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...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/1983/5a200f5d-2614-4786-85ac-7f4c18ee823b https://research-information.bris.ac.uk/en/publications/5a200f5d-2614-4786-85ac-7f4c18ee823b https://doi.org/10.5194/tc-14-3629-2020 https://research-information.bris.ac.uk/ws/files/254701663/tc_14_3629_2020_TL.pdf |
id |
ftubristolcris:oai:research-information.bris.ac.uk:publications/5a200f5d-2614-4786-85ac-7f4c18ee823b |
---|---|
record_format |
openpolar |
spelling |
ftubristolcris:oai:research-information.bris.ac.uk:publications/5a200f5d-2614-4786-85ac-7f4c18ee823b 2024-05-19T07:30:58+00:00 Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry Li, Tian Dawson, Geoffrey J Chuter, Stephen J Bamber, Jonathan L 2020-11-02 application/pdf https://hdl.handle.net/1983/5a200f5d-2614-4786-85ac-7f4c18ee823b https://research-information.bris.ac.uk/en/publications/5a200f5d-2614-4786-85ac-7f4c18ee823b https://doi.org/10.5194/tc-14-3629-2020 https://research-information.bris.ac.uk/ws/files/254701663/tc_14_3629_2020_TL.pdf eng eng https://research-information.bris.ac.uk/en/publications/5a200f5d-2614-4786-85ac-7f4c18ee823b info:eu-repo/semantics/openAccess Li , T , Dawson , G J , Chuter , S J & Bamber , J L 2020 , ' Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry ' , Cryosphere , vol. 14 , pp. 3629–3643 . https://doi.org/10.5194/tc-14-3629-2020 article 2020 ftubristolcris https://doi.org/10.5194/tc-14-3629-2020 2024-04-30T23:54:51Z 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 University of Bristol: Bristol Research The Cryosphere 14 11 3629 3643 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
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 |
Li, Tian Dawson, Geoffrey J Chuter, Stephen J Bamber, Jonathan L |
spellingShingle |
Li, Tian Dawson, Geoffrey J Chuter, Stephen J Bamber, Jonathan L Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry |
author_facet |
Li, Tian Dawson, Geoffrey J Chuter, Stephen J Bamber, Jonathan L |
author_sort |
Li, Tian |
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 |
publishDate |
2020 |
url |
https://hdl.handle.net/1983/5a200f5d-2614-4786-85ac-7f4c18ee823b https://research-information.bris.ac.uk/en/publications/5a200f5d-2614-4786-85ac-7f4c18ee823b https://doi.org/10.5194/tc-14-3629-2020 https://research-information.bris.ac.uk/ws/files/254701663/tc_14_3629_2020_TL.pdf |
genre |
Antarc* Antarctic Antarctica Hearst Island Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Hearst Island Ice Sheet Ice Shelf |
op_source |
Li , T , Dawson , G J , Chuter , S J & Bamber , J L 2020 , ' Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry ' , Cryosphere , vol. 14 , pp. 3629–3643 . https://doi.org/10.5194/tc-14-3629-2020 |
op_relation |
https://research-information.bris.ac.uk/en/publications/5a200f5d-2614-4786-85ac-7f4c18ee823b |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1799468811154358272 |