Surface velocity and ice discharge of the ice cap on King George Island, Antarctica
Glaciers on King George Island, Antarctica, have shown retreat and surface lowering in recent decades, concurrent with increasing air temperatures. A large portion of the glacier perimeter is ocean-terminating, suggesting possible large mass losses due to calving and submarine melting. Here we estim...
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ftunivpmadrid:oai:oa.upm.es:29196 2023-06-11T04:03:53+02:00 Surface velocity and ice discharge of the ice cap on King George Island, Antarctica Osmanoğlu, B. Braun, M. Hock, R. Navarro Valero, Francisco José 2013-07 application/pdf https://oa.upm.es/29196/ eng eng E.T.S.I. Telecomunicación (UPM) http://www.ingentaconnect.com/content/igsoc/agl/2013/00000054/00000063/art00013?token=00521c426f8ed0c3ae807e2a46762c6b795d36666725532e6e2f2a673f7b2f267738703375686f49b8 info:eu-repo/semantics/altIdentifier/doi/10.3189/2013AoG63A517 https://oa.upm.es/29196/ https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Annals of Glaciology, ISSN 0260-3055, 2013-07, Vol. 54, No. 63 Telecomunicaciones Geología info:eu-repo/semantics/article Artículo PeerReviewed 2013 ftunivpmadrid https://doi.org/10.3189/2013AoG63A517 2023-04-18T23:15:39Z Glaciers on King George Island, Antarctica, have shown retreat and surface lowering in recent decades, concurrent with increasing air temperatures. A large portion of the glacier perimeter is ocean-terminating, suggesting possible large mass losses due to calving and submarine melting. Here we estimate the ice discharge into the ocean for the King George Island ice cap. L-band synthetic aperture radar images covering the time-span January 2008 to January 2011 over King George Island are processed using an intensity-tracking algorithm to obtain surface velocity measurements. Pixel offsets from 40 pairs of radar images are analysed and inverted to estimate a weighted average surface velocity field. Ice thicknesses are derived from simple principles of ice flow mechanics using the computed surface velocity fields and in situ thickness data. The maximum ice surface speeds reach mayor que 225 m/yr, and the total ice discharge for the analysed flux gates of King George Island is estimated to be 0.720+/-0.428 Gt/yr, corresponding to a specific mass loss of 0.64+/-0.38 m w.e./yr over the area of the entire ice cap (1127 km2). Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Ice cap King George Island Archivo Digital UPM (Universidad Politécnica de Madrid) King George Island Annals of Glaciology 54 63 111 119 |
institution |
Open Polar |
collection |
Archivo Digital UPM (Universidad Politécnica de Madrid) |
op_collection_id |
ftunivpmadrid |
language |
English |
topic |
Telecomunicaciones Geología |
spellingShingle |
Telecomunicaciones Geología Osmanoğlu, B. Braun, M. Hock, R. Navarro Valero, Francisco José Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
topic_facet |
Telecomunicaciones Geología |
description |
Glaciers on King George Island, Antarctica, have shown retreat and surface lowering in recent decades, concurrent with increasing air temperatures. A large portion of the glacier perimeter is ocean-terminating, suggesting possible large mass losses due to calving and submarine melting. Here we estimate the ice discharge into the ocean for the King George Island ice cap. L-band synthetic aperture radar images covering the time-span January 2008 to January 2011 over King George Island are processed using an intensity-tracking algorithm to obtain surface velocity measurements. Pixel offsets from 40 pairs of radar images are analysed and inverted to estimate a weighted average surface velocity field. Ice thicknesses are derived from simple principles of ice flow mechanics using the computed surface velocity fields and in situ thickness data. The maximum ice surface speeds reach mayor que 225 m/yr, and the total ice discharge for the analysed flux gates of King George Island is estimated to be 0.720+/-0.428 Gt/yr, corresponding to a specific mass loss of 0.64+/-0.38 m w.e./yr over the area of the entire ice cap (1127 km2). |
format |
Article in Journal/Newspaper |
author |
Osmanoğlu, B. Braun, M. Hock, R. Navarro Valero, Francisco José |
author_facet |
Osmanoğlu, B. Braun, M. Hock, R. Navarro Valero, Francisco José |
author_sort |
Osmanoğlu, B. |
title |
Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
title_short |
Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
title_full |
Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
title_fullStr |
Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
title_full_unstemmed |
Surface velocity and ice discharge of the ice cap on King George Island, Antarctica |
title_sort |
surface velocity and ice discharge of the ice cap on king george island, antarctica |
publisher |
E.T.S.I. Telecomunicación (UPM) |
publishDate |
2013 |
url |
https://oa.upm.es/29196/ |
geographic |
King George Island |
geographic_facet |
King George Island |
genre |
Annals of Glaciology Antarc* Antarctica Ice cap King George Island |
genre_facet |
Annals of Glaciology Antarc* Antarctica Ice cap King George Island |
op_source |
Annals of Glaciology, ISSN 0260-3055, 2013-07, Vol. 54, No. 63 |
op_relation |
http://www.ingentaconnect.com/content/igsoc/agl/2013/00000054/00000063/art00013?token=00521c426f8ed0c3ae807e2a46762c6b795d36666725532e6e2f2a673f7b2f267738703375686f49b8 info:eu-repo/semantics/altIdentifier/doi/10.3189/2013AoG63A517 https://oa.upm.es/29196/ |
op_rights |
https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/2013AoG63A517 |
container_title |
Annals of Glaciology |
container_volume |
54 |
container_issue |
63 |
container_start_page |
111 |
op_container_end_page |
119 |
_version_ |
1768384292644192256 |