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 156 for “"meltwater"”.
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Identifying Glacial Meltwater in the Amundsen Sea
… waters melting the ice from below. The glacial meltwater appears as a warmer and more saline water mass (with lower O2 concentration) than theWinterWater. Tracing meltwater pathways from ice shelves is important for identifying the regions most affected by the increased input of this water type. …
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Influence of meltwater on Greenland Ice Sheet dynamics
Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production observed over recent decades and predicted into future decades, …
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Meltwater temperature in streams draining from Alpine glaciers
… ecology, and biological conditions in rivers. In meltwater streams draining from Alpine glaciers, temperatures measured close to glacier termini show strong diurnal variation and paradoxical seasonal variation, being cool when energy availability is greatest. This thesis aims to describe temporal …
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Influence of meltwater on Greenland Ice Sheet dynamics
Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production observed over recent decades and predicted into future decades, …
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Meltwater stream temperature responses to air temperature and characteristics
… characteristics including distance travelled by meltwater in determining water temperature in meltwater rivers draining from Alpine Glaciers. Hood et al, (2013) suggested that percentage glacierisation was the determining influence on water temperature in streams draining large glacierisied …
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Mixing and circulation of meltwater outflow plumes in polar fjords
… is concerned with the physical oceanography of meltwater plumes emerging at the base of glaciers at heads of fjords. First, a numerical model is developed and simulations to show the use of such a model are presented. Field work to verify the model was carried out, and the results of these …
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Characterisation of microbial Mat communities in meltwater ponds of the McMurdo ice shelf, Antarctica
… the microbial and functional diversity of the meltwater ponds 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 …
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Constraining the pathways and fluxes of subglacial meltwater beneath the palaeo-Antarctic Ice Sheet
… is inconsistent with the minimal quantities of meltwater produced under the Antarctic Ice Sheet at present; consequently, their formative mechanism, and its implications for palaeo-ice sheet dynamics, remain unresolved. Here, a compilation of over two decades of multibeam swath bathymetry data, …
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Coastal meltwater plume detection and its response to melting variations around the Greenland Ice Sheet
Meltwater runoff is an important component of the mass balance of the Greenland ice sheet and is usually assessed using climate-mass balance models. In-situ measurements of runoff from the outlets are rare, and remote sensing platforms capable of monitoring runoff in rivers, lakes and fjords are in …
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Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland
… two decades, and a feedback between surficial meltwater production, resultant basal lubrication and ice-sheet flow velocity during the summer ablation season has been suggested as an explanation. Meteorological conditions have long been known to be an important driver of surface melt, and the …
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Modern sedimentation in the Northern Barents Sea : input, dipersal and deposition of suspended sediments from glacial meltwater
… flour is supplied by several large stable meltwater outflow locations along the ice front. Because the water is fresh and nearly the same temperature as the ambient coastal water, it is bouyant. Although the traction load deposits as the meltwater plume rises to the sea surface, sand (as …
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Reconstructing the depositional history of the Eel River paleo meltwater channel, northeastern Indiana using sediment provenance techniques
The outwash deposits of the Eel River paleo meltwater channel in DeKalb and Allen Counties, Indiana predominantly originated from the Erie Lobe of the Laurentide Ice Sheet, but do contain some sediment from the Saginaw Lobe. This determination helps clarify the ice dynamics and Last Glacial Maximum …
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Modelling meltwater drainage in the Paakitsoq region, western Greenland, and its response to 21st century climate change
… been well documented, whereby increased surface meltwater accessing the ice sheet bed results in high subglacial water pressures that lubricate the bed and enhance basal motion. This could in turn drastically amplify the contribution of GrIS to sea-level rise (SLR). However, the inadequate …
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Inferring subglacial hydrology from investigations of supraglacial lake drainages and meltwater plumes at Store Glacier, West Greenland
… unique subglacial drainage systems and discharge meltwater into adjacent fjords differently. However, studies of the subglacial hydrology of individual tidewater glaciers have been limited, largely due to the difficulty in obtaining direct measurements. The input of water to the subglacial …
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Modern sedimentation in the Northern Barents Sea : input, dipersal and deposition of suspended sediments from glacial meltwater
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Investigating the potential of meltwater as a local source of ice nucleating particles in the central Arctic summer
… in source samples of bulk sea water and meltwater from ponds and leads over the month of July. In addition, ambient aerosol filters were deployed both on the ship and on the ice, downwind of these meltwater features. We found that the concentration of INPs in meltwater was 10 times higher …
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Evolution of basal channels, ice fracture, and surface meltwater, and implications for the stability of the Roi Baudouin Ice Shelf
… other remotely-sensed datasets of surface meltwater, damage, and strain, to carry out a full ice-shelf-wide contemporary assessment of basal channel distribution and geomorphology across the RBIS over a 20 year study period (2002 - 2021). It aims to constrain potential relationships between …
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Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams
… mixed bedrock-alluvial meandering channels, and meltwater meandering channels. Experimental work was conducted to advance the current understanding of the processes and characteristics of these two types of meandering rivers. Specifically, this dissertation answers the following questions: 1. How …
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Investigating the surface hydrology of Antarctic ice shelves using remote sensing and machine learning
Surface meltwater 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. …
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The Effects of Snowmelt Percolation on Stratified Pollen Records: A Cooler Study
… However, little is known about the effects of meltwater 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 …
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