Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data
The Larsen C Ice Shelf (LCIS) is the largest ice shelf in the Antarctica Peninsula, and its state can be considered to be an indicator of local climate change. The goal of this paper is to invert the rigidity of the LCIS based on the interferometric synthetic aperture radar (InSAR) technique using S...
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ftdoajarticles:oai:doaj.org/article:317c6a46463d4be68195db60b49fa4b6 2023-05-15T13:39:32+02:00 Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data Faming Gong Kui Zhang Shujun Liu 2021-06-01T00:00:00Z https://doi.org/10.3390/rs13122361 https://doaj.org/article/317c6a46463d4be68195db60b49fa4b6 EN eng MDPI AG https://www.mdpi.com/2072-4292/13/12/2361 https://doaj.org/toc/2072-4292 doi:10.3390/rs13122361 2072-4292 https://doaj.org/article/317c6a46463d4be68195db60b49fa4b6 Remote Sensing, Vol 13, Iss 2361, p 2361 (2021) InSAR ice velocity field Sentinel-1 images missing data recovering ice rigidity inversion Science Q article 2021 ftdoajarticles https://doi.org/10.3390/rs13122361 2022-12-31T16:18:28Z The Larsen C Ice Shelf (LCIS) is the largest ice shelf in the Antarctica Peninsula, and its state can be considered to be an indicator of local climate change. The goal of this paper is to invert the rigidity of the LCIS based on the interferometric synthetic aperture radar (InSAR) technique using Sentinel-1 images. A targeted processing chain is first used to obtain reliable interferometric phase measurements under the circumstance of rapid ice flow. Unfortunately, only the descending data are available, which disallows the corresponding 2-D velocity field to be directly obtained from such measurements. A new approach is thus proposed to estimate the interferometric phase-based 2-D velocity field with the assistance of speckle tracking offsets. This approach establishes an implicit relationship between range and azimuth displacements based on speckle tracking observations. By taking advantage of such a relationship, the equivalent interferometric signals in the azimuth direction are estimated, thereby recovering the interferometric phase-based 2-D ice velocity field of the LCIS. To further investigate the state of the LCIS, the recovered 2-D velocity field is utilized to invert the ice rigidity. The shallow-shelf approximation (SSA) is the core of the reverse model, which is closely dependent on boundary conditions, including kinematic and dynamic conditions. The experimental results demonstrate that the spatial distribution of the rigidity varies approximately from 70 MPa·s <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup></semantics></math> to 300 MPa·s <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup></semantics></math> . This ... Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Directory of Open Access Journals: DOAJ Articles Remote Sensing 13 12 2361 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
InSAR ice velocity field Sentinel-1 images missing data recovering ice rigidity inversion Science Q |
spellingShingle |
InSAR ice velocity field Sentinel-1 images missing data recovering ice rigidity inversion Science Q Faming Gong Kui Zhang Shujun Liu Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
topic_facet |
InSAR ice velocity field Sentinel-1 images missing data recovering ice rigidity inversion Science Q |
description |
The Larsen C Ice Shelf (LCIS) is the largest ice shelf in the Antarctica Peninsula, and its state can be considered to be an indicator of local climate change. The goal of this paper is to invert the rigidity of the LCIS based on the interferometric synthetic aperture radar (InSAR) technique using Sentinel-1 images. A targeted processing chain is first used to obtain reliable interferometric phase measurements under the circumstance of rapid ice flow. Unfortunately, only the descending data are available, which disallows the corresponding 2-D velocity field to be directly obtained from such measurements. A new approach is thus proposed to estimate the interferometric phase-based 2-D velocity field with the assistance of speckle tracking offsets. This approach establishes an implicit relationship between range and azimuth displacements based on speckle tracking observations. By taking advantage of such a relationship, the equivalent interferometric signals in the azimuth direction are estimated, thereby recovering the interferometric phase-based 2-D ice velocity field of the LCIS. To further investigate the state of the LCIS, the recovered 2-D velocity field is utilized to invert the ice rigidity. The shallow-shelf approximation (SSA) is the core of the reverse model, which is closely dependent on boundary conditions, including kinematic and dynamic conditions. The experimental results demonstrate that the spatial distribution of the rigidity varies approximately from 70 MPa·s <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup></semantics></math> to 300 MPa·s <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup></semantics></math> . This ... |
format |
Article in Journal/Newspaper |
author |
Faming Gong Kui Zhang Shujun Liu |
author_facet |
Faming Gong Kui Zhang Shujun Liu |
author_sort |
Faming Gong |
title |
Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
title_short |
Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
title_full |
Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
title_fullStr |
Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
title_full_unstemmed |
Retrieve Ice Velocities and Invert Spatial Rigidity of the Larsen C Ice Shelf Based on Sentinel-1 Interferometric Data |
title_sort |
retrieve ice velocities and invert spatial rigidity of the larsen c ice shelf based on sentinel-1 interferometric data |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13122361 https://doaj.org/article/317c6a46463d4be68195db60b49fa4b6 |
genre |
Antarc* Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf |
op_source |
Remote Sensing, Vol 13, Iss 2361, p 2361 (2021) |
op_relation |
https://www.mdpi.com/2072-4292/13/12/2361 https://doaj.org/toc/2072-4292 doi:10.3390/rs13122361 2072-4292 https://doaj.org/article/317c6a46463d4be68195db60b49fa4b6 |
op_doi |
https://doi.org/10.3390/rs13122361 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
12 |
container_start_page |
2361 |
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1766119990109405184 |