Results 61 to 70 of about 1,037,031 (170)
Quantifying subglacial roughness and its link to glacial geomorphology and ice speed [PDF]
, 2013 The shape of subglacial bed topography, termed its roughness, is a recognised control on basal ice-flow. Although glaciologists have observed patterns of variations in ice speed over beds with different roughness values, the strength of this relationship
PRESCOTT, PHILIP,WILLIAM
core
Tides and the flow of Rutford Ice Stream, West Antarctica [PDF]
, 2007 [1] Surface speeds of Rutford Ice Stream, West Antarctica, are known to vary by around 10–20% (depending on location) with a fortnightly periodicity corresponding to a springneap tidal cycle. The reasons for these periodic variations in flow are unclear.
Gudmundsson, Hilmar +1 more
core +2 more sources
Ice-sheet surging and ice-stream formation [PDF]
Annals of Glaciology, 1996 A simplified model of ice-sheet behaviour is described. It combines the assumptions of rapid ice flow, high viscous activation energy and realistic sediment-based sliding dynamics to form a non-linear diffusion-type equation which can display relaxation oscillations analogous to those of surging glaciers, and which may be relevant to large-scale surges
A. C. Fowler, C. Johnson
openaire +1 more source
Trimlines, blockfields and the vertical extent of the last ice sheet in southern Ireland [PDF]
, 2015 The research reported here was supported by UK NERC grant NER/B/S/2001/0919Trimlines separating glacially abraded lower slopes from blockfield-covered summits on Irish mountains have traditionally been interpreted as representing the upper limit of the ...
Stone, John O. +3 more
core +1 more source
, 2017 We present new data regarding the past dynamics of Marguerite Trough Ice Stream, George VI Ice Shelf and valley glaciers from Ablation Point Massif on Alexander Island, Antarctic Peninsula.
John L. Smellie (2843852)
core +3 more sources
Double Reflections in Polarized Radar Data Reveal Ice Fabric in the North East Greenland Ice Stream
Geophysical Research LettersThe orientation of ice crystals within large ice masses has a strong influence on their mechanical properties, but cannot be directly observed from the surface.
Niels F. Nymand +7 more
doaj +1 more source
High basal melting forming a channel at the grounding line of Ross Ice Shelf, Antarctica
Geophysical Research Letters, 2016 Antarctica's ice shelves are thinning at an increasing rate, affecting their buttressing ability. Channels in the ice shelf base unevenly distribute melting, and their evolution provides insight into changing subglacial and oceanic conditions.
Oliver J. Marsh +6 more
doaj +1 more source
Persistence and variability of ice-stream grounding lines on retrograde bed slopes [PDF]
The Cryosphere, 2016 In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow.
A. A. Robel, C. Schoof, E. Tziperman
doaj +1 more source
Ice flow in the northeast Greenland ice stream [PDF]
Annals of Glaciology, 2000 AbstractWe have measured ice flow and detailed topography in northeastern Greenland using satellite-based synthetic-aperture radar (SAR) interferometry. The subject of this study is the large ice stream that drains this quadrant of the ice sheet. A single SAR interferogram allows the measurement of one component of motion over a several-day-long ...
Joughin, IR, Fahnestock, M, Bamber, JL
openaire +1 more source
Surface undulations of Antarctic ice streams tightly controlled by bedrock topography [PDF]
The Cryosphere, 2013 Full Stokes flow-line models predict that fast-flowing ice streams transmit information about their bedrock topography most efficiently to the surface for basal undulations with length scales between 1 and 20 times the mean ice thickness.
J. De Rydt +3 more
doaj +1 more source