<i>The Physics of Glaciers</i>

Paterson, W. S. B.; Andrews, John T.

doi:10.1063/1.2915138

Cited by 833 publications

(1,368 citation statements)

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“…The overall conclusion reached from these models is that, unless the ice rheology is substantially (two orders of magnitude or more) different than that published (e.g. Paterson, 1981 ), there is no physically reasonable distribution of ' Tb which can explain the observed velocity field when the ice rheology is taken to be uniform across the ice stream. The simple model described does have several assumptions which may not be strictly valid but, as will be seen below, relaxation of some of them in a numerical model does not change this conclusion.…”

Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 78%

“…Any overall softening of the ice can be incorporated into the constant A. Such softening may be due to an error of our assumption about the mean temperature for the ice or some uniform softening related to the strain history of all the ice within the ice stream, which would lead to an error if Paterson's (1981 ) values were assumed.…”

Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 99%

“…Taking the bulk ice temperature as -15°C and the value of A given by Paterson (1981) at this temperature, Equation (9) leads to negative basal shear stresses over much of the bed. This physically unrealistic result is to be expected, as explained above.…”

Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 99%

“…We assume a flow-law exponent ofn = 3 and a representative temperature throughout the ice column of -15°C (see Engelhardt and others, 1990). Using the value of the flow-law parameter A given by Paterson (1981) as 9 1 O -IB P -3 -I h· h h x a a at t IS temperature, t e sear-stress distribution across the ice stream is given by…”

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confidence: 99%

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The role of the margins in the dynamics of an active ice stream

et al. 1994

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ABSTRACT. A transverse profile of velocity was measured across Ice Stream B, West Antarctica, in order to determine the role of the margins in the force balance of an active ice stream. The profile extended from near the ice-stream center line, through a marginal shear zone and on to the slow-moving ice sheet. The velocity profile exhibits a high degree of shear d eformation within a marginal zone, where intense, chaotic crevassing occurs. Detailed analysis of the profile, using analytical and numerical models of ice flow, leads to the following conclusions regarding the roles of the bed and the margins in ice-stre a m dynamics: While the exact quantitative values leading to these conclusions are somewhat model and location-dependent, th e overall conclusions are robust. As such, they are likely to have importa nce for ice-strea m dynamics in gen eral.

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Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 78%

Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 99%

Section: Echelmeyer and Others: Dynamics Of An Active Ice Streammentioning

confidence: 99%

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confidence: 99%

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The role of the margins in the dynamics of an active ice stream

et al. 1994

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“…On a larger scale, global climate change is affected by feedback loops involving water vapor -the most common greenhouse gas -and liquid water [9,10]. Moreover, our environment depends critically on the properties of ice [11,12], both through the rheology of ice sheets [13] and the meteorology of clouds [14]. Ice is also found in interstellar space, where, in an amorphous phase, it coats dust grains in molecular clouds [15,16].…”

Section: Introductionmentioning

confidence: 99%

A transferable H2O interaction potential based on a single center multipole expansion: SCME

Wikfeldt

Batista

Vila

et al. 2013

Phys. Chem. Chem. Phys.

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Abstract. A transferable potential energy function for describing the interaction between water molecules is presented. The electrostatic interaction is described rigorously using a multipole expansion. Only one expansion center is used per molecule to avoid the introduction of monopoles. This single center approach turns out to converge and give close agreement with ab initio calculations when carried out up to and including the hexadecapole. Both dipole and quadrupole polarizability is included. All parameters in the electrostatic interaction as well as the dispersion interaction are taken from ab initio calculations or experimental measurements of a single water molecule. The repulsive part of the interaction is parametrized to fit ab initio calculations of small water clusters and experimental measurements of ice I h . The parametrized potential function was then used to simulate liquid water and the results agree well with experiment, even better than simulations using some of the point charge potentials fitted to liquid water. The evaluation of the new interaction potential for condensed phases is fast because point charges are not present and the interaction can, to a good approximation, be truncated at a finite range.

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Geothermal control on flow patterns in the Last Glacial Maximum ice sheet of Iceland

Bourgeois

Dauteuil

Vliët-Lanoé

2000

Earth Surf. Process. Landforms

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Because it is located both on the Mid-Atlantic Ridge and on a mantle plume, Iceland is a region of intense tectonics and volcanism. During the last glaciation, the island was covered by an ice sheet approximately 1000 m thick. A reconstruction of the ice flow lines, based on glacial directional features, shows that the ice sheet was partly drained through fast-flowing streams. Fast flow of the ice streams has been recorded in megascale lineations and flutes visible on the currently deglaciated bedrock, and is confirmed by simple mass balance considerations. Locations of the major drainage routes correlate with locations of geothermal anomalies, suggesting that ice stream activity was favoured by lubrication of the bed by meltwater produced in regions of high geothermal heat flux. Similar control of ice flow by geothermal activity is expected in ice sheets currently covering tectonically and volcanically active area such as the West Antarctic ice sheet.

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The Physics of Glaciers

Cited by 833 publications

References 0 publications

The role of the margins in the dynamics of an active ice stream

The role of the margins in the dynamics of an active ice stream

A transferable H2O interaction potential based on a single center multipole expansion: SCME

Geothermal control on flow patterns in the Last Glacial Maximum ice sheet of Iceland

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