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 39 for “"ice-shelves"”.
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The flow and fracture of Antarctic Ice Shelves
This thesis explores the deformation of glacier ice, with an aim of deriving insights into its flow and fracture through satellite remote sensing methods. Glaciers deform through the driving force of their own weight and display dramatic responses to both external forcing, such as changes in …
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The Flow Dynamics and Buttressing of Ice Shelves
… I explore the flow dynamics associated with ice shelves confined within channels and the buttressing they provide to grounded ice. Ice shelves are the floating extensions of ice sheets and act as the interface between the ice sheet and the ocean. They form when ice flows out from the interior …
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The Flow and Fracture of Antarctic Ice Shelves
This thesis explores the deformation of glacier ice, with an aim of deriving insights into its flow and fracture through satellite remote sensing methods. Glaciers deform through the driving force of their own weight and display dramatic responses to both external forcing, such as changes in …
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Ocean mixing and heat transport beneath Antarctic ice shelves
Ocean-driven melting of floating ice shelves is currently the main process controlling Antarctica’s contribution to sea level rise. However, despite major advances in the study of ice shelf-ocean interaction over recent decades, key processes governing basal melting remain poorly understood, …
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Investigating North Greenland ice shelves and their response to warming climate
The Greenland Ice Sheet has been losing mass at an increasingly rapid pace since the mid 1990s, which is forecast to accelerate further into the coming century. This mass loss is translated directly into global mean sea level rise, with severe consequences for coastal communities around the world …
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A New Method for Melt Detection on Antarctic Ice-Shelves and Scatterometer Calibration Verification
… of surface melt and freeze in the Antarctic ice-shelves. The normalized radar backscatter (sigma-0) and backscatter polarization ratio (PR) are used in the maximum likelihood estimation of the ice-state. This method is used to infer the daily ice-surface conditions for 25 selected study …
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Investigating the surface hydrology of Antarctic ice shelves using remote sensing and machine learning
… is widespread across many of Antarctica’s ice shelves and can contribute towards ice-shelf instability and potential collapse via hydrofracture or militate against potential ice-shelf instabilities by forming drainage systems that export surface meltwater off the ice-shelf edge. It is …
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An investigation into pixel- and object-based classification approaches for the detection of dolines on the surface of Antarctic ice shelves
Ice dolines are distinctive bowl-shaped depressions observed on many Antarctic ice shelves. They are interpreted as the results of meltwater ponds at or near the surface draining into or through the shelf column. Dolines are characterised by a typical morphology of a raised rim surrounding the …
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Quantification of the Impact of Supraglacial Lakes and Slush on Surface Energy Balance of Ice Shelves: Nivlisen Ice Shelf, East Antarctica
… and slush are prevalent features of Antarctic ice shelf surface hydrology and efficiently transfer energy to the ice by melt-albedo feedbacks (Dell et al., 2020; Moussavi et al., 2020). There have been few efforts to quantify the energy exchanges between supraglacial meltwater, atmosphere, and …
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Sea-ice and ice-shelf variability in the Amundsen Sea Embayment, West Antarctica
Global sea-level rise contributed by Antarctic ice-mass loss could soon outpace all other sources. The ice-mass-loss signal of the Antarctic Ice Sheet is dominated by the Amundsen Sea Embayment (ASE) in West Antarctica. Ice shelves in the ASE influence the ice-mass-loss rates of the Antarctic Ice …
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Satellite Remote Sensing Investigations into Changing Ice-shelf Extents in the Eastern Weddell Sea Sector of Antarctica
Satellite observations of ice-shelf collapse and related ice-mass drawdown from the Antarctic Peninsula over the past > 3 decades have been unambiguously linked to changes in atmospheric and oceanic processes as a result of anthropogenic climate change. Therefore, contemporary glaciological …
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Evolution of basal channels, ice fracture, and surface meltwater, and implications for the stability of the Roi Baudouin Ice Shelf
… to reduce the structural integrity of ice shelves as a result of localised ice-shelf thinning, which induces spatially heterogeneous regions of intensified flexural stresses that encourage fracture initiation and possible subsequent calving. Further to this, the formation of surface …
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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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Ice-ocean interactions beneath the north-western Ross Ice Shelf, Antarctica
Basal melting of ice shelves is causing accelerating mass loss from the Antarctic Ice Sheet, yet the oceanographic processes which drive this are rarely observed. This thesis uses new observations from phase sensitive radar and moored oceanographic instruments to describe the processes which drive …
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Putting Lipstick on a PIG: Modeling Pine Island Glacier (PIG) Shear Margin Collapse with Compressive Arch Failure and Observations
… Glacier (PIG) drains 10\% of the West Antarctic Ice Sheet and has undergone rapid change in the observational record, contributing to uncertainty in sea level rise projections. The Pine Island Ice Shelf (PIIS), which provides a key buttressing force that slows the flux of ice across the grounding …
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Antarctica: A Geography of the Sacred
… outer ring or structure, the minimalist ice shelves and Polar Plateau corresponding the prayer/assembly hall as well as to the difficulties that must be crossed along the way, and the centre or axis corresponding to the Geographic South Pole. Through the combination of this tectonic …
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Bridging Simple Models and Observations of the Flexure Zone around Antarctica
This study evaluates whether the length of ice flexure zones in Antarctica can be used to infer the thickness of the ice and the effective Young’s modulus using a 1-D linear elastic beam bending model. The ice flexure zone is defined as the transition region between the grounded ice sheet and the …
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Impact Analysis and Design Development for Air-Dropped Antarctic Seismo-Geodetic Ice Penetrator
Existing measurement tools for ice shelves and other glaciated regions have limited capability to measure dynamic events in remote areas. The Seismo-Geodetic Ice Penetrator (SGIP) offers a method for rapid deployment of a broadband seismometer and Global Navigation Satellite System (GNSS) …
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ANTARCTIC GLACIAL CHRONOLOGY REFLECTED IN THE OLIGOCENE THROUGH PLIOCENE SEDIMENTARY SECTION IN THE ROSS SEA
Over 24% of the ice surface area covering East and West Antarctica drains into the Ross Sea and supplies the Ross Ice Shelf. The dominant proportion of this ice originates from the West Antarctic subcontinent. Thus, any change in the glacial regime in West Antarctica, and to a lesser extent East …
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In situ temperature monitoring of the McMurdo Ice Shelf and ice shelf cavity by fiber-optic distributed temperature sensing
Ice shelf basal melt rates represent an important yet challenging to measure process. Basal melt rate measurements can assist to further understand ice-ocean interactions. In November 2011, two mooring containing fiber-optic cables for distributed temperature sensing (DTS) were installed at …
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