Thinning leads to calving-style changes at Bowdoin Glacier, Greenland
Ice mass loss from the Greenland ice sheet is the largest single contributor to sea level rise in the 21st century. The mass loss rate has accelerated in recent decades mainly due to thinning and retreat of its outlet glaciers. The diverse calving mechanisms responsible for tidewater glacier retreat...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-15-485-2021 https://noa.gwlb.de/receive/cop_mods_00055467 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055118/tc-15-485-2021.pdf https://tc.copernicus.org/articles/15/485/2021/tc-15-485-2021.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055467 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055467 2023-05-15T16:21:10+02:00 Thinning leads to calving-style changes at Bowdoin Glacier, Greenland van Dongen, Eef C. H. Jouvet, Guillaume Sugiyama, Shin Podolskiy, Evgeny A. Funk, Martin Benn, Douglas I. Lindner, Fabian Bauder, Andreas Seguinot, Julien Leinss, Silvan Walter, Fabian 2021-02 electronic https://doi.org/10.5194/tc-15-485-2021 https://noa.gwlb.de/receive/cop_mods_00055467 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055118/tc-15-485-2021.pdf https://tc.copernicus.org/articles/15/485/2021/tc-15-485-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-485-2021 https://noa.gwlb.de/receive/cop_mods_00055467 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055118/tc-15-485-2021.pdf https://tc.copernicus.org/articles/15/485/2021/tc-15-485-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-485-2021 2022-02-08T22:34:32Z Ice mass loss from the Greenland ice sheet is the largest single contributor to sea level rise in the 21st century. The mass loss rate has accelerated in recent decades mainly due to thinning and retreat of its outlet glaciers. The diverse calving mechanisms responsible for tidewater glacier retreat are not fully understood yet. Since a tidewater glacier’s sensitivity to external forcings depends on its calving style, detailed insight into calving processes is necessary to improve projections of ice sheet mass loss by calving. As tidewater glaciers are mostly thinning, their calving styles are expected to change. Here, we study calving behaviour changes under a thinning regime at Bowdoin Glacier, north-western Greenland, by combining field and remote-sensing data from 2015 to 2019. Previous studies showed that major calving events in 2015 and 2017 were driven by hydro-fracturing and melt-undercutting. New observations from uncrewed aerial vehicle (UAV) imagery and a GPS network installed at the calving front in 2019 suggest ungrounding and buoyant calving have recently occurred as they show (1) increasing tidal modulation of vertical motion compared to previous years, (2) absence of a surface crevasse prior to calving, and (3) uplift and horizontal surface compression prior to calving. Furthermore, an inventory of calving events from 2015 to 2019 based on satellite imagery provides additional support for a change towards buoyant calving since it shows an increasing occurrence of calving events outside of the melt season. The observed change in calving style could lead to a possible retreat of the terminus, which has been stable since 2013. We therefore highlight the need for high-resolution monitoring to detect changing calving styles and numerical models that cover the full spectrum of calving mechanisms to improve projections of ice sheet mass loss by calving. Article in Journal/Newspaper glacier Greenland Ice Sheet The Cryosphere Tidewater Niedersächsisches Online-Archiv NOA Bowdoin ENVELOPE(-69.317,-69.317,77.683,77.683) Greenland The Cryosphere 15 2 485 500 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung van Dongen, Eef C. H. Jouvet, Guillaume Sugiyama, Shin Podolskiy, Evgeny A. Funk, Martin Benn, Douglas I. Lindner, Fabian Bauder, Andreas Seguinot, Julien Leinss, Silvan Walter, Fabian Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
topic_facet |
article Verlagsveröffentlichung |
description |
Ice mass loss from the Greenland ice sheet is the largest single contributor to sea level rise in the 21st century. The mass loss rate has accelerated in recent decades mainly due to thinning and retreat of its outlet glaciers. The diverse calving mechanisms responsible for tidewater glacier retreat are not fully understood yet. Since a tidewater glacier’s sensitivity to external forcings depends on its calving style, detailed insight into calving processes is necessary to improve projections of ice sheet mass loss by calving. As tidewater glaciers are mostly thinning, their calving styles are expected to change. Here, we study calving behaviour changes under a thinning regime at Bowdoin Glacier, north-western Greenland, by combining field and remote-sensing data from 2015 to 2019. Previous studies showed that major calving events in 2015 and 2017 were driven by hydro-fracturing and melt-undercutting. New observations from uncrewed aerial vehicle (UAV) imagery and a GPS network installed at the calving front in 2019 suggest ungrounding and buoyant calving have recently occurred as they show (1) increasing tidal modulation of vertical motion compared to previous years, (2) absence of a surface crevasse prior to calving, and (3) uplift and horizontal surface compression prior to calving. Furthermore, an inventory of calving events from 2015 to 2019 based on satellite imagery provides additional support for a change towards buoyant calving since it shows an increasing occurrence of calving events outside of the melt season. The observed change in calving style could lead to a possible retreat of the terminus, which has been stable since 2013. We therefore highlight the need for high-resolution monitoring to detect changing calving styles and numerical models that cover the full spectrum of calving mechanisms to improve projections of ice sheet mass loss by calving. |
format |
Article in Journal/Newspaper |
author |
van Dongen, Eef C. H. Jouvet, Guillaume Sugiyama, Shin Podolskiy, Evgeny A. Funk, Martin Benn, Douglas I. Lindner, Fabian Bauder, Andreas Seguinot, Julien Leinss, Silvan Walter, Fabian |
author_facet |
van Dongen, Eef C. H. Jouvet, Guillaume Sugiyama, Shin Podolskiy, Evgeny A. Funk, Martin Benn, Douglas I. Lindner, Fabian Bauder, Andreas Seguinot, Julien Leinss, Silvan Walter, Fabian |
author_sort |
van Dongen, Eef C. H. |
title |
Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
title_short |
Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
title_full |
Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
title_fullStr |
Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
title_full_unstemmed |
Thinning leads to calving-style changes at Bowdoin Glacier, Greenland |
title_sort |
thinning leads to calving-style changes at bowdoin glacier, greenland |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-485-2021 https://noa.gwlb.de/receive/cop_mods_00055467 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055118/tc-15-485-2021.pdf https://tc.copernicus.org/articles/15/485/2021/tc-15-485-2021.pdf |
long_lat |
ENVELOPE(-69.317,-69.317,77.683,77.683) |
geographic |
Bowdoin Greenland |
geographic_facet |
Bowdoin Greenland |
genre |
glacier Greenland Ice Sheet The Cryosphere Tidewater |
genre_facet |
glacier Greenland Ice Sheet The Cryosphere Tidewater |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-485-2021 https://noa.gwlb.de/receive/cop_mods_00055467 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055118/tc-15-485-2021.pdf https://tc.copernicus.org/articles/15/485/2021/tc-15-485-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-15-485-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
2 |
container_start_page |
485 |
op_container_end_page |
500 |
_version_ |
1766009178862649344 |