A century of geometry and velocity evolution at Eqip Sermia, West Greenland
International audience Rapid dynamic changes of ocean-terminating outlet glaciers of the Greenland ice sheet are related to atmospheric and oceanic warming but the detailed link to external forcing is not well understood. Observations show high variability in dynamic changes and are mainly limited t...
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ftunivnantes:oai:HAL:hal-02009223v1 2023-05-15T16:21:01+02:00 A century of geometry and velocity evolution at Eqip Sermia, West Greenland Lüthi, Martin Vieli, Andreas Moreau, Luc Joughin, Ian Reisser, Moritz Small, David Stober, Manfred Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2016-08 https://hal.archives-ouvertes.fr/hal-02009223 en eng HAL CCSD International Glaciological Society hal-02009223 https://hal.archives-ouvertes.fr/hal-02009223 ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.archives-ouvertes.fr/hal-02009223 Journal of Glaciology, International Glaciological Society, 2016, 62 (234), pp.640-654 glacier calving glacier fluctuations ice and climate ice-sheet reconstruction ice/ocean interactions [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.IE]Environmental Sciences/Environmental Engineering [SDE.ES]Environmental Sciences/Environmental and Society [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/article Journal articles 2016 ftunivnantes 2022-11-02T01:33:01Z International audience Rapid dynamic changes of ocean-terminating outlet glaciers of the Greenland ice sheet are related to atmospheric and oceanic warming but the detailed link to external forcing is not well understood. Observations show high variability in dynamic changes and are mainly limited to the past three decades with dense satellite observations. Here we compile a long-term record of dynamic changes of Eqip Sermia Glacier, West Greenland. Starting in 1912, we combine historical measurements of terminus positions, ice-surface elevation and flow velocity together with more recent in-situ and remote-sensing observations. In the 20th century, the glacier underwent small variations in terminus position and flow speed. Between 2000 and 2003, the terminus retreated substantially, but stabilized thereafter. In 2009, the northern terminus lobe started to retreat very rapidly; the southern lobe collapsed in 2013. The present terminus position, which has retreated by 4 km since 1920, is unprecedented in the historical record. Flow velocities were relatively stable until 2010. The recent acceleration reached threefold velocities in 2014 and rapidly affected the whole terminus region up to 15 km inland. Comparison with forcings from the atmosphere and the ocean over the past century shows that no dominant cause can be identified, and that local effects of bed geometry modulate the glacier response. Article in Journal/Newspaper glacier Greenland Ice Sheet Journal of Glaciology Université de Nantes: HAL-UNIV-NANTES Eqip Sermia ENVELOPE(-50.067,-50.067,69.817,69.817) Greenland |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
glacier calving glacier fluctuations ice and climate ice-sheet reconstruction ice/ocean interactions [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.IE]Environmental Sciences/Environmental Engineering [SDE.ES]Environmental Sciences/Environmental and Society [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
glacier calving glacier fluctuations ice and climate ice-sheet reconstruction ice/ocean interactions [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.IE]Environmental Sciences/Environmental Engineering [SDE.ES]Environmental Sciences/Environmental and Society [SHS.GEO]Humanities and Social Sciences/Geography Lüthi, Martin Vieli, Andreas Moreau, Luc Joughin, Ian Reisser, Moritz Small, David Stober, Manfred A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
topic_facet |
glacier calving glacier fluctuations ice and climate ice-sheet reconstruction ice/ocean interactions [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.IE]Environmental Sciences/Environmental Engineering [SDE.ES]Environmental Sciences/Environmental and Society [SHS.GEO]Humanities and Social Sciences/Geography |
description |
International audience Rapid dynamic changes of ocean-terminating outlet glaciers of the Greenland ice sheet are related to atmospheric and oceanic warming but the detailed link to external forcing is not well understood. Observations show high variability in dynamic changes and are mainly limited to the past three decades with dense satellite observations. Here we compile a long-term record of dynamic changes of Eqip Sermia Glacier, West Greenland. Starting in 1912, we combine historical measurements of terminus positions, ice-surface elevation and flow velocity together with more recent in-situ and remote-sensing observations. In the 20th century, the glacier underwent small variations in terminus position and flow speed. Between 2000 and 2003, the terminus retreated substantially, but stabilized thereafter. In 2009, the northern terminus lobe started to retreat very rapidly; the southern lobe collapsed in 2013. The present terminus position, which has retreated by 4 km since 1920, is unprecedented in the historical record. Flow velocities were relatively stable until 2010. The recent acceleration reached threefold velocities in 2014 and rapidly affected the whole terminus region up to 15 km inland. Comparison with forcings from the atmosphere and the ocean over the past century shows that no dominant cause can be identified, and that local effects of bed geometry modulate the glacier response. |
author2 |
Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lüthi, Martin Vieli, Andreas Moreau, Luc Joughin, Ian Reisser, Moritz Small, David Stober, Manfred |
author_facet |
Lüthi, Martin Vieli, Andreas Moreau, Luc Joughin, Ian Reisser, Moritz Small, David Stober, Manfred |
author_sort |
Lüthi, Martin |
title |
A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
title_short |
A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
title_full |
A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
title_fullStr |
A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
title_full_unstemmed |
A century of geometry and velocity evolution at Eqip Sermia, West Greenland |
title_sort |
century of geometry and velocity evolution at eqip sermia, west greenland |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-02009223 |
long_lat |
ENVELOPE(-50.067,-50.067,69.817,69.817) |
geographic |
Eqip Sermia Greenland |
geographic_facet |
Eqip Sermia Greenland |
genre |
glacier Greenland Ice Sheet Journal of Glaciology |
genre_facet |
glacier Greenland Ice Sheet Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.archives-ouvertes.fr/hal-02009223 Journal of Glaciology, International Glaciological Society, 2016, 62 (234), pp.640-654 |
op_relation |
hal-02009223 https://hal.archives-ouvertes.fr/hal-02009223 |
_version_ |
1766009022179180544 |