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Record #96610:

Model studies on ice-stream surging / Uwe Radok, B.J. McInnes, Dick Jenssen, William F. Budd.

Title: Model studies on ice-stream surging / Uwe Radok, B.J. McInnes, Dick Jenssen, William F. Budd.
Author(s): Radok, Uwe.
McInnes, B. J.
Jenssen, Dick.
Budd, William F.
Date: 1989.
Publisher: Cambridge: International Glaciological Society
In: Annals of Glaciology. (1989.), Vol. 12 (1989)
Abstract: Self-surging glacier model, in which basal sliding is parameterized in terms of energy per unit area dissipated by basal friction, is extended to model steady-state and time-dependent behaviour of eight Antarctic ice streams. Basic characteristics were established with working hypothesis of steady-state mass balance for whole ice sheet, using 20 km grid digitization of surface and bedrock-elevation contours in Antarctic folio (Drewry 1983). When viscosity of ice is lowered to values that are somewhat unrealistic for present Antarctic ice, all model ice streams enter pulsating fast-sliding mode of flow in which velocity reaches several km a⁻¹ for periods ranging from fractions of year to tens of years. Except for one ice stream (Slessor Glacier), no substantial surge-like advances were found, and no periodic surging regime developed even in that one case. Pulses are tentatively attributed to processes at grounding line, with converging width-parameterization scheme in surging velocity calculation as another complexity that is still being investigated. Concludes that special regime and topography of ice streams impede onset of periodic surging.
Notes:

Annals of Glaciology. Vol. 12 :132-137 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.65 -- Land ice, surges and catastrophic changes.
E5 -- Glaciology: land ice.
(*7) -- Antarctic regions.
SPRI record no.: 96610

MARCXML

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245 00 ‡aModel studies on ice-stream surging /‡cUwe Radok, B.J. McInnes, Dick Jenssen, William F. Budd.
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500 ## ‡aAnnals of Glaciology. Vol. 12 :132-137 (1989).
520 3# ‡aSelf-surging glacier model, in which basal sliding is parameterized in terms of energy per unit area dissipated by basal friction, is extended to model steady-state and time-dependent behaviour of eight Antarctic ice streams. Basic characteristics were established with working hypothesis of steady-state mass balance for whole ice sheet, using 20 km grid digitization of surface and bedrock-elevation contours in Antarctic folio (Drewry 1983). When viscosity of ice is lowered to values that are somewhat unrealistic for present Antarctic ice, all model ice streams enter pulsating fast-sliding mode of flow in which velocity reaches several km a⁻¹ for periods ranging from fractions of year to tens of years. Except for one ice stream (Slessor Glacier), no substantial surge-like advances were found, and no periodic surging regime developed even in that one case. Pulses are tentatively attributed to processes at grounding line, with converging width-parameterization scheme in surging velocity calculation as another complexity that is still being investigated. Concludes that special regime and topography of ice streams impede onset of periodic surging.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.65 -- Land ice, surges and catastrophic changes.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
700 1# ‡aRadok, Uwe.
700 1# ‡aMcInnes, B. J.
700 1# ‡aJenssen, Dick.
700 1# ‡aBudd, William F.
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