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Record #96623:
- #96623
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MARC recordDerivation 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 |
LDR 01920naa#a2200000#a#4500 001 SPRI-96623 005 20230402122134.0 007 ta 008 230402s1989####enk###|##|###|0||#0|eng#d 035 ## ‡aSPRI-96623 040 ## ‡aUkCU-P‡beng‡eaacr 100 1# ‡aDahl-Jensen, D. 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. 260 ## ‡aCambridge :‡bInternational Glaciological Society,‡c1989. 300 ## ‡ap. 200-201. 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 700 1# ‡aGundestrup, N. S. 773 0# ‡7nnas ‡tAnnals of Glaciology. ‡gVol. 12 (1989) ‡wSPRI-60773 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20230402