Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory
Funding for DIB and AL was provided by NE/R018243/1 REBUS (Resolving Enthalpy Budget to Understand Surging), and JJF received funding from the German Research Foundation (DFG) under grant number FU1032/1-1. Analysis of a recent surge of Morsnevbreen, Svalbard, is used to test predictions of the enth...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/18537 2023-07-02T03:31:31+02:00 Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory Benn, Douglas I. Jones, Robert L. Luckman, Adrian Fürst, Johannes J. Hewitt, Ian Sommer, Christian NERC University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute 2019-09-23T09:30:07Z 15 application/pdf http://hdl.handle.net/10023/18537 https://doi.org/10.1017/jog.2019.63 eng eng Journal of Glaciology Benn , D I , Jones , R L , Luckman , A , Fürst , J J , Hewitt , I & Sommer , C 2019 , ' Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory ' , Journal of Glaciology , vol. 65 , no. 253 , pp. 717-731 . https://doi.org/10.1017/jog.2019.63 0022-1430 PURE: 261315084 PURE UUID: ecff9aa9-ec8e-4dd5-b9e4-93da559c1b34 Scopus: 85071948480 ORCID: /0000-0002-3604-0886/work/64697405 WOS: 000487667400002 http://hdl.handle.net/10023/18537 https://doi.org/10.1017/jog.2019.63 NE/R018243/1 Copyright : © The Author(s) 2019. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work. Arctic glaciology Glacier surges Ice dynamics G Geography (General) Earth-Surface Processes 3rd-DAS G1 Journal article 2019 ftstandrewserep https://doi.org/10.1017/jog.2019.63 2023-06-13T18:28:04Z Funding for DIB and AL was provided by NE/R018243/1 REBUS (Resolving Enthalpy Budget to Understand Surging), and JJF received funding from the German Research Foundation (DFG) under grant number FU1032/1-1. Analysis of a recent surge of Morsnevbreen, Svalbard, is used to test predictions of the enthalpy balance theory of surging. High-resolution time series of velocities, ice thickness and crevasse distribution allow key elements of the enthalpy (internal energy) budget to be quantified for different stages of the surge cycle. During quiescence (1936-1990), velocities were very low, and geothermal heat slowly built-up enthalpy at the bed. Measurable mass transfer and frictional heating began in 1990-2010, then positive frictional heating-velocity feedbacks caused gradual acceleration from 2010 to 2015. Rapid acceleration occurred in summer 2016, when extensive crevassing and positive air temperatures allowed significant surface to bed drainage. The surge front reached the terminus in October 2016, coincident with a drop in velocities. Ice plumes in the fjord are interpreted as discharge of large volumes of supercooled water from the bed. Surge termination was prolonged, however, indicating persistence of an inefficient drainage system. The observations closely match predictions of the theory, particularly build-up of enthalpy from geothermal and frictional heat, and surface meltwater, and the concomitant changes in ice-surface elevation and velocity. Additional characteristics of the surge reflect spatial processes not represented in the model, but can be explained with respect to enthalpy gradients. Publisher PDF Peer reviewed Article in Journal/Newspaper Arctic glacier Journal of Glaciology Svalbard University of St Andrews: Digital Research Repository Arctic Svalbard Journal of Glaciology 65 253 717 731 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Arctic glaciology Glacier surges Ice dynamics G Geography (General) Earth-Surface Processes 3rd-DAS G1 |
spellingShingle |
Arctic glaciology Glacier surges Ice dynamics G Geography (General) Earth-Surface Processes 3rd-DAS G1 Benn, Douglas I. Jones, Robert L. Luckman, Adrian Fürst, Johannes J. Hewitt, Ian Sommer, Christian Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
topic_facet |
Arctic glaciology Glacier surges Ice dynamics G Geography (General) Earth-Surface Processes 3rd-DAS G1 |
description |
Funding for DIB and AL was provided by NE/R018243/1 REBUS (Resolving Enthalpy Budget to Understand Surging), and JJF received funding from the German Research Foundation (DFG) under grant number FU1032/1-1. Analysis of a recent surge of Morsnevbreen, Svalbard, is used to test predictions of the enthalpy balance theory of surging. High-resolution time series of velocities, ice thickness and crevasse distribution allow key elements of the enthalpy (internal energy) budget to be quantified for different stages of the surge cycle. During quiescence (1936-1990), velocities were very low, and geothermal heat slowly built-up enthalpy at the bed. Measurable mass transfer and frictional heating began in 1990-2010, then positive frictional heating-velocity feedbacks caused gradual acceleration from 2010 to 2015. Rapid acceleration occurred in summer 2016, when extensive crevassing and positive air temperatures allowed significant surface to bed drainage. The surge front reached the terminus in October 2016, coincident with a drop in velocities. Ice plumes in the fjord are interpreted as discharge of large volumes of supercooled water from the bed. Surge termination was prolonged, however, indicating persistence of an inefficient drainage system. The observations closely match predictions of the theory, particularly build-up of enthalpy from geothermal and frictional heat, and surface meltwater, and the concomitant changes in ice-surface elevation and velocity. Additional characteristics of the surge reflect spatial processes not represented in the model, but can be explained with respect to enthalpy gradients. Publisher PDF Peer reviewed |
author2 |
NERC University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Benn, Douglas I. Jones, Robert L. Luckman, Adrian Fürst, Johannes J. Hewitt, Ian Sommer, Christian |
author_facet |
Benn, Douglas I. Jones, Robert L. Luckman, Adrian Fürst, Johannes J. Hewitt, Ian Sommer, Christian |
author_sort |
Benn, Douglas I. |
title |
Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
title_short |
Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
title_full |
Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
title_fullStr |
Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
title_full_unstemmed |
Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
title_sort |
mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory |
publishDate |
2019 |
url |
http://hdl.handle.net/10023/18537 https://doi.org/10.1017/jog.2019.63 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic glacier Journal of Glaciology Svalbard |
genre_facet |
Arctic glacier Journal of Glaciology Svalbard |
op_relation |
Journal of Glaciology Benn , D I , Jones , R L , Luckman , A , Fürst , J J , Hewitt , I & Sommer , C 2019 , ' Mass and enthalpy budget evolution during the surge of a polythermal glacier : a test of theory ' , Journal of Glaciology , vol. 65 , no. 253 , pp. 717-731 . https://doi.org/10.1017/jog.2019.63 0022-1430 PURE: 261315084 PURE UUID: ecff9aa9-ec8e-4dd5-b9e4-93da559c1b34 Scopus: 85071948480 ORCID: /0000-0002-3604-0886/work/64697405 WOS: 000487667400002 http://hdl.handle.net/10023/18537 https://doi.org/10.1017/jog.2019.63 NE/R018243/1 |
op_rights |
Copyright : © The Author(s) 2019. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work. |
op_doi |
https://doi.org/10.1017/jog.2019.63 |
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Journal of Glaciology |
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65 |
container_issue |
253 |
container_start_page |
717 |
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731 |
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