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Imaging Brine Infiltration and Basal Marine Ice in Larsen C Ice Shelf, Antarctic Peninsula, From Borehole Measurements and Transient Electromagnetics
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Katie E. Miles ,
Bryn Hubbard ,
Adrian Luckman ,
Sarah S. Thompson ,
Glenn Jones,
Benjamin K. Galton‐Fenzi
Geophysical Research Letters, Volume: 52, Issue: 17
Swansea University Authors:
Siobhan Killingbeck, Bernd Kulessa , Adrian Luckman
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DOI (Published version): 10.1029/2025gl115908
Abstract
The presence and nature of marine ice in ice shelves is important, yet difficult to determine. We present transient electromagnetic results spanning 10 km across a suture zone of Larsen C Ice Shelf (LCIS), Antarctica, supported by central borehole measurements. Our results indicate the presence of t...
| Published in: | Geophysical Research Letters |
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| ISSN: | 0094-8276 1944-8007 |
| Published: |
American Geophysical Union (AGU)
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa70133 |
| Abstract: |
The presence and nature of marine ice in ice shelves is important, yet difficult to determine. We present transient electromagnetic results spanning 10 km across a suture zone of Larsen C Ice Shelf (LCIS), Antarctica, supported by central borehole measurements. Our results indicate the presence of two ice-shelf layers. The uppermost layer, ∼300 m thick, has resistivity 103−106 Ωm. We interpret this as meteoric ice, overlying a lower shelf layer 25–56 m thick with resistivity 3–20 Ωm, consistent with permeable basal marine ice. This reconstruction closely matches modeled marine-ice thicknesses in the area. The porosity of this layer is 0.18–0.40, higher than measured farther down-flow, suggesting the layer consolidates once formed. Within the upper layer at 78.5 m depth, we identify a 2.5 m thick layer, likely linked to brine infiltration. These heterogeneities in ice shelf properties should be accounted for in future LCIS stability assessments. |
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| College: |
Faculty of Science and Engineering |
| Funders: |
NERC (Grant Number: NE/T008016/1) |
| Issue: |
17 |