Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals
Supraglacial lakes and melt ponds occur in the ablation zones of Antarctica and Greenland during the summer months. Detection of lake extent, depth, and temporal evolution is important for understanding glacier dynamics. Previous remote sensing observations of lake depth are limited to estimates fro...
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2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054810 2024-09-15T17:35:21+00:00 Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals Fair, Zachary Flanner, Mark Brunt, Kelly M. Fricker, Helen Amanda Gardner, Alex 2020-11 electronic https://doi.org/10.5194/tc-14-4253-2020 https://noa.gwlb.de/receive/cop_mods_00054810 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054461/tc-14-4253-2020.pdf https://tc.copernicus.org/articles/14/4253/2020/tc-14-4253-2020.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-14-4253-2020 https://noa.gwlb.de/receive/cop_mods_00054810 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054461/tc-14-4253-2020.pdf https://tc.copernicus.org/articles/14/4253/2020/tc-14-4253-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-4253-2020 2024-06-26T04:43:09Z Supraglacial lakes and melt ponds occur in the ablation zones of Antarctica and Greenland during the summer months. Detection of lake extent, depth, and temporal evolution is important for understanding glacier dynamics. Previous remote sensing observations of lake depth are limited to estimates from passive satellite imagery, which has inherent uncertainties, and there is little ground truth available. In this study, we use laser altimetry data from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) over the Antarctic and Greenland ablation zones and the Airborne Topographic Mapper (ATM) for Hiawatha Glacier (Greenland) to demonstrate retrievals of supraglacial lake depth. Using an algorithm to separate lake surfaces and beds, we present case studies for 12 supraglacial lakes with the ATM lidar and 12 lakes with ICESat-2. Both lidars reliably detect bottom returns for lake beds as deep as 7 m. Lake bed uncertainties for these retrievals are 0.05–0.20 m for ATM and 0.12–0.80 m for ICESat-2, with the highest uncertainties observed for lakes deeper than 4 m. The bimodal nature of lake returns means that high-confidence photons are often insufficient to fully profile lakes, so lower confidence and buffer photons are required to view the lake bed. Despite challenges in automation, the altimeter results are promising, and we expect them to serve as a benchmark for future studies of surface meltwater depths. Article in Journal/Newspaper Airborne Topographic Mapper Antarc* Antarctic Antarctica glacier Greenland The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 14 11 4253 4263 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Fair, Zachary Flanner, Mark Brunt, Kelly M. Fricker, Helen Amanda Gardner, Alex Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
topic_facet |
article Verlagsveröffentlichung |
description |
Supraglacial lakes and melt ponds occur in the ablation zones of Antarctica and Greenland during the summer months. Detection of lake extent, depth, and temporal evolution is important for understanding glacier dynamics. Previous remote sensing observations of lake depth are limited to estimates from passive satellite imagery, which has inherent uncertainties, and there is little ground truth available. In this study, we use laser altimetry data from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) over the Antarctic and Greenland ablation zones and the Airborne Topographic Mapper (ATM) for Hiawatha Glacier (Greenland) to demonstrate retrievals of supraglacial lake depth. Using an algorithm to separate lake surfaces and beds, we present case studies for 12 supraglacial lakes with the ATM lidar and 12 lakes with ICESat-2. Both lidars reliably detect bottom returns for lake beds as deep as 7 m. Lake bed uncertainties for these retrievals are 0.05–0.20 m for ATM and 0.12–0.80 m for ICESat-2, with the highest uncertainties observed for lakes deeper than 4 m. The bimodal nature of lake returns means that high-confidence photons are often insufficient to fully profile lakes, so lower confidence and buffer photons are required to view the lake bed. Despite challenges in automation, the altimeter results are promising, and we expect them to serve as a benchmark for future studies of surface meltwater depths. |
format |
Article in Journal/Newspaper |
author |
Fair, Zachary Flanner, Mark Brunt, Kelly M. Fricker, Helen Amanda Gardner, Alex |
author_facet |
Fair, Zachary Flanner, Mark Brunt, Kelly M. Fricker, Helen Amanda Gardner, Alex |
author_sort |
Fair, Zachary |
title |
Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
title_short |
Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
title_full |
Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
title_fullStr |
Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
title_full_unstemmed |
Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals |
title_sort |
using icesat-2 and operation icebridge altimetry for supraglacial lake depth retrievals |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-4253-2020 https://noa.gwlb.de/receive/cop_mods_00054810 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054461/tc-14-4253-2020.pdf https://tc.copernicus.org/articles/14/4253/2020/tc-14-4253-2020.pdf |
genre |
Airborne Topographic Mapper Antarc* Antarctic Antarctica glacier Greenland The Cryosphere |
genre_facet |
Airborne Topographic Mapper Antarc* Antarctic Antarctica glacier Greenland 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-14-4253-2020 https://noa.gwlb.de/receive/cop_mods_00054810 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054461/tc-14-4253-2020.pdf https://tc.copernicus.org/articles/14/4253/2020/tc-14-4253-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-14-4253-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
11 |
container_start_page |
4253 |
op_container_end_page |
4263 |
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1810453552433201152 |