A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry
The Antarctic grounding zone, which is the transition between the fully grounded ice sheet to freely floating ice shelf, plays a critical role in ice sheet stability, mass budget calculations, and ice sheet model projections. It is therefore important to continuously monitor its location and migrati...
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ftdoajarticles:oai:doaj.org/article:660e9c55572d4f049a3ad59d9aea1d85 2023-05-15T13:23:59+02:00 A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry T. Li G. J. Dawson S. J. Chuter J. L. Bamber 2022-02-01T00:00:00Z https://doi.org/10.5194/essd-14-535-2022 https://doaj.org/article/660e9c55572d4f049a3ad59d9aea1d85 EN eng Copernicus Publications https://essd.copernicus.org/articles/14/535/2022/essd-14-535-2022.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-14-535-2022 1866-3508 1866-3516 https://doaj.org/article/660e9c55572d4f049a3ad59d9aea1d85 Earth System Science Data, Vol 14, Pp 535-557 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/essd-14-535-2022 2022-12-31T03:35:39Z The Antarctic grounding zone, which is the transition between the fully grounded ice sheet to freely floating ice shelf, plays a critical role in ice sheet stability, mass budget calculations, and ice sheet model projections. It is therefore important to continuously monitor its location and migration over time. Here we present the first ICESat-2-derived high-resolution grounding zone product of the Antarctic Ice Sheet, including three important boundaries: the inland limit of tidal flexure (Point F), inshore limit of hydrostatic equilibrium (Point H), and the break in slope (Point I b ). This dataset was derived from automated techniques developed in this study, using ICESat-2 laser altimetry repeat tracks between 30 March 2019 and 30 September 2020. The new grounding zone product has a near-complete coverage of the Antarctic Ice Sheet with a total of 21 346 Point F, 18 149 Point H, and 36 765 Point I b locations identified, including the difficult-to-survey grounding zones, such as the fast-flowing glaciers draining into the Amundsen Sea embayment. The locations of newly derived ICESat-2 landward limit of tidal flexure agree well with the most recent differential synthetic aperture radar interferometry (DInSAR) observations in 2018, with a mean absolute separation and standard deviation of 0.02 and 0.02 km, respectively. By comparing the ICESat-2-derived grounding zone with the previous grounding zone products, we find a grounding line retreat of up to 15 km on the Crary Ice Rise of Ross Ice Shelf and a pervasive landward grounding line migration along the Amundsen Sea embayment during the past 2 decades. We also identify the presence of ice plains on the Filchner–Ronne Ice Shelf and the influence of oscillating ocean tides on grounding zone migration. The product derived from this study is available at https://doi.org/10.5523/bris.bnqqyngt89eo26qk8keckglww (Li et al., 2021) and is archived and maintained at the National Snow and Ice Data Center. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf National Snow and Ice Data Center Ronne Ice Shelf Ross Ice Shelf Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Amundsen Sea Ross Ice Shelf Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Crary Ice Rise ENVELOPE(-172.500,-172.500,-82.933,-82.933) Earth System Science Data 14 2 535 557 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 T. Li G. J. Dawson S. J. Chuter J. L. Bamber A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The Antarctic grounding zone, which is the transition between the fully grounded ice sheet to freely floating ice shelf, plays a critical role in ice sheet stability, mass budget calculations, and ice sheet model projections. It is therefore important to continuously monitor its location and migration over time. Here we present the first ICESat-2-derived high-resolution grounding zone product of the Antarctic Ice Sheet, including three important boundaries: the inland limit of tidal flexure (Point F), inshore limit of hydrostatic equilibrium (Point H), and the break in slope (Point I b ). This dataset was derived from automated techniques developed in this study, using ICESat-2 laser altimetry repeat tracks between 30 March 2019 and 30 September 2020. The new grounding zone product has a near-complete coverage of the Antarctic Ice Sheet with a total of 21 346 Point F, 18 149 Point H, and 36 765 Point I b locations identified, including the difficult-to-survey grounding zones, such as the fast-flowing glaciers draining into the Amundsen Sea embayment. The locations of newly derived ICESat-2 landward limit of tidal flexure agree well with the most recent differential synthetic aperture radar interferometry (DInSAR) observations in 2018, with a mean absolute separation and standard deviation of 0.02 and 0.02 km, respectively. By comparing the ICESat-2-derived grounding zone with the previous grounding zone products, we find a grounding line retreat of up to 15 km on the Crary Ice Rise of Ross Ice Shelf and a pervasive landward grounding line migration along the Amundsen Sea embayment during the past 2 decades. We also identify the presence of ice plains on the Filchner–Ronne Ice Shelf and the influence of oscillating ocean tides on grounding zone migration. The product derived from this study is available at https://doi.org/10.5523/bris.bnqqyngt89eo26qk8keckglww (Li et al., 2021) and is archived and maintained at the National Snow and Ice Data Center. |
format |
Article in Journal/Newspaper |
author |
T. Li G. J. Dawson S. J. Chuter J. L. Bamber |
author_facet |
T. Li G. J. Dawson S. J. Chuter J. L. Bamber |
author_sort |
T. Li |
title |
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
title_short |
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
title_full |
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
title_fullStr |
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
title_full_unstemmed |
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry |
title_sort |
high-resolution antarctic grounding zone product from icesat-2 laser altimetry |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/essd-14-535-2022 https://doaj.org/article/660e9c55572d4f049a3ad59d9aea1d85 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-172.500,-172.500,-82.933,-82.933) |
geographic |
Antarctic The Antarctic Amundsen Sea Ross Ice Shelf Ronne Ice Shelf Crary Ice Rise |
geographic_facet |
Antarctic The Antarctic Amundsen Sea Ross Ice Shelf Ronne Ice Shelf Crary Ice Rise |
genre |
Amundsen Sea Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf National Snow and Ice Data Center Ronne Ice Shelf Ross Ice Shelf |
genre_facet |
Amundsen Sea Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf National Snow and Ice Data Center Ronne Ice Shelf Ross Ice Shelf |
op_source |
Earth System Science Data, Vol 14, Pp 535-557 (2022) |
op_relation |
https://essd.copernicus.org/articles/14/535/2022/essd-14-535-2022.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-14-535-2022 1866-3508 1866-3516 https://doaj.org/article/660e9c55572d4f049a3ad59d9aea1d85 |
op_doi |
https://doi.org/10.5194/essd-14-535-2022 |
container_title |
Earth System Science Data |
container_volume |
14 |
container_issue |
2 |
container_start_page |
535 |
op_container_end_page |
557 |
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1766376719132917760 |