Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar
Regional changes in the flow velocity of Antarctic glaciers can affect the ice sheet mass balance and formation of surface crevasses. The velocity anomaly of a glacier can be detected using the Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes the constant...
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2021
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ftdoajarticles:oai:doaj.org/article:1b812784893e47489d8d53066dfc0f71 2023-05-15T13:56:12+02:00 Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar Hoonyol Lee Heejeong Seo Hyangsun Han Hyeontae Ju Joohan Lee 2021-07-01T00:00:00Z https://doi.org/10.3390/rs13142691 https://doaj.org/article/1b812784893e47489d8d53066dfc0f71 EN eng MDPI AG https://www.mdpi.com/2072-4292/13/14/2691 https://doaj.org/toc/2072-4292 doi:10.3390/rs13142691 2072-4292 https://doaj.org/article/1b812784893e47489d8d53066dfc0f71 Remote Sensing, Vol 13, Iss 2691, p 2691 (2021) Campbell Glacier DDInSAR Ice Penetrating Radar velocity anomaly Science Q article 2021 ftdoajarticles https://doi.org/10.3390/rs13142691 2022-12-31T15:09:27Z Regional changes in the flow velocity of Antarctic glaciers can affect the ice sheet mass balance and formation of surface crevasses. The velocity anomaly of a glacier can be detected using the Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes the constant displacement in two Differential Interferometric SAR (DInSAR) images at different times and shows only the temporally variable displacement. In this study, two circular-shaped ice-velocity anomalies in Campbell Glacier, East Antarctica, were analyzed by using 13 DDInSAR images generated from COSMO-SkyMED one-day tandem DInSAR images in 2010–2011. The topography of the ice surface and ice bed were obtained from the helicopter-borne Ice Penetrating Radar (IPR) surveys in 2016–2017. Denoted as A and B, the velocity anomalies were in circular shapes with radii of ~800 m, located 14.7 km (A) and 11.3 km (B) upstream from the grounding line of the Campbell Glacier. Velocity anomalies were up to ~1 cm/day for A and ~5 cm/day for B. To investigate the cause of the two velocity anomalies, the ice surface and bed profiles derived from the IPR survey crossing the anomalies were analyzed. The two anomalies lay over a bed hill along the glacial valley where stick-slip and pressure melting can occur, resulting in temporal variation of ice velocity. The bright radar reflection and flat hydraulic head at the ice bed of A observed in the IPR-derived radargram strongly suggested the existence of basal water in a form of reservoir or film, which caused smaller friction and the reduced variation of stick-slip motion compared to B. Crevasses began to appear at B due to tensile stress at the top of the hill and the fast flow downstream. The sporadic shift of the location of anomalies suggests complex pressure melting and transportation of the basal water over the bed hill. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Campbell Glacier ENVELOPE(45.683,45.683,-67.800,-67.800) Remote Sensing 13 14 2691 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Campbell Glacier DDInSAR Ice Penetrating Radar velocity anomaly Science Q |
spellingShingle |
Campbell Glacier DDInSAR Ice Penetrating Radar velocity anomaly Science Q Hoonyol Lee Heejeong Seo Hyangsun Han Hyeontae Ju Joohan Lee Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
topic_facet |
Campbell Glacier DDInSAR Ice Penetrating Radar velocity anomaly Science Q |
description |
Regional changes in the flow velocity of Antarctic glaciers can affect the ice sheet mass balance and formation of surface crevasses. The velocity anomaly of a glacier can be detected using the Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes the constant displacement in two Differential Interferometric SAR (DInSAR) images at different times and shows only the temporally variable displacement. In this study, two circular-shaped ice-velocity anomalies in Campbell Glacier, East Antarctica, were analyzed by using 13 DDInSAR images generated from COSMO-SkyMED one-day tandem DInSAR images in 2010–2011. The topography of the ice surface and ice bed were obtained from the helicopter-borne Ice Penetrating Radar (IPR) surveys in 2016–2017. Denoted as A and B, the velocity anomalies were in circular shapes with radii of ~800 m, located 14.7 km (A) and 11.3 km (B) upstream from the grounding line of the Campbell Glacier. Velocity anomalies were up to ~1 cm/day for A and ~5 cm/day for B. To investigate the cause of the two velocity anomalies, the ice surface and bed profiles derived from the IPR survey crossing the anomalies were analyzed. The two anomalies lay over a bed hill along the glacial valley where stick-slip and pressure melting can occur, resulting in temporal variation of ice velocity. The bright radar reflection and flat hydraulic head at the ice bed of A observed in the IPR-derived radargram strongly suggested the existence of basal water in a form of reservoir or film, which caused smaller friction and the reduced variation of stick-slip motion compared to B. Crevasses began to appear at B due to tensile stress at the top of the hill and the fast flow downstream. The sporadic shift of the location of anomalies suggests complex pressure melting and transportation of the basal water over the bed hill. |
format |
Article in Journal/Newspaper |
author |
Hoonyol Lee Heejeong Seo Hyangsun Han Hyeontae Ju Joohan Lee |
author_facet |
Hoonyol Lee Heejeong Seo Hyangsun Han Hyeontae Ju Joohan Lee |
author_sort |
Hoonyol Lee |
title |
Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
title_short |
Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
title_full |
Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
title_fullStr |
Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
title_full_unstemmed |
Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar |
title_sort |
velocity anomaly of campbell glacier, east antarctica, observed by double-differential interferometric sar and ice penetrating radar |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13142691 https://doaj.org/article/1b812784893e47489d8d53066dfc0f71 |
long_lat |
ENVELOPE(45.683,45.683,-67.800,-67.800) |
geographic |
Antarctic East Antarctica Campbell Glacier |
geographic_facet |
Antarctic East Antarctica Campbell Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
Remote Sensing, Vol 13, Iss 2691, p 2691 (2021) |
op_relation |
https://www.mdpi.com/2072-4292/13/14/2691 https://doaj.org/toc/2072-4292 doi:10.3390/rs13142691 2072-4292 https://doaj.org/article/1b812784893e47489d8d53066dfc0f71 |
op_doi |
https://doi.org/10.3390/rs13142691 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
14 |
container_start_page |
2691 |
_version_ |
1766263560685486080 |