Academic literature on the topic 'Leeuwin Complex'
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Journal articles on the topic "Leeuwin Complex"
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Akhir, Mohd Fadzil, Charitha Pattiaratchi, and Michael Meuleners. "Dynamics and Seasonality of the Leeuwin Current and the Surrounding Counter-Current System in the Region South of Western Australia." Journal of Marine Science and Engineering 8, no. 8 (July 23, 2020): 552. http://dx.doi.org/10.3390/jmse8080552.
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Surface circulation associated with the Leeuwin Current System off the southern coast of Western Australia was simulated using the Regional Ocean Model Systems (ROMS). The Leeuwin current (LC) and Flinders current (FC) were reproduced in two simulation: with and without wind stress. The inclusion of wind resulted in a strong LC during autumn and winter months with the LC flowing close to the shelf, accelerating after reaching the south-west corner at Cape Leeuwin. The geopotential gradient was present through all seasons, indicating that it is the major driving force of the currents. At the subsurface, continuation of the opposing undercurrent present at the southwest corner. Interchanging of strength and transport between LC and FC can be seen between seasons, where LC strength drops significantly in autumn and winter when the wind stress is low and this subsequently increases the FC transport. The FC strength declines in summer when there is no wind stress, which during this time LC is stronger. Meanwhile, the analysis shows an inshore presence of Cresswell current is evident along the coast when there is south-easterly wind in summer. The study provides comprehensive overview of the complex currents system where wind influence proves to be determining factors to the current system.
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Myers, J. S. "Geological note: Anorthosite in the Leeuwin Complex of the Pinjarra Orogen, Western Australia." Australian Journal of Earth Sciences 37, no. 2 (June 1, 1990): 241–45. http://dx.doi.org/10.1080/08120099008727924.
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De Vleeschouwer, David, Marion Peral, Marta Marchegiano, Angelina Füllberg, Niklas Meinicke, Heiko Pälike, Gerald Auer, et al. "Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry." Climate of the Past 18, no. 5 (June 1, 2022): 1231–53. http://dx.doi.org/10.5194/cp-18-1231-2022.
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Abstract. The Pliocene sedimentary record provides a window into Earth's climate dynamics under warmer-than-present boundary conditions. However, the Pliocene cannot be considered a stable warm climate that constitutes a solid baseline for middle-of-the-road future climate projections. The increasing availability of time-continuous sedimentary archives (e.g., marine sediment cores) reveals complex temporal and spatial patterns of Pliocene ocean and climate variability on astronomical timescales. The Perth Basin is particularly interesting in that respect because it remains unclear if and how the Leeuwin Current sustained the comparably wet Pliocene climate in Western Australia, as well as how it influenced Southern Hemisphere paleoclimate variability. To constrain Leeuwin Current dynamics in time and space, this project obtained eight clumped-isotope Δ47 paleotemperatures and constructed a new orbitally resolved planktonic foraminifera (Trilobatus sacculifer) stable isotope record (δ18O) for the Plio-Pleistocene (4–2 Ma) interval of International Ocean Discovery Program (IODP) Site U1459. These new data complement an existing TEX86 record from the same site and similar planktonic isotope records from the Northern Carnarvon Basin (Ocean Drilling Program (ODP) Site 763 and IODP Site U1463). The comparison of TEX86 and Δ47 paleothermometers reveals that TEX86 likely reflects sea surface temperatures (SSTs) with a seasonal warm bias (23.8–28.9 ∘C), whereas T. sacculifer Δ47 calcification temperatures probably echo mixed-layer temperatures at the studied Site U1459 (18.9–23.2 ∘C). The isotopic δ18O gradient along a 19–29∘ S latitudinal transect, between 3.9 and 2.2 Ma, displays large variability, ranging between 0.5 ‰ and 2.0 ‰. We use the latitudinal δ18O gradient as a proxy for Leeuwin Current strength, with an inverse relationship between both. The new results challenge the interpretation that suggested a tectonic event in the Indonesian Throughflow as the cause for the rapid steepening of the isotopic gradient (0.9 ‰ to 1.5 ‰) around 3.7 Ma. The tectonic interpretation appears obsolete as it is now clear that the 3.7 Ma steepening of the isotopic gradient is intermittent, with flat latitudinal gradients (∼0.5 ‰) restored in the latest Pliocene (2.9–2.6 Ma). Still, the new analysis affirms that a combination of astronomical forcing of wind patterns and eustatic sea level controlled Leeuwin Current intensity. On secular timescales, a period of relatively weak Leeuwin Current is observed between 3.7 and 3.1 Ma. Notably, this interval is marked by cooler conditions throughout the Southern Hemisphere. In conclusion, the intensity of the Leeuwin Current and the latitudinal position of the subtropical front are both long-range effects of the same forcing: heat transport through the Indonesian Throughflow (ITF) valve and its propagation through Indian Ocean poleward heat transport. The common ITF forcing explains the observed coherence of Southern Hemisphere ocean and climate records.
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Cresswell, G. R., and D. A. Griffin. "The Leeuwin Current, eddies and sub-Antarctic waters off south-western Australia." Marine and Freshwater Research 55, no. 3 (2004): 267. http://dx.doi.org/10.1071/mf03115.
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Data from a research vessel cruise in late 1994 and several years of satellite observations revealed complex interactions of ocean features off south-western Australia. The ship measurements showed that the Leeuwin Current (LC) commonly ran at 0.5 m s–1 above the upper continental slope and extended down to approximately 250 m. South of the continent, a 200-km diameter anticyclonic eddy depressed the ocean structure in the upper 1000 m. The eddy showed influences of the LC, deep mixing in winter and summer heating. The sub-Antarctic water around the eddy was cooler, fresher and richer in nutrients and oxygen than both the eddy and the LC. Satellite thermal and topographic measurements showed that cyclonic eddies accelerated the LC along the southern upper continental slope, whereas anticyclonic eddies diverted it out to sea and then back again. The images suggested that weak eddies originating east of the Great Australian Bight migrate westward, first encountering the continental slope off the Recherche Archipelago. There, the anticyclonic eddies take on warm water from the LC and strengthen. Several anticyclonic eddies were followed westward beyond the archipelago for 18 months as they drifted at up to 5 km day–1 and interacted with the LC and with one another.
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Yu, Shihang, Xiaochun Liu, Bin Fu, Ian C. W. Fitzsimons, Longyao Chen, Wei-R. Z. Wang, Yuxing Lou, and Biao Song. "Petrogenesis and tectonic setting of mid-Neoproterozoic low-δ18O metamafic rocks from the Leeuwin Complex, southwestern Australia." Precambrian Research 368 (January 2022): 106473. http://dx.doi.org/10.1016/j.precamres.2021.106473.
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Collins, A. S. "Structure and age of the northern Leeuwin Complex, Western Australia: Constraints from field mapping and U–Pb isotopic analysis." Australian Journal of Earth Sciences 50, no. 4 (August 2003): 585–99. http://dx.doi.org/10.1046/j.1440-0952.2003.01014.x.
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Limbourn, A. J., R. C. Babcock, D. J. Johnston, P. D. Nichols, and B. Knott. "Spatial and temporal variation in lipid and fatty acid profiles of western rock lobster pueruli at first settlement: biochemical indicators of diet and nutritional status." Marine and Freshwater Research 60, no. 8 (2009): 810. http://dx.doi.org/10.1071/mf08244.
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Rock lobster species are found worldwide and have a life history that includes development through a planktonic phyllosoma followed by a nektonic non-feeding puerulus that relies on stored energy during recruitment into near-shore habitats. Recruitment to adult populations of western rock lobster (Panulirus cygnus) is highly variable and is likely to be strongly influenced by shelf width and oceanic conditions affecting cross-shelf transport and nutrition. Since the nutritional status of newly settled pueruli will reflect the phyllosoma feeding environment and distance swum, we studied levels of lipid, fatty acid (FA) and protein of 422 pueruli and 79 first instar juveniles from four Western Australian locations. Lipid levels generally were inversely related to shelf width but were variable, suggesting pueruli may travel complex trajectories to coastal settlement. Lipid and FA composition of pueruli were consistent with spatial and seasonal variation in Leeuwin Current and coastal productivity regimes. Seasonal differences in FA composition occurred regardless of the year of settlement. Pueruli had lower lipid levels during ENSO years, when recruitment tends to be lower also. Measures of puerulus nutritional status appear to provide valuable insights into the processes underpinning recruitment in Panulirus cygnus and other commercially and ecologically important species.
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Hobday, Alistair J., and Janice M. Lough. "Projected climate change in Australian marine and freshwater environments." Marine and Freshwater Research 62, no. 9 (2011): 1000. http://dx.doi.org/10.1071/mf10302.
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Changes in the physical environment of aquatic systems consistent with climate change have been reported across Australia, with impacts on many marine and freshwater species. The future state of aquatic environments can be estimated by extrapolation of historical trends. However, because the climate is a complex non-linear system, a more process-based approach is probably required, in particular the use of dynamical projections using climate models. Because global climate models operate on spatial scales that typically are too coarse for aquatic biologists, statistical or dynamical downscaling of model output is proposed. Challenges in using climate projections exist; however, projections for some marine and freshwater systems are possible. Higher oceanic temperatures are projected around Australia, particularly for south-eastern Australia. The East Australia Current is projected to transport greater volumes of water southward, whereas the Leeuwin Current on the western coast may weaken. On land, projections suggest that air temperatures will rise and rainfall will decline across much of Australia in coming decades. Together, these changes will result in reduced runoff and hence reduced stream flow and lake storage. Present climate models are particularly limited with regard to coastal and freshwater systems, making the models challenging to use for biological-impact and adaptation studies.
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Cyriac, Ajitha, Helen E. Phillips, Nathaniel L. Bindoff, and Ming Feng. "Characteristics of Wind-Generated Near-Inertial Waves in the Southeast Indian Ocean." Journal of Physical Oceanography 52, no. 4 (April 2022): 557–78. http://dx.doi.org/10.1175/jpo-d-21-0046.1.
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Abstract This study presents the characteristics and spatiotemporal structure of near-inertial waves and their interaction with Leeuwin Current eddies in the eastern south Indian Ocean as observed by Electromagnetic Autonomous Profiling Explorer (EM-APEX) floats. The floats sampled the upper ocean during July–October 2013 with a frequency of eight profiles per day down to 1200 m. Near-inertial waves (NIWs) are found to be the dominant signal in the frequency spectra. Complex demodulation is used to estimate the amplitude and phase of the NIWs from the velocity profiles. The NIW energy propagated from the base of the mixed layer downward into the ocean interior, following beam characteristics of linear wave theory. We visually identified a total of 15 near-inertial internal wave packets from the wave amplitudes and phases with a mean vertical wavelength of 89 ± 63 m, a mean horizontal wavelength of 69 ± 85 km, a mean horizontal group velocity of 3 ± 2 cm s−1, and a mean vertical group velocity of 9 ± 7 m day−1. A strong near-inertial packet with a kinetic energy of 20–30 J m−3 found propagating below 700 m suggests that the NIWs can contribute to deep ocean mixing. A blue shift of 10%–15% in the energy spectrum of the NIWs is observed in the upper 1200 m as the floats move toward the equator. The impacts of mesoscale eddies on the characteristics and propagation of the observed NIWs are also investigated. The elevated near-inertial shear variance in anticyclonic eddies suggests trapping of NIWs near the surface. Cyclonic eddies, in contrast, were associated with weak near-inertial shear variance in the upper 400 m.
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Wilson, Peter. "Progress towards resolution of the Indigofera monophylla complex (Fabaceae: Faboideae)." Telopea 24 (July 28, 2021): 311–17. http://dx.doi.org/10.7751/telopea15321.
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The application of the name Indigofera monophylla is clarified by reference to the type held in the Geneva herbarium and a revised description provided. The name has been widely applied to plants with rounded, unifoliolate leaves and some workers have suggested that there are multiple species within this broadly defined group. One of these, with restricted distribution within the Pilbara bioregion, has previously been given the phrase name Indigofera sp. Bungaroo Creek (S. van Leeuwen 4301) and is formally named here as Indigofera rivularis Peter G.Wilson. Two additional species in this complex are also described: Indigofera deserticola Peter G.Wilson & Rowe, is a species of sandplains occurring within the Great Sandy Desert and Dampierland Bioregions, and Indigofera rotula Peter G.Wilson, which is a species with smaller leaves and flowers that occurs primarily in areas south of the Pilbara. A key to these species is provided.
Dissertations / Theses on the topic "Leeuwin Complex"
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Schüler, Michael Verfasser], Jamal [Akademischer Betreuer] [Berakdar, Ingrid [Akademischer Betreuer] Mertig, and Robert [Akademischer Betreuer] Leeuwen. "Tracking inter-particle correlations by many-body spectroscopies from complex systems : [kumulative Dissertation] / Michael Schüler ; Jamal Berakdar, Ingrid Mertig, Robert Leeuwen." Halle, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-18967.
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Schüler, Michael Verfasser], Jamal [Akademischer Betreuer] Berakdar, Ingrid [Akademischer Betreuer] [Mertig, and Robert [Akademischer Betreuer] Leeuwen. "Tracking inter-particle correlations by many-body spectroscopies from complex systems : [kumulative Dissertation] / Michael Schüler ; Jamal Berakdar, Ingrid Mertig, Robert Leeuwen." Halle, 2016. http://d-nb.info/1122438672/34.
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Verco, R. T. "A metamorphic, geochronological and structural framework for the evolution of the Leeuwin Complex, south west Western Australia." Thesis, 2008. https://hdl.handle.net/2440/136898.
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This item is only available electronically.The Leeuwin Complex of southwestern Western Australia forms the best exposed component of the Pinjarra Orogen, where early Cambrian deformation and metamorphism represents one of the final events in Gondwana amalgamation. Three structurally different domains within the Leeuwin Complex are identified and a structural model for pure shear (coaxial strain) is preferred for the subhorizontal structures of the central structural domain. This is based on the identification of four phases of progressive deformation within the central structural domain that are interpreted to have occurred during or after peak metamorphism. Subvertical compression accounts for D1 and D2 deformation and D3 represents a transition from subvertical compression to pure shear east-west shortening. D4 structures are interpreted as post peak metamorphism east-west extension. U-Pb SHRIMP and LA-ICPMS analysis of zircon and monazite constrain peak metamorphism to c522 Ma. Thermobarometric calculations for peak metamorphic mineral assemblages yield average P-T estimations of 7.24 ± 0.61 kbar and 687 ± 28°C for the Leeuwin Complex. P-T calculations based on mineral rim compositions reflect retrograde conditions ~0.5 - 1 kbar less and ~50 - 100°C cooler than peak metamorphic conditions, implying that the Leeuwin Complex remained at mid-crustal levels after peak metamorphism. Analysis of chemical zoning in garnet suggests that after a prolonged period at mid-crustal depths, the Leeuwin Complex was exhumed rapidly. Sm - Nd isotopic data are presented for selected samples that reflect the two apparent protoliths of the felsic orthogneisses. Epsilon-Nd values are comparable to Sm - Nd isotope data from eastern Antarctica. Evolved Epsilon Nd is interpreted to indicate that the petrogenesis of the Leeuwin Complex protoliths involved partial melting of an enriched crustal source, is interpreted to be the Mesoproterozoic Naturaliste Plateau, which is considered to be a western continuation of the Albany-Fraser crust.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2008
Book chapters on the topic "Leeuwin Complex"
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White, Robert E. "Soil and the Environment." In Soils for Fine Wines. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195141023.003.0003.
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English has no exact translation for the French word terroir. But terroir is one of the few words to evoke passion in any discussion about soils. One reason may be that wine is one product of the land where the consumer can ascribe a direct link between subtle variations in the character of the product and the soil on which it was grown. Wine writers and commentators now use the term terroir routinely, as they might such words as rendezvous, liaison, and café, which are completely at home in the English language. French vignerons and scientists have been more passionate than most in promoting the concept of terroir (although some such as Pinchon (1996) believe that the word terroir has been abused for marketing, sentimental, and political purposes). Their views range from the metaphysical—that “alone, in the plant kingdom, does the vine make known to us the true taste of the earth” (quoted by Hancock 1999, p. 43)—to the factual: “terroir viticole is a complex notion which integrates several factors . . . of the natural environment (soil, climate, topography), biological (variety, rootstock), and human (of wine, wine-making, and history)” (translated from van Leeuwen 1996, p. 1). Others recognize terroir as a dynamic concept of site characterization that comprises permanent factors (e.g., geology, soil, environment) and temporary factors (variety, cultural methods, winemaking techniques). Iacano et al. (2000) point out that if the temporary factors vary too much, the expression of the permanent factors in the wine (the essence of terroir) can be masked. The difference between wines from particular vineyards cannot be detected above the “background noise” (Martin 2000). A basic aim of good vineyard management is not to disguise, but to amplify, the natural terroir of a site. Terroir therefore denotes more than simply the relationship between soil and wine. Most scientists admit they cannot express quantitatively the relationship between a particular terroir and the characteristics of wine produced from that terroir. Nevertheless, the concept of terroir underpins the geographical demarcation of French viticultural areas: the Appellation d’Origine Contrôllée (AOC) system, which is based on many years’ experience of the character and quality of individual wines from specific areas.
Conference papers on the topic "Leeuwin Complex"
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Craciunescu, Oana I., Bas W. Raaymakers, Alexis N. T. J. Kotte, Shiva K. Das, Thaddeus V. Samulski, and Jan J. W. Lagendijk. "A Case Study of Hyperthermia Induced Temperature Computations in Human Sarcomas Using Discrete Vasculature and Relative Perfusion Maps." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24417.
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Abstract One of the most important technical aspects in clinical hyperthermia is the ability to measure and/or simulate the 3D temperature fields. Related to that, an essential part is the way in which the complex heat transfer related to vasculature is described. We report here the results of a collaboration between the hyperthermia modeling groups from the UMC Utrecht, The Netherlands, and Duke UMC, USA. Utrecht’s hyperthermia group has developed a flexible, discrete vasculature thermal model (DIVA) (Kotte et al. 1996) that describes the heat transfer related to discrete vasculature. The vasculature was imaged using MR angiography. To account for the smaller vessels that are responsible for the significant bioheat transport, relative perfusion maps measured at Duke using dynamic enhanced-magnetic resonance imaging were used. Alternatively, the VAMP program (Van Leeuwen et al. 1998) was used to artificially generate smaller vasculature. The cases with discretized vasculature were compared to continuum models where either heterogeneous isotropic perfusion, or relative perfusion maps were used. All simulations were compared to MR thermometry data. The conclusion is that for tumors crossed by or near large vessels, a combination of large vessels discretization and perfusion maps yields temperatures that match very well the MR thermometry data.
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Végső, Ágota. "A mudança do papel da animação na disseminação da ciência." In LINK 2021. Tuwhera Open Access, 2021. http://dx.doi.org/10.24135/link2021.v2i1.74.g79.
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Esta proposta de pesquisa visa mapear possibilidades de animação na comunicação científica, com foco na divulgação científica pública sobre mudanças climáticas. As Mudanças Climáticas, parte da ciência multidisciplinar dos estudos ambientais, permitem pesquisar um complexo grupo de problemas. O plano de pesquisa é auxiliado pela experiência de uma colaboração com o TED-Ed, criando palestras em vídeos animados relacionados ao clima desde 2019, em coprodução com o The Animation Workshop, sediado na Dinamarca. Para cumprir este objetivo, a pesquisa irá entregar um Relatório do Estado da Arte sobre o uso atual da animação funcional em artigos de pesquisa e criar uma revisão sistemática sobre como os artigos descrevem verbal e visualmente os materiais animados usados. A revisão sistemática visa apontar as lacunas sobre o quão negligenciado é o processo de desenvolvimento da animação, e pela criação de uma linguagem comum na forma de princípios orientadores entre cientistas pesquisadores e profissionais de animação. Esta proposta deseja continuar a pesquisar sobre a mudança nestes artigos, de “se a animação facilita a aprendizagem” para “qual animação facilita a aprendizagem” (He 2020) e levá-la adiante definindo “como a colaboração da animação pode ser integrada no ensino de pesquisa”. A difusão da animação na educação e na divulgação pública da ciência explodiu devido ao desenvolvimento técnico dos últimos 10 anos. Recebeu um papel dominante não apenas nos currículos de sala de aula, mas também na educação on-line, reforçado pela pandemia de COVID-19 de 2020. O estudo teórico do papel da animação na aprendizagem passou por mudanças incríveis nos últimos 20 anos (Bétrancourt e Tversky 2000, Mayer 2002, Lowe 2003, Ploetzner e Lowe 2004, Bétrancourt 2005, Mayer 2009, Ploetzner e Lowe 2012, Ploetzner et al . 2013, Lowe e Schnotz 2014, Lowe e Boucheix 2016, He e Leeuwen 2019, Unsworth /ed./ 2020, Vistisen 2021). O papel da animação está mudando de uma arte aplicada para um parceiro colaborativo na disseminação da pesquisa. A pesquisa orientada para a prática é planejada para testar e ajustar a hipótese por meio de três estudos de caso, de que a integração da colaboração entre animadores e cientistas para produzir a disseminação da pesquisa visual para o público em geral sobre mudanças climáticas não apenas aumentaria o nível de compreensão do público, mas ajudaria os cientistas a estruturar a comunicação sobre seus processos de pesquisa. Os três estudos de caso são projetados para estabelecer a integração da colaboração da animação no ensino de pesquisa. O estudo de caso 1 é um plano de um curso intensivo para pesquisadores aprenderem sobre processos de comunicação visual animados, preparando um plano de um explicador animado. O estudo de caso 2 é uma oportunidade de colaboração entre animadores e cientistas para trabalhar com as comunidades locais, explicando suas pesquisas e criando disseminação visual usando animação. O estudo de caso 3 é um teste de como um instituto de pesquisa oferece oportunidades de colaboração de animação para permitir que os pesquisadores comuniquem suas descobertas de pesquisa. Todos os três estudos de caso têm como objetivo enfatizar o poder criativo e produtivo da colaboração entre contadores de histórias visuais e cientistas pesquisadores. Os locais e parceiros de colaboração ainda não foram fixados; experimentos exploratórios serão realizados durante o outono de 2021 para estabelecer as especificidades destes contextos de coleta de dados.