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A new heat flux model incorporating variable crustal radiogenic heat production

conference contribution
posted on 2023-05-24, 18:31 authored by Burton-Johnson, A, Jacqueline HalpinJacqueline Halpin, Joanne WhittakerJoanne Whittaker, Felicity McCormack, Watson, S
We present findings recently published in GRL (Burton-Johnson et al., 2017) on the variability of Antarctic subglacial heat flux and the impact from upper crustal geology. Our new method reveals that the upper crust contributes up to 70% of the Antarctic Peninsula's subglacial heat flux, and that heat flux values are more variable at smaller spatial resolutions than geophysical methods can resolve. Results indicate a higher heat flux on the east and south of the Peninsula (mean 81 mWm-2) where silicic rocks predominate, than on the west and north (mean 67 mWm-2) where volcanic arc and quartzose sediments are dominant. Whilst the data supports the contribution of HPE-enriched granitic rocks to high heat flux values, sedimentary rocks can be comparable dependent on their provenance and petrography. Models of subglacial heat flux must utilize a heterogeneous upper crust with variable radioactive heat production if they are to accurately predict basal conditions of the ice sheet. Our new methodology and dataset facilitate improved numerical model simulations of ice sheet dynamics. The most significant challenge faced remains accurate determination of crustal structure, particularly the depths of the HPE-enriched sedimentary basins and the sub-glacial geology away from exposed outcrops. Continuing research (particularly detailed geophysical interpretation) will better constrain these unknowns and the effect of upper crustal geology on the Antarctic ice sheet.

History

Publication title

POLAR2018 Open Science Conference Abstract Proceedings

Pagination

2478

Department/School

Institute for Marine and Antarctic Studies

Event title

POLAR2018

Event Venue

Davos, Switzerland

Date of Event (Start Date)

2018-06-19

Date of Event (End Date)

2018-06-23

Repository Status

  • Restricted

Socio-economic Objectives

Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts); Expanding knowledge in the earth sciences

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