Print Email Facebook Twitter Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing Title Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing Author Law, Robert (Scott Polar Research Institute) Christoffersen, Poul (Scott Polar Research Institute) Hubbard, Bryn (Aberystwyth University) Doyle, Samuel H. (Aberystwyth University) Chudley, Thomas R. (Scott Polar Research Institute) Schoonman, Charlotte M. (Scott Polar Research Institute) Bougamont, Marion (Scott Polar Research Institute) des Tombe, B.F. (TU Delft Water Resources) Schilperoort, B. (TU Delft Geoscience and Remote Sensing) Kechavarzi, Cedric (University of Cambridge) Booth, Adam (University of Leeds) Young, Tun Jan (Scott Polar Research Institute) Department Geoscience and Remote Sensing Date 2021 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. To reference this document use: http://resolver.tudelft.nl/uuid:0505980b-ec35-4fff-977a-2bb8cb694677 DOI https://doi.org/10.1126/sciadv.abe7136 ISSN 2375-2548 Source Science Advances, 7 (20), 1-11 Part of collection Institutional Repository Document type journal article Rights © 2021 Robert Law, Poul Christoffersen, Bryn Hubbard, Samuel H. Doyle, Thomas R. Chudley, Charlotte M. Schoonman, Marion Bougamont, B.F. des Tombe, B. Schilperoort, Cedric Kechavarzi, Adam Booth, Tun Jan Young Files PDF eabe7136.full.pdf 1.35 MB Close viewer /islandora/object/uuid:0505980b-ec35-4fff-977a-2bb8cb694677/datastream/OBJ/view