Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica.
Interferometric radar images collected by ERS-1, ERS-2 and RADARSAT-1 are used to observe the rupture tip of rifts that propagate along Hemmen Ice Rise on the Ronne Ice Shelf, Antarctica. Interferograms generated in 1992 and 1997 allow for the observation of ice deformation accumulated over 9 and 24...
Main Authors: | , , |
---|---|
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2004
|
Subjects: | |
Online Access: | https://hal.science/hal-00018882 |
id |
ftecolecentrpar:oai:HAL:hal-00018882v1 |
---|---|
record_format |
openpolar |
spelling |
ftecolecentrpar:oai:HAL:hal-00018882v1 2023-08-15T12:38:51+02:00 Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. Larour, Eric Rignot, E. Aubry, Denis Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) Laboratoire de mécanique des sols, structures et matériaux (MSSMat) CentraleSupélec-Centre National de la Recherche Scientifique (CNRS) 2004 https://hal.science/hal-00018882 en eng HAL CCSD International Glaciological Society hal-00018882 https://hal.science/hal-00018882 ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-00018882 Journal of Glaciology, 2004, 50 (170), pp.329-341 fracture-mechanics approach radar interferometry sar interferometry filchner penetration crevasses glaciers dynamics front info:eu-repo/semantics/article Journal articles 2004 ftecolecentrpar 2023-07-25T20:24:09Z Interferometric radar images collected by ERS-1, ERS-2 and RADARSAT-1 are used to observe the rupture tip of rifts that propagate along Hemmen Ice Rise on the Ronne Ice Shelf, Antarctica. Interferograms generated in 1992 and 1997 allow for the observation of ice deformation accumulated over 9 and 24 days respectively. These interferograms are combined, in order to separate the continuous process of creep deformation from the more cyclic motion caused by variations in ocean tide. An examination of local gradients in creep deformation reveals the pattern of ice deformation around and near the rupture tips and rifts with great precision (up to 10 cm a(-1)). We compare the observations with a deformation model for ice and obtain the following results: (1) The tidal oscillation of the Ronne Ice Shelf only yields small deformations along the rifts and near the rupture tips. (2) Along the ice front, the rifts and at the rupture tips, vertical bending is observed which is well explained by a model of viscous deformation of ice. Furthermore, the model indicates that the deformation pattern observed at the rupture tips is a sensitive indicator of the propagation state of the rifts (i.e. active vs inactive). (3) The viscous adjustment of ice is the dominant mode of deformation, masking the deformation pattern predicted by linear elastic fracture mechanics (LEFM). (4) Yet, at a spatial scale equivalent to the length of a rift, the propagation rate is well predicted by LEFM. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Journal of Glaciology Ronne Ice Shelf École Centrale Paris: HAL-ECP Hemmen Ice Rise ENVELOPE(-49.767,-49.767,-77.950,-77.950) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
institution |
Open Polar |
collection |
École Centrale Paris: HAL-ECP |
op_collection_id |
ftecolecentrpar |
language |
English |
topic |
fracture-mechanics approach radar interferometry sar interferometry filchner penetration crevasses glaciers dynamics front |
spellingShingle |
fracture-mechanics approach radar interferometry sar interferometry filchner penetration crevasses glaciers dynamics front Larour, Eric Rignot, E. Aubry, Denis Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
topic_facet |
fracture-mechanics approach radar interferometry sar interferometry filchner penetration crevasses glaciers dynamics front |
description |
Interferometric radar images collected by ERS-1, ERS-2 and RADARSAT-1 are used to observe the rupture tip of rifts that propagate along Hemmen Ice Rise on the Ronne Ice Shelf, Antarctica. Interferograms generated in 1992 and 1997 allow for the observation of ice deformation accumulated over 9 and 24 days respectively. These interferograms are combined, in order to separate the continuous process of creep deformation from the more cyclic motion caused by variations in ocean tide. An examination of local gradients in creep deformation reveals the pattern of ice deformation around and near the rupture tips and rifts with great precision (up to 10 cm a(-1)). We compare the observations with a deformation model for ice and obtain the following results: (1) The tidal oscillation of the Ronne Ice Shelf only yields small deformations along the rifts and near the rupture tips. (2) Along the ice front, the rifts and at the rupture tips, vertical bending is observed which is well explained by a model of viscous deformation of ice. Furthermore, the model indicates that the deformation pattern observed at the rupture tips is a sensitive indicator of the propagation state of the rifts (i.e. active vs inactive). (3) The viscous adjustment of ice is the dominant mode of deformation, masking the deformation pattern predicted by linear elastic fracture mechanics (LEFM). (4) Yet, at a spatial scale equivalent to the length of a rift, the propagation rate is well predicted by LEFM. |
author2 |
Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) Laboratoire de mécanique des sols, structures et matériaux (MSSMat) CentraleSupélec-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Larour, Eric Rignot, E. Aubry, Denis |
author_facet |
Larour, Eric Rignot, E. Aubry, Denis |
author_sort |
Larour, Eric |
title |
Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
title_short |
Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
title_full |
Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
title_fullStr |
Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
title_full_unstemmed |
Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica. |
title_sort |
processes involved in the propagation of rifts near hemmen ice rise, ronne ice shelf, antarctica. |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00018882 |
long_lat |
ENVELOPE(-49.767,-49.767,-77.950,-77.950) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Hemmen Ice Rise Ronne Ice Shelf |
geographic_facet |
Hemmen Ice Rise Ronne Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf Journal of Glaciology Ronne Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf Journal of Glaciology Ronne Ice Shelf |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-00018882 Journal of Glaciology, 2004, 50 (170), pp.329-341 |
op_relation |
hal-00018882 https://hal.science/hal-00018882 |
_version_ |
1774300331573772288 |