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 20 of 108 for “"Deglaciation"”.
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Speleothem-Based Hydroclimate Reconstruction of Northeastern Mexico Across the Last Deglaciation
As anthropogenic global warming intensifies, climate models predict more frequent drought conditions across Northeastern Mexico, but regional paleoclimate data is necessary to inform the spatial extent and severity of these droughts. In this thesis, we present a centennial-scale resolution record …
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An inverse approach to understanding benthic oxygen isotope records from the last deglaciation
Observations suggest that during the last deglaciation (roughly 20,000-10,000 years ago) the Earth warmed substantially, global sea level rose approximately 100 meters in response to melting ice sheets and glaciers, and atmospheric concentrations of carbon dioxide increased. This interval may …
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Late Wisconsinan deglaciation chronology of the Chenango River Valley and vicinity, New York
… is to reconstruct the history and manner of deglaciation in the Chenango River area of New York. To accomplish this objective it was necessary (1) to evaluate the planar-surface features within the Chenango River Valley and parts of the Susquehanna and Unadilla River valley with respect to …
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An inverse approach to understanding benthic oxygen isotope records from the last deglaciation
Observations suggest that during the last deglaciation (roughly 20,000-10,000 years ago) the Earth warmed substantially, global sea level rose approximately 100 meters in response to melting ice sheets and glaciers, and atmospheric concentrations of carbon dioxide increased. This interval may …
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Inferring ocean circulation during the Last Glacial Maximum and last deglaciation using data and models
Since the Last Glacial Maximum (LGM, ~ 20,000 years ago) air temperatures warmed, sea level rose roughly 130 meters, and atmospheric concentrations of carbon dioxide increased. This thesis combines global models and paleoceanographic observations to constrain the ocean’s role in storing and …
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Late Devensian ice sheet dynamics and the deglaciation of the Hebridean shelf, western Scotland, UK
The reconstruction of past ice sheet dynamics can shed a light on long-term ice sheet activity, and in turn provide constraints on the response of modern ice sheets to climate change. The Hebrides Ice Stream (HIS) flowed across part of the western Scottish shelf to the shelf-break during the last …
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The Weichselian in southern Sweden and southwestern Baltic Sea : glacial stratigraphy, palaeoenvironments and deglaciation chronology
… and Late Weichselian ice advances and subsequent deglaciations. The main study area was Kriegers Flak in the southwestern Baltic Sea where pre-Late Weichselian sediments were identified. We suggest that the lowermost till on Kriegers Flak, dated to the Early or Middle Weichselian, was deposited …
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Inferring ocean circulation during the last glacial maximum and last deglaciation using data and models
Since the Last Glacial Maximum (LGM, ~ 20,000 years ago) air temperatures warmed, sea level rose roughly 130 meters, and atmospheric concentrations of carbon dioxide increased. This thesis combines global models and paleoceanographic observations to constrain the ocean's role in storing and …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary 231Pa/230Th
… the ocean’s role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a means of age-screening deep-sea corals for further study. Based on age survey results, I selected forty corals from the Drake Passage and thirteen from the Reykjanes Ridge off …
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The Evolution of the El Niño-Southern Oscillation and Tropical Pacific Climate Across the Last Deglaciation
… under different climate regimes across the last deglaciation. I combine these results with Monte Carlo simulations of hypothetical ENSO change and robust, nonparametric statistics to reconstruct “snapshots” of past ENSO activity from the Holocene, the Last Glacial Maximum (LGM), and the abrupt …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary ²³¹Pa/²³⁰Th
… the ocean's role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a means of age-screening deep-sea corals for further study. Based on age survey results, I selected forty corals from the Drake Passage and thirteen from the Reykjanes Ridge off …
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Subsurface Geophysical Investigations of Oneida Lake Ny: Insights Into Ice Sheet Processes and Deglaciation At Termination I
… and enhance calving processes and can accelerate deglaciation or serve as corridors of easy ice sheet readvance. The deepest section of a basin likely contains the most complete and highest resolution proglacial lake sequence. High-resolution proglacial lake records can be used to reconstruct ice …
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Late quaternary valley fill sediments in the River Tyne valley: Understanding late Devensian deglaciation and early postglacial response in northern England
… landform interpretations. The story of deglaciation in Britain is a complex one and the work here illustrates that we are far from understanding the behaviour of the ice during the last glacial period, and certainly there is not a one model fits all solution.
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Paleoceanographic variability on a millennial scale: a high resolution record of the latest deglaciation from the Blake Outer Ridge, western North Atlantic
… variabilty in paleocirculation during the latest deglaciation is demonstrated for the Blake Outer Ridge, Western North Atlantic. Cores KNR140-2 GGC-39 from 2975 meters and GGC-40 from 2924 meters show correlative oscillations in Cibicidoides and Uvigerina abundances, and δ180 from Globigerinoides …
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Paleoceanographic variability on a millennial scale: a high resolution record of the latest deglaciation from the Blake Outer Ridge, western North Atlantic
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.
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Effects of Glaciation on Volcanism in Iceland
… eruption rates in Iceland during the last deglaciation increased 5--30 fold from the steady-state rates. This has been understood by the unloading of ice, which increases the decompression rates in the mantle, causing enhanced mantle melting rates. However, existing theoretical work cannot …
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The provenance of the norber erratics, and the formation of post-devensian-deglaciation pedestal rocks with carboniferous limestone pedestals in England, Ireland and Wales
… Yorkshire, and the origins of a post-Devensian-deglaciation landform, pedestal rocks with Carboniferous limestone pedestals in England, Ireland and Wales. Investigations to determine the provenance of the Norber erratics were undertaken in a study area of about 2000ha. Mapping erratic dispersal …
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Meltwater injections and their impact on Atlantic meridional overturning circulation and climate during the time period of Heinrich Event 1 and the last deglaciation
… (mwp-1a) and the climate<br/>history of the last deglaciation remains a subject of debate. By combining the<br/>GRIP ?18O ice core record on the new Greenland Ice Core Chronology 2005<br/>(GICC05) timescale with the U/Th-dated Barbados coral record, it is<br/>conclusively derived that mwp-1a did …
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