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 18 of 18 for “"Kelvin waves"”.
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Kelvin waves in a shoaling shallow sea
… these methods. The problem of a propagation of a Kelvin wave over a step-bottom in a semi-infinite canal closed at one end is considered. The solution obtained is compared with that generated by the long-time limit of a numerical solution for the time dependent initial value problem. A mean square …
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The Role of Kelvin Waves on the Circulation and Salt Transport Variability in the Coastal Bay of Bengal
<p>Kelvin waves are internal ocean waves that balance the Earth's Coriolis force against a wave boundary such as a coastline or the equator. In the Indian Ocean, Kelvin waves originate from Wyrtki jets off the east African coast and propagate along the equatorial wave guide until reaching Sumatra, …
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Makassar Strait Intraseasonal Variability
… forced part is linked to equatorial Indian Ocean Kelvin waves and Sulawesi Sea eddies. The oceanic response to the local wind stress varying at periods of 45-90 days, with 60-day oscillation showing the strongest coherence, is constrained to along-strait flow primarily within the upper 50 m of the …
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Characterisations of Different El Nino Types, their Physical Causes and Predictions
… ZWA describes the potential for triggering Kelvin waves for a given initial West Pacific recharge state as captured by PTA. A cross-validated statistical model is developed to hindcast the 1980-2016 Nov-Dec-Jan (NDJ) mean Niño3.4 SSTA based on the two parameters. The model is comparable to, …
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Observations of long period waves in the tropical oceans and atmosphere
… baroclinic, equatorially-trapped inertia-gravity waves (discovered by Wunsch and Gill (1976)) is confirmed in the mid-Pacific by spectral analysis of long sea level records. The energy of the low-mode inertia-gravity waves is found to decrease toward the meridional boundaries. A simple spectral …
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Evaluating CFSv2 Subseasonal Forecast Skill with an Emphasis on Tropical Convection
… spectrum, lacks distinct peaks for the MJO and Kelvin waves, and confirms the propagation issues noted above. These flaws in tropical convection, which may be tied to mean state biases originating from cumulus parameterization, affect atmospheric teleconnections and could thus degrade extended …
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ENSO forced variations of the sea surface temperature and adjusted sea level along the west coast of the United States
… These were used to characterize the structure of waves associated with the propagation. of the positive surface temperature and adjusted sea level anomalies. These wave characteristics were found to be consistent with coastally trapped internal Kelvin waves, due to their phase speed, wavelength …
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The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations
… Height (SSH) to understand the interaction of Kelvin and Rossby waves with the MJO. It appears that propagations of the MJO force equatorial Kelvin waves in the Indian Ocean as shown by a lag between Outgoing Longwave Radiation (OLR) and SSH in wavelet analysis. Equatorial Rossby waves also …
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Sea level variability in the Tropical Atlantic since 1993 and projections to 2100
… and Benguela Niños, driven by remote equatorial Kelvin waves (EKW) and local factors such as wind and freshwater fluxes. Analysis of coastal trapped Kelvin waves (CTWs) in the GoG in relation to major warming events in 2010, 2012, 2019 and 2021 shows a significant one-month lag between EKWs and …
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A model of the equatorial deep jets and the role of the horizontal Coriolis parameter
… deep jets as either low frequency, long Rossby waves or stationary,long 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. …
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On intraseasonal variability in the tropics: tropical cyclones, the Madden-Julian Oscillation, and equatorial waves
… is dominated by tropical cyclones, equatorial waves, and the Madden-Julian Oscillation (MJO). Because these phenomena have significant societal impacts on sub-seasonal time scales, and it is important to understand how they interact with the large-scale atmosphere. The first part of this thesis …
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On the paradox of convectively-coupled waves
This thesis investigates the forced response of waves on a linearized, shallow water beta-plane in an attempt to develop some gross understanding of the properties of convectively coupled waves. Two concepts are central to this new theory: (i) a convectively coupled wave is a forced wave; (ii) a …
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A study of Benguela Niños and Niñas from 1958 to 2015
… records help to define an index of equatorial Kelvin wave activities in the Equatorial Atlantic. There is a good agreement between PIRATA monthly dynamic height anomalies, altimetric monthly sea surface height anomalies (SSHA), and sea level anomalies calculated with an OLM at interannual time …
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The dynamics of unsteady strait and sill flow
… packets of nondispersive (long gravity or Kelvin) waves are generated which propagate away from the obstacle, leaving the far field unaffected. For bc < bO < bb, a bore is generated which moves upstream and partially blocks the flow. In the semigeostrophic case, the potential vorticity of …
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Influence of high latitude anomalies on tropical climate phenomena and global climate
… the tropical ocean and atmosphere.<br/>Ocean waves are capable of propagating long distances very fast. Barotropic waves (adjustments in free surface height) can propagate round the globe within days. Baroclinic waves, propagating along the thermocline are able to cross the equatorial Atlantic …
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Atmospheric Dynamics of Sub-Tropical Dust Storms
… meso-γ scale adjustment processes resulting in Kelvin waves in the Harmattan and the Bodélé Depression cases and the thermally-forced MPS circulation in all of these three cases. The Kelvin wave preceded a cold pool accompanying the air behind the large scale cold front instrumental in the major …
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The flow separations in the Taiwan Strait and ocean responses to the "hiatus" of the global mean surface temperature
… Except for the local wind forcing, the Coastal-Kelvin Waves (CKWs), intermittently propagating toward the TWS from north in winter, are an additional factor that could impact the flow patterns by changing cross-strait sea level gradient during the disaster. In the first stage (January …
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Driving the ocean's overturning : an adjoint sensitivity study
… of years to decades. Boundary and equatorial Kelvin waves and equatorially trapped Rossby waves carry information around the boundaries of the basin and across the equator in less than a decade for a basin of the size of the Atlantic. Advection of buoyancy perturbations has an important …