) describes how the solar heating generates potential energy that can be converted into kinetic energy to drive Earth’s atmospheric system. Therefore, the studies of the Lorenz energy cycle can help us understand the atmospheric system from a unique energy …
-
Assessment of a predictability index for humpback whales' supergroups occurrences in the Southern Benguela
… within the focus region. Notable changes in eddy kinetic energy and outward transport since 2017 suggest an increased variability in resource availability within the environment. The aggregations of humpback whale super- groups since 2017 occurred at smaller spatial scales near the Cape …
-
Impact of the Agulhas Current on storm development
… higher rain rates (mm.hrˉ¹), eight show higher Eddy Kinetic Energy (EKE) (m².sˉ²) and nine show greater upward moisture flux at the surface (g.mˉ².sˉ¹) compared to the SMTH run once each storm has propagated over the Current. Model output analysis shows sustained or dissipating storm intensity …
-
Physical controls on copepod aggregations in the Gulf of Maine
… The summertime mean surface circulation and eddy kinetic energy are computed from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an …
-
Influence of Tides and Mesoscale Eddies in the Ross Sea
… a reduced amount of Ice Shelf Water. Analysis of eddy formation in the model indicates that the weak stratification produces small and short-lived mesoscale eddies in the Ross Sea. The increased resolution approximately doubles the number of eddies seen in one year of simulation and significantly …
-
Eddy-mean flow interactions in western boundary current jets
This thesis examines the nature of eddy-mean flow interactions in western boundary current jets and recirculation gyre dynamics from both theoretical and observational perspectives. It includes theoretical studies of eddy-mean flow interactions in idealized configurations relevant to western …
-
The upper ocean response to the monsoon in the Arabian Sea
… shows mildly elevated levels of surface eddy kinetic energy along the Arabian coast during the SW monsoon, suggesting that such offshore transport may be an important component of the Arabian Sea heat budget. The sea surface temperature (SST) and mixed layer depth are observed to respond …
-
The upper ocean response to the monsoon in the Arabian Sea
… shows mildly elevated levels of surface eddy kinetic energy along the Arabian coast during the SW monsoon, suggesting that such offshore transport may be an important component of the Arabian Sea heat budget. The sea surface temperature (SST) and mixed layer depth are observed to respond …
-
Dynamical processes in the evolution of Cut Off Lows over South Africa
… development was investigated in detail using the eddy kinetic energy (EKE) budget applied to data from ERA5 reanalysis. This approach considers the most important processes involved such as the Ageostrophic flux convergence (AFC), Baroclinic convergence (BRC) and the Barotropic convergence (BRT). …
-
An altimetry based examination of the path and variability of the Agulhas Return Current
… flow path, seasonal cycle, meridional trends and eddy kinetic energy (EKE) of the ARC is possible. Here we provide a detailed description of the flow path of the ARC together with several mechanisms that may be contributing to the current’s apparent stability. In addition we demonstrate that the …
-
Event characteristics of intra-seasonal climate circulations
… temperature), moisture and heat transport, and energy exchange - with attention to tropical-extratropical cloud-bands, are central to wet seasons in South Africa. These are generally associated with deep convection that is driven by vertical instability. Transport of moisture into South Africa …
-
Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics
… through coupling of dust radiative forcing with eddy energetics of the African easterly jet-African easterly waves (AEJ-AEWs) systems. This study quantified the thermal/mechanical impacts of oceanic SAL on activity of the AEWs and the regional feedback of eddies onto the mean-circulations from a …
Page 1 of 2