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 16 of 16 for “"Glacier surface"”.
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Multispectral classification and reflectance of glaciers: in situ data collection, satellite data algorithm development, and application in Iceland & Svalbard
Glaciers and ice caps (GIC) are central parts of the hydrological cycle, are key to understanding regional and global climate change, and are important contributors to global sea level rise, regional water resources and local biodiversity. Multispectral (visible and near-infrared) remote sensing …
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Snowmelt Detection on Alpine Glaciers using Synthetic Aperture Radar Time Series
<p>Hindu Kush Himalayan (HKH) glaciers serve as some of the most sensitive indicators of changes in global climate. These glaciers shape the hydrologic dynamics of river systems supplying freshwater to over 2 billion people throughout Asia and regulate the geochemistry of sensitive aquatic alpine …
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The Mass balance modelling of Spitzbergen glaciers
… of mass balance studies carried out on two glaciers in north-west Spitsbergen, Midre Lovenbreen and Austre Broggerbreen, using an energy balance model. A general description of glaciers, including their classification and the manner in which their surfaces may be sub-divided, is carried out. …
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Observation and modelling of glacier mass balances in Patagonia and Svalbard : application and enhancement of temperature-index based modelling approaches
… to continue this development in the future. Glaciers and ice caps outside the large ice shields of Greenland and Antarctica have been identified as important contributors to sea-level rise. However, to yield any model-based quantification of this development, the climate-related surface mass …
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Quantifying glacier melt enhancement due to dust deposition during the 2022 melt season. Tungnaárjökull glacier, South Iceland
Clean snow has the highest albedo of any natural surface, making snow-covered glaciers an important component of the Earth´s energy balance. However, the presence of light absorbing impurities such as mineral dust on glacier surfaces alters their reflective properties leading to a reduction in …
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Subglacial rhyolite volcanism at Torfajökull, Iceland
… of volcano-ice interaction beneath temperate glaciers at least 350 m thick. <br></br><br></br>All eruptions began with the construction of a pile of glassy fragmental material within a subglacial cavity. Fragmentation at Bláhnúkur was primarily caused by quenching, when rising magma …
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Tracking retreat processes at the Falljökull Glacier, SE Iceland
… inputs and results in asynchroneity between surface melt production and ice movement. Furthermore, subglacial drainage undergoes temporal evolution and can vary spatially between and within individual glaciers. As such, the degree of connectivity between ice melt and ice dynamics exhibits …
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Glacier Surge Dynamics on Western Axel Heiberg Island, Nunavut
Surge-type glaciers experience cyclical variations between long periods of slow flow, followed by shorter periods of rapid flow. These glaciers have been thoroughly analysed in many regions, but detailed studies of surging in the Canadian Arctic are lacking. This thesis provides the first …
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The effectiveness of spaceborne synthetic aperture radar for glacier monitoring
… 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 the analysis, which focuses on mountain glaciers rather than ice …
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Numerical modelling of the dynamics response of glacier to changing climates
… plausible with global warming due to warmer sea surface temperatures, melting of sea ice and a greater moisture holding capacity of the atmosphere. Recent observations show a marked increase in precipitation in the High Arctic regions during the past decades. To make reliable predictions of the …
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Constraining calving dynamics of marine-terminating glaciers: Developing 4D data of Store Glacier, Greenland, from repeat UAV photography
… Ice Sheet’s (GISs) marine-terminating outlet glaciers have shown patterns of swift retreat and thinning, but the mechanism of calving, which controls this loss, is still not fully constrained. This research uses UAV-borne remote sensing data to analyse the calving events of Store Glacier, west …
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Reconstructing the Surge History and Dynamics of Fisher Glacier, Yukon, 1948-2022
Glacier surges are periods of dynamic instabilities which result in semi-regular alternating periods of slow flow, termed the quiescent phase, and fast flow, termed the active phase. This study uses remotely sensed imagery, digital elevation models, glacier velocity datasets, and in situ oblique …
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Temperature-index modelling of runoff from adeclining Alpine glacier
… meltwater fromGornergletscher and its tributary glaciers, which contribute a large proportion of therunoff from this highly-glacierised basin. As the mass of ice has declined, recessionof many smaller tributary glaciers has resulted in their separation from the trunkGornergletscher. Declining …
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Observing the Seasonal Evolution of Supraglacial Ponds in High Mountain Asia: A Supervised Classification Approach
Supraglacial ponds on debris covered glaciers in High Mountain Asia (HMA) can locally store surface runoff and prolong water delivery to downstream river basins (Benn et al., 2012; Miles et al., 2019). Temporal variation in the extent of supraglacial ponding therefore affects the timing and …
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Utilisation of remote sensing for the study of debris-covered glaciers: development and testing of techniques on Miage Glacier, Italian Alps
An increase in the number of debris-covered glaciers and expansion of debris cover across many glaciers has been documented in many of the world’s major glacierised mountain ranges over the last 100 years. Debris cover has a profound impact on glacier mass balance with thick layers insulating the …