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 “"climate reconstructions"”.
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Clams and climate: implications for measuring seasonality in the marine bivalve, saxidomus gigantea
… the region. The effects of changes in regional climate patterns, as well as human responses to such change, however, can exhibit great variability locally. In the Kodiak archipelago in the Gulf of Alaska, changing environmental conditions, population growth, technological transitions, and …
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The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application
… the associated consequences for biomarker-based climate reconstructions. In Chapters 2 and 3, coupled molecular isotope mass balances demonstrate that the amount of petrogenic OC residing on the Beaufort Shelf (Arctic Ocean) and the Eel River Margin (coastal California) has been previously …
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Geochemistry of slow-growing corals : reconstructing sea surface temperature, salinity and the North Atlantic Oscillation
… provides a record of decadal-to-centennial scale climate variability. The coral was collected live, and sub-annual density bands seen in x-radiographs delineate cold and warm seasons allowing for precise dating. Coral skeletons incorporate strontium (Sr) and calcium (Ca) in relative proportions …
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Application of a New Tree-Ring Based Drought Reconstruction Method at Multiple Forest Sites Across Indiana, U.S.A.
… using multiple co-occurring species (MCOS) in a climate reconstruction model compared to a single species (SS) in four old-growth forests in Indiana: Pioneer Mothers Memorial Forest (PM), Donaldson Woods (DW), Hoot Woods (HW), and Lilly Dickey Woods (LD). The objectives of this study were to [1] …
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Geochemistry of slow-growing corals : reconstructing sea surface temperature, salinity and the North Atlantic Oscillation
… provides a record of decadal-to-centennial scale climate variability. The coral was collected live, and sub-annual density bands seen in x-radiographs delineate cold and warm seasons allowing for precise dating. Coral skeletons incorporate strontium (Sr) and calcium (Ca) in relative proportions …
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Evaluating the efficacy of Tridacna derasa and Hippopus hippopus for measuring ENSO signatures in Palau
Tridacna shells are valuable archives in paleoclimate research due to their incremental growth bands, which record environmental conditions such as sea surface temperature (SST) and salinity through variations in oxygen isotopes (δ18O). Their potential for reconstructing past climate variability …
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The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application
… the associated consequences for biomarker-based climate reconstructions. In Chapters 2 and 3, coupled molecular isotope mass balances demonstrate that the amount of petrogenic OC residing on the Beaufort Shelf (Arctic Ocean) and the Eel River Margin (coastal California) has been previously …
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Paleoclimate and paleoecology of Miocene Eastern African primate habitats : a multiproxy approach.
Reconstructing Miocene climate and ecosystem in eastern Africa is essential for understanding the environmental and geological contexts in which early primates evolved. Particularly, correlations between leaf size, shape, temperature, and precipitation have become a widely used tool for …
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Advances in understanding melt-affected firn and ice cores from the polar regions
… affect the preservation of numerous ice-core climate proxies. The age scale development for a new firn core from Young Island exemplifies the challenges and potential of records impacted by melt. In this context, my PhD research contributes to a more comprehensive understanding and new avenues …
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Exploring high-resolution carbon isotopes in archaeological charcoal as a rainfall seasonality proxy
… interglacial cycles is crucial for both regional climate reconstructions and interpreting behavioural variability in the South African Later Stone Age (LSA) archaeological record. However, several key palaeoarchives employed to reconstruct rainfall seasonality during the Late Pleistocene are …
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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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Towards a coupled δ18O sugar and δ2H n-alkane approach in paleoclimate research
… are increasingly used in paleohydrological and -climate reconstructions. However, previous studies found it challenging to disentangle the effects of past changes in δ18O and δ2H of precipitation (δ18Oprec and δ2Hprec, respectively) and changes due to evapotranspirative enrichment of leaf water. …
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Dendrochronological investigations of living and relict yew trees from eastern England
Understanding how the Earth’s climate system has varied in the past is essential for contextualizing its current state and predicting future climate changes. However, for most of the planet, instrumental measurements of temperature and precipitation began only in the early 20th century and thus do …
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Hydrology across scales : sensitivity of East African lakes to climate changes
… studied to better understand the influence of climate change on hydrological systems. The exceptional sensitivity of these rift lakes, however, is both a challenge and an opportunity when trying to reconstruct past climate changes from changes in the hydrological budget of lake basins on …
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Reconstructing Past Population Dynamics and Movements from Genomic and Environmental Data
… with other lines of evidence, like global climate reconstructions, to reconstruct the past using ecological models. This thesis aims to explore new computational methods to reconstruct the past of different species with various data availability, and to answer the ecological questions …
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Changes in monsoonal precipitation and atmospheric circulation during the Holocene reconstructed from stalagmites from Northeastern India
… witnessed a vast advent of stalagmites as palaeoclimate archives. The multitude of geochemical and physical proxies and a promise of a precise and accurate age model greatly appeal to palaeoclimatologists. Although substantial progress was made in speleothem-based palaeoclimate research and …