The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves
Surface meltwater drains on several Antarctic ice shelves, resulting in surface and sub-surface lakes that are potentially critical for the ice shelf collapse. Despite these phenomena, our understanding and assessment of the drainage and refreezing of these lakes is limited, mainly due to lack of fi...
Published in: | The Cryosphere |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00058973 2024-09-15T17:42:21+00:00 The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves Li, Weiran Lhermitte, Stef López-Dekker, Paco 2021-12 electronic https://doi.org/10.5194/tc-15-5309-2021 https://noa.gwlb.de/receive/cop_mods_00058973 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00058582/tc-15-5309-2021.pdf https://tc.copernicus.org/articles/15/5309/2021/tc-15-5309-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-5309-2021 https://noa.gwlb.de/receive/cop_mods_00058973 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00058582/tc-15-5309-2021.pdf https://tc.copernicus.org/articles/15/5309/2021/tc-15-5309-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-5309-2021 2024-06-26T04:36:34Z Surface meltwater drains on several Antarctic ice shelves, resulting in surface and sub-surface lakes that are potentially critical for the ice shelf collapse. Despite these phenomena, our understanding and assessment of the drainage and refreezing of these lakes is limited, mainly due to lack of field observations and to the limitations of optical satellite imagery during polar night and in cloudy conditions. This paper explores the potential of backscatter intensity and of interferometric coherence and phase from synthetic aperture radar (SAR) imagery as an alternative to assess the dynamics of meltwater lakes. In four case study regions over Amery and Roi Baudouin ice shelves, East Antarctica, we examine spatial and temporal variations in SAR backscatter intensity and interferometric (InSAR) coherence and phase over several lakes derived from Sentinel-1A/B C-band SAR imagery. Throughout the year, the lakes are observed in a completely frozen state, in a partially frozen state with a floating ice lid and as open-water lakes. Our analysis reveals that the meltwater lake delineation is challenging during the melting period when the contrast between melting snow and lakes is indistinguishable. Despite this finding, we show using a combination of backscatter and InSAR observations that lake dynamics can be effectively captured during other non-summertime months. Moreover, our findings highlight the utility of InSAR-based observations for discriminating between refrozen ice and sub-surface meltwater and indicate the potential for phase-based detection and monitoring of rapid meltwater drainage events. The potential of this technique to monitor these meltwater change events is, however, strongly determined by the satellite revisit interval and potential changes in scattering properties due to snowfall or melt events. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves polar night The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 15 12 5309 5322 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Li, Weiran Lhermitte, Stef López-Dekker, Paco The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
topic_facet |
article Verlagsveröffentlichung |
description |
Surface meltwater drains on several Antarctic ice shelves, resulting in surface and sub-surface lakes that are potentially critical for the ice shelf collapse. Despite these phenomena, our understanding and assessment of the drainage and refreezing of these lakes is limited, mainly due to lack of field observations and to the limitations of optical satellite imagery during polar night and in cloudy conditions. This paper explores the potential of backscatter intensity and of interferometric coherence and phase from synthetic aperture radar (SAR) imagery as an alternative to assess the dynamics of meltwater lakes. In four case study regions over Amery and Roi Baudouin ice shelves, East Antarctica, we examine spatial and temporal variations in SAR backscatter intensity and interferometric (InSAR) coherence and phase over several lakes derived from Sentinel-1A/B C-band SAR imagery. Throughout the year, the lakes are observed in a completely frozen state, in a partially frozen state with a floating ice lid and as open-water lakes. Our analysis reveals that the meltwater lake delineation is challenging during the melting period when the contrast between melting snow and lakes is indistinguishable. Despite this finding, we show using a combination of backscatter and InSAR observations that lake dynamics can be effectively captured during other non-summertime months. Moreover, our findings highlight the utility of InSAR-based observations for discriminating between refrozen ice and sub-surface meltwater and indicate the potential for phase-based detection and monitoring of rapid meltwater drainage events. The potential of this technique to monitor these meltwater change events is, however, strongly determined by the satellite revisit interval and potential changes in scattering properties due to snowfall or melt events. |
format |
Article in Journal/Newspaper |
author |
Li, Weiran Lhermitte, Stef López-Dekker, Paco |
author_facet |
Li, Weiran Lhermitte, Stef López-Dekker, Paco |
author_sort |
Li, Weiran |
title |
The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
title_short |
The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
title_full |
The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
title_fullStr |
The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
title_full_unstemmed |
The potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on Antarctic ice shelves |
title_sort |
potential of synthetic aperture radar interferometry for assessing meltwater lake dynamics on antarctic ice shelves |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-5309-2021 https://noa.gwlb.de/receive/cop_mods_00058973 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00058582/tc-15-5309-2021.pdf https://tc.copernicus.org/articles/15/5309/2021/tc-15-5309-2021.pdf |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves polar night The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves polar night The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-5309-2021 https://noa.gwlb.de/receive/cop_mods_00058973 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00058582/tc-15-5309-2021.pdf https://tc.copernicus.org/articles/15/5309/2021/tc-15-5309-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-5309-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
12 |
container_start_page |
5309 |
op_container_end_page |
5322 |
_version_ |
1810488876114903040 |