On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms
We investigate limitations of the one-dimensional elastic beam model to detect grounding line and thickness of an ice shelf from a differential interferogram. Spatial limitations due to grounding line curvature and variable ice thickness are analyzed by comparison with two-dimensional plate flexure....
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ftdlr:oai:elib.dlr.de:390 2024-09-15T17:40:17+00:00 On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms Rabus, Bernd Lang, Oliver 2002 https://elib.dlr.de/390/ unknown Rabus, Bernd und Lang, Oliver (2002) On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms. Journal of Glaciology, Vol. 48 (No. 162), Seiten 345-356. Deutsches Fernerkundungsdatenzentrum Zeitschriftenbeitrag PeerReviewed 2002 ftdlr 2024-07-26T03:56:15Z We investigate limitations of the one-dimensional elastic beam model to detect grounding line and thickness of an ice shelf from a differential interferogram. Spatial limitations due to grounding line curvature and variable ice thickness are analyzed by comparison with two-dimensional plate flexure. Temporal limitations from the tide-dependent shift of the grounding line are analyzed by superpositions of four tidal flexure profiles representing differential interferograms. (i) At scales greater one ice thickness seaward protrusions of the grounding line are well represented by the elastic beam model, while landward embayments of the same scale produce significant misplacements >10 per cent of the ice thickness. (ii) For reasonable spatial variations of shelf thickness the elastic beam model gives reliable estimates of grounding line position and unfractured mean ice thickness near the grounding line. (iii) For about 20 per cent of superpositions of four tidal flexure profiles the resulting grounding line misplacements exceed the physical tidal shift of the grounding line by factors >2. For differential tide levels <10 per cent of a 1 m tide dynamics, a physical shift of the grounding line of 0.3 km per meter of tide can lever misplacements of >2 km. Examples of real interferometric profiles from West Antarctic ice shelves corroborate our results. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Journal of Glaciology German Aerospace Center: elib - DLR electronic library |
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Open Polar |
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German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
unknown |
topic |
Deutsches Fernerkundungsdatenzentrum |
spellingShingle |
Deutsches Fernerkundungsdatenzentrum Rabus, Bernd Lang, Oliver On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
topic_facet |
Deutsches Fernerkundungsdatenzentrum |
description |
We investigate limitations of the one-dimensional elastic beam model to detect grounding line and thickness of an ice shelf from a differential interferogram. Spatial limitations due to grounding line curvature and variable ice thickness are analyzed by comparison with two-dimensional plate flexure. Temporal limitations from the tide-dependent shift of the grounding line are analyzed by superpositions of four tidal flexure profiles representing differential interferograms. (i) At scales greater one ice thickness seaward protrusions of the grounding line are well represented by the elastic beam model, while landward embayments of the same scale produce significant misplacements >10 per cent of the ice thickness. (ii) For reasonable spatial variations of shelf thickness the elastic beam model gives reliable estimates of grounding line position and unfractured mean ice thickness near the grounding line. (iii) For about 20 per cent of superpositions of four tidal flexure profiles the resulting grounding line misplacements exceed the physical tidal shift of the grounding line by factors >2. For differential tide levels <10 per cent of a 1 m tide dynamics, a physical shift of the grounding line of 0.3 km per meter of tide can lever misplacements of >2 km. Examples of real interferometric profiles from West Antarctic ice shelves corroborate our results. |
format |
Article in Journal/Newspaper |
author |
Rabus, Bernd Lang, Oliver |
author_facet |
Rabus, Bernd Lang, Oliver |
author_sort |
Rabus, Bernd |
title |
On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
title_short |
On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
title_full |
On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
title_fullStr |
On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
title_full_unstemmed |
On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms |
title_sort |
on the representation of ice shelf grounding zones in sar-interferograms |
publishDate |
2002 |
url |
https://elib.dlr.de/390/ |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Journal of Glaciology |
op_relation |
Rabus, Bernd und Lang, Oliver (2002) On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms. Journal of Glaciology, Vol. 48 (No. 162), Seiten 345-356. |
_version_ |
1810486148579983360 |