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 68 for “"Ocean basins"”.
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Geophysical studies of plate-boundary earthquakes and mid-plate volcanism in the ocean basins
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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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 …
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The role of North Atlantic Deep Water formation in the thermohaline circulation
An ocean general circulation model is used to explore the global ocean thermohaline circulation. North Atlantic Deep Water formation is an important component of this system and the role of this process in the ventilation, structure and variability of all the world ocean basins is studied. The …
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Reconstructing atmospheric changes in monsoon regions using eolian dust
… continental interiors and exported by winds to ocean basins, providing a sedimentary archive which is one of the few direct indicators we have of atmospheric circulation in the past. This archive can be utilized in regions of dust transport also affected by monsoons to examine how different …
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Understanding ocean iron dynamics and impacts on marine ecosystems
… nutrients for phytoplankton growth in the ocean, making it a crucial element in the regulation of the ocean carbon balance and biogeochemical cycles. Atmospheric deposition of dissolved Fe (dFe) to the ocean has increased over the last decades partly due to human activities, which can …
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The centennial and millennial variability of the IndoPacific Warm Pool and the Indonesian Throughflow
As the only low-latitude connection between ocean basins, the Indonesian Throughflow allows the direct transmission of heat and salinity between the Pacific and Indian Oceans. The Mg/Ca and δ18O of calcite of Globigerinoides ruber (G. ruber) were used to estimate the sea surface temperature (SST) …
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Carbon Cycling Dynamics Inferred from Carbon Isotope Sourcing in a Mid-Latitude Karst-Influenced River
… inorganic carbon from terrestrial watersheds to ocean basins. Stable carbon isotopes (13C/12C) were collected weekly and input into the mixing model IsoSource to delineate seasonal carbon sourcing along two nested basins in the upper Green River System, Kentucky. In the more siliciclastic …
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Stability of large-scale oceanic flows and the importance of non-local effects
… that involve the stability of largescale oceanic flows and the importance of non-local effects. The first problem examines the stability of meridional boundary currents, which are found on both sides of most ocean basins because of the presence of continents. A linear stability analysis of …
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The crustal structure and subsidence history of aseismic ridges and mid-plate island chains
… locally compensated by an over thickening of the oceanic crust. Maximum crustal thicknesses are 15-30 km. The western Walvis Ridge is also compensated by crustal thickening; however, the isostasy of this part of the ridge is best explained by a plate model of compensation with elastic plate …
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Mass, heat, oxygen and nutrient fluxes at 30°S and their implications for the Pacific-Indian through flow and the global heat budget
… sections, two in each of the three major ocean basins, are employed in a set of inverse calculations to determine the extent of exchange between the Pacific and Indian Oceans through the Indonesian Archipelago and the net global oceanic heat flux at 30°S. Using a model which combines the …
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Granitic Rocks of Ophiolites
… in other ophiolites, some island arcs and in the ocean crust is reviewed. Plagiogranites in ophiolites can be distinguished from all other granitic rocks by their almost complete lack of potassium feldspar, low alumina content, high K/Rb ratio and their LREdepleted, flat or "dished" rare earth …
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
The mechanisms of faunal dispersal across ocean basins are key unknowns toward understanding of the modern biogeography and biodiversity of deep-sea fauna. Seamounts are considered to play a defining role in faunal evolution, acting as regional centers of speciation, "stepping-stones" for …
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Ocean circulation and carbon cycle dynamics in the Pacific Southern Ocean during Late Pleistocene interglacials
The Southern Ocean is a key component of the global ocean overturning circulation, enabling water mass exchange between ocean basins, driving Antarctic Bottom Water and Antarctic Intermediate Water formation and providing the major return path of Circumpolar Deep Water (CDW) to the ocean surface. …
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Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
… in the water column and removed from the ocean by particle scavenging and burial in sediments, offer a means for paleoceanographers to examine past dynamics of both water column and sedimentary processes. I show for the first time that a state of balance exists between 230Th production and …
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Rainfall variability over southern Africa
… anomalies (SSTAs) in each of the three major ocean basins as well as variability in the strength and position of regional atmospheric features. One of the atmospheric factors that may play a substantial role in southern African rainfall variability is the Botswana high, a high pressure cell …
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On the meridional heat transport and its partition between the atmosphere and oceans
… and its partition between the atmosphere and oceans using models and data. I focus on three primary questions: (1) What is the total heat transport and its partition between the two fluids? (2) What sets the magnitude of the total heat transport and to what extent is it sensitive to the …
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Tagging wild cetaceans : investigating the balance between more and less invasive techniques
… allowing researchers to track movements across ocean basins and investigate fine-scale behavior deep below the surface. The earliest cetacean tags were Discovery marks developed by the British Colonial Office at the turn of the 20th century, and their influence continues to inform some of the …
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Tropical cyclone size in observations and in radiative-convective equilibrium
… with statistically significant variation across ocean basins, but with minimal correlation with various dynamic and thermodynamic parameters. Second, the sensitivity of the structure of a numerically-simulated axisymmetric tropical cyclone at statistical equilibrium to the set of relevant model, …
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Basin Evolution and Slope System Dynamics of the Cretaceous Magallanes Basin, Chilean Patagonia
Deep-marine basins linked to active continental margins by sloped ocean-floor profiles commonlyhost the final accumulation of sediment that was eroded and transported from the continents. Thedeep-marine sediment archives preserved in these settings commonly offer the most completerecord of sediment …
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Energy and Moisture Transport in the Earth Climate System: Mean State and the Perturbation Response
… continent and cooling elsewhere. Atmosphere and ocean both anomalously transport energy southward in the Southern Hemisphere. Near Antarctica, poleward energy and momentum transport by baroclinic eddies strengthens. Anomalous southward cross-equatorial energy transport is associated with a …
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