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 98 for “"Vertical mixing"”.
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Enhanced vertical mixing within mesoscale eddies due to high frequency winds in the south China sea
… strongly influence the oceanic transport and mixing. With an ensemble of numerical integrations using a regional ocean model, this work investigates how the temporal resolution of the atmospheric forcing fields modifies the horizontal and vertical velocity patterns and impacts the transport …
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Shear-Induced Vertical Mixing in the Wyville Thomson Basin: A Study of its Driving Mechanisms, Strength and Influence
… theoretical studies to aid their interpretation. Vertical mixing in the study region is strongly coupled with the internal tide, generated by flow over the local topographic features. Modelling work shows the strength of mixing calculated from the observations to be representative of the study …
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Rates of vertical mixing, gas exchange, and new production : estimates from seasonal gas cycles in the upper ocean near Bermuda
… obtained from three years of monthly detailed vertical profiles near Bermuda (Station S, 32°N 64°W), show a maximum in argon supersaturation of about 4% in the seasonal thermocline in late summer. Since the argon supersaturation is 3-4 times smaller than that of oxygen, most of the oxygen …
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A numerical study of surface air temperature response to vertical mixing and momentum extraction by wind farms and the impacts of wind farms on mesoscale boundaries
… the wind turbines’ thrust coefficient and the vertical wind speed. The high resolution numerical model is also used to analyze the propagation of mesoscale boundaries near and through the wind farm. When compared to the control run, the experimental simulation shows an acceleration of the …
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Drivers of Spatial Dispersion and Residence Time of Coarse Sediment in Gravel-Bed Rivers
… disperses primarily in the streamwise and vertical directions. While travel times of sediment in the channel are brief, rest times between periods of mobilization can be relatively extensive. Both phases of transport are investigated with a focus on physical drivers and interactions between …
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Quantifying exchange processes in the urban canopy layers of dense neighborhoods
… representative urban forms are defined and the vertical mixing potential is quantified for each case using computational fluid dynamics ( CFD). Insight is gained into the flow phenomena responsible for these results and the findings are presented in the context of urban design. Dense, …
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Cooling and internal waves on the Continental Shelf
… ocean are initially modulated by the intense vertical mixing driven by surface cooling. The strong vertical mixing prevents the formation of geostrophic flows and inhibits the cross-shelf flux of heat. The vertical mixing is eventually suppressed by the advective transport of cold, dense water …
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Residence time in coastal canopies
… where flow is typically wavedominated, vertical mixing is believed to be the dominant process controlling residence time and, therefore, exchange. However, experiments have shown that wave-driven flows over rough boundaries, such as canopies, generate strong onshore mean currents (75% of …
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The influence of the land-sea breeze on coastal upwelling systems
… the drivers of diurnal-inertial variability and vertical mixing in EBUS due to land-sea breeze forcing near the critical latitude. The amplitude of the diurnal anticyclonic rotary component of the wind stress (τ ac0 ) is shown to be a good predictor of the locally forced response. The water depth …
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Upper ocean response to storms: a resonant system
… associated decrease in MLT is primarily due to vertical heat re-distribution within the water column rather than heat loss to the atmosphere. This thesis describes an investigation of the phenomenon of episodic cooling. The approach taken was to identify a vertical mixing model which reproduced …
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Factors Affecting the Kinetics of Light Intensity Adaptation in Marine Phytoplankton
… can be used to provide information about the vertical mixing processes in the upper mixed layer. To be useful as a parameter in a model of photoadaptation and vertical mixing, the response of a photoadaptive variable to changes in growth irradiance must be monotonic, significant, and …
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The effects of ocean eddies on tropical cyclones
… of the numerical Price–Weller–Pinkel (PWP) vertical mixing model has previously been used to simulate and study the cold wakes of Atlantic hurricanes. The model has not been used in comparison with observations of typhoons in the Western Pacific Ocean. In 2010 several typhoons were studied …
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The effects of ocean eddies on tropical cyclones
… of the numerical Price-Weller-Pinkel (PWP) vertical mixing model has previously been used to simulate and study the cold wakes of Atlantic hurricanes. The model has not been used in comparison with observations of typhoons in the Western Pacific Ocean. In 2010 several typhoons were studied …
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The evolution of ocean fronts in the presence of mixed layer turbulence
… balanced by a geostrophic (or thermal wind) vertically-sheared along-front flow. However, fronts in the ocean and atmosphere co-exist with small-scale turbulence which disrupts this balance. Analytic models of fronts have often neglected the effects of small-scale turbulence; however, more …
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Picophytoplankton photoacclimation and mixing in the surface oceans
Fluctuations in light intensity due to vertical mixing in the open ocean surface layer will affect phytoplankton physiology. Conversely, indicators of phytoplankton photoacclimation will be diagnostic of mixing processes if the appropriate kinetics are known. A combination of laboratory and field …
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Mechanisms and variability of salt transport in partially-stratified estuaries
… dramatically during stratified periods when vertical mixing is weak. Analysis of salt transport from observations in the Hudson Estuary show that stratified periods with elevated estuarine salt transport occur in five-day intervals once a month during apogean neap tides. Oscillatory salt …
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Mechanisms and variability of salt transport in partially-stratified estuaries
… dramatically during stratified periods when vertical mixing is weak. Analysis of salt transport from observations in the Hudson Estuary show that stratified periods with elevated estuarine salt transport occur in five-day intervals once a month during apogean neap tides. Oscillatory salt …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… in ocean physics, specifically changes in vertical mixing, is shown to significantly impact both cycles. The impact of interannual variability on the detection and attribution of anthropogenic carbon (Canthro) and the storage of Canthro in the Atlantic Ocean is analyzed using a …
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