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 20 for “"Frontal zone"”.
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An analysis of variability in the South Atlantic
… Atlantic., especially in the Angola Benguela Frontal Zone.
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The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa
… and the shifting position of the Angola Benguela Frontal Zone (ABFZ), may be compounding this variability. Biological responses such as shifts in temperate species away from the warming mid latitudes, towards the cooler poles are becoming evident. This study aimed to quantify the effects of these …
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Synoptic and Mesoscale Dynamics of Snowbands in Winter Cyclones
… and progressed into the mid-level deformation zone associated with the trowal and warm frontal zone, they were stretched into elongated narrow bands particularly along the strongest and narrow deformation regions; (3) As bands propagated across the trowal, new bands developed at the interface …
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Warm and cold atmospheric frontogenesis
… than negative relative vorticity and the frontal zone at the surface develops in a zone of convergence. Model results indicate that cold fronts will propagate faster than warm fronts and that the fronts will develop on the time scale of 1-3 days. Linearization of the model demonstrates the …
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The kinematics and dynamics of the New England continental shelf and shelf/slope front
… region for one week in January 1975 to study frontal exchange processes. The mean currents during the March 1974 experiment all had a westward alongshore component, increasing in magnitude progressing offshore from ~5 cm/sec to a maximum at the nearshore edge of the shelf/slope front of …
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Zooplankton of the Cape Peninsula upwelling region
… brachiatus the most abundant organism. The frontal zone, with a strong thermal gradient, contained animals with distinct warm and cold water affinities as well as a group of species closely associated with the temperature gradient .The near-surface distribution of the bulk of the population, …
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Barium isotope cycling in the marine environment: Pathways of fractionation and implications for paleoceanographic applications
… Ba forms mainly in the surface of the Polar Frontal Zone in the presence of large particles and microbial activity. Next, I characterize the effect of ion exchange on BaSO₄, a process previously unstudied under marine conditions, in a laboratory setting. Ion exchange occurs rapidly between …
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Barium isotope cycling in the marine environment: pathways of fractionation and implications for paleoceanographic applications
… Ba forms mainly in the surface of the Polar Frontal Zone in the presence of large particles and microbial activity. Next, I characterize the effect of ion exchange on BaSO4, a process previously unstudied under marine conditions, in a laboratory setting. Ion exchange occurs rapidly between …
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Freshwater Transport on the Continental Shelf of the Southeastern United States
… to Cape Canaveral in a narrow baroclinic zone near the coast. Inner shelf fronts were produced by freshwater runoff. Downwelling favorable wind narrowed the baroclinic zone, inside of which a strong coastal jet developed. The runoff-induced residual circulation made a generally weak …
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Identifying Synoptic Controls on Boundary Layer Thermodynamic and Cloud Properties Using a Regional Forecast Model
… content, relative to observations. The cold frontal region exhibits convection associated with weak stability and ascent. Northwest of the cold front, the boundary layer is well-mixed, deeper, and capped by a strong inversion maintained by large-scale subsidence. The deep, well-mixed …
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Thermohaline variability of AAIW in the Atlantic sector of the Southern Ocean investigated using an Altimetry Gravest Empirical Mode
… and budgets is presented for each Southern Ocean frontal zone, along with the examination of the change in position of the isopycnal limits and resultant water mass thickness. So as to better understand one of the factors that may be influencing some of the changes detected within AAIW, property …
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Numerical model investigation of near-surface circulation features of the Angola Basin
… of the isotherms beneath the Angola Benguela Frontal Zone (ABFZ) is observed. In January, February, September, October and November the 'outcropping' of the thermocline-ridge is deepest and appears as a distinctly isolated cool feature at 4Sm. No clear cydonic circulation is associated with …
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Tectonometamorphic evolution of Medium-P granulites of the Namaqua Metamorphic Province at the Gordonia Subprovince marginal zone, southern Namibia
… the P-T-t evolution of a portion of the marginal zone between two major tectonic domains in the western NMC: the Richtersveld and Gordonia Subprovices is investigated, with the aim of resolving a P-T-t path for the peak to retrograde evolution of a major regional thrust, that will in turn help to …
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The evolution of ocean fronts in the presence of mixed layer turbulence
… of this turbulence and hence its effect on the frontal evolution. Here, we use idealised models to examine the influence of this small-scale turbulence on the evolution of ocean fronts in the case of strong mixing. First we consider the evolution of an initially balanced density front subject to …
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A survey of anticyclonic mesoscale eddies, within the Southern Ocean, and their propagation south from the South West Indian Ridge
… section of this ridge - the Andrew Bain Fracture Zone [ABFZ] - has been found to be the starting line of an eastward extending eddy corridor. Earlier research shows an area of diminishing mesoscale variability within this corridor which extends down from 45°S to approximately 60S. A recent study …
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Interannual variability and long-term trends of surface hydrography around the Prince Edward Island Archipelago, Southern Ocean
… climate change. They are positioned in the Polar Frontal Zone, which is constrained by the subAntarctic Front and the Antarctic Polar Front, all of which are part of the strong, uninterrupted Antarctic Circumpolar Current (ACC). Due to its remoteness and challenging accessibility, there is a …
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Surface and sub-surface hydrographic variability at the Prince Edward Islands: perspectives from the high resolution GLORYS model
… Current, nestled within the Antarctic Polar Frontal Zone of the Southern Ocean. The islands are home to a multitude of species which are supported by a sensitive and complex oceanic environment. Understanding the mechanisms at work, which sustain this rich ecosystem is therefore imperative …
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Detail of the thermal structure of oceanic fronts in the Southern ocean south of Africa
… the thermal characteristics of the major oceanic frontal systems in the Southern Ocean south of Africa based on data collected to a depth of 500 m on forty-three cruises during a fifteen year period. The width of the Agulhas Front has been shown to vary considerably in both its sea surface and …
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In the Margins: Reconsidering the Range and Contribution of Diazotrophs in Nearshore Environments
… cycling: the major pelagic oxygen deficient zones (ODZs) in the Eastern Tropical South (ETSP) and North (ETNP) Pacific Ocean, and the broad continental shelf of the Western North Atlantic Ocean (WNA). The ODZs are hypothesized to play an important role in N cycle homeostasis by generating …
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Numerische Simulation der Kohlenwasserstoffgenese an der Subduktionszone vor Costa Rica
… Despite this fact methane does not reach the frontal zone of the subduction complex because the very high migration velocities only occur in some parts of the sediments and velocities are not constantly higher than the subduction velocity. This means that the oil reaches the gas zone and is …