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Record #164645:

Dynamical processes involved in the retreat of marine ice sheets / Richard C.A. Hindmarsh, E. Le Meur.

Title: Dynamical processes involved in the retreat of marine ice sheets / Richard C.A. Hindmarsh, E. Le Meur.
Author(s): Hindmarsh, Richard C. A.
Le Meur, E.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(157) (2001)
Abstract: Seeks to understand how neutral equilibrium property of marine ice sheets organizes their dynamics and to demonstrate that mechanisms previously used to explain marine ice sheet retreat are inadequate. Describes model, solution procedure and model experiments, designed to be representative of Siple Coast/Ross Sea area. Shows that use of static hydraulics to model ice stream behaviour can lead to a substantial retreat that is delayed with respect to post glacial sea level rise, but argues that such models are inconsistent with field evidence. Step changes in accumulation rate or rate factor produce far larger changes in ice sheet thickness than in span. Concludes retreat of the West Antarctic Ice Sheet not caused directly by postglacial forcing (e.g. step temperature change or sea level rise). Finds that thermally induced fluctuations in ice sheet viscosity can lead to a noise-induced drift phenomenon which may be a significant mechanism in controlling retreat. Compares work with other modelling efforts, pointing out that only the present model demonstrates dynamical consistency with corresponding differential equations. See erratum in ibid., 2002, 48(160) :174.
Notes:

Journal of Glaciology. Vol. 47(157) :271-282 (2001).

Keywords: 551.324 -- Land ice.
551.324.4 -- Land ice, mass and energy balance.
551.461.2 -- Sea level, fluctuations.
551.324.5 -- Land ice, flow.
551.324.63 -- Land ice, advance and retreat.
519.673 -- Modelling.
.000(410) -- British author.
E5 -- Glaciology: land ice.
(*7) -- Antarctic regions.
(*767.5) -- Siple Coast.
SPRI record no.: 164645

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520 3# ‡aSeeks to understand how neutral equilibrium property of marine ice sheets organizes their dynamics and to demonstrate that mechanisms previously used to explain marine ice sheet retreat are inadequate. Describes model, solution procedure and model experiments, designed to be representative of Siple Coast/Ross Sea area. Shows that use of static hydraulics to model ice stream behaviour can lead to a substantial retreat that is delayed with respect to post glacial sea level rise, but argues that such models are inconsistent with field evidence. Step changes in accumulation rate or rate factor produce far larger changes in ice sheet thickness than in span. Concludes retreat of the West Antarctic Ice Sheet not caused directly by postglacial forcing (e.g. step temperature change or sea level rise). Finds that thermally induced fluctuations in ice sheet viscosity can lead to a noise-induced drift phenomenon which may be a significant mechanism in controlling retreat. Compares work with other modelling efforts, pointing out that only the present model demonstrates dynamical consistency with corresponding differential equations. See erratum in ibid., 2002, 48(160) :174.
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