Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking
The Cook Glacier drains a significant portion of the Wilkes Subglacial Basin, the largest subglacial basin in East Antarctica—which feeds the Cook Ice Shelf. The ice velocity of the Cook Ice Shelf needs to be monitored precisely and accurately, as it plays a critical role in determining the ice disc...
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MDPI AG
2023
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Online Access: | https://doi.org/10.3390/rs15123079 https://doaj.org/article/a1e5bb3a388c47c5bfd60c9529232ec7 |
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ftdoajarticles:oai:doaj.org/article:a1e5bb3a388c47c5bfd60c9529232ec7 2023-07-23T04:15:46+02:00 Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking Siung Lee Seohyeon Kim Hyunjun An Hyangsun Han 2023-06-01T00:00:00Z https://doi.org/10.3390/rs15123079 https://doaj.org/article/a1e5bb3a388c47c5bfd60c9529232ec7 EN eng MDPI AG https://www.mdpi.com/2072-4292/15/12/3079 https://doaj.org/toc/2072-4292 doi:10.3390/rs15123079 2072-4292 https://doaj.org/article/a1e5bb3a388c47c5bfd60c9529232ec7 Remote Sensing, Vol 15, Iss 3079, p 3079 (2023) Cook Ice Shelf ice velocity Sentinel-1 SAR offset tracking Science Q article 2023 ftdoajarticles https://doi.org/10.3390/rs15123079 2023-07-02T00:37:11Z The Cook Glacier drains a significant portion of the Wilkes Subglacial Basin, the largest subglacial basin in East Antarctica—which feeds the Cook Ice Shelf. The ice velocity of the Cook Ice Shelf needs to be monitored precisely and accurately, as it plays a critical role in determining the ice discharge from the Wilkes Subglacial Basin. In this study, we measured the annual ice velocities of the Cook Ice Shelf using the offset tracking technique on Sentinel-1 synthetic aperture radar images obtained from 2017 to 2022. Time-series offsets in the range and azimuth directions were determined from the offset tracking pairs with a temporal baseline of 36 days obtained from January to December of each year. Statistical evaluations of the spatiotemporal variations of the time-series offsets effectively eliminated the erroneous offsets in the original offset fields; the remaining offsets were then used to produce two-dimensional annual ice velocities. The direction of the ice flow of the Cook Ice Shelf was almost constant during the period 2017–2022, and the variations in the magnitude of annual ice velocities were investigated. The annual ice velocities of the Cook East Ice Shelf (CEIS) stayed constant and showed a gradual increase from the grounding line to the ice front, except in the western part. Ice velocities of the western part of the CEIS have not changed much at the grounding line during the 6-year period, while in the dynamic shelf ice zone, ice velocities accelerated by up to 22% because of the development of numerous crevasses and fractures. The ice velocities of the Cook West Ice Shelf (CWIS) were about two times higher than those of the CEIS and tended to increase rapidly from the grounding line to the ice front. The annual ice velocities at the grounding line of CWIS increased rapidly from 1330 to 1450 m/a over 6 years, with 70% of this acceleration observed after 2021. This was attributed to a reduction in the ice shelf volume because of the evolution of surface crevasses and rifts, leading to a ... Article in Journal/Newspaper Antarc* Antarctica Cook Glacier Cook Ice Shelf East Antarctica Ice Shelf West Ice Shelf Directory of Open Access Journals: DOAJ Articles Cook Glacier ENVELOPE(-36.191,-36.191,-54.446,-54.446) Cook Ice Shelf ENVELOPE(152.500,152.500,-68.667,-68.667) East Antarctica West Ice Shelf ENVELOPE(85.000,85.000,-67.000,-67.000) Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Remote Sensing 15 12 3079 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Cook Ice Shelf ice velocity Sentinel-1 SAR offset tracking Science Q |
spellingShingle |
Cook Ice Shelf ice velocity Sentinel-1 SAR offset tracking Science Q Siung Lee Seohyeon Kim Hyunjun An Hyangsun Han Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
topic_facet |
Cook Ice Shelf ice velocity Sentinel-1 SAR offset tracking Science Q |
description |
The Cook Glacier drains a significant portion of the Wilkes Subglacial Basin, the largest subglacial basin in East Antarctica—which feeds the Cook Ice Shelf. The ice velocity of the Cook Ice Shelf needs to be monitored precisely and accurately, as it plays a critical role in determining the ice discharge from the Wilkes Subglacial Basin. In this study, we measured the annual ice velocities of the Cook Ice Shelf using the offset tracking technique on Sentinel-1 synthetic aperture radar images obtained from 2017 to 2022. Time-series offsets in the range and azimuth directions were determined from the offset tracking pairs with a temporal baseline of 36 days obtained from January to December of each year. Statistical evaluations of the spatiotemporal variations of the time-series offsets effectively eliminated the erroneous offsets in the original offset fields; the remaining offsets were then used to produce two-dimensional annual ice velocities. The direction of the ice flow of the Cook Ice Shelf was almost constant during the period 2017–2022, and the variations in the magnitude of annual ice velocities were investigated. The annual ice velocities of the Cook East Ice Shelf (CEIS) stayed constant and showed a gradual increase from the grounding line to the ice front, except in the western part. Ice velocities of the western part of the CEIS have not changed much at the grounding line during the 6-year period, while in the dynamic shelf ice zone, ice velocities accelerated by up to 22% because of the development of numerous crevasses and fractures. The ice velocities of the Cook West Ice Shelf (CWIS) were about two times higher than those of the CEIS and tended to increase rapidly from the grounding line to the ice front. The annual ice velocities at the grounding line of CWIS increased rapidly from 1330 to 1450 m/a over 6 years, with 70% of this acceleration observed after 2021. This was attributed to a reduction in the ice shelf volume because of the evolution of surface crevasses and rifts, leading to a ... |
format |
Article in Journal/Newspaper |
author |
Siung Lee Seohyeon Kim Hyunjun An Hyangsun Han |
author_facet |
Siung Lee Seohyeon Kim Hyunjun An Hyangsun Han |
author_sort |
Siung Lee |
title |
Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
title_short |
Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
title_full |
Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
title_fullStr |
Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
title_full_unstemmed |
Ice Velocity Variations of the Cook Ice Shelf, East Antarctica, from 2017 to 2022 from Sentinel-1 SAR Time-Series Offset Tracking |
title_sort |
ice velocity variations of the cook ice shelf, east antarctica, from 2017 to 2022 from sentinel-1 sar time-series offset tracking |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/rs15123079 https://doaj.org/article/a1e5bb3a388c47c5bfd60c9529232ec7 |
long_lat |
ENVELOPE(-36.191,-36.191,-54.446,-54.446) ENVELOPE(152.500,152.500,-68.667,-68.667) ENVELOPE(85.000,85.000,-67.000,-67.000) ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Cook Glacier Cook Ice Shelf East Antarctica West Ice Shelf Wilkes Subglacial Basin |
geographic_facet |
Cook Glacier Cook Ice Shelf East Antarctica West Ice Shelf Wilkes Subglacial Basin |
genre |
Antarc* Antarctica Cook Glacier Cook Ice Shelf East Antarctica Ice Shelf West Ice Shelf |
genre_facet |
Antarc* Antarctica Cook Glacier Cook Ice Shelf East Antarctica Ice Shelf West Ice Shelf |
op_source |
Remote Sensing, Vol 15, Iss 3079, p 3079 (2023) |
op_relation |
https://www.mdpi.com/2072-4292/15/12/3079 https://doaj.org/toc/2072-4292 doi:10.3390/rs15123079 2072-4292 https://doaj.org/article/a1e5bb3a388c47c5bfd60c9529232ec7 |
op_doi |
https://doi.org/10.3390/rs15123079 |
container_title |
Remote Sensing |
container_volume |
15 |
container_issue |
12 |
container_start_page |
3079 |
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1772176786374787072 |