The purpose, of this mini dissertation is to understand South Africa as a country in a spatial crisis that leads to the entrapment of the black body in a social, political, economic and legally depressed state. The crisis describes and is as a result of the multiple upheavals and ruptures that have shaped the post-colonial, particularly African, landscape, and experiences of its people. Particular to the post-colonial landscape is that these ruptures are largely defined by the history of extraction, exclusion and violence by the white elite against the black poor. The nature of the crisis is that it continues to support and re-enact the same colonial oppressive outcomes, ensuring the black poor continue to exist in a state of marginalisation. The spaces in the crisis also work to physically push out and keep marginalised black people in informal spaces away from economic activity. But additionally, the intangible elements of space mean that black people carry the consequences and definitions of these spaces with them which define how they are interpellated, ensuring that in and out of the physical space they are viewed as sub-human. In this dissertation I am particularly interested in how transformative constitutionalism can proactively facilitate spatial justice for the historically and presently marginalised in ameliorating the effects of the crisis. Spatial justice, in my understanding would mean the removal of the abyssal line and simultaneity between those interpellated as human and sub-human. / Mini Dissertation (LLM)--University of Pretoria, 2019. / Jurisprudence / LLM / Unrestricted

The oceanic lithosphere forms as a residue of partial melting of the mantle beneath the mid-ocean ridge axis. Subduction of this residual layer has a profound impact on the Earth’s thermal and geochemical cycles as the recycling of this layer facilitates heat loss from the Earth’s interior and induces geochemical heterogeneities in the mantle. The goal of this study is to understand the thermal and geochemical evolution of the oceanic lithospheric mantle from a petrological perspective. An empirical geobarometer is calibrated for ocean island xenoliths in order to understand the thermal structure of the oceanic lithospheric mantle. The results of 0.1 MPa experiments from this study and high-pressure experiments from previous studies are used in the calibration. The uncertainties on pressures derived using the above geobarometer are high and hence could not be tested against thermal models for the oceanic lithosphere. The geochemical evolution of the oceanic lithospheric mantle involves post-melting geochemical modifications such as metasomatism. The geochemical evolution of the uppermost oceanic lithospheric mantle is studied using harzburgites from Hess Deep ODP Site 895, which are depleted in moderately incompatible elements relative to the global suite of abyssal peridotites. A comparison between Yb-abundances in Hess Deep harzburgites iii iv and those of a model depleted MORB mantle (DMM) residue reveals that the harzburgites have undergone up to 25% melting, assuming 0.5% melt porosity. Higher light and middle rare earth elements in the Hess Deep harzburgites than the model DMM melting residue are interpreted as the result of plagioclase crystallisation from melts being extracted by diffuse porous flow through the upper mantle. The effect of plagioclase crystallisation does not affect the chemistry of residual mineral phases as evidenced from the depleted light rare earth element abundances in clinopyroxene relative to the bulk rock. Ocean island xenoliths are studied to understand when and where metasomatism occurs in the deeper portion of the oceanic lithosphere. The median values of measured and reconstructed bulk concentration of Al2O3 in most ocean island xenoliths is lower than in abyssal peridotites, which generally would be interpreted as indicating a higher extent of melting in the former. However, a comparison between Yb- abundances in ocean island xenoliths and abyssal peridotites with a model DMM melting residue suggests that the extents of melting in the suites of rocks are broadly similar. Although fewer in number than ocean island xenoliths, abyssal peridotites from several locations have low concentrations of moderately incompatible elements. Metasomatism is observed in both, ocean island xenoliths and abyssal peridotites in the form of higher bulk rock Ce and Nd concentration than the model DMM melting residue but the extent of metasomatism is higher in ocean island xenoliths. There is no correlation between the concentrations of bulk rock Ce, Nd, Sm and Eu of ocean island xenoliths and age of the oceanic lithosphere from which the xenoliths originate. It is interpreted that metasomatism in the lower oceanic lithospheric mantle occurs near the ridge axis above the wings of the melting column. / Graduate / 0996 / 0372

Previous numerical and theoretical results based on constant diapycnal diffusivity suggested the abyssal meridional overturning circulation (MOC) should weaken as winds over the Southern Ocean intensify. We corroborate this result in a simple ocean model, but find it does not hold in more complex models. First, models with a variable eddy transfer coefficient and simple yet dynamic atmosphere and sea-ice models show an increase, albeit slightly, of the abyssal MOC under increasing winds. Second, the abyssal MOC significantly strengthens with winds when diapycnal diffusivity is parameterized to be energetically supported by the winds. This tests the emerging idea that a significant fraction of the wind energy input to the large-scale ocean circulation is removed by mesoscale eddies and may then be transferred to internal lee waves, and thence to bottom-enhanced diapycnal mixing. A scaling theory of the abyssal MOC is extended to incorporate this energy pathway, corroborating our numerical results. / Graduate / 0415 / gstanley@uvic.ca

Thesis (docteur)--Université de Bretagne occidentale, Centre océanologique de Bretagne, 1978. / Includes bibliographical references (leaves [99]-107) and index.

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980. / Microfiche copy available in Archives and Science. / Bibliography: leaves 92-98. / by Eric Arthur D'Asaro. / Ph.D.

Trata-se de um estudo interdisciplinar que aborda os aspectos socioambientais dos problemas associados ao uso da terra e à conservação da natureza, frente à legislação brasileira vigente e dentro da perspectiva da Ecologia Política. Em especial, dedica-se à Biotecnologia Moderna e ao Direito. Mais especificamente, procurou-se analisar a proteção da plantas geneticamente modificadas através de direitos de patente [direitos relativos à propriedade industrial] em contraposição à obrigação de se cumprir uma função socioambiental. A partir da teoria das linhas abissais proposta por Boaventura de Sousa Santos, buscou-se um aprofundamento da perspectiva socioambiental dos problemas relacionados à Biotecnologia Moderna. Verificou-se se os aspectos socioambientais são considerados em conjunto pela legislação e quais as implicações desta relação. Este trabalho foi desenvolvido por meio de pesquisa bibliográfica e documental, tanto em relação à Biotecnologia Moderna, quanto ao Direito. Há expectativa de que este estudo contribua com subsídios necessários para a defesa dos interesses humanos mais básicos atingidos pelos resultados das ciências genéticas e suas aplicações na agricultura moderna no Brasil. / This inter-disciplinary study focus the social-environmental issues associated to land use and to the conservation of nature in view of the current Brazilian legislation and within a Political Ecology perspective. In particular, it is dedicated to Modern Biotechnology and Law. More specifically, we analyzed the protection of plants through patent rights [industrial property rights] in contraposition to the obligation to comply with the socio-environmental function. As a follow-up of the abyssal line theory proposed by Boaventura de Souza Santos, we look for a deepening of the socio-environmental perspective of the problems related to Modern Biotechnology. We verified if the socio-environmental aspects are being considered by the legislation, and which are the implications of this relation. This study was developed through literature and documental search, as much in Modern Biotechnology as in Law. It is expected that this study contributes with subsidies to the defense of the most basic human interests, hit by the results of genetic sciences and their applications in modern agriculture in Brazil.

Thesis (S.M.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2010. / Includes bibliographical references (p. 54-56). / This paper begins to explore a previously neglected mechanism for abyssal ocean mixing using bottom boundary layer dynamics. Abyssal mixing and the associated upward buoyancy fluxes are necessary to balance the sinking of dense waters at high latitudes and to close the global overturning circulation. Previous studies have concentrated on the hypothesis that the primary mechanism for this mixing is breaking internal waves generated by tidal flows over rough topography. However, intriguing observations, particularly from the Brazil Basin Tracer Release Experiment, suggest that mixing in the flank canyons of the Mid-Atlantic Ridge generated when strong mean flows interact with the many sills and constrictions within the canyons may represent a dynamically important amount of abyssal mixing. The energy pathways and mechanisms of this mixing are much less clear than in the case of breaking internal waves. This study attempts to clarify this by suggesting an analogy with an idealized diffusive boundary layer over a sloping bottom. This boundary layer is characterized by up-slope flows powered by the buoyancy flux in the fluid far from the boundary. Here we explore the energy budget of the boundary layer, and find that the diffusive boundary layer provides flows that are generally consistent with those observed in submarine canyons. In addition, we derive the vertical velocity in the far-field fluid, analogous to an Ekman pumping velocity, that these boundary layers can induce when the bottom slope is not constant. Finally, we present both theoretical and numerical models of exchange flows between the bottom boundary and the far-field flow when the bottom slope is not constant. These exchange flows provide a mechanism by which boundary-driven mixing can affect the overall stratification and buoyancy fluxes of the basin interior. / by Rebecca Walsh Dell. / S.M.

Trata-se de um estudo interdisciplinar que aborda os aspectos socioambientais dos problemas associados ao uso da terra e à conservação da natureza, frente à legislação brasileira vigente e dentro da perspectiva da Ecologia Política. Em especial, dedica-se à Biotecnologia Moderna e ao Direito. Mais especificamente, procurou-se analisar a proteção da plantas geneticamente modificadas através de direitos de patente [direitos relativos à propriedade industrial] em contraposição à obrigação de se cumprir uma função socioambiental. A partir da teoria das linhas abissais proposta por Boaventura de Sousa Santos, buscou-se um aprofundamento da perspectiva socioambiental dos problemas relacionados à Biotecnologia Moderna. Verificou-se se os aspectos socioambientais são considerados em conjunto pela legislação e quais as implicações desta relação. Este trabalho foi desenvolvido por meio de pesquisa bibliográfica e documental, tanto em relação à Biotecnologia Moderna, quanto ao Direito. Há expectativa de que este estudo contribua com subsídios necessários para a defesa dos interesses humanos mais básicos atingidos pelos resultados das ciências genéticas e suas aplicações na agricultura moderna no Brasil. / This inter-disciplinary study focus the social-environmental issues associated to land use and to the conservation of nature in view of the current Brazilian legislation and within a Political Ecology perspective. In particular, it is dedicated to Modern Biotechnology and Law. More specifically, we analyzed the protection of plants through patent rights [industrial property rights] in contraposition to the obligation to comply with the socio-environmental function. As a follow-up of the abyssal line theory proposed by Boaventura de Souza Santos, we look for a deepening of the socio-environmental perspective of the problems related to Modern Biotechnology. We verified if the socio-environmental aspects are being considered by the legislation, and which are the implications of this relation. This study was developed through literature and documental search, as much in Modern Biotechnology as in Law. It is expected that this study contributes with subsidies to the defense of the most basic human interests, hit by the results of genetic sciences and their applications in modern agriculture in Brazil.

L'Eau Antarctique de Fond constitue la principale masse d'eau océanique par son volume, et nourrit la composante la plus profonde et la plus lente de la circulation océanique. Les processus qui régissent son cycle de vie sont donc clé pour la capacité de stockage de l'océan en carbone et chaleur aux échelles centennales à multi-millénaires. Cette thèse tente de caractériser et quantifier les principaux processus responsables de la destruction (synonyme d'allègement et de remontée) de l'Eau Antarctique de Fond dans l'océan abyssal. A partir d'une estimée issue d'observations de la structure thermohaline de l'océan mondial et de diagnostics fondés sur le budget de densité des eaux profondes, les rôles respectifs du chauffage géothermal, du mélange turbulent par déferlement d'ondes internes et de la géométrie des bassins sont évalués. Il est montré que la géométrie de l'océan gouverne la structure de la circulation de l'Eau Antarctique de Fond. La contribution du déferlement des ondes internes, bien que mal contrainte, est estimée insuffisante pour maintenir un rythme de destruction de l'Eau Antarctique de Fond comparable à celui de sa formation. Le chauffage géothermal a quant à lui un rôle important pour la remontée des eaux recouvrant une large surface du lit océanique. Les résultats suggèrent une réévaluation de l'importance du mélange au niveau des détroits et seuils profonds, mais aussi du rôle fondamental de la forme des bassins, pour l'allègement et le transport des eaux abyssales. / Antarctic Bottom Water is the most voluminous water mass of the World Ocean, and it feeds the deepest and slowest component of ocean circulation. The processes that govern its lifecycle are therefore key to the ocean's carbon and heat storage capacity on centennial to multi-millennial timescales. This thesis aims at characterizing and quantifying processes responsible for the destruction (synonymous of lightening and upwelling) of Antarctic Bottom Water in the abyssal ocean. Using an observational estimate of the global ocean thermohaline structure and diagnostics based on the density budget of deep waters, we explore the roles of basin geometry, geothermal heating and mixing by breaking internal waves for the abyssal circulation. We show that the shape of ocean basins largely controls the structure of abyssal upwelling. The contribution of mixing powered by breaking internal waves, though poorly constrained, is estimated to be insufficient to destroy Antarctic Bottom Water at a rate comparable to that of its formation. Geothermal heating plays an important role for the upwelling of waters covering large seafloor areas. The results suggest a reappraisal of the role of mixing in deep straits and sills, but also of the fundamental role of basin geometry, for the lightening and transport of abyssal waters.

Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2013. / Cataloged from PDF version of thesis. / Includes bibliographical references (p. 160-163). / Physical oceanographers have known for several decades the total amount of abyssal mixing and upwelling required to balance the deep-water formation, but are still working to understand the mechanisms and locations-how and where it happens. From observational studies, we know that areas of rough topography are important and the hundreds of Grand-Canyon sized canyons that line mid-ocean ridges have particularly energetic mixing. To better understand the mechanisms by which rough topography translates into energetic currents and mixing, I studied diffusive boundary layers over varying topography using theoretical approaches and idealized numerical simulations using the ROMS model. In this dissertation, I show a variety of previously unidentified characteristics of diffusive boundary layers that are likely relevant for understanding the circulation of the abyssal ocean. These boundary layers share many important properties with observed flows in abyssal canyons, like increased kinetic energy near topographic sills and strong currents running from the abyssal plains up the slopes of the mid-ocean ridges toward their crests. They also have a previously unknown capacity to accelerate into overflows for a variety of oceanographically relevant shapes and sizes of topography. This acceleration happens without external forcing, meaning such overflows may be ubiquitous in the deep ocean. These boundary layers also can force exchange of large volumes of fluid between the relatively unstratified boundary layer and the stratified far-field fluid, altering the stratification far from the boundary. We see these effects in boundary layers in two- and three-dimensions, with and without rotation. In conclusion, these boundary layer processes, though previously neglected, may be a source of a dynamically important amount of abyssal upwelling, profoundly affecting predictions of the basin-scale circulation. This type of mechanism cannot be captured by the kind of mixing parameterizations used in current global climate models, based on a bottom roughness. Therefore, there is much work still to do to better understand how these boundary layers behave in more realistic contexts and how we might incorporate that understanding into climate models. / by Rebecca Walsh Dell. / Ph.D.