Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry
We present a new, fully automated method of mapping the Antarctic Ice Sheet's grounding zone using a repeat-track analysis and crossover analysis of newly acquired ICESat-2 laser altimeter data. We map the position of the landward limit of tidal flexure and the inshore limit of hydrostatic equi...
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ftdoajarticles:oai:doaj.org/article:781f8cd900844daabc276966896a0214 2023-05-15T13:47:33+02:00 Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry T. Li G. J. Dawson S. J. Chuter J. L. Bamber 2020-11-01T00:00:00Z https://doi.org/10.5194/tc-14-3629-2020 https://doaj.org/article/781f8cd900844daabc276966896a0214 EN eng Copernicus Publications https://tc.copernicus.org/articles/14/3629/2020/tc-14-3629-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3629-2020 1994-0416 1994-0424 https://doaj.org/article/781f8cd900844daabc276966896a0214 The Cryosphere, Vol 14, Pp 3629-3643 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-3629-2020 2022-12-31T14:52:24Z We present a new, fully automated method of mapping the Antarctic Ice Sheet's grounding zone using a repeat-track analysis and crossover analysis of newly acquired ICESat-2 laser altimeter data. We map the position of the landward limit of tidal flexure and the inshore limit of hydrostatic equilibrium, as demonstrated over the mountainous and hitherto difficult to survey grounding zone of Larsen C Ice Shelf. Since the start of data acquisition in 2018, our method has already achieved a near 9-fold increase in the number of grounding zone observations compared with ICESat, which operated between 2003 and 2009. We have improved coverage in particular over the previously poorly mapped the Bawden and Gipps ice rises and Hearst Island. Acting as a reliable proxy for the grounding line, which cannot be directly imaged by satellites, our ICESat-2-derived landward limit of tidal flexure locations agrees well with independently obtained measurements, with a mean absolute difference and standard deviation of 0.39 and 0.32 km, respectively, compared to interferometric synthetic-aperture-radar-based observations. Our results demonstrate the efficiency, density, and high spatial accuracy with which ICESat-2 can image complex grounding zones and its clear potential for future mapping of the pan-ice sheet grounding zone. Article in Journal/Newspaper Antarc* Antarctic Antarctica Hearst Island Ice Sheet Ice Shelf The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Hearst ENVELOPE(-62.167,-62.167,-69.433,-69.433) Hearst Island ENVELOPE(-62.167,-62.167,-69.417,-69.417) The Cryosphere 14 11 3629 3643 |
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 Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We present a new, fully automated method of mapping the Antarctic Ice Sheet's grounding zone using a repeat-track analysis and crossover analysis of newly acquired ICESat-2 laser altimeter data. We map the position of the landward limit of tidal flexure and the inshore limit of hydrostatic equilibrium, as demonstrated over the mountainous and hitherto difficult to survey grounding zone of Larsen C Ice Shelf. Since the start of data acquisition in 2018, our method has already achieved a near 9-fold increase in the number of grounding zone observations compared with ICESat, which operated between 2003 and 2009. We have improved coverage in particular over the previously poorly mapped the Bawden and Gipps ice rises and Hearst Island. Acting as a reliable proxy for the grounding line, which cannot be directly imaged by satellites, our ICESat-2-derived landward limit of tidal flexure locations agrees well with independently obtained measurements, with a mean absolute difference and standard deviation of 0.39 and 0.32 km, respectively, compared to interferometric synthetic-aperture-radar-based observations. Our results demonstrate the efficiency, density, and high spatial accuracy with which ICESat-2 can image complex grounding zones and its clear potential for future mapping of the pan-ice sheet grounding zone. |
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 |
Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
title_short |
Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
title_full |
Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
title_fullStr |
Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
title_full_unstemmed |
Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
title_sort |
mapping the grounding zone of larsen c ice shelf, antarctica, from icesat-2 laser altimetry |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3629-2020 https://doaj.org/article/781f8cd900844daabc276966896a0214 |
long_lat |
ENVELOPE(-62.167,-62.167,-69.433,-69.433) ENVELOPE(-62.167,-62.167,-69.417,-69.417) |
geographic |
Antarctic The Antarctic Hearst Hearst Island |
geographic_facet |
Antarctic The Antarctic Hearst Hearst Island |
genre |
Antarc* Antarctic Antarctica Hearst Island Ice Sheet Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Hearst Island Ice Sheet Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 3629-3643 (2020) |
op_relation |
https://tc.copernicus.org/articles/14/3629/2020/tc-14-3629-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3629-2020 1994-0416 1994-0424 https://doaj.org/article/781f8cd900844daabc276966896a0214 |
op_doi |
https://doi.org/10.5194/tc-14-3629-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
11 |
container_start_page |
3629 |
op_container_end_page |
3643 |
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1766247287099490304 |