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 31 for “"glaciological"”.
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Glaciological investigations in east greenland using digital landsat imagery
… from 1986 to 1989 were acquired for use in glaciological and marine geological investigations. Drainage basin areas and snowline elevations were determined for 74 tidewater glaciers in the study area, and turbid meltwater plumes were identified. A method of correcting digital Landsat MSS …
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Quantifying Supraglacial Debris Thickness and the Glaciological Controls on its Spatial Distribution in High Mountain Asia
… in HMA, this study quantifies the influence of glaciological characteristics (elevation, slope, aspect, curvature, velocity) on debris thickness spatial variability. This will allow for more accurate predictions concerning the evolution of debris thickness distribution in the future. This study …
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The evolution of the Greenland Ice Sheet from the Last Glacial Maximum to present-day: An assessment using glaciological and Glacial Isostatic Adjustment modelling
In this thesis we constrain a three-dimensional thermomechanical model of Greenland ice sheet (GrIS) evolution from the Last Glacial Maximum (LGM, 21 ka BP) to the present-day using, primarily, observations of relative sea level (RSL) as well as field data on past ice extent. The new model (Huy2) …
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The Topography and Flow of the Antarctic Ice Sheet
… shear fluctuates in response to topographic and glaciological constraints. Driving stress patterns have been associated with characteristic glaciological regimes and have suggested a qualitative difference between outlet glaciers and ice streams. The transition to high velocity flow in outlet …
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Determining the ability of terrestrial time-lapse microgravity surveying on a glacier to find summer mass balance using gravitational modeling
… has predominantly been monitored by; (1) glaciological and hydrological methods, and (2) satellite gravimetric methods using data from NASA’s Gravity Recovery and Climate Experiment (GRACE) satellite mission. However, the former can be logistically costly and have large extrapolation …
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
… Ice Sheet (WAIS). This thesis next explores glaciological factors controlling WAIS stability, associated with the fracturing of ice sheet margins supported by floating ice shelves. The Marine Ice Cliff Instability posits ice cliffs above a critical height collapse under their own weight, …
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
… Ice Sheet (WAIS). This thesis next explores glaciological factors controlling WAIS stability, associated with the fracturing of ice sheet margins supported by floating ice shelves. The Marine Ice Cliff Instability posits ice cliffs above a critical height collapse under their own weight, …
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Using Archived Aerial Photography to Measure Long-term Change in the Surface Elevation of Larsen A Tributary Glaciers from 1957 to 2020
… region is key to improving our understanding of glaciological behaviour and responses to AW. The rate of AP ice mass loss significantly increased from 8 ± 17 Gt yr-1 in 1992 to 36 ± 10 Gt yr-1 in 2010 (Shepherd et al., 2012). At the start of this period, 87% of outlet glaciers on the AP showed …
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The effectiveness of spaceborne synthetic aperture radar for glacier monitoring
… (SAR) for investigating seasonally variable glaciological parameters, in particular its ability to discriminate glacier surface facies in order to estimate glacier mass balance. A multitemporal C-band SAR dataset of Nordenskiold Land, Spitsbergen, acquired by the ERS-1 satellite, is used for …
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Characteristics of lateral-frontal moraine formed at Arctic and Alpine glaciers
… glacier landsystems. However, the climatic, glaciological, and topographic regimes in which the moraines form influence the resulting character of the landform. The evolution of a degrading ice-cored moraine at Austre Lovénbreen is investigated using repeat photogrammetric topographic …
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Characterising Sikussak and Other Forms of Ice Melange in Greenland Fjords
… has a complex and disordered history of use in glaciological literature, and no dedicated studies of sikussak characteristics have yet been carried out. Using ATM elevation data from the NASA Operation IceBridge campaign, profiles of pro-glacial sikussak and ice melange are derived. Sikussak …
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Ablation on the ice cap of King George Island (Antarctica) : an approach from field measurements, modelling and remote sensing
… approaches were combined and the present glaciological and climatological knowledge of the ice cap compiled. The work focuses on surface energy balance modelling based on data from three summer field campaigns in the years 1995/96, 1997/98 and 1999/2000 at sites in different altitudes on …
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Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… is responsible for creating the bathymetric and glaciological conditions required for these collapses. Three ice streams are investigated, which existed in the Hudson Strait, The Amundsen Gulf, and the Gulf of St. Lawrence. I additionally find that the recovery from the Younger Dryas occurred …
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Radio-echo layering in polar ice sheets
… 1974 and 1979, and discusses the effects of glaciological and equipment factors, particularly radio pulse length. The effects of changing pulse length and accumulation rate on layer echo separation are analysed, and the importance of closely spaced groups of reflectors assessed. Reflection …
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The Evolutionary History of the Antarctic Flora
… the extant flora been present in the Antarctic? Glaciological reconstructions propose that most areas in Antarctica were covered by thick ice sheets throughout the Last Glacial Maximum (LGM; ~22-18 kya) as well as previous glaciations, suggesting terrestrial life must have been extremely limited …
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Radio Echo Sounding Studies of Svalbard Glaciers
… use these data to obtain information about the glaciological environment. Particular emphasis was placed on obtaining an understanding of the dielectric properties of the ice and reflecting boundaries present. These were then used to elucidate the physical processes causing them. First, a …
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Drumlins in North Dakota
… a mound or rounded hill, and has been used in glaciological literature since 1866. But with the increased study of subglacial ·shear features the terminology has become very inconsistent. The glacially formed longitudinal ridges found in northeastern North Dakota can be referred to as either …
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Blink and You'll Miss It: An Investigation into Surging on Flade Isblink, Greenland
… This study therefore applies a 3D, full-Stokes glaciological flow model, Elmer/Ice, to Flade Isblink, the largest fringing ice cap in Greenland, to investigate its basal conditions and the mechanism of a surge of two of its major outlet glaciers observed around the turn of the millennium. The …
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Recent Changes to Langjökull Icecap, Iceland: An investigation integrating airborne LiDAR and satellite imagery
… Vestari. In sum, the technological and glaciological information put forward in this study provides a method for innovative cryospheric research, presents a much needed benchmark and update on the state of Langjökull, and ultimately facilitates and encourages continued monitoring of …
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Constraining calving dynamics of marine-terminating glaciers: Developing 4D data of Store Glacier, Greenland, from repeat UAV photography
… order to develop our knowledge of this important glaciological process. Repeat aerial photography of the terminus of Store Glacier were collected by the RESPONDER project. These images were taken and run through photogrammetry software in order to produce 3D point clouds, and ultimately …
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