Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf
Antarctica, to two confining islands eventually collapsed in early April 2009. In the month preceding the collapse, we observed deformation of the ice bridge by means of satellite imagery and from an in situ GPS station. TerraSAR-X images (acquired in stripmap mode) were used to compile a time serie...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.725.2794 2023-05-15T13:52:14+02:00 Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf A. Humbert D. Gross M. Braun M. R. Van Den Broeke D. G. Vaughan W. J. Van De Berg The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.725.2794 http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.725.2794 http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf text ftciteseerx 2016-05-29T00:01:10Z Antarctica, to two confining islands eventually collapsed in early April 2009. In the month preceding the collapse, we observed deformation of the ice bridge by means of satellite imagery and from an in situ GPS station. TerraSAR-X images (acquired in stripmap mode) were used to compile a time series. The ice bridge bent most strongly in its narrowest part (westerly), while the northern end (near Charcot Island) shifted in a northeasterly direction. In the south, the ice bridge experienced compressive strain parallel to its long axis. GPS position data were acquired a little south of the narrowest part of the ice bridge from 19 January 2009. Analysis of these data showed both cyclic and monotonic components of motion. Meteorological data and re-analysis of the output of weather-prediction models indicated that easterly winds were responsible for the cyclic motion component. In particular, wind stress on the rough ice melange that occupied the area to the east exerted significant pressure on the ice bridge. The collapse of the ice bridge began with crack formation in the southern section parallel to the long axis of the ice bridge and led to shattering of the southern part. Ultimately, the narrowest part, only 900m wide, ruptured. The formation of many small icebergs released energy of>125×106 J. Text Antarc* Antarctica Charcot Island Ice Shelf Wilkins Ice Shelf Unknown Charcot ENVELOPE(139.017,139.017,-69.367,-69.367) Charcot Island ENVELOPE(-75.250,-75.250,-69.750,-69.750) Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Wilkins Ice Shelf ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
Antarctica, to two confining islands eventually collapsed in early April 2009. In the month preceding the collapse, we observed deformation of the ice bridge by means of satellite imagery and from an in situ GPS station. TerraSAR-X images (acquired in stripmap mode) were used to compile a time series. The ice bridge bent most strongly in its narrowest part (westerly), while the northern end (near Charcot Island) shifted in a northeasterly direction. In the south, the ice bridge experienced compressive strain parallel to its long axis. GPS position data were acquired a little south of the narrowest part of the ice bridge from 19 January 2009. Analysis of these data showed both cyclic and monotonic components of motion. Meteorological data and re-analysis of the output of weather-prediction models indicated that easterly winds were responsible for the cyclic motion component. In particular, wind stress on the rough ice melange that occupied the area to the east exerted significant pressure on the ice bridge. The collapse of the ice bridge began with crack formation in the southern section parallel to the long axis of the ice bridge and led to shattering of the southern part. Ultimately, the narrowest part, only 900m wide, ruptured. The formation of many small icebergs released energy of>125×106 J. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. Humbert D. Gross M. Braun M. R. Van Den Broeke D. G. Vaughan W. J. Van De Berg |
spellingShingle |
A. Humbert D. Gross M. Braun M. R. Van Den Broeke D. G. Vaughan W. J. Van De Berg Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
author_facet |
A. Humbert D. Gross M. Braun M. R. Van Den Broeke D. G. Vaughan W. J. Van De Berg |
author_sort |
A. Humbert |
title |
Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
title_short |
Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
title_full |
Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
title_fullStr |
Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
title_full_unstemmed |
Annals of Glaciology 51(55) 2010 49 Deformation and failure of the ice bridge on the Wilkins Ice Shelf |
title_sort |
annals of glaciology 51(55) 2010 49 deformation and failure of the ice bridge on the wilkins ice shelf |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.725.2794 http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf |
long_lat |
ENVELOPE(139.017,139.017,-69.367,-69.367) ENVELOPE(-75.250,-75.250,-69.750,-69.750) ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
geographic |
Charcot Charcot Island Wilkins Wilkins Ice Shelf |
geographic_facet |
Charcot Charcot Island Wilkins Wilkins Ice Shelf |
genre |
Antarc* Antarctica Charcot Island Ice Shelf Wilkins Ice Shelf |
genre_facet |
Antarc* Antarctica Charcot Island Ice Shelf Wilkins Ice Shelf |
op_source |
http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.725.2794 http://www.staff.science.uu.nl/%7Ebroek112/home.php_files/Publications_MvdB/2010_Humbert_AnnGlac.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766256502631301120 |