The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull
We present observations of the long-term recession of surging outlets of Icelandic ice caps in response to 20th century climate. In August 1998, synthetic aperture radar (SAR) data, covering the western part of Vatnajokull and the northern part of Myrdalsjokull in southern Iceland, were acquired wit...
Published in: | Earth and Planetary Science Letters |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2005
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Online Access: | https://orbit.dtu.dk/en/publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 https://doi.org/10.1016/j.epsl.2005.06.038 |
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ftdtupubl:oai:pure.atira.dk:publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 2024-09-15T18:07:50+00:00 The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull Magnússon, Eyjólfur Björnsson, Helgi Dall, Jørgen Pálsson, Finnur 2005 https://orbit.dtu.dk/en/publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 https://doi.org/10.1016/j.epsl.2005.06.038 eng eng https://orbit.dtu.dk/en/publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 info:eu-repo/semantics/closedAccess Magnússon , E , Björnsson , H , Dall , J & Pálsson , F 2005 , ' The 20th century retreat of ice caps in Iceland derived from airborne SAR : W-Vatnajökull and N-Myrdalsjökull ' , Earth and Planetary Science Letters , vol. 237 , no. 3-4 , pp. 508-515 . https://doi.org/10.1016/j.epsl.2005.06.038 Glacier changes SAR PolSAR Terminal moraines /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2005 ftdtupubl https://doi.org/10.1016/j.epsl.2005.06.038 2024-06-25T14:25:27Z We present observations of the long-term recession of surging outlets of Icelandic ice caps in response to 20th century climate. In August 1998, synthetic aperture radar (SAR) data, covering the western part of Vatnajokull and the northern part of Myrdalsjokull in southern Iceland, were acquired with the Danish airborne EMISAR radar system. Polarimetric and interferometric SAR data reveal the margins of the present ice caps as well as a series of terminal moraines in the fore field. These moraines date back to the maximum Neoglacial extent at the end of the 19th century and the outermost allow reconstruction of the margin at that time. The data offer a unique opportunity to estimate the area decrease of these ice caps in the 20th century. The influence of the fluctuations of the surge type outlets, constituting most of W-Vatnajokull area and a good part of N-Myrdalsjokull area, is minimal, since they had all recently surged in 1998 as was presumably the case when the outermost moraines were formed. The major contributor to the area decrease is therefore climate changes in the 20th century even though the glacier retreat has been interrupted by short-lived surges. Moraines associated with most of the surges in W-Vatnajokull in the 20th century are observed in the SAR data including the most recent surges in the 1990s. Interestingly no push moraines were observed in front of the surge advance, but the moraines appear when the glaciers start retreating. We estimate that the collective decrease of the outlets of western Vatnajokull since maximum Neoglacial extent of each outlet, is log km(2) (6.7%) corresponding to an average retreat of 850 in over a 130 km long margin. In the same period the outlet Slettjokull, in N-Myrdalsjokull, has decreased by 33 km(2) (20%) corresponding to an average retreat of 1500 in over a 20 kin long margin. (c) 2005 Elsevier B.V. All rights reserved. Article in Journal/Newspaper glacier Iceland Vatnajökull Technical University of Denmark: DTU Orbit Earth and Planetary Science Letters 237 3-4 508 515 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Glacier changes SAR PolSAR Terminal moraines /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
Glacier changes SAR PolSAR Terminal moraines /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Magnússon, Eyjólfur Björnsson, Helgi Dall, Jørgen Pálsson, Finnur The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
topic_facet |
Glacier changes SAR PolSAR Terminal moraines /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
description |
We present observations of the long-term recession of surging outlets of Icelandic ice caps in response to 20th century climate. In August 1998, synthetic aperture radar (SAR) data, covering the western part of Vatnajokull and the northern part of Myrdalsjokull in southern Iceland, were acquired with the Danish airborne EMISAR radar system. Polarimetric and interferometric SAR data reveal the margins of the present ice caps as well as a series of terminal moraines in the fore field. These moraines date back to the maximum Neoglacial extent at the end of the 19th century and the outermost allow reconstruction of the margin at that time. The data offer a unique opportunity to estimate the area decrease of these ice caps in the 20th century. The influence of the fluctuations of the surge type outlets, constituting most of W-Vatnajokull area and a good part of N-Myrdalsjokull area, is minimal, since they had all recently surged in 1998 as was presumably the case when the outermost moraines were formed. The major contributor to the area decrease is therefore climate changes in the 20th century even though the glacier retreat has been interrupted by short-lived surges. Moraines associated with most of the surges in W-Vatnajokull in the 20th century are observed in the SAR data including the most recent surges in the 1990s. Interestingly no push moraines were observed in front of the surge advance, but the moraines appear when the glaciers start retreating. We estimate that the collective decrease of the outlets of western Vatnajokull since maximum Neoglacial extent of each outlet, is log km(2) (6.7%) corresponding to an average retreat of 850 in over a 130 km long margin. In the same period the outlet Slettjokull, in N-Myrdalsjokull, has decreased by 33 km(2) (20%) corresponding to an average retreat of 1500 in over a 20 kin long margin. (c) 2005 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Magnússon, Eyjólfur Björnsson, Helgi Dall, Jørgen Pálsson, Finnur |
author_facet |
Magnússon, Eyjólfur Björnsson, Helgi Dall, Jørgen Pálsson, Finnur |
author_sort |
Magnússon, Eyjólfur |
title |
The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
title_short |
The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
title_full |
The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
title_fullStr |
The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
title_full_unstemmed |
The 20th century retreat of ice caps in Iceland derived from airborne SAR:W-Vatnajökull and N-Myrdalsjökull |
title_sort |
20th century retreat of ice caps in iceland derived from airborne sar:w-vatnajökull and n-myrdalsjökull |
publishDate |
2005 |
url |
https://orbit.dtu.dk/en/publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 https://doi.org/10.1016/j.epsl.2005.06.038 |
genre |
glacier Iceland Vatnajökull |
genre_facet |
glacier Iceland Vatnajökull |
op_source |
Magnússon , E , Björnsson , H , Dall , J & Pálsson , F 2005 , ' The 20th century retreat of ice caps in Iceland derived from airborne SAR : W-Vatnajökull and N-Myrdalsjökull ' , Earth and Planetary Science Letters , vol. 237 , no. 3-4 , pp. 508-515 . https://doi.org/10.1016/j.epsl.2005.06.038 |
op_relation |
https://orbit.dtu.dk/en/publications/a7758aa6-b719-4f27-96c7-301e2ad5db30 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2005.06.038 |
container_title |
Earth and Planetary Science Letters |
container_volume |
237 |
container_issue |
3-4 |
container_start_page |
508 |
op_container_end_page |
515 |
_version_ |
1810445191413235712 |