Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes
Since the 2000s, Greenland ice sheet mass loss has been accelerating, followed by increasing numbers of glacial earthquakes (GEs) at near-grounded glaciers. GEs are caused by calving of km-scale icebergs which capsize against the terminus. Seismic record inversion allows a reconstruction of the hist...
Published in: | Annals of Glaciology |
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Language: | English |
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Cambridge University Press
2019
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Online Access: | https://doi.org/10.1017/aog.2019.7 https://doaj.org/article/4a625f663710439fbb3a9177e1fce77e |
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ftdoajarticles:oai:doaj.org/article:4a625f663710439fbb3a9177e1fce77e 2023-05-15T13:29:36+02:00 Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes Amandine Sergeant Anne Mangeney Vladislav A. Yastrebov Fabian Walter Jean-Paul Montagner Olivier Castelnau Eléonore Stutzmann Pauline Bonnet Velotioana Jean-Luc Ralaiarisoa Suzanne Bevan Adrian Luckman 2019-09-01T00:00:00Z https://doi.org/10.1017/aog.2019.7 https://doaj.org/article/4a625f663710439fbb3a9177e1fce77e EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305519000077/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.7 0260-3055 1727-5644 https://doaj.org/article/4a625f663710439fbb3a9177e1fce77e Annals of Glaciology, Vol 60, Pp 75-95 (2019) climate change glacier calving glacier discharge iceberg calving seismology Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/aog.2019.7 2023-03-12T01:31:55Z Since the 2000s, Greenland ice sheet mass loss has been accelerating, followed by increasing numbers of glacial earthquakes (GEs) at near-grounded glaciers. GEs are caused by calving of km-scale icebergs which capsize against the terminus. Seismic record inversion allows a reconstruction of the history of GE sources which captures capsize dynamics through iceberg-to-terminus contact. When compared with a catalog of contact forces from an iceberg capsize model, seismic force history accurately computes calving volumes while the earthquake magnitude fails to uniquely characterize iceberg size, giving errors up to 1 km3. Calving determined from GEs recorded ateight glaciers in 1993–2013 accounts for up to 21% of the associated discharge and 6% of the Greenland mass loss. The proportion of discharge attributed to capsizing calving may be underestimated by at least 10% as numerous events could not be identified by standard seismic detections (Olsen and Nettles, 2018). While calving production tends to stabilize in East Greenland, Western glaciers have released more and larger icebergs since 2010 and have become major contributors to Greenland dynamic discharge. Production of GEs and calving behavior are controlled by glacier geometry with bigger icebergs being produced when the terminus advances in deepening water. We illustrate how GEs can help in partitioning and monitoring Greenland mass loss and characterizing capsize dynamics. Article in Journal/Newspaper Annals of Glaciology East Greenland glacier Greenland Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Annals of Glaciology 60 79 75 95 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
climate change glacier calving glacier discharge iceberg calving seismology Meteorology. Climatology QC851-999 |
spellingShingle |
climate change glacier calving glacier discharge iceberg calving seismology Meteorology. Climatology QC851-999 Amandine Sergeant Anne Mangeney Vladislav A. Yastrebov Fabian Walter Jean-Paul Montagner Olivier Castelnau Eléonore Stutzmann Pauline Bonnet Velotioana Jean-Luc Ralaiarisoa Suzanne Bevan Adrian Luckman Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
topic_facet |
climate change glacier calving glacier discharge iceberg calving seismology Meteorology. Climatology QC851-999 |
description |
Since the 2000s, Greenland ice sheet mass loss has been accelerating, followed by increasing numbers of glacial earthquakes (GEs) at near-grounded glaciers. GEs are caused by calving of km-scale icebergs which capsize against the terminus. Seismic record inversion allows a reconstruction of the history of GE sources which captures capsize dynamics through iceberg-to-terminus contact. When compared with a catalog of contact forces from an iceberg capsize model, seismic force history accurately computes calving volumes while the earthquake magnitude fails to uniquely characterize iceberg size, giving errors up to 1 km3. Calving determined from GEs recorded ateight glaciers in 1993–2013 accounts for up to 21% of the associated discharge and 6% of the Greenland mass loss. The proportion of discharge attributed to capsizing calving may be underestimated by at least 10% as numerous events could not be identified by standard seismic detections (Olsen and Nettles, 2018). While calving production tends to stabilize in East Greenland, Western glaciers have released more and larger icebergs since 2010 and have become major contributors to Greenland dynamic discharge. Production of GEs and calving behavior are controlled by glacier geometry with bigger icebergs being produced when the terminus advances in deepening water. We illustrate how GEs can help in partitioning and monitoring Greenland mass loss and characterizing capsize dynamics. |
format |
Article in Journal/Newspaper |
author |
Amandine Sergeant Anne Mangeney Vladislav A. Yastrebov Fabian Walter Jean-Paul Montagner Olivier Castelnau Eléonore Stutzmann Pauline Bonnet Velotioana Jean-Luc Ralaiarisoa Suzanne Bevan Adrian Luckman |
author_facet |
Amandine Sergeant Anne Mangeney Vladislav A. Yastrebov Fabian Walter Jean-Paul Montagner Olivier Castelnau Eléonore Stutzmann Pauline Bonnet Velotioana Jean-Luc Ralaiarisoa Suzanne Bevan Adrian Luckman |
author_sort |
Amandine Sergeant |
title |
Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
title_short |
Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
title_full |
Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
title_fullStr |
Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
title_full_unstemmed |
Monitoring Greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
title_sort |
monitoring greenland ice sheet buoyancy-driven calving discharge using glacial earthquakes |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/aog.2019.7 https://doaj.org/article/4a625f663710439fbb3a9177e1fce77e |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology East Greenland glacier Greenland Ice Sheet |
genre_facet |
Annals of Glaciology East Greenland glacier Greenland Ice Sheet |
op_source |
Annals of Glaciology, Vol 60, Pp 75-95 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305519000077/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.7 0260-3055 1727-5644 https://doaj.org/article/4a625f663710439fbb3a9177e1fce77e |
op_doi |
https://doi.org/10.1017/aog.2019.7 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
75 |
op_container_end_page |
95 |
_version_ |
1766001421795196928 |