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 “"Ice Streams"”.
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Relating surface and bed properties of Antarctic ice streams
Theoretical models predict that fast-flowing ice streams transmit information about their bedrock topography most efficiently to the surface for two distinct windows of length-scales. Previous studies have shown a good transfer for basal undulations with wavelengths longer than 103 ice thicknesses. …
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The Response of Antarctic Ice Streams to Tidal Forcing
The majority of the ice flowing from the Antarctic interior makes its way to the ocean through fast-flowing ice streams, or glaciers. Understanding what controls the speed of these streams is extremely important in predicting the overall response of ice sheets to changing climatic conditions, and …
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The influence of subglacial hydrology on the flow of West Antarctic ice streams
… hydrology is known to influence the flow of ice. However, difficulty in accessing the base of large ice sheets has made determining the interaction between ice streams, basal sediment and water difficult to discern. The aim of this thesis is to determine the influence of subglacial hydrology …
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Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… 10-kyr deglaciation. Since its discovery in ice cores recovered from Greenland, the rapid deglaciation has proven mysterious. I present a novel explanation for this phenomenon, wherein the deglaciation of the Laurentide ice sheet is accelerated by the rapid collapse of marine-terminating ice …
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Reflection seismic investigations of the Canadian Beaufort Sea margin, Arctic Ocean
… troughs, representing locations of former ice streams draining a 1000 km-long section of the Laurentide Ice Sheet (LIS), are examined: the Mackenzie, Amundsen Gulf and M'Clure Strait systems. These palaeo-ice streams operated during the last, Late Wisconsinan glacial maximum, as well as …
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Glacial Geomorphology of southern Alberta, Canada
… from the Last Glacial Maximum three terrestrial ice streams within the south western sector of the Laurentide Ice Sheet competed and coalesced in southern Alberta; the High Plains Ice Stream (HPIS), Central Alberta Ice Stream (CAIS) and the east lobe. The ice streams are characterised by smoothed …
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The Quaternary evolution of the mid-Norwegian continental margin
… number of cross-shelf troughs produced by past ice streams that periodically drained the growing and decaying Fennoscandian Ice Sheet since approximately 1.5 M.y. ago. The development and intensification of focused ice flow from about 0.8 M.y. ago resulted in enhanced erosion on the shelf and …
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The Topography and Flow of the Antarctic Ice Sheet
… the form and topography of the Antarctic ice sheet and to relate these to the physical processes of ice flow and basal conditions. Topographic roughness typically increases towards the thin ice of coastal reg ions as surface undulation wav el eng ths decrease and amplitudes increase. …
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Subsurface Geophysical Investigations of Oneida Lake Ny: Insights Into Ice Sheet Processes and Deglaciation At Termination I
<p>Reconstructing the retreat of the Laurentide Ice Sheet (LIS) provides insight into understanding end-Pleistocene climate, a critical set of boundary conditions prior to the onset of Holocene climates that were optimal for human dispersal and societal growth. Constraining ice sheet dynamics, …
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Submarine Geomorphology of the Continental Shelves of Southeast and Southwest Greenland from Olex Data
Mass loss from the Greenland Ice Sheet remains the largest uncertainty in projections of sea level rise for the 21st century. Reconstructing the former history of the Greenland Ice Sheet during the Late Quaternary provides important constraints on how the ice sheet will behave in response to future …
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Seismic-stratigraphic analysis of shelf-margin delta/slope fan and basin floor fan on high-latitude and middle-latitude margins (Ross Sea, Weddell Sea and Alabama/West Florida shelf): Paleoclimatic and eustatic implications
… fans were strongly controlled by the location of ice streams. This point-source component of stratal architecture contrasts with the implicit line-source assumption that dominates recent thinking of Antarctic stratal development. Point-sourced trough mouth fans are relatively stable features, but …
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Reconstructing ice dynamics in the central sector of the last British-Irish Ice Sheet
… and Scottish borders) of the last British-Irish Ice Sheet exhibits a palimpsest glacial geological and geomorphological signature characteristic of multi-phase ice flow and ice-marginal fluctuations. Despite its influential position at the heart of the British-Irish Ice Sheet, sourced from major …
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Glacial Geomorphology of the Eastern Antarctic Peninsula Shelf
During the last glacial maximum, grounded ice from the expanded Antarctic Peninsula Ice Sheet extended across the continental shelf. Grounded and flowing ice carved a distinctive array of glacial geomorphic features into the seafloor, which were gradually exposed as the ice pulled back. The recent …
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How deformation influences the flow and fracture of glacier ice
Most of the mass loss from the Antarctic Ice Sheet (AIS) occurs by dynamic flow of ice from the interior of the ice sheet to the margins, where the ice flows on the ocean, ultimately breaks apart into icebergs, and melts into the ocean. Due to anthropogenic-caused shifts in the climate system, many …
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Terrestrial cosmogenic nuclide dating applied in glacial stratigraphy and transportation studies on a greenfield exploration project in Kaarestunturi, Finnish Lapland
… that the area has not hosted pronounced ice streams during recent stadials, however, it has experienced different types of glacial transportation. Till fabric analysis shows that the Kaarestunturi and adjacent Kiimajänkä have been subjected to both pronounced and indecisive ice flow …
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Remote Sensing Studies of Svalbard Glaciers
… aspects of the morphology and dynamics of the ice caps of Nordaustlandet, Svalbard. Data collection, methods of reduction and errors are discussed. Three principal topics are examined. First, as a preliminary to comprehensive radio echo sounding operations over Nordaustlandet, the ability of 60 …