Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method
The grounding line position of glaciers and ice shelves is an essential observation for the study of the Earth’s ice sheets. However, in some locations, such as the Antarctic Peninsula, where many grounding lines have not been mapped since the 1990s, remote sensing of grounding line position remains...
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ftcopernicus:oai:publications.copernicus.org:egusphere116386 2024-02-11T09:56:19+01:00 Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method Wallis, Benjamin J. Hogg, Anna E. Zhu, Yikai Hooper, Andrew 2024-01-11 application/pdf https://doi.org/10.5194/egusphere-2023-2874 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2874/ eng eng doi:10.5194/egusphere-2023-2874 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2874/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2023-2874 2024-01-15T17:24:14Z The grounding line position of glaciers and ice shelves is an essential observation for the study of the Earth’s ice sheets. However, in some locations, such as the Antarctic Peninsula, where many grounding lines have not been mapped since the 1990s, remote sensing of grounding line position remains challenging. Here we present a tidal motion offset correlation (TMOC) method for measuring the grounding line position of tidewater glaciers and ice shelves, based on the correlation between tide amplitude and synthetic aperture radar offset tracking measurements. We apply this method to the Antarctic Peninsula Ice Sheet to automatically delineate a new grounding line position for 2019–2020, with near complete coverage along 9,300 km of coastline, updating the 20-year-old record. A comparison of the TMOC grounding line to contemporaneous interferometrically-measured grounding line position shows the method has a mean seaward offset compared to interferometry of 185 m and a standard deviation of 295 m. Our results show that over the last 24 years there has been grounding line retreat at a number of fast flowing ice streams on the Antarctic Peninsula, with the most retreat concentrated in the north-eastern sector, where grounding lines have retreated following the collapse of ice shelves. We observe a maximum grounding line retreat since 1996 of 16.3 km on Hektoria Glacier, with other notable glaciers retreating by 9.3 km, 9.1 km, and 3.6 km respectively. Our results document dynamic change on Antarctic Peninsula glaciers and show the importance of using an updated grounding line location to delineate the boundary between floating and grounded ice. Text Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Tidewater Copernicus Publications: E-Journals Antarctic The Antarctic Antarctic Peninsula Hektoria Glacier ENVELOPE(-61.753,-61.753,-64.843,-64.843) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
The grounding line position of glaciers and ice shelves is an essential observation for the study of the Earth’s ice sheets. However, in some locations, such as the Antarctic Peninsula, where many grounding lines have not been mapped since the 1990s, remote sensing of grounding line position remains challenging. Here we present a tidal motion offset correlation (TMOC) method for measuring the grounding line position of tidewater glaciers and ice shelves, based on the correlation between tide amplitude and synthetic aperture radar offset tracking measurements. We apply this method to the Antarctic Peninsula Ice Sheet to automatically delineate a new grounding line position for 2019–2020, with near complete coverage along 9,300 km of coastline, updating the 20-year-old record. A comparison of the TMOC grounding line to contemporaneous interferometrically-measured grounding line position shows the method has a mean seaward offset compared to interferometry of 185 m and a standard deviation of 295 m. Our results show that over the last 24 years there has been grounding line retreat at a number of fast flowing ice streams on the Antarctic Peninsula, with the most retreat concentrated in the north-eastern sector, where grounding lines have retreated following the collapse of ice shelves. We observe a maximum grounding line retreat since 1996 of 16.3 km on Hektoria Glacier, with other notable glaciers retreating by 9.3 km, 9.1 km, and 3.6 km respectively. Our results document dynamic change on Antarctic Peninsula glaciers and show the importance of using an updated grounding line location to delineate the boundary between floating and grounded ice. |
format |
Text |
author |
Wallis, Benjamin J. Hogg, Anna E. Zhu, Yikai Hooper, Andrew |
spellingShingle |
Wallis, Benjamin J. Hogg, Anna E. Zhu, Yikai Hooper, Andrew Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
author_facet |
Wallis, Benjamin J. Hogg, Anna E. Zhu, Yikai Hooper, Andrew |
author_sort |
Wallis, Benjamin J. |
title |
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
title_short |
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
title_full |
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
title_fullStr |
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
title_full_unstemmed |
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method |
title_sort |
change in grounding line location on the antarctic peninsula measured using a tidal motion offset correlation method |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2023-2874 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2874/ |
long_lat |
ENVELOPE(-61.753,-61.753,-64.843,-64.843) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Hektoria Glacier |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Hektoria Glacier |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Tidewater |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Tidewater |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2023-2874 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2874/ |
op_doi |
https://doi.org/10.5194/egusphere-2023-2874 |
_version_ |
1790602212916854784 |