Influence of glacier runoff and near-terminus subglacial hydrology on frontal ablation at a large Greenlandic tidewater glacier
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 spat...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/influence-of-glacier-runoff-and-nearterminus-subglacial-hydrology-on-frontal-ablation-at-a-large-greenlandic-tidewater-glacier(aad1fe0b-6047-4bc9-8266-eaf4cf3140da).html https://doi.org/10.1017/jog.2020.109 https://research-repository.st-andrews.ac.uk/bitstream/10023/21257/1/Bunce_2020_JG_Glacierrunoff_CC.pdf |
id |
ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/aad1fe0b-6047-4bc9-8266-eaf4cf3140da |
---|---|
record_format |
openpolar |
spelling |
ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/aad1fe0b-6047-4bc9-8266-eaf4cf3140da 2024-06-23T07:50:33+00:00 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 2020-12-29 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/influence-of-glacier-runoff-and-nearterminus-subglacial-hydrology-on-frontal-ablation-at-a-large-greenlandic-tidewater-glacier(aad1fe0b-6047-4bc9-8266-eaf4cf3140da).html https://doi.org/10.1017/jog.2020.109 https://research-repository.st-andrews.ac.uk/bitstream/10023/21257/1/Bunce_2020_JG_Glacierrunoff_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/influence-of-glacier-runoff-and-nearterminus-subglacial-hydrology-on-frontal-ablation-at-a-large-greenlandic-tidewater-glacier(aad1fe0b-6047-4bc9-8266-eaf4cf3140da).html info:eu-repo/semantics/openAccess 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 Arctic glaciology Ice/ocean interactions Iceberg calving article 2020 ftunstandrewcris https://doi.org/10.1017/jog.2020.109 2024-06-13T01:14:55Z 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. Article in Journal/Newspaper Arctic glacier Greenland greenlandic Ice Sheet Iceberg* Journal of Glaciology Tidewater University of St Andrews: Research Portal Arctic Greenland Journal of Glaciology 67 262 343 352 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Arctic glaciology Ice/ocean interactions Iceberg calving |
spellingShingle |
Arctic glaciology Ice/ocean interactions Iceberg calving 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 |
description |
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. |
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 |
2020 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/influence-of-glacier-runoff-and-nearterminus-subglacial-hydrology-on-frontal-ablation-at-a-large-greenlandic-tidewater-glacier(aad1fe0b-6047-4bc9-8266-eaf4cf3140da).html https://doi.org/10.1017/jog.2020.109 https://research-repository.st-andrews.ac.uk/bitstream/10023/21257/1/Bunce_2020_JG_Glacierrunoff_CC.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
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_source |
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 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/influence-of-glacier-runoff-and-nearterminus-subglacial-hydrology-on-frontal-ablation-at-a-large-greenlandic-tidewater-glacier(aad1fe0b-6047-4bc9-8266-eaf4cf3140da).html |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1802641462130638848 |