Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream [PDF]
Nature Communications, 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 ...
Tamara Annina Gerber +22 more
doaj +3 more sources
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream. [PDF]
Nat Commun, 2022 Mass loss near the ice-sheet margin is evident from remote sensing as frontal retreat and increases in ice velocities. Velocities in the ice sheet interior are orders of magnitude smaller, making it challenging to detect velocity change. Here, we analyze
Grinsted A +8 more
europepmc +7 more sources
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream. [PDF]
Nature, 2022 Over the past two decades, ice loss from the Greenland ice sheet (GrIS) has increased owing to enhanced surface melting and ice discharge to the ocean1–5.
Khan SA +9 more
europepmc +2 more sources
Thermal controls on ice stream shear margins
Journal of Glaciology, 2021 Ice stream discharge responds to a balance between gravity, basal friction and lateral drag. Appreciable viscous heating occurs in shear margins between ice streams and adjacent slow-moving ice ridges, altering the temperature-dependent viscosity ...
Pierce Hunter +4 more
doaj +2 more sources
Ice-stream demise dynamically conditioned by trough shape and bed strength. [PDF]
Sci Adv, 2019 We show how the shape and strength of an ice stream’s bed can drive step changes in retreat rate and hasten ice loss to the ocean. Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves ...
Bradwell T +12 more
europepmc +2 more sources
Instability of the Northeast Greenland Ice Stream over the last 45,000 years. [PDF]
Nat Commun, 2018 The sensitivity of the Northeast Greenland Ice Stream (NEGIS) to prolonged warm periods is largely unknown and geological records documenting such long-term changes are needed to place current observations in perspective.
Larsen NK +7 more
europepmc +2 more sources
The role of subtemperate slip in thermally driven ice stream margin migration [PDF]
The Cryosphere, 2018 The amount of ice discharged by an ice stream depends on its width, and the widths of unconfined ice streams such as the Siple Coast ice streams in West Antarctica have been observed to evolve on decadal to centennial timescales.
M. Haseloff +4 more
doaj +2 more sources
Troughs developed in ice-stream shear margins precondition ice shelves for ocean-driven breakup. [PDF]
Sci Adv, 2019 Fast-flowing ice shelves may form channels under their margins that promote calving and retreat under warming ocean conditions. Floating ice shelves of fast-flowing ice streams are prone to rift initiation and calving originating along zones of rapid ...
Alley KE +3 more
europepmc +2 more sources
Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream [PDF]
Scientific Reports, 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 ...
Michele Petrini +9 more
doaj +2 more sources
Annals of Glaciology, 2020 Here we use polarimetric measurements from an Autonomous phase-sensitive Radio-Echo Sounder (ApRES) to investigate ice fabric within Whillans Ice Stream, West Antarctica.
Thomas M. Jordan +3 more
doaj +2 more sources