GPS-derived strain rates on an active ice shelf rift
Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thicknes...
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ftunivtasmania:oai:eprints.utas.edu.au:1466 2023-05-15T13:22:02+02:00 GPS-derived strain rates on an active ice shelf rift Janssen, V Coleman, R Bassis, JN 2009-01 application/pdf https://eprints.utas.edu.au/1466/ https://eprints.utas.edu.au/1466/1/Janssen_etal_2009_Survey_Review_journal_version.pdf http://www.ingentaconnect.com/content/maney/sre en eng https://eprints.utas.edu.au/1466/1/Janssen_etal_2009_Survey_Review_journal_version.pdf Janssen, V, Coleman, R and Bassis, JN 2009 , 'GPS-derived strain rates on an active ice shelf rift' , Survey Review, vol. 41 , pp. 14-25 . cc_utas 291000 Geomatic Engineering 291001 Geodesy 260115 Glaciology GPS strain rates ice shelf rifting Amery Ice Shelf Article PeerReviewed 2009 ftunivtasmania 2020-05-30T07:15:09Z Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thickness, precede large tabular iceberg detachment and can lead to ice shelf break-up. Changes in strain rates on an active propagating rift system on the Amery Ice Shelf, East Antarctica are determined using in-situ Global Positioning System (GPS) measurements. Results for the 2002/03 Antarctic summer period (Dec-Feb) confirm previous observations by [2] that rift propagation occurs in episodic bursts separated by several days. Transverse-to-flow (i.e. parallel-to-rift) strain rates exceed longitudinal-to-flow (i.e. normal-to-rift) rates by up to a factor of 5 and maximum principal strain rates around the rift tip vary from 12 to 21 [x 10-3/yr]. A rotation in the direction of the principal strain is evident around the rift tip, indicating a change in the mechanics of rift fracture. It is demonstrated that cumulative sum analysis [12], obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is an effective method to detect small baseline length changes. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* University of Tasmania: UTas ePrints Antarctic The Antarctic East Antarctica Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
291000 Geomatic Engineering 291001 Geodesy 260115 Glaciology GPS strain rates ice shelf rifting Amery Ice Shelf |
spellingShingle |
291000 Geomatic Engineering 291001 Geodesy 260115 Glaciology GPS strain rates ice shelf rifting Amery Ice Shelf Janssen, V Coleman, R Bassis, JN GPS-derived strain rates on an active ice shelf rift |
topic_facet |
291000 Geomatic Engineering 291001 Geodesy 260115 Glaciology GPS strain rates ice shelf rifting Amery Ice Shelf |
description |
Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thickness, precede large tabular iceberg detachment and can lead to ice shelf break-up. Changes in strain rates on an active propagating rift system on the Amery Ice Shelf, East Antarctica are determined using in-situ Global Positioning System (GPS) measurements. Results for the 2002/03 Antarctic summer period (Dec-Feb) confirm previous observations by [2] that rift propagation occurs in episodic bursts separated by several days. Transverse-to-flow (i.e. parallel-to-rift) strain rates exceed longitudinal-to-flow (i.e. normal-to-rift) rates by up to a factor of 5 and maximum principal strain rates around the rift tip vary from 12 to 21 [x 10-3/yr]. A rotation in the direction of the principal strain is evident around the rift tip, indicating a change in the mechanics of rift fracture. It is demonstrated that cumulative sum analysis [12], obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is an effective method to detect small baseline length changes. |
format |
Article in Journal/Newspaper |
author |
Janssen, V Coleman, R Bassis, JN |
author_facet |
Janssen, V Coleman, R Bassis, JN |
author_sort |
Janssen, V |
title |
GPS-derived strain rates on an active ice shelf rift |
title_short |
GPS-derived strain rates on an active ice shelf rift |
title_full |
GPS-derived strain rates on an active ice shelf rift |
title_fullStr |
GPS-derived strain rates on an active ice shelf rift |
title_full_unstemmed |
GPS-derived strain rates on an active ice shelf rift |
title_sort |
gps-derived strain rates on an active ice shelf rift |
publishDate |
2009 |
url |
https://eprints.utas.edu.au/1466/ https://eprints.utas.edu.au/1466/1/Janssen_etal_2009_Survey_Review_journal_version.pdf http://www.ingentaconnect.com/content/maney/sre |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Antarctic The Antarctic East Antarctica Amery Amery Ice Shelf |
geographic_facet |
Antarctic The Antarctic East Antarctica Amery Amery Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* |
op_relation |
https://eprints.utas.edu.au/1466/1/Janssen_etal_2009_Survey_Review_journal_version.pdf Janssen, V, Coleman, R and Bassis, JN 2009 , 'GPS-derived strain rates on an active ice shelf rift' , Survey Review, vol. 41 , pp. 14-25 . |
op_rights |
cc_utas |
_version_ |
1766363008777322496 |