Results 21 to 30 of about 471,781 (349)

Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream. [PDF]

Nat Commun, 2023
The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the ...
Gerber TA, Lilien DA, Rathmann NM, Franke S, Young TJ, Valero-Delgado F, Ershadi MR, Drews R, Zeising O, Humbert A, Stoll N, Weikusat I, Grinsted A, Hvidberg CS, Jansen D, Miller H, Helm V, Steinhage D, O'Neill C, Paden J, Gogineni SP, Dahl-Jensen D, Eisen O.   +22 more
europepmc   +2 more sources

Energy balance of ice streams [PDF]

Journal of Glaciology, 2000
AbstractAnalysis of the cross-flow transmission of force from the central parts of a well-lubricated ice stream to its margins shows that there is a corresponding shift in the lateral location of motion-induced heat generation. The rate of basal heat generation in the center can be substantially smaller than the local rate of potential energy loss ...
C. F. Raymond
openaire   +2 more sources

Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream. [PDF]

Sci Rep, 2018
The Barents Sea Ice Sheet was a marine-based ice sheet, i.e., it rested on the Barents Sea floor during the Last Glacial Maximum (21 ky BP). The Bjørnøyrenna Ice Stream was the largest ice stream draining the Barents Sea Ice Sheet and is regarded as an ...
Petrini M, Colleoni F, Kirchner N, Hughes ALC, Camerlenghi A, Rebesco M, Lucchi RG, Forte E, Colucci RR, Noormets R.   +9 more
europepmc   +2 more sources

Sensitivity of Heinrich-type ice-sheet surge characteristics to boundary forcing perturbations [PDF]

Climate of the Past, 2023
Heinrich-type ice-sheet surges are one of the prominent signals of glacial climate variability. They are characterised as abrupt, quasi-periodic episodes of ice-sheet instabilities during which large numbers of icebergs are released from the Laurentide ...
C. Schannwell, U. Mikolajewicz, F. Ziemen, M.-L. Kapsch   +3 more
doaj   +1 more source

Holocene thinning in central Greenland controlled by the Northeast Greenland Ice Stream. [PDF]

Nat Commun
Ice-core records from the interior of the Greenland ice sheet suggest widespread thinning during the Holocene. However, the recurring underestimation of this thinning in numerical models raises concerns about both the veracity of such reconstructions and
Tabone I, Robinson A, Montoya M, Alvarez-Solas J.   +3 more
europepmc   +2 more sources

Shear-margin melting causes stronger transient ice discharge than ice-stream melting in idealized simulations [PDF]

The Cryosphere, 2022
Basal ice-shelf melting is the key driver of Antarctica's increasing sea-level contribution. In diminishing the buttressing force of the ice shelves that fringe the ice sheet, the melting increases the ice discharge into the ocean.
J. Feldmann, R. Reese, R. Reese, R. Winkelmann, R. Winkelmann, A. Levermann, A. Levermann, A. Levermann   +7 more
doaj   +1 more source

Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago. [PDF]

Nat Commun
Only a few localised ice streams drain most of the ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and its temporal variability is crucially important to predict future sea-level change.
Jansen D, Franke S, Bauer CC, Binder T, Dahl-Jensen D, Eichler J, Eisen O, Hu Y, Kerch J, Llorens MG, Miller H, Neckel N, Paden J, de Riese T, Sachau T, Stoll N, Weikusat I, Wilhelms F, Zhang Y, Bons PD.   +19 more
europepmc   +2 more sources

Radar attenuation demonstrates advective cooling in the Siple Coast ice streams

Journal of Glaciology, 2023
Ice streams are warmed by shear strain, both vertical shear near the bed and lateral shear at the margins. Warm ice deforms more easily, establishing a positive feedback loop in an ice stream where fast flow leads to warm ice and then to even faster flow.
Benjamin H. Hills, Knut Christianson, Robert W. Jacobel, Howard Conway, Rickard Pettersson   +4 more
doaj   +1 more source

Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream [PDF]

The Cryosphere, 2019
Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern ice streams are, however, sparse and difficult to collect.
R. D. Larter, K. A. Hogan, C.-D. Hillenbrand, J. A. Smith, C. L. Batchelor, M. Cartigny, A. J. Tate, J. D. Kirkham, J. D. Kirkham, Z. A. Roseby, Z. A. Roseby, G. Kuhn, A. G. C. Graham, J. A. Dowdeswell   +13 more
doaj   +1 more source

Ice-stream flow switching by up-ice propagation of instabilities along glacial marginal troughs [PDF]

The Cryosphere, 2019
Ice-stream networks constitute the arteries of ice sheets through which large volumes of glacial ice are rapidly delivered from the continent to the ocean.
E. Brouard, P. Lajeunesse
doaj   +1 more source