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 16 of 16 for “"Quaternary climate."”.
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
Characterizing global and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
Characterizing global and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine …
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Lake-level fluctuations and Late Quaternary climate change in the Central Kenya Rift
Diese Arbeit beschäftigt sich mit der Rekonstruktion von Klima in historischen Zeiten im tropischen Ostafrika. Nach einer Übersicht über die heutigen klimatischen Bedingungen der Tropen und den Besonderheiten des ostafrikanischen Klimas, werden die Möglichkeiten der Klimarekonstruktion anhand von …
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Reconstructing Australia’s late Quaternary climate from the geochemistry of lake sediments and snail shells
Australia’s climate is influenced by ocean-atmosphere interactions in the adjacent Indian, Pacific, and Southern oceans, as well as major atmospheric circulation patterns. Australian climates exhibit high inter-annual variability, arising in part from complex interactions between these drivers. …
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A seascape genetics approach to exploring the phylogeographic response of marine fishes to late Quaternary climate change
… will flourish or face extinction under a new climate regime is largely determined by its dispersal ability, its adaptive capacity or some combination of these processes. These processes have also played important roles in the evolutionary histories of species, ultimately shaping their …
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Late quaternary climate changes and landscape evolution in the Northwest Himalaya : geomorphologic processes in the Indian Summer Monsoon Domain
The India-Eurasia continental collision zone provides a spectacular example of active mountain building and climatic forcing. In order to quantify the critically important process of mass removal, I analyzed spatial and temporal precipitation patterns of the oscillating monsoon system and their …
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The late quaternary history of Southern hemisphere mediterranean climate regions in the Western Cape, South Africa, and Southwestern Australia
… investigate the complex interaction between Late Quaternary climate change, the influence of fluctuating sea levels and the impact of human interaction with the environments in question and provide a regional picture of these interactions.
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Tracing hydrological millennial-scale cycles in the late Quaternary of the Cariaco Basin and the southern Gulf of Cádiz using coccoliths and dinoflagellate cysts
Climate fluctuations in tropical to subtropical regions are coupled to hydrological changes. The reconstruction of these hydrological changes during rapid late Quaternary climate oscillations is crucial for climate change study. The present study demonstrates that coccoliths and dinoflagellate …
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Phylogenetics of North American Psoraleeae (Leguminosae): Rates and Dates in a Recent, Rapid Radiation
… rates, diversification rates, and the impact of climate change, past and present, on diversification of NAm Psoraleeae. Results suggest the group has undergone a recent, rapid radiation. Rates of molecular evolution are fast, relative to other Legume lineages. Topological and temporal methods …
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Tectonic and Climatic Controls on Continental River Systems
… I address questions of how rivers respond to climate, geologic substrate, and tectonics across scales, how landscape disequilibrium results from changing tectonic and climatic forces, and implications of landscape evolution for past human settlement. In the first chapter, I use a process model …
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Resolving abrupt palaeoenvironmental changes in a lake sediment sequence from Ioannina, northwest Greece
… of our understanding of ecological responses to Quaternary climate change. Lake Ioannina (NW Greece) is one such archive, with a vegetation record which spans multiple glacial-interglacial cycles. This PhD builds upon earlier work at Ioannina, seeking to characterise last glacial millennial-scale …
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Insights into Glacial Terminations from a South Atlantic Perspective
… feedbacks within the Earth\textquoteright s climate system act to amplify these small external forcings tipping the Earth from a cold glacial climate state to a warm interglacial climate state. A key question in Quaternary climate science is understanding which feedbacks are important in …
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Reconstruction of aspects of Northern New Zealand paleoclimate over the last 200 ka using laminated Auckland maar lake sequences
… age control for the interpretation of paleoclimate signals and variability as recorded in the lacustrine sequence is exemplified by the reassessment of available pollen data that span the upper ~ 9.4 m of the Onepoto Maar record. The new On18 age model enabled the interpretation of proxy …
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Analysis of deposition, erosion, and landscape stability during the late Quaternary using multi-proxy evidence from Owl Creek, Central Texas, USA.
… of fluvial deposition and incision preserved in Quaternary sediments are valuable archives of environmental change, but have been understudied in low order streams in central Texas, USA. An exposure along Owl Creek a tributary of the Brazos River was examined using geological and pedological …
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LANDSLIDE INVESTIGATION IN THE RÍO AGUAS CATCHMENT, SOUTHEAST SPAIN
… Spain, which has an arid to semi-arid climate and is periodically affected by both earthquake and flash-flood activity. Through a combination of aerial photographic interpretation (API) and field verification and mapping, over 300 landslides have been mapped and documented. These data …
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Late Quaternary landscape evolution and environmental change in Charwell Basin, South Island, New Zealand
… of the Charwell River, and a series of late Quaternary loess-mantled alluvial terraces and terrace remnants that have been uplifted and translocated from their sediment source due to strike-slip motion along the Hope Fault which bounds the basin to its immediate north. The aim of this study …