Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry
We present the results of mapping the grounding zone of the Antarctic Ice Sheet using laser altimetry from the ICESat-2 satellite, based on a combination of repeat track data and crossover analysis of ascending and descending tracks. We use a new automated method to provide estimates for both the la...
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ftcopernicus:oai:publications.copernicus.org:tcd85028 2023-05-15T13:55:28+02:00 Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry Li, Tian Dawson, Geoffrey J. Chuter, Stephen J. Bamber, Jonathan L. 2020-05-25 application/pdf https://doi.org/10.5194/tc-2020-105 https://tc.copernicus.org/preprints/tc-2020-105/ eng eng doi:10.5194/tc-2020-105 https://tc.copernicus.org/preprints/tc-2020-105/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-2020-105 2020-07-20T16:22:09Z We present the results of mapping the grounding zone of the Antarctic Ice Sheet using laser altimetry from the ICESat-2 satellite, based on a combination of repeat track data and crossover analysis of ascending and descending tracks. We use a new automated method to provide estimates for both the landward limit of ice flexure and the inshore limit of hydrostatic equilibrium by detecting the ocean tidal signals, and is demonstrated on the Larsen C Ice Shelf in the Antarctic Peninsula. The results show a 2 times increase in number of observations of the grounding line location compared to ICESat-1, as well as improved precision. The mean absolute separation and the standard deviation between our ICESat-2 derived grounding line and DInSAR grounding line product are 0.29 km and 0.31 km, respectively. The beam pair structure of ICESat-2 enables us to derive the grounding zone features from a minimum of two repeat cycles. Our results demonstrate that ICESat-2 can provide high precision and density observations of grounding line in both space and time. This new method can improve the efficiency of grounding zone calculation and can be applied to other regions of the Antarctic Ice Sheet. Text Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Copernicus Publications: E-Journals Antarctic Antarctic Peninsula The Antarctic |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We present the results of mapping the grounding zone of the Antarctic Ice Sheet using laser altimetry from the ICESat-2 satellite, based on a combination of repeat track data and crossover analysis of ascending and descending tracks. We use a new automated method to provide estimates for both the landward limit of ice flexure and the inshore limit of hydrostatic equilibrium by detecting the ocean tidal signals, and is demonstrated on the Larsen C Ice Shelf in the Antarctic Peninsula. The results show a 2 times increase in number of observations of the grounding line location compared to ICESat-1, as well as improved precision. The mean absolute separation and the standard deviation between our ICESat-2 derived grounding line and DInSAR grounding line product are 0.29 km and 0.31 km, respectively. The beam pair structure of ICESat-2 enables us to derive the grounding zone features from a minimum of two repeat cycles. Our results demonstrate that ICESat-2 can provide high precision and density observations of grounding line in both space and time. This new method can improve the efficiency of grounding zone calculation and can be applied to other regions of the Antarctic Ice Sheet. |
format |
Text |
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 Antarctic Grounding Zone 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 Antarctic Grounding Zone from ICESat-2 Laser Altimetry |
title_short |
Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry |
title_full |
Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry |
title_fullStr |
Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry |
title_full_unstemmed |
Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry |
title_sort |
mapping the antarctic grounding zone from icesat-2 laser altimetry |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-2020-105 https://tc.copernicus.org/preprints/tc-2020-105/ |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2020-105 https://tc.copernicus.org/preprints/tc-2020-105/ |
op_doi |
https://doi.org/10.5194/tc-2020-105 |
_version_ |
1766262089420111872 |