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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 20 of 28 for “"glacial ice"”.
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A study of microfabric and structures in glacial ice: insights from Storglaciären, northern Sweden
Better understanding of the flow of ice is essential for helping to predict and adapt to the global mean sea level rise in the coming decades and centuries. Flow produces internal structures and fabrics in glaciers that in turn influence the flow. Documenting and understanding the internal …
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Pleistocene stratigraphy of the Red Lake Falls area, Minnesota
… Counties, Minnesota. Five formations are largely glacial, sediment, and two are largely lacustr1ne sediment deposited during phases of Lake Agassiz. </p><p> The Gervais Formation (pre-Wisconsinan or early Wisconsinan) is mostly fluvial or lacustrine sediment modified by glacial ice of unknown …
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Black magnetic spherules from the glacial and sea ice of Fletcher's Ice Island (T-3)
… from cosmic sources. Spherules from both the glacial ice and sea ice of Fletcher's Ice Island (T-3) were studied to determine their size distribution, sedimentation rates, and other parameters. The results were examined and shown to be similar to those of other researchers' work elsewhere. …
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The Effects of Snowmelt Percolation on Stratified Pollen Records: A Cooler Study
… percolation on pollen found in snow and glacial ice. Previous studies have suggested that pollen is relatively impervious to meltwater percolation due to grain size and, thus, resists transport. However, investigations on McCall Glacier in the Brooks Range of northeast Alaska reveal a …
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SVALPEN Svalbard Radar Snow Penetration Experiment
Studying the extent and thickness of sea and glacial ice in a warming climate is important since they have both local and global significance in the form of feedback loops, climate effects, and ship transport, among others. While the extent of ice is well studied using satellite-based radar remote …
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The Pleistocene History of the Birmingham District
… and Devensian) as well as a variety of non-glacial sediments. Understanding the age of the Pleistocene glacial deposits is critical to reconstructing the palaeoenvironmental history of the district and its relationships with adjacent regions. The exact age of the Middle Pleistocene glacial …
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Periglacial landforms and processes in the southern Kenai Mountains, Alaska
<p>The distribution and characteristics of periglacial landforms in the southern Kenai Mountains, Alaska, were investigated during the summer of 1979. The principal area of study was a 1300-metre high mountain mass which stood as a nunatak during the last general glaciation. Periglacial features in …
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Multisensor Microwave Remote Sensing in the Cryosphere
… proven to be a useful tool in estimating sea and glacial ice surface characteristics with both scatterometers and radiometers exhibiting high sensitivity to important ice properties. This dissertation presents an array of studies focused on extracting key surface features from multisensor …
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MOLECULAR AND MORPHOLOGICAL CONSEQUENCES OF POST-GLACIAL CONTACT AMONG LINEAGES OF NORTHERN SHORT-TAILED SHREWS (Blarina brevicauda) IN EASTERN NORTH AMERICA
<p>During the Pleistocene, advancing glacial ice fragmented populations of species, which restricted populations from expanding, ultimately inhibiting gene flow. As glaciers receded, expansion out of unglaciated-isolated areas was possible. In addition to glacial barriers, landscape features such …
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Cross-shelf exchange driven by dense flow down a canyon
… heat transport induced by the return flow drives glacial ice melt and therefore contributes to sea level rise.
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Modeling Subglacial Hydrology in the Himalayas
… which provide water to over a billion people. Glacial retreat, glacial lake outburst flooding (GLOFs), surge behavior, and glacial ice mass balance are all likely strongly affected by subglacial hydrology. Unfortunately, little is known about Himalayan glaciers due to their remoteness and the …
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Cross-Shelf Exchange Driven by Dense Flow Down a Canyon
… heat transport induced by the return flow drives glacial ice melt and therefore contributes to sea level rise.
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Quaternary geology of Rolette County, North Dakota
… part of the Turtle Mountains and part of the glacial Lake Souris basin. Basic lithologies recognized in the surface sediments were bedded clay, silt, sand, and gravel; and three types of non-bedded diamicton. These were combined and, with bedding characteristics and organic content, formed 15 …
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Murky waters: discerning among sources of natural variation under high uncertainty and at multiple scales
… of energy, and as providers of ecosystem services are incompletely understood. High elevation aquatic systems are of particular concern due their high susceptibility to variation under changing regional climates. I investigated the proportion of consumer biomass derived from terrestrial …
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The surficial geology of southern Logan County, North Dakota
… in age.</p> <p>A great diversity in types of glacial topography and individual features is found in southern Logan County. Excellent examples of end moraine, recessional moraines, ground moraine, outwash plains, meltwater channels, and ice-contact features were mapped. Great areas of “dead …
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Environmental drivers of coastal evolution
… environments. Chapter 2 models the effects of glacial ice retreat on surface hydrology and quantifies resulting effects on fluvial sediment transport, showing that landscape changes that accompany deglaciation shape the evolution of rivers and the delivery of sediment to the coast. Chapter 3 …
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Stratigraphic and Geochemical Expression of Early Cretaceous Environmental Change in Arctic Svalbard
… do not show evidence that they were rafted by glacial ice (e.g. surface striations), although could have been rafted by seasonal sea-ice. The results show that regionally widespread cold water conditions were the most likely control on ikaite formation and glendonite preservation. This counters …
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Analysis of microbes in Greenland ice cores from periods of high and low atmospheric carbon dioxide levels
Glacial ice entraps microbial cells and nucleic acids that have been deposited from the atmosphere by precipitation or on dust particles carried by the wind. The ice is deposited in sequential layers representing distinct past periods of time. Metagenomics and metatranscriptomics offer means to …
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Intra- and Inter-Seasonal Variability of Supra-Glacial 1 Streams and Lakes over the West Greenland Ice Sheet 2 from High-Resolution Satellite Optical Data
<p>The Greenland ice sheet (GrIS) is one of the largest glacial ice masses on Earth, second only to the Antarctic ice sheet. The surface hydrology of the GrIS plays a crucial role on the surface energy and mass balance budgets of the ice sheet as a whole. Surface water, known as supra-glacial …
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Influence of Tides and Mesoscale Eddies in the Ross Sea
… mass volumes well, but has a reduced amount of Ice Shelf Water. Analysis of eddy formation in the model indicates that the weak stratification produces small and short-lived mesoscale eddies in the Ross Sea. The increased resolution approximately doubles the number of eddies seen in one year of …
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