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344 - Towards a reconciled heat flow map for Antarctica: Aq1
Citation
Staal, T and Reading, AM and Halpin, J and Whittaker, J, 344 - Towards a reconciled heat flow map for Antarctica: Aq1, Scientific Committee on Antarctic Research (SCAR) Open Science Conference 2020: Antarctic - Global Connections, 3-7 August 2020, Online (2020) [Conference Extract]
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Abstract
Subglacial heat flow is used as a boundary condition for ice sheet models and in understanding the tectonic
development and properties of the lithosphere. Existing Antarctic heat flow estimates at continental scale
are based on univariate modelling of a geothermal gradient and do not agree. Disparities arise from
assumptions regarding lithospheric properties such as crustal heat production, upper mantle composition
and dynamic neotectonics.
We employ a 'similarity approach' that compares Antarctic observables with observables linked to existing
high-quality heat flow measurements from global compilations. Previous studies that use similarity to
interpolate heat flow values elsewhere, utilise datasets that do not extend to the Antarctic interior with
sufficient reliability. Here, we optimise the similarity approach for existing Antarctic geophysical and
geological datasets by applying a careful sensitivity analysis and introduce weighting of observables.
Observables used include topography, distance to volcanoes, geophysical data sets, and derived products
such as depth to Curie temperature isotherm, seismic wave speed and curvature of gravity field. We also
include geological observations. In total, 15 observables are used.
The new heat flow map, Aq1, is presented together with uncertainty and measures of information entropy
in widely used formats. We also provide the complete workflow as open source Python code relying on the
agrid package. The complete computational framework allows for testing of alternative inputs and updates
as new data becomes available.
Item Details
Item Type: | Conference Extract |
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Keywords: | heat flow, Antarctica, multivariate |
Research Division: | Engineering |
Research Group: | Fluid mechanics and thermal engineering |
Research Field: | Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Staal, T (Dr Tobias Staal) |
UTAS Author: | Reading, AM (Professor Anya Reading) |
UTAS Author: | Halpin, J (Dr Jacqueline Halpin) |
UTAS Author: | Whittaker, J (Associate Professor Jo Whittaker) |
ID Code: | 143900 |
Year Published: | 2020 |
Deposited By: | Earth Sciences |
Deposited On: | 2021-04-09 |
Last Modified: | 2021-06-18 |
Downloads: | 0 |
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