2 edition of Flow of floating and grounded ice sheets. found in the catalog.
Flow of floating and grounded ice sheets.
Thesis (Ph.D.), University of East Anglia, School of Mathematics and Physics, 1990.
The Marine Ice Sheet Instability hypothesis is that atmospheric and oceanic warming could result in increased melting and recession at the grounding line on a reverse slope gradient. This would result in the glacier becoming grounded in deeper water and a greater ice thickness. ICE SHEETS Boundarycondition of grounding lines prior to collapse, Larsen-B Ice Grounding zones, where ice sheets transition between resting on bedrock to full floatation, help regulate ice flow. Exposure of the sea floor by the Larsen-B Ice Shelf collapse of floating ice (8). Tributary glaciers that had fed.
Surface meltwater drains across ice sheets, forming melt ponds that can trigger ice-shelf collapse 1,2, acceleration of grounded ice flow and increased sea-level rise 3,4,cal models of the Cited by: An ice shelf is a large floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are only found in Antarctica, Greenland, Canada, and the Russian boundary between the floating ice shelf and the anchor ice (resting on bedrock) that feeds it is called the grounding line.. The thickness of ice shelves .
 Simulations of frigid Neoproterozoic climates have not considered the tendency of thick layers of floating marine ice to deform and spread laterally. We have constructed a simple model of the production and flow of marine ice on a planetary scale, and determined ice thickness and flow in two situations: when the ocean is globally ice‐covered (“hard snowball”) and when the tropical Cited by: Ice sheet dynamics describe the motion within large bodies of ice, such those currently on Greenland and motion is dominated by the movement of glaciers, whose gravity-driven activity is controlled by two main variable factors: the temperature and strength of their bases.A number of processes alter these two factors, resulting in cyclic surges of activity .
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Flow of floating and grounded ice sheets. Author: Zainuddin, Roziati. ISNI: Awarding Body: University of East Anglia Current Institution: University of East Anglia Date of Award: Availability of Full Text: Full text unavailable from EThOS.
While the flow dynamics of grounded ice are dominated by shear and controlled by basal drag, the flow of floating ice is drag free and dominated by pushes and pulls due to membrane stresses (Pattyn, ; Rignot et al., a; Schoof, ).Author: Peter Friedl, Frank Weiser, Frank Weiser, Anke Fluhrer, Matthias H.
Braun. The existence of a channelized hydrological system has implications for the behaviour and dynamics of ice sheets and ice shelves near the grounding lines of ice Cited by: The area over which that interaction occurs might include the base and front of a floating extension of the grounded ice, called an ice shelf, or could be limited to the submerged portion of a near-vertical ice wall terminating a tidewater glacier that is too thick to float Cited by: A: Schematic diagram of the position of the grounding zone at the margin of an ice sheet with a floating ice shelf.
B: Schematic diagram of the position of the grounding zone at a tidewater ice-sheet margin. C: Typical ice-stream landform assemblage produced by fast, ice-stream flow on a continental margin (adapted from Ottesen and Dowdeswell, Cited by: We present a reference, comprehensive, high-resolution, digital mosaic of ice motion in Antarctica assembled from multiple satellite interferometric synthetic-aperture radar data acquired during the International Polar Year to The data reveal widespread, patterned, enhanced flow with tributary glaciers reaching hundreds to thousands of kilometers Cited by: Grounding‐zone wedges (GZWs) mark the grounding terminus of flowing marine‐based ice streams and, in the presence of an ice shelf, the transition from grounded ice to floating ice.
The ice dynamics in this model are a combination of (i) internal shearing flow (Shallow Ice Approximation, SIA) for grounded ice, and (ii) stretching flow. The Canadian Hydrographic Service glossary defines two terms that describe stationary ice: "grounded ice" is floating ice that is temporarily aground in shoal water, while "stranded ice" is ice that, after floating, has been deposited on the shore by retreating high water.
However, floating ice shelves that fringe the ice sheet act to restrain the flow of inland, grounded ice, preventing or forestalling unstable retreat (Dupont &. Ice shelves are floating ice sheets and are found mainly around the Antarctic continent (Figure 1).They can range in size up to km 2 and in thickness up to m.
Most are fed by ice streams and outlet glaciers, but some are formed by icebergs welded together by sea ice and surface accumulation.
Atmospheric and oceanic forcing have the potential to reduce the thickness and extent of floating ice shelves, potentially limiting their ability to buttress the flow of grounded tributary by:  The ice sheet–ice shelf transition zone plays an important role in controlling marine ice sheet dynamics, as it determines the rate at which ice flows out of the grounded part of the ice sheet.
Together with accumulation, this outflow is the main control on the mass balance of the grounded sheet. In this paper, we verify the results of a boundary layer theory for ice flux in the Cited by: Of particular importance is the ice‐sheet response to changes in their floating extensions, called ice shelves.
Shearing of ice shelves past slower‐moving ice or rock causes a backstress [ Thomas and MacAyeal, ], so ice‐shelf thinning or loss leads immediately (stress transmission at the speed of sound) to acceleration of ice. Ice rise experiment.
(a) Marine ice sheet with partly grounded shelf (ice rise). The sheet is cut away to reveal the seamount. (b) Domain after 1 ka. Light grey indicates grounded ice, and floating regions are dark.
(c) The x‐velocity (ma −1) at 1 ka. (d) Domain after 15 ka. The two grounded areas have by: Grounding lines mark the boundary between floating and grounded sections of a marine terminating ice sheet (Thomas et al., ).
They are a sensitive indicator of ice sheet stability and, when migration occurs, can indicate the influence of changes in the local environmental forcing (Joughin et al.,Joughin et al.,Joughin et al.,Dutrieux et al., ).Cited by: 3.
Grounding-zone wedges are typically less than 15 km long and 15 to m thick. • Fast ice-streaming flow is probably necessary for grounding-zone wedge formation. • Ice shelves force wedge formation by restricting vertical accommodation space. • Continental shelf geometry can control the position of still-stands in the ice by: It is widely assumed that the stability of the marine ice sheets, as in the West Antarctic Ice Sheet (WAIS), where ice shelves are formed, is mainly controlled by the dynamics of the grounding line.
The grounding line is the line where transition between ice attached to the solid ground and ice floating over the sea takes by: 1. In our ice flow model, we represent the ice sheet as “blocks” which flow and stretch and melt as they flow.
In reality, an ice sheet is a single entity, rather than a set of blocks. We have to consider the ice as blocks in order to solve the equations for ice flow over space. The ice is represented in the game with a layered texture. This is a physics-based simulation of many s of years of accumulation, flow and melting of arctic and antarctic ice sheets during the last ice age.
Both floating and grounded ice conditions. An ice sheet that spreads into an ocean is forced to bend owing to its buoyancy and detaches from the bedrock to form a floating ice shelf. The location of the transition between the grounded.Scientists produce first evidence that thinning ice sheets in Antarctica are causing more ice to flow into the sea in the thickness of floating ice shelves changes over the grounded ice.Start studying Geology Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Search. Ice shelves are grounded in _____ and float in _____. shallow water; deep water. _____ are former river valleys that were oriented parallel to the direction of ice flow and were scoured deeper by advancing glacial ice.