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 209 for “"ice-sheet"”.
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Variational Methods in Ice Sheet Modelling
A complete simulation of flowing ice requires knowledge of both the fundamental physical principles that govern the stress and energy balances and a framework for assimilating data into a model to help estimate unknown parameters. Modelling ice is complex, due to the large spatial extent of ice …
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Variational Methods in Ice Sheet Modelling
A complete simulation of flowing ice requires knowledge of both the fundamental physical principles that govern the stress and energy balances and a framework for assimilating data into a model to help estimate unknown parameters. Modelling ice is complex, due to the large spatial extent of ice …
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Monitoring the Antarctic Ice Sheet From Space
The Antarctic ice sheet is a geophysically - and in an age of growing concern about global warming, geopolitically - important portion of Earth. The composition and dynamics of the Antarctic ice sheet influence global climate patterns, global sea level and the planet's radiation budget. Recent …
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Influence of meltwater on Greenland Ice Sheet dynamics
Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production observed over recent decades and predicted into future decades, …
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Supraglacial lake evolution on the Greenland Ice Sheet
… form annually on the surface of the Greenland Ice Sheet around Paakitsoq, north of the Jakobshavn Isbrae outlet glacier. The lakes are ephemeral, drain through moulins or crevasses at their bed throughout the melt season, and deliver large volumes of water to the subglacial hydrological system. …
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Modelling the Hydrology of the Greenland Ice Sheet
… recognition that the hydrology of the Greenland Ice Sheet plays an important role in the dynamics and therefore mass balance of the ice sheet. Understanding the hydrology of the ice sheet and being able to predict its future behaviour is therefore a key aspect of glaciological research. To date, …
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Investigating fast flow of the Greenland Ice Sheet
… dynamic response of a faster-flowing Greenland Ice Sheet to climate change is modulated by feedbacks between ice flow and surface meltwater delivery to the basal environment. While supraglacial melt processes have been thoroughly examined and are well constrained, the response of the englacial …
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Influence of meltwater on Greenland Ice Sheet dynamics
Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production observed over recent decades and predicted into future decades, …
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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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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… has led to a significant increase in Greenland ice sheet (GrIS) melt and runoff since 1990, resulting in escalated export of fresh water and associated sediment to the surrounding North Atlantic and Arctic Oceans. Similar to alpine glacial systems, surface meltwater on ice sheet surface drains …
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The Antarctic Peninsula ice sheet since the Last Glacial Maximum
… addresses the size and configuration of the ice sheet during the Last Glacial Maximum (LGM), an important issue for quantifying post-LGM sea level rise and providing boundary conditions for General Circulation Models. Geomorphic features analyzed in multibeam swath bathymetry and seismic data …
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IMPLEMENTATION OF A VERTICALLY INTEGRATED ICE SHEET MOMENTUM BALANCE MODEL
A new high-fidelity ice sheet momentum balance model meant for inclusion in the Glimmer community ice-sheet model is presented. As a component of the Community Earth Systems Model the newly developed momentum balance will directly benefit from ice/ocean and ice/atmosphere coupling efforts occurring …
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IMPLEMENTATION OF A VERTICALLY INTEGRATED ICE SHEET MOMENTUM BALANCE MODEL
A new high-fidelity ice sheet momentum balance model meant for inclusion in the Glimmer community ice-sheet model is presented. As a component of the Community Earth Systems Model the newly developed momentum balance will directly benefit from ice/ocean and ice/atmosphere coupling efforts occurring …
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Triad Interactions among Surface Waves Propagating through an Ice Sheet
… when ocean waves propagate into a thin floating ice sheet. Using multiple-scale perturbation analysis verified against regular perturbation for short distances past the ice edge, we obtain theoretical predictions of the wave amplitude evolution as a function of distance travelled past the ice …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… has led to a significant increase in Greenland ice sheet (GrIS) melt and runoff since 1990, resulting in escalated export of fresh water and associated sediment to the surrounding North Atlantic and Arctic Oceans. Similar to alpine glacial systems, surface meltwater on ice sheet surface drains …
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Antarctica's Geologic and Ice Sheet History from Isotopic Sedimentary Provenance Studies
… geology obscured by the more than 98% ice cover of the continent. These insights into the geology of East Antarctica in turn provide characterization of sedimentary source areas, the knowledge of which can be applied to sediment provenance studies of ice rafted detritus (IRD) and thus …
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Microwave Remote Sensing of the Greenland Ice Sheet: Models and Applications
… of global climate change on the Greenland ice sheet. This dissertation focuses on refining methods for applying microwave data in Greenland studies by using new simple theoretical and empirical models to investigate (1) azimuth anisotropies in the data, (2) the microwave signature of the …
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South-east Greenland Ice Sheet short term response to environmental conditions
… be robust. Expanding this study over the whole ice sheet has been shown to be feasible and would depict margin changes in unprecedented spatio-temporal detail.
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ARRAY PROCESSING TECHNIQUES FOR ESTIMATION AND TRACKING OF AN ICE-SHEET BOTTOM
Ice bottom topography layers are an important boundary condition required to model the flow dynamics of an ice sheet. In this work, using low frequency multichannel radar data, we locate the ice bottom using two types of automatic trackers. First, we use the multiple signal classification (MUSIC) …
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