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 39 for “"Ice thickness"”.
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Morphological approaches to understanding Antarctic Sea ice thickness
Sea ice thickness has long been an under-measured quantity, even in the satellite era. The snow surface elevation, which is far easier to measure, cannot be directly converted into sea ice thickness estimates without knowledge or assumption of what proportion of the snow surface consists of snow …
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What Causes North Pole Ice Thickness to Change
… of submarine sonar sampling of North Pole ice drafts demonstrated that the mean ice draft and standard deviation may be estimated within +/-0.2 m with the first 3% of a typical 50--60,000 observation data set. An additional 30% of the observations were needed to improve the accuracy of the …
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Morphological approaches to understanding Antarctic Sea ice thickness
Sea ice thickness has long been an under-measured quantity, even in the satellite era. The snow surface elevation, which is far easier to measure, cannot be directly converted into sea ice thickness estimates without knowledge or assumption of what proportion of the snow surface consists of snow …
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The estimation of Arctic ice thickness from ambient noise
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Sea ice thickness and iceberg distribution in the Southern Ocean
The sea ice thickness distribution, represented by the probability density function (PDF), is critical to Earth's climate system and knowledge of the distribution in the Antarctic is limited. A novel methodology, using an acoustic Doppler current profiler, was developed to measure sea ice draft …
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Investigating the Crucial Factors Impacting the Accuracy of Machine Learning Models for Lake Surface Water Temperature and Ice Thickness Prediction
… impact lake surface water temperature and ice thickness. First, we evaluate nine machine learning algorithms for lake surface water temperature prediction in synthetic lakes, comparing their performance and investigating the effects of input variables on accuracy. Our study, based on a …
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The effects of precipitation and river runoff anomalies in a coupled ice-ocean model of the Arctic
A coupled ice-ocean model of the Arctic Ocean and adjacent seas is developed in order to study the effects of anomalies of precipitation and river runoff on sea ice. A dynamic-thermodynamic sea ice model is coupled to an ocean general circulation model which includes a turbulence closure scheme for …
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Radio Echo Studies of Glaciers
There is a need for measurements of the thickness of glaciers, ice sheets, and ice shelves. Radio waves propagating in naturally occurring ice masses are attenuated by absorption in the conducting medium, by reflection from discontinuities, and by scattering from inhomogeneities. These scattering …
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Ice Action Database for the Confederation Bridge Piers
Ice forces on offshore structures are often the primary design load condition and it is therefore important that they be understood, and can be predicted accurately. During the design of piers of the Confederation Bridge, various design parameters including ice velocity, ice thickness, rubble …
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On optical and physical properties of sea ice in the Baltic Sea
Sea ice has been recognized as one of the key elements of polar and sub-polar seas, including Baltic Sea. The existence of sea ice cover and its properties have influence to many aspects of marine biology, climate and seafaring. This thesis is concentrated on describing physical and optical …
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Seasonality in the response of sea ice and upwelling to wind forcing in the southern Beaufort Sea
The seasonal pattern of ice motion in response to wind forcing and potential consequences to upwelling on the Mackenzie Shelf are considered using satellite-derived ice motion data from the National Snow and Ice Data Center and the NCEP 10 m wind data. The frequency of strong upwelling-favorable …
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Modelling sea ice floe fields
… thesis is concerned with the modelling of sea ice, particularly in regions where it is composed of individual floes interacting through collisions. This has been done by modifying and extending existing models that have demonstrated their ability to simulate sea ice in various Arctic and …
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Remote Sensing Studies of Svalbard Glaciers
… aspects of the morphology and dynamics of the ice caps of Nordaustlandet, Svalbard. Data collection, methods of reduction and errors are discussed. Three principal topics are examined. First, as a preliminary to comprehensive radio echo sounding operations over Nordaustlandet, the ability of 60 …
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Experimental and CFD Study of Wind-Induced Response for Bridge Cables with Ice accretion
… a new type of cable vibrations caused by ice accretion formed around the cable circumference. The current research proposed two ice accretion profiles for inclined bridge cables and has experimentally investigated the wind-induced vibrations of the two models for the bridge stay-cables …
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Studies of the Arctic Ocean sea ice cover and hydrothermal heat fluxes
Since reliable ice extent estimates from satellite data became available in 1979 the Arctic sea ice cover has followed a declining long term trend. Over the last decade the decline has accelerated with record low sea ice extents recorded in 2002, 2005, 2007 and 2012. In order to explain the …
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The flow and variability of sea-ice in the Canadian Arctic Archipelago: modelling the past (1950-2004) and the future (2041-2060)
… the recent losses observed in Arctic sea-ice and the anticipated future warming due to anthropogenic greenhouse gas emissions, sea-ice retreat in the Canadian Arctic Archipelago (CAA) is expected. As most global climate models do not resolve the CAA region, a fine-resolution regional model …
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Polar Region Sea Ice Classification With Multimodal Learning
… accurate monitoring and classification of sea ice. This thesis presents a multimodal learning approach for classifying polar sea ice thickness using both satellite imagery and altimetry data. The objective is to distinguish between thick ice, thin ice, and open water, which are crucial for …
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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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NUMERICAL MODELING OF THE VERTICAL HEAT TRANSPORT THROUGH THE DIFFUSIVE LAYER OF THE ARCTIC OCEAN
… in recent years due to the reduction of the sea-ice thickness and spatial coverage and its implications for climate change. The future state of the Arctic is likely to be linked to vertical heat transport by microscale processes, specifically, double-diffusive convection. A series of realistic …
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Modelling the subglacial drainage system of Petermann Glacier, north-west Greenland
Studies suggest that much of the Greenland Ice Sheet is accelerating as temperatures increase. Increased temperatures can raise the pressure in the subglacial drainage system as meltwater input increases and the system fails to efficiently evacuate it. Some studies suggest that increased …
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