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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 12 of 12 for “"Ross Ice Shelf"”.
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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
… temporal 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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Aerodynamics and Impact Simulation of an Air-Dropped Ice Penetrator
In order to investigate movement of the Ross Ice Shelf in Antarctica, an air-dropped ice penetrator will be employed. Dropping a seismic probe from a helicopter offers several advantages over sending out a conventional crewed mission, such as reduced transit time and access to hard-to-reach …
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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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Aerodynamic and Thermal Considerations for an Antarctic Ice Penetrator
The Seismo-Geodetic Ice Penetrator (SGIP) is a helicopter-deployed kinetic penetrator designed to deliver a Global Navigation Satellite System (GNSS) and geodesy-grade seismometer to the Ross Ice Shelf (RIS) in Antarctica such that the seismometer becomes buried 2 m deep in the ice, ensuring …
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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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Quaternary grounding-line fluctuations in Antarctica
The West Antarctic Ice Sheet may be prone to rapid collapse under climates warmer than today due to a dynamic instability at the grounding line, where the ice sheet goes afloat over seawater. However, there is to-date no conclusive evidence that the ice sheet has gone away in last few million …
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Modeling the Seasonal Sea Ice Cycle in the Ross Sea, Antarctica
… coupled thermodynamically/dynamically to a sea ice model (CICE) and thermodynamically to an ice shelf is used to investigate Ross Sea seasonal sea ice cycle, polynya dynamics, distribution and transformations of continental shelf water masses, and bottom water formation. Daily atmospheric …
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Design and analysis of penetrator probes for planetary science applications
… work carried out on the Geodetic Seismic Ice Penetrator (GSIP). GSIP is a separable two-body penetrator designed for air-deployment from LC-130 aircraft into snow pack on the Ross Ice Shelf, using existing polar research aircraft as the deployment method. The mission objective is to …
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Tidal and Structural Controls on Seismic Events Near the Grounding Line at Beardmore Glacier, Antarctica
… The ~24000 events over this time frame had a noticeable temporal pattern that correlates well with the principally diurnal tides of Antarctica. Falling and rising tide each accounted for nearly equal occurrence of events, and most (~42%) events occurred in the last third of any tidal cycle. Event …
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Effect of environmental temperature on Antarctic fish antifreeze protein activity and concentration
… freezing sea surface water temperatures and ice formation only during the austral winter but the water below 100 m is warmer due to the effects of the Circumpolar Deep Water (CDW) that flows onto the shelf. During the winter the temperature gradient can range from -1.9°C at the surface to …