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 55 for “"Ocean-atmosphere interaction"”.
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Tropical cyclones in the South-West Indian Ocean : intensity changes, oceanic interaction and impacts
… the climatology, intensification and ocean atmosphere interaction in relation to the passage of tropical cyclones (TCs) in the South-West Indian Ocean (SWIO). A Climatology of TCs in the SWIO including landfall in the area of Mozambique and Madagascar was developed for the 1952-2007 …
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Global barotropic variability of the ocean in response to atmospheric forcing based on multichannel regression and Kalman filter techniques
… data are employed in the analysis of the global ocean response to atmospheric forcing. We use two different approaches to test the hypothesis that the global sea surface height variability can be adequately described by linear barotropic ocean models: the multichannel regression and the optimal …
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Study of basin scale acoustic transmissions
… the change in warming in the upper 100 m of the ocean was due only to changes in surface solar irradiance. The value of the surface solar irradiance anomalies necessary to cause the tomography results for warming (Spiesberger and Metzger, 1991) was computed. This value was larger than the actual …
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On the role of the Agulhas Current on weather and climate of South Africa
… of this thesis is to understand the impact of ocean-atmosphere interaction in the Agulhas Current on the atmosphere and to investigate its importance for Southern African rainfall. This warm Current creates a high temperature gradient with the surrounding ocean, leading to a large turbulent …
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Arabian Sea mixed layer deepening during the monsoon : observations and dynamics
… of concurrent local air-sea fluxes and upper ocean dynamics from the Arabian Sea. The winter northeast monsoon has moderate wind forcing and a strongly destabilizing surface buoyancy flux, driven by large radiative and latent heat losses at the sea surface. Convective entrainment is the …
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Refinement and application of a new paleotemperature estimation technique
… correlation has been found between open ocean paleo-SST estimates based on Uk37 values and those derived from δ180, for the period spanning approximately the last 100,000 years (Brassell, 1986b). These results indicate this technique has potential for determining paleo-SST from analysis …
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Inter-annual variability of acoustic ray travel times in the northeast Pacific
… understanding of them will increase knowledge of ocean-atmosphere interactions which affect weather and climate. A discussion of the program for finding the travel times is included along with a comparison of two methods of measuring travel times.
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Time-dependent ventilated thermocline
In this thesis, I study the time-varying behavior of a ventila ted thermocline with basin scales at annual and decadal time scales. The variability is forced by three external forcings: the wind stress (chapter 3), the surface heat flux (chapter 4) and the upwelling along the eastern boundary …
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Characterization of air-sea gas exchange processes and dissolved gas/ice interactions using noble gases
… infer rates of biological activity in the upper ocean or the uptake of radiatively important "greenhouse" gases, the noble gases are used to characterize and quantify the physical processes affecting the dissolved gases in aquatic environments. The processes of vertical mixing, gas exchange, air …
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Winter mixed-layer development in the central Irminger Sea : the effect of strong, intermittent wind events
The impact of the Greenland tip jet on the wintertime mixed-layer of the southwest Irminger Sea is investigated using in-situ moored profiler data and a variety of atmospheric data sets. The mixed-layer was observed to reach 400 m in the spring of 2003, and 300 m in the spring of 2004. Both of …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
Observations from a three-year field program on the inner shelf south of Martha's Vineyard, MA and a numerical model are used to describe the effect of stratification on inner shelf circulation, transport, and sediment resuspension height. Thermal stratification above the bottom mixed layer is …
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Atmospheric interactions with Gulf Stream Rings
… of Gulf Stream Rings as effected by atmospheric interactions. First, we compute the forced spin down of a Gulf Stream Ring. The variations in surface stress across the Ring necessary to spin it down are caused by the variations in relative air-sea velocity, of which the stress is a quadratric …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
This thesis presents an investigation of the influence of surface waves on momentum exchange. A quantitative comparison of direct covariance friction velocity measurements to bulk aerodynamic and inertial dissipation estimates indicates that both indirect methods systematically underestimate the …
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On the warm bias along the South-West African Coast in coupled models : an oceanic perspective
Coupled ocean/atmosphere simulations exhibit systematicwarm biases over the SouthWest African (SWA) coastal region. Recent investigations indicate that coastal ocean dynamics may play an important role in determining the SST patterns, but none of them provide a detailed analysis. In this study, I …
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Low-latitude western north atlantic climate variability during the past millennium : insights from proxies and models
… and may reflect the influence of internal oceanic and atmospheric circulation. Simulations with an atmospheric general circulation model (AGCM) indicate that the magnitude of cooling estimated by proxy records is consistent with tropical hydrologic proxy records.
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A model of the equatorial deep jets and the role of the horizontal Coriolis parameter
… Kelvin waves generated at or near the ocean surface. These models are unable to answer the question of how wind generated energy propagates down through the equatorial undercurrent and thermocline into the deep ocean. Existing numerical models do not display deep jet features due mainly …
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Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
… waves; wind stress; and heat flux between the ocean and atmosphere during 2001-2007. When waves are small, cross-shelf wind stress is the dominant mechanism driving cross-shelf circulation. The along-shelf wind stress does not drive a substantial cross-shelf circulation. The response to a given …
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Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
… and energy-containing eddies in the ocean surface boundary layer. A new technique was developed to separate wave and turbulent motions spectrally, using ideas for turbulence spectra that were developed in the study of the bottom boundary layer of the atmosphere. The observations of …
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex …
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Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
The work was motivated by studies of Austin and Lentz (2002) and Pedlosky (2007). The above mentioned works considered two different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly …
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