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 69 for “"ice shelf"”.
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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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The ocean tide beneath the Ross Ice Shelf
Measurements of the ocean tide beneath the Ross Ice Shelf by a gravimetric method at five locations (79.3°S, 189.7°W; 79.8°S, 169.1°W; 80.2°S, 161.6°W; 82.5°S, 166.0°W; 78.2°S, 162.3°W), and conventional sea level measurements at one location (77.9°S, 193.4°W), show that the diurnal constituents of …
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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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The ocean tide and waves beneath the Ross ice shelf, Antarctica
… variation of the ocean tide beneath the Ross Ice Shelf. Cotidal-coamplitude maps have been drawn for the six greatest harmonic constituents of the tide. These are K₁, P₁, O₁, M₂, S₂, and N₂. The tide is principally diurnal, the diurnal amplitudes being roughly 3 times longer than the …
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Polar föhn winds and warming over the Larsen C Ice Shelf, Antarctica
… (AP) and enhanced melt rates on the Larsen C Ice Shelf are supported in a study combining the analysis of observational and high resolution model data. Leeside warming and drying during foehn events is observed in new aircraft, radiosonde and automatic weather station data and simulated by the …
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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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Characterisation of microbial Mat communities in meltwater ponds of the McMurdo ice shelf, Antarctica
… Fresh, Orange and Salt Ponds on the McMurdo Ice Shelf, near Bratina Island, Antarctica. These sites were chosen because of the ecological importance and absence of detailed characterisations of their diversity and function as part of Antarctica's largest wetland. Particular focus was on …
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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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Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents
Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in flow speeds of marine ice sheets around Antarctica. Modeling these interactions requires parameterizing the turbulent boundary …
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Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents
Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in flow speeds of marine ice sheets around Antarctica. Modeling these interactions requires parameterizing the turbulent boundary …
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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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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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Seasonal and interannual variability of the marine carbonate system at the ice shelf in the eastern Weddell Gyre and its sensitivity to future ocean acidification
… saturation state (Ωarag) at the Antarctic ice shelf between 4°E and 14°W and in the Eastern Weddell Gyre, during the Austral summers of 2008/2009, 2009/2010, 2010/2011 and 2011/2012. This study shows that at the Antarctic ice shelf andin the Eastern Weddell Gyre (EWG), seasonal summertime …
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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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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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Mechanical Shock Analysis and Testing of an Air-Dropped Antarctic Ice Penetrator
The Seismo-Geodetic Ice Penetrator (SGIP) is an air-dropped kinetic penetrator that will deposit a geophysics-grade seismometer and GPS receiver into Antarctic ice shelves. These instruments will measure vibrations in the infragravity (< 0.1 Hz) range to improve understanding of forces that cause …
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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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Marine cycling of neodymium in the South Atlantic and the Southern Oceans
… the Bellingshausen Sea, and the Antarctic sub-ice shelf cavities, respectively. Measurements on seawater neodymium isotopic composition (ƐNd) and carbon isotopic composition (δ13C) of 40°S transect in the South Atlantic are made to examine the cycling of Nd in this region. The results show that …
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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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