scholarly journals The Ward Hunt Ice Shelf: Recent Changes of the Ice Front

1963 ◽  
Vol 4 (34) ◽  
pp. 415-424 ◽  
Author(s):  
G. Hattersley-Smith
Keyword(s):  
Fracture Pattern ◽  
Ellesmere Island ◽  
Ice Shelf

AbstractMassive calving of the Ward Hunt Ice Shelf, northern Ellesmere Island, occurred between August 1961 and April 1962. An estimated 596 km.2 of ice shelf with a volume of 18 to 24 km.3 became detached to form ice islands, five of which are very large with areas ranging from 70 to 140 km.2. The fracture pattern and the subsequent drift of these ice islands are discussed.

scholarly journals The Ward Hunt Ice Shelf: Recent Changes of the Ice Front

1963 ◽  
Vol 4 (34) ◽  
pp. 415-424 ◽  
Author(s):  
G. Hattersley-Smith
Keyword(s):  
Fracture Pattern ◽  
Ellesmere Island ◽  
Ice Shelf

Abstract Massive calving of the Ward Hunt Ice Shelf, northern Ellesmere Island, occurred between August 1961 and April 1962. An estimated 596 km.2 of ice shelf with a volume of 18 to 24 km.3 became detached to form ice islands, five of which are very large with areas ranging from 70 to 140 km.2. The fracture pattern and the subsequent drift of these ice islands are discussed.

scholarly journals Movement of the Ward Hunt Ice Shelf, Ellesmere Island, N.W.T., Canada

1971 ◽  
Vol 10 (59) ◽  
pp. 211-225 ◽  
Author(s):  
E. Dorrer
Keyword(s):  
Power Flow ◽  
Field Work ◽  
Ellesmere Island ◽  
Ice Shelf ◽  
Surface Layers ◽  
Atmospheric Refraction ◽  
Near Surface ◽  
Angle Measurements ◽  
Ice Velocity ◽  
Ice Forces

AbstractThe movement at a marginal location on the Ward Hunt Ice Shelf, northern Ellesmere Island, was determined by repeated survey measurements with theodolite and geodimeter. The purpose and duration of the field work, and reduction of the observational data are described, and the resulting mean ice velocity of 0.53 m year-1is discussed. Strain-rates of a 1 km by 1 km deformation figure are determined. The parametersnandBof Glen’s power flow law are determined by using the equations given by Nye and Weertman. The results are compared with experimental data. Computed ice stresses show that the “ridge-and-trough" structure on the ice shelf surface is not originated by internal ice forces. The elevations of all survey markers have been determined from vertical-angle measurements, and the peculiarities of atmospheric refraction in near-surface layers are discussed.

scholarly journals Volume and area changes of the Milne Ice Shelf, Ellesmere Island, Nunavut, Canada, since 1950

2012 ◽  
Vol 117 (F4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Colleen A. Mortimer ◽  
Luke Copland ◽  
Derek R. Mueller
Keyword(s):  
Ellesmere Island ◽  
Ice Shelf

scholarly journals Modelled fracture and calving on the Totten Ice Shelf

2018 ◽  
Vol 12 (7) ◽  
pp. 2401-2411 ◽  
Author(s):  
Sue Cook ◽  
Jan Åström ◽  
Thomas Zwinger ◽  
Benjamin Keith Galton-Fenzi ◽  
Jamin Stevens Greenbaum ◽  
...  
Keyword(s):  
Sea Level ◽  
Drainage Basin ◽  
Element Model ◽  
Fracture Pattern ◽  
Current Position ◽  
Ice Shelf ◽  
Wide Range ◽  
Grounding Line ◽  
Flow Features ◽  
Calving Rate

Abstract. The Totten Ice Shelf (IS) has a large drainage basin, much of which is grounded below sea level, leaving the glacier vulnerable to retreat through the marine ice sheet instability mechanism. The ice shelf has also been shown to be sensitive to changes in calving rate, as a very small retreat of the calving front from its current position is predicted to cause a change in flow at the grounding line. Therefore understanding the processes behind calving on the Totten IS is key to predicting its future sea level rise contribution. Here we use the Helsinki Discrete Element Model (HiDEM) to show that not all of the fractures visible at the front of the Totten IS are produced locally, but that the across-flow basal crevasses, which are part of the distinctive cross-cutting fracture pattern, are advected into the calving front area from upstream. A separate simulation of the grounding line shows that re-grounding points may be key areas of basal crevasse production, and can produce basal crevasses in both an along- and across-flow orientation. The along-flow basal crevasses at the grounding line may be a possible precursor to basal channels, while we suggest the across-flow grounding-line fractures are the source of the across-flow features observed at the calving front. We use two additional models to simulate the evolution of basal fractures as they advect downstream, demonstrating that both strain and ocean melt have the potential to deform narrow fractures into the broad basal features observed near the calving front. The wide range of factors which influence fracture patterns and calving on this glacier will be a challenge for predicting its future mass loss.

scholarly journals Surface mass balance of the Ward Hunt Ice Rise and Ward Hunt Ice Shelf, Ellesmere Island, Nunavut, Canada

2004 ◽  
Vol 109 (D22) ◽  
pp. n/a-n/a ◽  
Author(s):  
Carsten Braun ◽  
Douglas R. Hardy ◽  
Raymond S. Bradley ◽  
Vicky Sahanatien
Keyword(s):  
Mass Balance ◽  
Ellesmere Island ◽  
Surface Mass Balance ◽  
Ice Shelf ◽  
Surface Mass

The source and calving of ice island ARLIS-II

Polar Record ◽  
1992 ◽  
Vol 28 (165) ◽  
pp. 137-144 ◽  
Author(s):  
Martin O. Jeffries
Keyword(s):  
Ellesmere Island ◽  
Aerial Photographs ◽  
Ice Shelf ◽  
Surficial Geology ◽  
Ellef Ringnes Island ◽  
Existing Data

AbstractOn the basis of existing data on the dimensions, shape, surficial geology, and glaciological structure of ice island ARLIS-II, used in combination with aerial photographs of northernmost Ellesmere Island taken in 1950 and 1959, the source of the ice island is positively identified as the Alfred Ernest Ice Shelf. The duration of the recent drift of ‘Hobson's Choice’ ice island from the vicinity of the Alfred Ernest Ice Shelf to northern Ellef Ringnes Island, used as a model for the duration of the drift of ARLIS-II between the same points, suggests ARLIS-II broke off the ice shelf in approximately 1955.

Recent Changes at the Front of Ward Hunt Ice Shelf, Ellesmere Island, N.W.T.

ARCTIC ◽  
1983 ◽  
Vol 36 (3) ◽  
Author(s):  
Martin O. Jeffries ◽  
Harold Serson
Keyword(s):  
Ellesmere Island ◽  
Ice Shelf
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