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 17 of 17 for “"multi-proxy approach"”.
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Middle Miocene carbon cycle dynamics: A multi-proxy approach
The development of permanent, stable ice sheets in Antarctica happened during the middle Miocene, about 14 million years ago (Flower and Kennett, 1995; Zachos et al., 2001). The middle Miocene therefore represents one of the distinct phases of rapid change in the transition from the “greenhouse” of …
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Holocene development of Lake Lögurinn and Eyjabakkajökull : a multi-proxy approach
… the northeastern part of Vatnajökull. Using a multi-proxy approach, proxies for glacial meltwater variability and surge periodicities of Eyjabakkajökull have been examined to infer its Holocene development. In addition, changes in sediment transport from a non-glaciated catchment adjacent to …
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A multi-proxy approach to investigating the latest Holocene (~4,500 yrs. BP) vegetational history of Catahoula Lake, Louisiana
<p>A multi-proxy investigation of sediments examined from Catahoula Lake, Louisiana has provided a record of late-Holocene vegetational changes, related to both hydrology and climate. This study integrates data from phytoliths, pollen, stable isotopes, magnetic susceptibility, and core sediment …
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Social Organisation And Change In Bronze Age South Asia: A multi-proxy approach to urbanisation, deurbanisation and village life through phytolith and macrobotanical analysis
… Contrary to previous suggestions, a range of multi-cropping strategies were seen from the beginning of occupation at all settlements. A slight trend towards increased proportions of millet, which is viewed as being arid-adapted, was seen over time, but no drastic switch to these crops was …
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Reconstruction of the Late and Mid-Pleistocene climate and landscape history in SE-Central Europe - A paleopedological and geochemical multi-proxy approach in loess-paleosol studies.
… the region by a paleopedological – geochemical multi-proxy approach. Furthermore, methodological investigations aim to evaluate the validity of various paleoenvironmental proxies especially geochemically based weathering indices, as well as biomarker and stable isotope approaches in LPSS …
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Ocean circulation and carbon cycle dynamics in the Pacific Southern Ocean during Late Pleistocene interglacials
… for the current interglacial period. Applying a multi-proxy approach, this thesis investigates CDW upwelling dynamics using planktic and benthic foraminiferal δ13C, bottom water oxygenation using foraminiferal U/Mn ratios, bottom water temperature using benthic foraminiferal Mg/Ca ratios, sea …
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A 1400 Year Multi-Proxy Record of Hydrologic Variability in the Gulf Of Mexico: Exploring Ocean-Continent Linkages During the Late Holocene
… spanning the last 1400 years and utilizes a multi-proxy approach incorporating organic and inorganic geochemical analyses to define intervals of varying continental inputs and to assess changes in the moisture balance (E-P) within the Gulf of Mexico.
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The Hydrology of the Carroll Cave-Toronto Springs System: Identifying and Examining Source Mixing through Dye Tracing, Geochemical Monitoring, Seepage Runs, and Statistical Methods
… contributions by the end members. By using a multi-proxy approach of dye tracing, seepage runs, and geochemistry for the individual springs, the source waters and pathways for the springs at Toronto Springs have been identified.</p>
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The Evolution and Impact of Weddell Sea Deep Water
… sourced from the Weddell Sea is examined with a multi-proxy approach to obtain a thorough understanding of the sedimentation dynamics under various climatic boundary conditions. This is possible through reconstruction of changes in productivity (by use of Th normalized opal flux, biogenic Ba), …
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Testing the late-Holocene climate signal from ombrotrophic bogs in southernmost Chile and the Falkland Islands: a multi-proxy, multi-profile and multi-site approach
… Islands, to form a regional comparison. A multi-proxy approach was used, combining both palaeoecological and stable isotopic methods. At one site, Karukinka, intra-site replicability was tested across three profiles located along a microtopographical gradient. A low number of statistically …
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Reconstructing late Holocene Artctic climate change using high resolution sediment records from Simpson Lagoon, Alaska and the Colville River alluvial valley
… sourcing to the lagoon, determined using a multi-proxy approach (i.e., granulometry, elemental analysis, clay mineralogy), broadly corresponds with temperature fluctuations, indicating relative increases in fluvial sediment discharge during colder intervals and decreased river …
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Environmental change recorded in physical and geochemical proxies over the Last Glacial Cycle from two Northland, New Zealand dune lakes: Lake Kanono and Lake Kai Iwi
… Lake Kai Iwi in Northland, New Zealand. Using a multi-proxy approach incorporating physical, sedimentological, geochemical, and μ-XRF elemental datasets, changes were identified in wind intensity and precipitation that likely correspond to regional and global climatic shifts associated with …
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Living near permanent water in the upper Murray-Darling Basin Implications from the micromorphology of buried soils near artesian springs
… drylands for millennia. This thesis implements a multi proxy approach to reveal evidence of oscillating humid and dry conditions from ~55 Ka to ~0.7 Ka. From 55.9 Ka ± 5.9 Ka BP, humid conditions dominated the region which slowly transitioned into cold frosty dry conditions toward the commencement …
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Paleoenvironmental changes in the Black Sea region during the last 26,000 years : a multi-proxy study of lacustrine sediments from the western Black Sea
Paleoenvironmental records provide ample information on the Late Quaternary climatic evolution. Due to the great diversity of continental mid-latitude environments the synthetic picture of the past mid-latitudinal climate changes is, however, far from being complete. Owing to its significant size …
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Centennial-scale reconstructions of mountain glacier fluctuations during the Holocene, West Greenland
… to climate change. Here, I employ a novel multi-proxy approach that combines glacier-fed lake sediments, radiocarbon dating of in situ moss that recently emerged along retreating ice cap margins, and cosmogenic in situ 10Be and 14C surface-exposure dating to reconstruct centennial-scale …
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Earth’s oceanic oxygen history from Phanerozoic to Pleistocene glacial cycles: insights from the carbonate iodine-to-calcium proxy
… biology/environment comparison. I used a novel proxy, the iodine-to-calcium ratio (I/Ca) in carbonate rocks and planktic microfossils, which can track oxygen changes over a range of values where most modern marine animals are sensitive, i.e., at higher oxygen levels rather than euxinia …
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Thermokarst dynamics in central-eastern Beringia
… lake development and how are they reflected in proxy records? 3. How did, and still do, thermokarst dynamics contribute to the inventory and properties of organic matter in sediments and the carbon cycle? Methods applied in this study are based upon a multi-proxy approach combining …