Elevated geothermal surface heat flow in the Amundsen Sea Embayment, West Antarctica

Dziadek, R. and Gohl, K. and Kaul, N. and Uenzelmann-Neben, Gabriele and Hochmuth, Katharina and Riefstahl, Florian and Gebhardt, Catalina and Arndt, Jan-Erik and Klages, Johann and Esper, Oliver and Ronge, Thomas and Kuessner, Kevin and Kuehn, Gerhard and Larter, Robert and Hillenbrand, Claus-Dieter and Smith, James and Bickert, Torsten and Palike, Heiko and Frederichs, Thomas and Freudenthal, Tim and Zundel, Maximilian and Spiegel, Cornelia and Ehrmann, Werner and Bohaty, Steve and van de Flierdt, Tina and Pereira, Simoes Patric and Najman, Yani and Scheinert, Mirko and Ebermann, Benjamin and Afanasyeva, Victoria (2019) Elevated geothermal surface heat flow in the Amundsen Sea Embayment, West Antarctica. Earth and Planetary Science Letters, 506. pp. 530-539. ISSN 0012-821X

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Abstract

The thermal state of polar continental crust plays a crucial role for understanding the stability and thickness of large ice sheets, the visco-elastic response of the solid Earth due to unloading when large ice caps melt and, in turn, the accuracy of future sea-level rise prediction. Various studies demonstrate the need for precise measurements and estimation of geothermal heat flow (GHF) in Antarctica for better constrained boundary conditions to enhance the ice sheet model performance. This study provides ground-truth for regional indirect GHF estimates in the Amundsen Sea Embayment, which is part of the West Antarctic Rift System, by presenting in situ temperature measurements in continental shelf sediments. Our results show regionally elevated and heterogeneous GHF (mean of 65 mW m(-2)) in the Amundsen Sea Embayment. Considering thermal blanketing effects, induced by inflow of warmer water and sedimentary processes, the estimated GHF ranges between 65 mW m(-2) and 95 mW m(-2). (C) 2018 Elsevier B.V. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Earth and Planetary Science Letters
Additional Information:
This is the author’s version of a work that was accepted for publication in Earth and Planetary Science Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Earth and Planetary Science Letters, 506, 2019 DOI: 10.1016/j.epsl.2018.11.003
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
131063
Deposited By:
Deposited On:
05 Feb 2019 10:20
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2020 08:57