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Record #96623:

Derivation of flow-law properties from bore-hole tilt data: discussion of the Dye 3, Camp Century, and Byrd station bore-hole results (abstract) / D. Dahl-Jensen, N.S. Gundestrup.

Title: Derivation of flow-law properties from bore-hole tilt data: discussion of the Dye 3, Camp Century, and Byrd station bore-hole results (abstract) / D. Dahl-Jensen, N.S. Gundestrup.
Author(s): Dahl-Jensen, D.
Gundestrup, N. S.
Date: 1989.
Publisher: Cambridge: International Glaciological Society
In: Annals of Glaciology. (1989.), Vol. 12 (1989)
Abstract: Data from Dye 3 are used to illustrate difficulties associated with use of field measurements to determine flow-law parameters. In 250 m-thick bottom layer of Wisconsin ice, where 80% of deformation occurs, deformation rates are enhanced by varying impurity concentrations and crystal sizes. Data from this region cannot be used to determine flow-law properties until enhanced flow is quantitatively explained. In remaining 1785 m of ice, experimental error on tilting rates in upper 890 m are of same order of magnitude as measurements. This leaves 900 m of ice, in which only 20% of deformation occurs, to determine flow-law parameters. In this region, importance of including longitudinal stress deviators and using stress fields that include variations due to rough bedrock are discussed. Experiences from Dye 3 are used to discuss Camp Century and Byrd station results.
Notes:

Annals of Glaciology. Vol. 12 :200-201 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.51 -- Land ice, theory of flow.
551.324.54 -- Land ice, flow of particular glaciers.
E5 -- Glaciology: land ice.
(*38) -- Greenland.
(*7) -- Antarctic regions.
(*772) -- Byrd Land.
SPRI record no.: 96623

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245 10 ‡aDerivation of flow-law properties from bore-hole tilt data :‡bdiscussion of the Dye 3, Camp Century, and Byrd station bore-hole results (abstract) /‡cD. Dahl-Jensen, N.S. Gundestrup.
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500 ## ‡aAnnals of Glaciology. Vol. 12 :200-201 (1989).
520 3# ‡aData from Dye 3 are used to illustrate difficulties associated with use of field measurements to determine flow-law parameters. In 250 m-thick bottom layer of Wisconsin ice, where 80% of deformation occurs, deformation rates are enhanced by varying impurity concentrations and crystal sizes. Data from this region cannot be used to determine flow-law properties until enhanced flow is quantitatively explained. In remaining 1785 m of ice, experimental error on tilting rates in upper 890 m are of same order of magnitude as measurements. This leaves 900 m of ice, in which only 20% of deformation occurs, to determine flow-law parameters. In this region, importance of including longitudinal stress deviators and using stress fields that include variations due to rough bedrock are discussed. Experiences from Dye 3 are used to discuss Camp Century and Byrd station results.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.51 -- Land ice, theory of flow.‡2udc
650 07 ‡a551.324.54 -- Land ice, flow of particular glaciers.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*38) -- Greenland.‡2udc
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*772) -- Byrd Land.‡2udc
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