Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data
The giant tabular iceberg A68 broke away from the Larsen C Ice Shelf, Antarctic Peninsula, in July 2017. The evolution of A68 would have been affected by both the Larsen C Ice Shelf, the surrounding sea ice, and the nearby shallow seafloor. In this study, we analyze the initial evolution of iceberg...
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2019
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Online Access: | https://doi.org/10.3390/rs11040404 https://doaj.org/article/03e7f357bbf143c0befa1c7b7a4ba31f |
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ftdoajarticles:oai:doaj.org/article:03e7f357bbf143c0befa1c7b7a4ba31f 2023-05-15T13:43:17+02:00 Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data Hyangsun Han Sungjae Lee Jae-In Kim Seung Hee Kim Hyun-cheol Kim 2019-02-01T00:00:00Z https://doi.org/10.3390/rs11040404 https://doaj.org/article/03e7f357bbf143c0befa1c7b7a4ba31f EN eng MDPI AG https://www.mdpi.com/2072-4292/11/4/404 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11040404 https://doaj.org/article/03e7f357bbf143c0befa1c7b7a4ba31f Remote Sensing, Vol 11, Iss 4, p 404 (2019) iceberg A68A Larsen C Ice Shelf Antarctic Peninsula Sentinel-1 CryoSat-2 MERRA-2 Science Q article 2019 ftdoajarticles https://doi.org/10.3390/rs11040404 2022-12-31T11:06:58Z The giant tabular iceberg A68 broke away from the Larsen C Ice Shelf, Antarctic Peninsula, in July 2017. The evolution of A68 would have been affected by both the Larsen C Ice Shelf, the surrounding sea ice, and the nearby shallow seafloor. In this study, we analyze the initial evolution of iceberg A68A—the largest originating from A68—in terms of changes in its area, drift speed, rotation, and freeboard using Sentinel-1 synthetic aperture radar (SAR) images and CryoSat-2 SAR/Interferometric Radar Altimeter observations. The area of iceberg A68A sharply decreased in mid-August 2017 and mid-May 2018 via large calving events. In September 2018, its surface area increased, possibly due to its longitudinal stretching by melting of surrounding sea ice. The decrease in the area of A68A was only 2% over 1.5 years. A68A was relatively stationary until mid-July 2018, while it was surrounded by the Larsen C Ice Shelf front and a high concentration of sea ice, and when its movement was interrupted by the shallow seabed. The iceberg passed through a bay-shaped region in front of the Larsen C Ice Shelf after July 2018, showing a nearly circular motion with higher speed and greater rotation. Drift was mainly inherited from its rotation, because it was still located near the Bawden Ice Rise and could not pass through by the shallow seabed. The freeboard of iceberg A68A decreased at an average rate of −0.80 ± 0.29 m/year during February⁻November 2018, which could have been due to basal melting by warm seawater in the Antarctic summer and increasing relative velocity of iceberg and ocean currents in the winter of that year. The freeboard of the iceberg measured using CryoSat-2 could represent the returned signal from the snow surface on the iceberg. Based on this, the average rate of thickness change was estimated at −12.89 ± 3.34 m/year during the study period considering an average rate of snow accumulation of 0.82 ± 0.06 m/year predicted by reanalysis data from the Modern-Era Retrospective analysis for Research and ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Shelf Iceberg* Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula Merra ENVELOPE(12.615,12.615,65.816,65.816) Bawden Ice Rise ENVELOPE(-60.155,-60.155,-66.858,-66.858) Remote Sensing 11 4 404 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
iceberg A68A Larsen C Ice Shelf Antarctic Peninsula Sentinel-1 CryoSat-2 MERRA-2 Science Q |
spellingShingle |
iceberg A68A Larsen C Ice Shelf Antarctic Peninsula Sentinel-1 CryoSat-2 MERRA-2 Science Q Hyangsun Han Sungjae Lee Jae-In Kim Seung Hee Kim Hyun-cheol Kim Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
topic_facet |
iceberg A68A Larsen C Ice Shelf Antarctic Peninsula Sentinel-1 CryoSat-2 MERRA-2 Science Q |
description |
The giant tabular iceberg A68 broke away from the Larsen C Ice Shelf, Antarctic Peninsula, in July 2017. The evolution of A68 would have been affected by both the Larsen C Ice Shelf, the surrounding sea ice, and the nearby shallow seafloor. In this study, we analyze the initial evolution of iceberg A68A—the largest originating from A68—in terms of changes in its area, drift speed, rotation, and freeboard using Sentinel-1 synthetic aperture radar (SAR) images and CryoSat-2 SAR/Interferometric Radar Altimeter observations. The area of iceberg A68A sharply decreased in mid-August 2017 and mid-May 2018 via large calving events. In September 2018, its surface area increased, possibly due to its longitudinal stretching by melting of surrounding sea ice. The decrease in the area of A68A was only 2% over 1.5 years. A68A was relatively stationary until mid-July 2018, while it was surrounded by the Larsen C Ice Shelf front and a high concentration of sea ice, and when its movement was interrupted by the shallow seabed. The iceberg passed through a bay-shaped region in front of the Larsen C Ice Shelf after July 2018, showing a nearly circular motion with higher speed and greater rotation. Drift was mainly inherited from its rotation, because it was still located near the Bawden Ice Rise and could not pass through by the shallow seabed. The freeboard of iceberg A68A decreased at an average rate of −0.80 ± 0.29 m/year during February⁻November 2018, which could have been due to basal melting by warm seawater in the Antarctic summer and increasing relative velocity of iceberg and ocean currents in the winter of that year. The freeboard of the iceberg measured using CryoSat-2 could represent the returned signal from the snow surface on the iceberg. Based on this, the average rate of thickness change was estimated at −12.89 ± 3.34 m/year during the study period considering an average rate of snow accumulation of 0.82 ± 0.06 m/year predicted by reanalysis data from the Modern-Era Retrospective analysis for Research and ... |
format |
Article in Journal/Newspaper |
author |
Hyangsun Han Sungjae Lee Jae-In Kim Seung Hee Kim Hyun-cheol Kim |
author_facet |
Hyangsun Han Sungjae Lee Jae-In Kim Seung Hee Kim Hyun-cheol Kim |
author_sort |
Hyangsun Han |
title |
Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
title_short |
Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
title_full |
Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
title_fullStr |
Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
title_full_unstemmed |
Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data |
title_sort |
changes in a giant iceberg created from the collapse of the larsen c ice shelf, antarctic peninsula, derived from sentinel-1 and cryosat-2 data |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/rs11040404 https://doaj.org/article/03e7f357bbf143c0befa1c7b7a4ba31f |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) ENVELOPE(-60.155,-60.155,-66.858,-66.858) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Merra Bawden Ice Rise |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Merra Bawden Ice Rise |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Iceberg* Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Iceberg* Sea ice |
op_source |
Remote Sensing, Vol 11, Iss 4, p 404 (2019) |
op_relation |
https://www.mdpi.com/2072-4292/11/4/404 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11040404 https://doaj.org/article/03e7f357bbf143c0befa1c7b7a4ba31f |
op_doi |
https://doi.org/10.3390/rs11040404 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
4 |
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404 |
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