Thermal Refraction: Impactions for Subglacial Heat Flux

Simon Willcocks; Derrick Hasterok

doi:10.1080/22020586.2019.12072986

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Thermal Refraction: Impactions for Subglacial Heat Flux
Authors Simon Willcocks^a and Derrick Hasterok^b
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^a University of Adelaide, Adelaide, SA, 5005, [email protected] ^b University of Adelaide, Adelaide, SA, 5005, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 4
DOI: https://doi.org/10.1080/22020586.2019.12072986
- Published online: 01 Dec 2019

Abstract

Summary

Numerical models of glaciers suggest variations in geothermal heat flux influences basal melting. In this study, we demonstrate the effect of thermal refraction on heat flux variations at the glacial-basement interface using a finite difference approximation of the 2D, steady-state, heat flow equation. Thermal refraction occurs as a result of variations in subglacial topography where the thermal conductivity of glacial ice and the solid Earth differ, or in the absence of subglacial topography where contacts between differing conductivity rocks exist. Both models are incompatible with prior topographic-based models of subglacial heat flux. Heat flux can preferentially flow into or around a subglacial valley depending on the thermal conductivity contrast with surrounding rock, with magnitudes at the glacial-basement interface ±20 to 40% of regional geothermal heat flux.

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2026-01-18

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References

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/content/journals/10.1080/22020586.2019.12072986

Article Type: Research Article

Keyword(s): Heat Flow; Subglacial Topography; Thermal Conductivity; Thermal Refraction

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