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Law R, Christoffersen P, Hubbard B, Doyle SH, Chudley TR, Schoonman CM, Bougamont M, des Tombe B, Schilperoort B, Kechavarzi C, Booth A, Young TJ. Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. SCIENCE ADVANCES 2021; 7:7/20/eabe7136. [PMID: 33990322 PMCID: PMC8121432 DOI: 10.1126/sciadv.abe7136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 03/26/2021] [Indexed: 06/12/2023]
Abstract
Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier thermodynamics with an exceptionally high-vertical-resolution (~0.65 m), distributed-fiber-optic temperature-sensing profile from a 1043-m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland. We report substantial but isolated strain heating within interglacial-phase ice at 208 to 242 m depth together with strongly heterogeneous ice deformation in glacial-phase ice below 889 m. We also observe a high-strain interface between glacial- and interglacial-phase ice and a 73-m-thick temperate basal layer, interpreted as locally formed and important for the glacier's fast motion. These findings demonstrate notable spatial heterogeneity, both vertically and at the catchment scale, in the conditions facilitating the fast motion of marine-terminating glaciers in Greenland.
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Affiliation(s)
- Robert Law
- Scott Polar Research Institute, University of Cambridge, Cambridge, UK.
| | | | - Bryn Hubbard
- Centre for Glaciology, Aberystwyth University, Aberystwyth, UK
| | - Samuel H Doyle
- Centre for Glaciology, Aberystwyth University, Aberystwyth, UK
| | - Thomas R Chudley
- Scott Polar Research Institute, University of Cambridge, Cambridge, UK
| | | | - Marion Bougamont
- Scott Polar Research Institute, University of Cambridge, Cambridge, UK
| | - Bas des Tombe
- Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands
| | - Bart Schilperoort
- Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands
| | - Cedric Kechavarzi
- Centre for Smart Infrastructure and Construction, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Adam Booth
- School of Earth and Environment, University of Leeds, Leeds, UK
| | - Tun Jan Young
- Scott Polar Research Institute, University of Cambridge, Cambridge, UK
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