Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland
Retreat of calving glaciers worldwide has contributed substantially to sea-level rise in recent decades. Mass loss by calving contributes significantly to the uncertainty of sea-level rise projections. At Bowdoin Glacier, Northwest Greenland, most calving occurs by a few large events resulting from...
Published in: | Journal of Glaciology |
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2020
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/tides-modulate-crevasse-opening-prior-to-a-major-calving-event-at-bowdoin-glacier-northwest-greenland(ebbab811-079a-4d80-9227-ef9c92dfe96a).html https://doi.org/10.1017/jog.2019.89 https://research-repository.st-andrews.ac.uk/bitstream/10023/19382/1/vanDongen_2020_JG_Tides_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/ebbab811-079a-4d80-9227-ef9c92dfe96a 2024-09-15T18:07:40+00:00 Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland Van Dongen, Eef Jouvet, Guillaume Walter, Andrea Todd, Joe Zwinger, Thomas Asaji, Izumi Sugiyama, Shin Walter, Fabian Funk, Martin 2020-02 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/tides-modulate-crevasse-opening-prior-to-a-major-calving-event-at-bowdoin-glacier-northwest-greenland(ebbab811-079a-4d80-9227-ef9c92dfe96a).html https://doi.org/10.1017/jog.2019.89 https://research-repository.st-andrews.ac.uk/bitstream/10023/19382/1/vanDongen_2020_JG_Tides_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/tides-modulate-crevasse-opening-prior-to-a-major-calving-event-at-bowdoin-glacier-northwest-greenland(ebbab811-079a-4d80-9227-ef9c92dfe96a).html info:eu-repo/semantics/openAccess Van Dongen , E , Jouvet , G , Walter , A , Todd , J , Zwinger , T , Asaji , I , Sugiyama , S , Walter , F & Funk , M 2020 , ' Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland ' , Journal of Glaciology , vol. 66 , no. 255 , pp. 113-123 . https://doi.org/10.1017/jog.2019.89 Crevasses Glacier modelling Glacier monitoring Iceberg calving article 2020 ftunstandrewcris https://doi.org/10.1017/jog.2019.89 2024-08-14T23:40:02Z Retreat of calving glaciers worldwide has contributed substantially to sea-level rise in recent decades. Mass loss by calving contributes significantly to the uncertainty of sea-level rise projections. At Bowdoin Glacier, Northwest Greenland, most calving occurs by a few large events resulting from kilometre-scale fractures forming parallel to the calving front. High-resolution terrestrial radar interferometry data of such an event reveal that crevasse opening is fastest at low tide and accelerates during the final 36 h before calving. Using the ice flow model Elmer/Ice, we identify the crevasse water level as a key driver of modelled opening rates. Sea water-level variations in the range of local tidal amplitude (1 m) can reproduce observed opening rate fluctuations, provided crevasse water level is at least 4 m above the low-tide sea level. The accelerated opening rates within the final 36 h before calving can be modelled by additional meltwater input into the crevasse, enhanced ice cliff undercutting by submarine melt, ice damage increase due to tidal cyclic fatigue, crevasse deepening or a combination of these processes. Our results highlight the influence of surface meltwater and tides on crevasse opening leading to major calving events at grounded tidewater glaciers such as Bowdoin. Article in Journal/Newspaper glacier Greenland Journal of Glaciology Tidewater University of St Andrews: Research Portal Journal of Glaciology 66 255 113 123 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Crevasses Glacier modelling Glacier monitoring Iceberg calving |
spellingShingle |
Crevasses Glacier modelling Glacier monitoring Iceberg calving Van Dongen, Eef Jouvet, Guillaume Walter, Andrea Todd, Joe Zwinger, Thomas Asaji, Izumi Sugiyama, Shin Walter, Fabian Funk, Martin Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
topic_facet |
Crevasses Glacier modelling Glacier monitoring Iceberg calving |
description |
Retreat of calving glaciers worldwide has contributed substantially to sea-level rise in recent decades. Mass loss by calving contributes significantly to the uncertainty of sea-level rise projections. At Bowdoin Glacier, Northwest Greenland, most calving occurs by a few large events resulting from kilometre-scale fractures forming parallel to the calving front. High-resolution terrestrial radar interferometry data of such an event reveal that crevasse opening is fastest at low tide and accelerates during the final 36 h before calving. Using the ice flow model Elmer/Ice, we identify the crevasse water level as a key driver of modelled opening rates. Sea water-level variations in the range of local tidal amplitude (1 m) can reproduce observed opening rate fluctuations, provided crevasse water level is at least 4 m above the low-tide sea level. The accelerated opening rates within the final 36 h before calving can be modelled by additional meltwater input into the crevasse, enhanced ice cliff undercutting by submarine melt, ice damage increase due to tidal cyclic fatigue, crevasse deepening or a combination of these processes. Our results highlight the influence of surface meltwater and tides on crevasse opening leading to major calving events at grounded tidewater glaciers such as Bowdoin. |
format |
Article in Journal/Newspaper |
author |
Van Dongen, Eef Jouvet, Guillaume Walter, Andrea Todd, Joe Zwinger, Thomas Asaji, Izumi Sugiyama, Shin Walter, Fabian Funk, Martin |
author_facet |
Van Dongen, Eef Jouvet, Guillaume Walter, Andrea Todd, Joe Zwinger, Thomas Asaji, Izumi Sugiyama, Shin Walter, Fabian Funk, Martin |
author_sort |
Van Dongen, Eef |
title |
Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
title_short |
Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
title_full |
Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
title_fullStr |
Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
title_full_unstemmed |
Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland |
title_sort |
tides modulate crevasse opening prior to a major calving event at bowdoin glacier, northwest greenland |
publishDate |
2020 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/tides-modulate-crevasse-opening-prior-to-a-major-calving-event-at-bowdoin-glacier-northwest-greenland(ebbab811-079a-4d80-9227-ef9c92dfe96a).html https://doi.org/10.1017/jog.2019.89 https://research-repository.st-andrews.ac.uk/bitstream/10023/19382/1/vanDongen_2020_JG_Tides_CC.pdf |
genre |
glacier Greenland Journal of Glaciology Tidewater |
genre_facet |
glacier Greenland Journal of Glaciology Tidewater |
op_source |
Van Dongen , E , Jouvet , G , Walter , A , Todd , J , Zwinger , T , Asaji , I , Sugiyama , S , Walter , F & Funk , M 2020 , ' Tides modulate crevasse opening prior to a major calving event at Bowdoin Glacier, Northwest Greenland ' , Journal of Glaciology , vol. 66 , no. 255 , pp. 113-123 . https://doi.org/10.1017/jog.2019.89 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/tides-modulate-crevasse-opening-prior-to-a-major-calving-event-at-bowdoin-glacier-northwest-greenland(ebbab811-079a-4d80-9227-ef9c92dfe96a).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2019.89 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
255 |
container_start_page |
113 |
op_container_end_page |
123 |
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1810445046413000704 |