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Studying the effects of strain heating on glacial flow within outlet glaciers from the Heimefrontfjella Range, Dronning Maud Land, Antarctica
Responsible organisation
2003 (English)In: ANNALS OF GLACIOLOGY, VOL 37, Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden., 2003, 134-142 p.Conference paper, Published paper (Refereed)
Abstract [en]

A one-dimensional numerical thermodynamic model is used to study the effects of strain heating on temperature profiles along the flowline of two outlet glaciers in Dronning Maud Land, Antarctica, flowing down a steep escarpment. Measurements of ice surface velocities on the glaciers show higher speeds than surface speeds calculated using Glen's flow lawn These calculations are based on ice-temperature distributions excluding strain heating in the general heat equation. The incorporation of strain heating in the general heat equation produces higher ice temperatures, and calculated ice surface speeds that are close to the measured values. It is found that relatively short-scale temporal and spatial steps in basal topography are enough to drive the ice flow into a positive feedback loop as long as the bedrock step produces a stress that overcomes the advection of cool ice from the surface. In this case, where surface temperatures are -25degreesC, stresses of 0.4 MPa are enough to drive the base of the ice to the melting point within 10(2) years.

Place, publisher, year, edition, pages
Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden., 2003. 134-142 p.
Series
ANNALS OF GLACIOLOGY, ISSN 0260-3055 ; 37
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2436DOI: 10.3189/172756403781815843ISI: 000189450700022ISBN: 0-946417-32-6 (print)OAI: oai:DiVA.org:polar-2436DiVA: diva2:883543
Conference
International Symposium on Physical and Mechanical Processes om Ice in Relation to Glacier and Ice-Sheet Modelling, AUG 25-30, 2002, Chamonix, FRANCE
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2015-12-17

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf