Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier
Charlie Bunce is supported by a NERC DTP studentship (NE/L002558/1). Ben Davison is funded by the Scottish Alliance for Geoscience, Environment and Society (SAGES) and University of St. Andrews. We acknowledge field and research grants from the RGS-IBG postgraduate research fund and Mackay/Weir Gree...
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Online Access: | http://hdl.handle.net/10023/21257 https://doi.org/10.1017/jog.2020.109 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/21257 2023-07-02T03:31:35+02:00 Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier Bunce, Charlie Nienow, Peter Sole, Andrew Cowton, Tom Davison, Ben University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute University of St Andrews. Environmental Change Research Group 2021-01-11T11:30:02Z 10 application/pdf http://hdl.handle.net/10023/21257 https://doi.org/10.1017/jog.2020.109 eng eng Journal of Glaciology Bunce , C , Nienow , P , Sole , A , Cowton , T & Davison , B 2020 , ' Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier ' , Journal of Glaciology , vol. First View . https://doi.org/10.1017/jog.2020.109 0022-1430 PURE: 272129467 PURE UUID: aad1fe0b-6047-4bc9-8266-eaf4cf3140da ORCID: /0000-0001-9483-2956/work/86538342 ORCID: /0000-0003-1668-7372/work/86538442 Scopus: 85098696217 WOS: 000629692500012 http://hdl.handle.net/10023/21257 https://doi.org/10.1017/jog.2020.109 Copyright © The Author(s), 2020. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Arctic glaciology Ice/ocean interactions Iceberg calving G Geography (General) NDAS SDG 14 - Life Below Water G1 Journal article 2021 ftstandrewserep https://doi.org/10.1017/jog.2020.109 2023-06-13T18:28:27Z Charlie Bunce is supported by a NERC DTP studentship (NE/L002558/1). Ben Davison is funded by the Scottish Alliance for Geoscience, Environment and Society (SAGES) and University of St. Andrews. We acknowledge field and research grants from the RGS-IBG postgraduate research fund and Mackay/Weir Greenland Fund (University of Edinburgh) awarded to Charlie Bunce and RGS-IBG postgraduate research fund, Mackay/Weir Greenland Fund (University of Edinburgh) and Centenary Funding (University of Edinburgh) awarded to Alexis Moyer (University of Edinburgh). Frontal ablation from tidewater glaciers is a major component of the total mass loss from the Greenland ice sheet. It remains unclear, however, how changes in atmospheric and oceanic temperatures translate into changes in frontal ablation, in part due to sparse observations at sufficiently high spatial and temporal resolution. We present high-frequency time-lapse imagery (photos every 30 min) of iceberg calving and meltwater plumes at Kangiata Nunaata Sermia (KNS), southwest Greenland, during June–October 2017, alongside satellite-derived ice velocities and modelled subglacial discharge. Early in the melt season, we infer a subglacial hydrological network with multiple outlets that would theoretically distribute discharge and enhance undercutting by submarine melt, an inference supported by our observations of terminus-wide calving during this period. During the melt season, we infer hydraulic evolution to a relatively more channelised subglacial drainage configuration, based on meltwater plume visibility indicating focused emergence of subglacial water; these observations coincide with a reduction in terminus-wide calving and transition to an incised planform terminus geometry. We suggest that temporal variations in subglacial discharge and near-terminus subglacial hydraulic efficiency exert considerable influence on calving and frontal ablation at KNS. Publisher PDF Peer reviewed Article in Journal/Newspaper Arctic glacier Greenland greenlandic Ice Sheet Iceberg* Journal of Glaciology Tidewater University of St Andrews: Digital Research Repository Arctic Greenland Mackay ENVELOPE(168.517,168.517,-77.700,-77.700) Weir ENVELOPE(177.167,177.167,-84.983,-84.983) Journal of Glaciology 67 262 343 352 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Arctic glaciology Ice/ocean interactions Iceberg calving G Geography (General) NDAS SDG 14 - Life Below Water G1 |
spellingShingle |
Arctic glaciology Ice/ocean interactions Iceberg calving G Geography (General) NDAS SDG 14 - Life Below Water G1 Bunce, Charlie Nienow, Peter Sole, Andrew Cowton, Tom Davison, Ben Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
topic_facet |
Arctic glaciology Ice/ocean interactions Iceberg calving G Geography (General) NDAS SDG 14 - Life Below Water G1 |
description |
Charlie Bunce is supported by a NERC DTP studentship (NE/L002558/1). Ben Davison is funded by the Scottish Alliance for Geoscience, Environment and Society (SAGES) and University of St. Andrews. We acknowledge field and research grants from the RGS-IBG postgraduate research fund and Mackay/Weir Greenland Fund (University of Edinburgh) awarded to Charlie Bunce and RGS-IBG postgraduate research fund, Mackay/Weir Greenland Fund (University of Edinburgh) and Centenary Funding (University of Edinburgh) awarded to Alexis Moyer (University of Edinburgh). Frontal ablation from tidewater glaciers is a major component of the total mass loss from the Greenland ice sheet. It remains unclear, however, how changes in atmospheric and oceanic temperatures translate into changes in frontal ablation, in part due to sparse observations at sufficiently high spatial and temporal resolution. We present high-frequency time-lapse imagery (photos every 30 min) of iceberg calving and meltwater plumes at Kangiata Nunaata Sermia (KNS), southwest Greenland, during June–October 2017, alongside satellite-derived ice velocities and modelled subglacial discharge. Early in the melt season, we infer a subglacial hydrological network with multiple outlets that would theoretically distribute discharge and enhance undercutting by submarine melt, an inference supported by our observations of terminus-wide calving during this period. During the melt season, we infer hydraulic evolution to a relatively more channelised subglacial drainage configuration, based on meltwater plume visibility indicating focused emergence of subglacial water; these observations coincide with a reduction in terminus-wide calving and transition to an incised planform terminus geometry. We suggest that temporal variations in subglacial discharge and near-terminus subglacial hydraulic efficiency exert considerable influence on calving and frontal ablation at KNS. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute University of St Andrews. Environmental Change Research Group |
format |
Article in Journal/Newspaper |
author |
Bunce, Charlie Nienow, Peter Sole, Andrew Cowton, Tom Davison, Ben |
author_facet |
Bunce, Charlie Nienow, Peter Sole, Andrew Cowton, Tom Davison, Ben |
author_sort |
Bunce, Charlie |
title |
Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
title_short |
Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
title_full |
Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
title_fullStr |
Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
title_full_unstemmed |
Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier |
title_sort |
influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large greenlandic tidewater glacier |
publishDate |
2021 |
url |
http://hdl.handle.net/10023/21257 https://doi.org/10.1017/jog.2020.109 |
long_lat |
ENVELOPE(168.517,168.517,-77.700,-77.700) ENVELOPE(177.167,177.167,-84.983,-84.983) |
geographic |
Arctic Greenland Mackay Weir |
geographic_facet |
Arctic Greenland Mackay Weir |
genre |
Arctic glacier Greenland greenlandic Ice Sheet Iceberg* Journal of Glaciology Tidewater |
genre_facet |
Arctic glacier Greenland greenlandic Ice Sheet Iceberg* Journal of Glaciology Tidewater |
op_relation |
Journal of Glaciology Bunce , C , Nienow , P , Sole , A , Cowton , T & Davison , B 2020 , ' Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier ' , Journal of Glaciology , vol. First View . https://doi.org/10.1017/jog.2020.109 0022-1430 PURE: 272129467 PURE UUID: aad1fe0b-6047-4bc9-8266-eaf4cf3140da ORCID: /0000-0001-9483-2956/work/86538342 ORCID: /0000-0003-1668-7372/work/86538442 Scopus: 85098696217 WOS: 000629692500012 http://hdl.handle.net/10023/21257 https://doi.org/10.1017/jog.2020.109 |
op_rights |
Copyright © The Author(s), 2020. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1017/jog.2020.109 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
262 |
container_start_page |
343 |
op_container_end_page |
352 |
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1770270942867488768 |