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 95 for “"ice sheets"”.
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Water flow beneath past ice sheets
The movement of water beneath ice sheets exerts an important, yet poorly understood, control on how ice masses respond to climatic warming. However, the subglacial realm of ice sheets is one of the most inaccessible environments on Earth. Consequently, little is known about the processes that …
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Radio-echo layering in polar ice sheets
… observed in the Antarctic and Greenland ice sheets during radio-echo sounding. It describes in detail layering seen with 60 and 300 MHz equipment _in the Antarctic ice sheet during three field seasons betwe~n 1974 and 1979, and discusses the effects of glaciological and equipment factors, …
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Reduced modelling of mountains and ice sheets
The motion of rocks that make up mountains and of ice in glaciers and ice sheets can often be treated as a fluid flow. These geophysical systems are, however, very complex in terms of the rheology of their constituents and their interactions with environment. Simple mathematical models are often …
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Advanced Methods for the Analysis of Radar Sounder Data Acquired at the Ice Sheets
… complete collection of information about the ice sheets and glaciated areas is contained in the data (radargrams) acquired by Radar Sounder (RS) instruments. The need to better understand the structure of the ice sheets and the availability of enourmous quantities of radargrams call for the …
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Investigation of a Possible Lead-Lag Relationship Between the Innuitian and Laurentide Ice Sheets, Arctic Canada
… cores matched to the Laurentide and Innuitian Ice Sheets appear to show a lead-lag relationship during the Late Pleistocene when grain abundances are plotted against time and depth below sea floor. Cores from across the Arctic have been analyzed to determine if this is the case. Of the six IRD …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
With the goal of determining ice sheet history in the central Ross Sea since the late Miocene, the provenance of glacial till from IODP expedition 374 site U1522 was assessed using a suite of three analyses. A total of 3,869 zircons, between 250-63 microns in size, from sixteen different cores were …
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Wobbly winds in an ice age : the mutual interaction between the great continental ice sheets and atmospheric stationary waves
The ice sheets of the last glacial maximum (about 21 thousand years ago) covered a significant fraction of the high latitude land mass, reached up to 3km in height, and had length scales of thousands of kilometers. They represented significant obstacles to the westerly flow of the atmosphere. As …
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Prediction under uncertainty : from models for marine-terminating glaciers to Bayesian computation
The polar ice sheets have enormous potential impact on future global mean sea level rise. Recent observations suggest they are losing mass to the ocean at an accelerated rate. Skillful prediction of the ice sheets' future mass loss remains difficult, however; observations of key variables are …
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Submarine Landforms and Late Quaternary Ice Flow in Hinlopen Strait, Northern Svalbard Margin
… trough is thought to have been occupied by an ice stream which flowed north across the continental slope (Ottesen et al., 2007). This project is concerned with examining the submarine landforms and acoustic stratigraphy of this palaeo-ice stream with a view to furthering our understanding of …
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An Assessment of Surface Ice Sheet Loads and Their Effects on an Offshore Wind Turbine Structure
This thesis examines the effects of surface ice sheets on an offshore wind turbine. First, the main ice load cases are presented, and methods used to calculate the loads from each of these cases are explained. These load cases consist of loads from moving ice sheets, loads from non-moving ice …
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Modeling the climatic sensitivity of the inception of the Fennoscandian Ice Sheet
Understanding the sensitivity of ice sheets to climate forcing is crucial for predicting future behavior of ice sheets. Multiple studies have analyzed the inception of the Quaternary ice sheets using time-dependent global climate models. The results have indicated that although carbon dioxide …
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Deciphering climatic controls on sedimentation in a tectonically active area, Cyprus
… the expansion of the Northern Hemisphere Ice Sheets and the Middle Pleistocene Transition. Despite the globally significant climatic events during the period of deposition, the Plio-Pleistocene climatic record in Cyprus is largely unknown and for the most part ignored. The objective of …
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GEOPHYSICAL INVESTIGATION OF GLACIER GEOMETRY AND SUBGLACIAL GEOLOGY, AND THEIR INFLUENCE ON GLACIER DYNAMICS: CASE STUDIES OF TAKU GLACIER, ALASKA AND THWAITES GLACIER, WEST ANTARCTICA
Mass loss from glaciers and ice sheets is a significant contributor to the rise of global mean sea level (GMSL) and will continue to be in the future. Rising GMSL will cause displacement of coastal populations, loss of ecosystems and rising food in- security. To plan for and mitigate these impacts, …
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Development of a Higher-Order Ice Sheet Model Using a Rescaled Coordinate System
… 19 to 11 cm is attributed to the largest ice masses on the planet, the Antarctic and Greenland ice sheets. Over the last decade, dramatic activity in the outlet glaciers of Greenland and the Antarctic Peninsula raise the possibility that these large ice sheets will have a much greater …
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Development of a Higher-Order Ice Sheet Model Using a Rescaled Coordinate System
… 19 to 11 cm is attributed to the largest ice masses on the planet, the Antarctic and Greenland ice sheets. Over the last decade, dramatic activity in the outlet glaciers of Greenland and the Antarctic Peninsula raise the possibility that these large ice sheets will have a much greater …
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Height change detection in Antarcita using satellite altimetry data and Kriging / Kalman filtering techniques
Studies of the response of ice sheets to climate change require data sets with high accuracy and uniform ice-sheet coverage. The most common technique used in analyzing satellite altimetry data to study height change in the ice sheets is the dH/dt technique based on the cross-over geometry. In this …
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The recent history of the Antarctic ice sheet : constraints from sea-level change
The rheology of the earth and the history of ice sheets, which have a major contributing role in climate change, are both subjects of considerable interest in earth sciences, and the study of sea-level change provides insight into both. Sea-level change since the last glacial maximum (LGM), about …
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The recent history of the Antarctic ice sheet : constraints from sea-level change
The rheology of the earth and the history of ice sheets, which have a major contributing role in climate change, are both subjects of considerable interest in earth sciences, and the study of sea-level change provides insight into both. Sea-level change since the last glacial maximum (LGM), about …
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Late Quaternary ice-ocean interactions in central West Greenland
… of the interactions between the Greenland Ice Sheet and climate is critical to understanding the possible impacts of future global warming, including ice sheet contribution to global sea-level rise and perturbations to ocean circulation. Recent acceleration, thinning and retreat of major …
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