Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier

Huang, Yan; Zhao, Liyun; Wolovick, Michael; Ma, Yiliang; Moore, John C.

doi:https://doi.org/10.5194/tc-18-103-2024

Articles | Volume 18, issue 1

https://doi.org/10.5194/tc-18-103-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/tc-18-103-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 1

Research article

|

04 Jan 2024

Research article |

| 04 Jan 2024

Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier

Yan Huang, Liyun Zhao, Michael Wolovick, Yiliang Ma, and John C. Moore

Data sets

MEaSUREs BedMachine Antarctica, Version 2 [Data Set]. Boulder, Colorado USA M. Morlighem https://doi.org/10.5067/E1QL9HFQ7A8M

MEaSUREs InSAR-Based Antarctica Ice Velocity Map, Version 2 E. Rignot, J. Mouginot, and B. Scheuchl https://doi.org/10.5067/D7GK8F5J8M8R

MEaSUREs Antarctic Boundaries for IPY 2007-2009 from Satellite Radar, Version 2 J. Mouginot, B. Scheuchl, and E. Rignot. https://doi.org/10.5067/AXE4121732AD

Aurora Subglacial Basin GlaDs inputs, outputs and geophysical data C. Dow https://doi.org/10.5281/zenodo.3525474

Antarctic dataset in NetCDF format Anne M. Le Brocq, Antony J. Payne, and Andreas Vieli https://doi.org/10.1594/PANGAEA.734145

Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities (http://www.seismolab.org/model/antarctica/lithosphere/AN1-HF.tar.gz) Meijian An, Douglas A. Wiens, Yue Zhao, Mei Feng, Andrew Nyblade, Masaki Kanao, Yuansheng Li, Alessia Maggi, and Jean-Jacques Lévêque https://doi.org/10.1002/2015JB011917

A geothermal heat flux map of Antarctica empirically constrained by seismic structure (https://sites.google.com/view/weisen/research-products?authuser=0) W. Shen, D. A. Wiens, A. J. Lloyd, and A. A. Nyblade https://doi.org/10.1029/2020gl086955

Antarctic geothermal heat flux distribution and estimated Curie Depths, links to gridded files Yasmina M. Martos https://doi.org/10.1594/PANGAEA.882503

otten Glacier Thermal Structure L. Zhao, M. Wolovick, Y. Huang, J. Moore, and Y. Ma https://doi.org/10.5281/zenodo.7825456

Subglacial lakes and their changing role in a warming climate (https://static-content.springer.com/esm/art%3A10.1038%2Fs43017-021-00246-9/MediaObjects/43017_2021_246_MOESM1_ESM.xlsx) S. J. Livingstone et al. https://doi.org/10.1038/s43017-021-00246-9

Geothermal heat flux data set based on low resolution observations collected by the CHAMP satellite between 2000 and 2010, and produced from the MF-6 model following the technique described in Fox Maule et al. (2005) M. Purucker https://core2.gsfc.nasa.gov/research/purucker/heatflux_mf7_foxmaule05.txt

Short summary

Geothermal heat flux (GHF) is an important factor affecting the basal thermal environment of an ice sheet and crucial for its dynamics. But it is poorly defined for the Antarctic ice sheet. We simulate the basal temperature and basal melting rate with eight different GHF datasets. We use specularity content as a two-sided constraint to discriminate between local wet or dry basal conditions. Two medium-magnitude GHF distribution maps rank well, showing that most of the inland bed area is frozen.