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.
Results
Showing 1 to 11 of 11 for “"Supraglacial lakes"”.
-
Remote sensing of rapidly draining supraglacial lakes on the Greenland Ice Sheet
Supraglacial lakes in the ablation zone of the Greenland Ice Sheet (GrIS) often drain rapidly (in hours to days) by hydraulically-driven fracture (“hydrofracture”) in the summer. Hydrofracture can deliver large meltwater volumes to the ice-bed interface and open-up surface-to-bed connections, …
-
Quantification of the Impact of Supraglacial Lakes and Slush on Surface Energy Balance of Ice Shelves: Nivlisen Ice Shelf, East Antarctica
Supraglacial lakes (SGLs) and slush are prevalent features of Antarctic ice shelf surface hydrology and efficiently transfer energy to the ice by melt-albedo feedbacks (Dell et al., 2020; Moussavi et al., 2020). There have been few efforts to quantify the energy exchanges between supraglacial …
-
Analysis of the surface hydrology of the Greenland Ice Sheet using Sentinel-1 Synthetic Aperture Radar
… to form features such as firn slush zones and supraglacial lakes. This study uses imagery from the recently launched Sentinel-1 Synthetic Aperture Radar sensors to investigate supraglacial lakes in southwest Greenland. This novel method can overcome some of the limitations of optical sensors …
-
Supraglacial lake evolution on the Greenland Ice Sheet
Abstract. Supraglacial lakes form annually on the surface of the Greenland Ice Sheet around Paakitsoq, north of the Jakobshavn Isbrae outlet glacier. The lakes are ephemeral, drain through moulins or crevasses at their bed throughout the melt season, and deliver large volumes of water to the …
-
Modelling the Hydrology of the Greenland Ice Sheet
… topographic depressions which can fill to form supraglacial lakes. This model component is calibrated against field measurements of a filling lake in the study area made during June 2011. Supraglacial lakes are able to drain by a simulated hydrofracture mechanism if they reach a critical volume. …
-
Evidence for the Drainage of a Superglacial Lake as the Source of Seismic Waves Recorded at a Regional Distance
… during the summer leads to the formation of lakes on the Greenland Ice Sheet surface, known as supraglacial lakes. Some of these lakes drain through cracks in their beds and release the water into the ice sheet. Previous studies suggest that some of the water reaches the bedrock, enabling …
-
Marine-terminating outlet glacier response to hydrological mechanisms: A comparative study at Store Glestcher and Rink Isbrae, Uummannaq Bay, West Greenland
… of hydrological processes via surface runoff and supraglacial lake drainage. There has been increasing evidence for the influence of enhanced meltwater inputs on impacting short term velocity at marine-terminating outlet glaciers with contrasting responses at individual glaciers. This study uses a …
-
Inferring subglacial hydrology from investigations of supraglacial lake drainages and meltwater plumes at Store Glacier, West Greenland
… drainage systems come from drainage of supraglacial lakes, crevasses and moulins. The water travel downstream through subglacial channels, eventually reaching the terminus of the glacier, where the freshwater discharge form buoyant plumes that rise through the ambient ocean water, and …
-
Assessing glacier retreat and landform production at the ‘debris-charged’ snout of Kvíárjökull, Iceland
… is attributed to the growth of proglacial and supraglacial lakes associated with high rates of backwasting. Backwasting of ice cores consumes ridges of high relief, thus, reducing the preservation of controlled moraine ridges. A model for the de-icing of ice-cored moraines is presented in which …
-
The development and application of IceLake, an accurate and computationally efficient model of supraglacial lake evolution in the ablation zone of the Greenland Ice Sheet
The supraglacial hydrological system of the Greenland Ice Sheet (GrIS) delivers ~60% of total mass loss from the ice sheet to the ocean (van den Broeke et al., 2016), making a thorough understanding crucial for sea level rise predictions. Supraglacial lakes play a crucial role in the evolution of …
-
Glacial stratigraphy of northwestern Cass County, North Dakota
… part of the study area and represent collapsed supraglacial lake sediments deposited between 11,900 and 11,700 years B.P.</p> <p>Differentiation of the units was best demonstrated by their relative stratigraphic positions, density, and lithologic composition. The presence of units nB", "C", "E" …