Results 31 to 40 of about 8,101 (169)

A model for spiral flows in basal ice and the formation of subglacial flutes based on a Reiner‐Rivlin rheology for glacial ice [PDF]

Journal of Geophysical Research: Solid Earth, 2008
Flutes are elongated sediment ridges formed at the base of glaciers and ice sheets. In this paper, we show that flutes can be the product of a corkscrew‐like spiral flow in basal ice that removes sediment from troughs between flutes and deposits it at their crests, as first suggested by Shaw and Freschauf.
Christian G. Schoof, Garry K. C. Clarke
openaire   +1 more source

Inferences of mantle viscosity based on ice age data sets: Radial structure [PDF]

, 2016
We perform joint nonlinear inversions of glacial isostatic adjustment (GIA) data, including the following: postglacial decay times in Canada and Scandinavia, the Fennoscandian relaxation spectrum (FRS), late-Holocene differential sea level (DSL ...

core   +2 more sources

Effects of microparticles on deformation and microstructural evolution of fine-grained ice

Journal of Glaciology, 2019
We investigated the effects of microparticles and grain size on the microstructural evolutions and mechanical properties of polycrystalline ice. Uniaxial compression tests were conducted using fine-grained pure ice and silica-dispersed ice under various ...
TOMOTAKA SARUYA, KOKI NAKAJIMA, MORIMASA TAKATA, TOMOYUKI HOMMA, NOBUHIKO AZUMA, KUMIKO GOTO-AZUMA   +5 more
doaj   +1 more source

MCMC inversion of the transient and steady-state creep flow law parameters of dunite under dry and wet conditions

Earth, Planets and Space, 2021
The rheology of the upper mantle impacts a variety of geodynamic processes, including postseismic deformation following great earthquakes and post-glacial rebound.
Sagar Masuti, Sylvain Barbot
doaj   +1 more source

Hydraulic and mechanical properties of glacial sediments beneath Unteraargletscher, Switzerland: implications for glacier basal motion [PDF]

, 2001
The force on a ‘ploughmeter’ and subglacial water pressure have been measured in the same borehole at Unteraargletscher, Switzerland, in order to investigate ice–sediment coupling and the motion at the base of a soft-bedded glacier.
Agassiz, Agassiz, Alley, Alley, Alley, Bear, Blake, Blankenship, Boulton, Brown, Campanella, Carslaw, Engelhardt, Engelhardt, Engelhardt, Fischer, Fischer, Fischer, Fischer, Fischer, Flotron, Freeze, Funk, Funk, Gudmundsson, Gudmundsson, Gudmundsson, Gudmundsson, Head, Hooke, Hugi, Hugi, Humphrey, Iken, Iken, Iverson, Iverson, Iverson, Iverson, Iverson, Janbu, Kamb, Knecht, Lambe, Malyshev, Mitchell, Murray, Murray, Porter, Porter, Press, Ruiter, Röthlisberger, Senneset, Skempton, Truffer, Tulaczyk, Weertman   +57 more
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Global Glacial Isostatic Adjustment Constrained by GPS Measurements: Spherical Harmonic Analyses of Uplifts and Geopotential Variations

Remote Sensing, 2020
In addition to studies of sea level change and mantle rheology, reliable Glacial Isostatic Adjustment (GIA) models are necessary as a background model to correct the widely used Gravity Recovery and Climate Experiment (GRACE) monthly gravity solutions to
Yan Zhou, Shaomin Yang, Jiesi Luo, Jim Ray, Yong Huang, Jiancheng Li   +5 more
doaj   +1 more source

Glare, a GIS tool to reconstruct the 3D surface of palaeoglaciers [PDF]

, 2016
Acknowledgements This research has been supported by the Leverhulme Trust International Network Grant IN-2012-140. Processing and collecting of ground penetrating data in Forgefonna was part of Elend Førre's master's project that was completed in 2009 at
Bakke, Jostein, Frew, Craig R, Hughes, Philip, Ivy-Ochs, Susan, Lukas, Sven, Pellitero-Ondicol, Ramon, Rea, Brice R, Renssen, Hans, Ribolini, Adriano, Spagnolo, Matteo   +9 more
core   +4 more sources

The Influence of the Solid Earth on the Contribution of Marine Sections of the Antarctic Ice Sheet to Future Sea‐Level Change

Geophysical Research Letters, 2022
Seismic tomography models indicate highly variable Earth structure beneath Antarctica with anomalously low shallow mantle viscosities below West Antarctica.
M. Yousefi, J. Wan, L. Pan, N. Gomez, K. Latychev, J. X. Mitrovica, D. Pollard, R. M. DeConto   +7 more
doaj   +1 more source

A steady-state model reconstruction of the patagonian ice sheet during the last glacial maximum

Quaternary Science Advances, 2023
During the Last Glacial Maximum (LGM), the Patagonian Ice Sheet (PIS) was the largest Quaternary ice mass in the Southern Hemisphere outside of Antarctica. Although the margins of the LGM ice sheet are now well established through end-moraine mapping and
Ingo W. Wolff, Neil F. Glasser, Stephan Harrison, Joanne Laura Wood, Alun Hubbard   +4 more
doaj   +1 more source

Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies

Geophysical Journal International, 2017
Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov chain formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and the volumes of the ice sheets, using as starting ...
Caron, L., Métivier, L., Greff-Lefftz, M., Fleitout, L., Rouby, H.   +4 more
openaire   +2 more sources