Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR
Supraglacial liquid water at the margins of ice sheets has an important impact on the surface energy balance and can also influence the ice flow when supraglacial lakes drain to the bed. Optical imagery is able to monitor supraglacial lakes during the summer season. Here we developed an alternative...
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ftawi:oai:epic.awi.de:53255 2024-09-15T18:09:26+00:00 Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR Schröder, Ludwig Neckel, Niklas Zindler, Robin Humbert, Angelika 2020 application/pdf https://epic.awi.de/id/eprint/53255/ https://epic.awi.de/id/eprint/53255/1/remotesensing-12-02798-v2.pdf https://www.mdpi.com/2072-4292/12/17/2798 https://hdl.handle.net/10013/epic.fdd55aae-81f7-48d7-beec-febaa3b9e8bc unknown https://epic.awi.de/id/eprint/53255/1/remotesensing-12-02798-v2.pdf Schröder, L. orcid:0000-0002-6862-0930 , Neckel, N. orcid:0000-0003-4300-5488 , Zindler, R. orcid:0000-0002-6955-0065 and Humbert, A. orcid:0000-0002-0244-8760 (2020) Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR , Remote Sensing, 12 (17) . doi:10.3390/rs12172798 <https://doi.org/10.3390/rs12172798> , hdl:10013/epic.fdd55aae-81f7-48d7-beec-febaa3b9e8bc EPIC3Remote Sensing, 12(17) Article isiRev info:eu-repo/semantics/article 2020 ftawi https://doi.org/10.3390/rs12172798 2024-06-24T04:26:11Z Supraglacial liquid water at the margins of ice sheets has an important impact on the surface energy balance and can also influence the ice flow when supraglacial lakes drain to the bed. Optical imagery is able to monitor supraglacial lakes during the summer season. Here we developed an alternative method using polarimetric SAR from Sentinel-1 during 2017-2020 to distinguish between liquid water and other surface types at the margin of the Northeast Greenland Ice Stream. This allows the supraglacial hydrology to be monitored during the winter months too. We found that the majority of supraglacial lakes persist over winter. When comparing our results to optical data, we found significantly more water. Even during summer, many lakes are partly or fully covered by a lid of ice and snow. We used our classification results to automatically map the outlines of supraglacial lakes, create time series of water area for each lake, and hence detect drainage events. We even found several winter time drainages, which might have an important effect on ice flow. Our method has problems during the peak of the melt season, but for the rest of the year it provides crucial information for better understanding the component of supraglacial hydrology in the glaciological system. Article in Journal/Newspaper Greenland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Remote Sensing 12 17 2798 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Supraglacial liquid water at the margins of ice sheets has an important impact on the surface energy balance and can also influence the ice flow when supraglacial lakes drain to the bed. Optical imagery is able to monitor supraglacial lakes during the summer season. Here we developed an alternative method using polarimetric SAR from Sentinel-1 during 2017-2020 to distinguish between liquid water and other surface types at the margin of the Northeast Greenland Ice Stream. This allows the supraglacial hydrology to be monitored during the winter months too. We found that the majority of supraglacial lakes persist over winter. When comparing our results to optical data, we found significantly more water. Even during summer, many lakes are partly or fully covered by a lid of ice and snow. We used our classification results to automatically map the outlines of supraglacial lakes, create time series of water area for each lake, and hence detect drainage events. We even found several winter time drainages, which might have an important effect on ice flow. Our method has problems during the peak of the melt season, but for the rest of the year it provides crucial information for better understanding the component of supraglacial hydrology in the glaciological system. |
format |
Article in Journal/Newspaper |
author |
Schröder, Ludwig Neckel, Niklas Zindler, Robin Humbert, Angelika |
spellingShingle |
Schröder, Ludwig Neckel, Niklas Zindler, Robin Humbert, Angelika Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
author_facet |
Schröder, Ludwig Neckel, Niklas Zindler, Robin Humbert, Angelika |
author_sort |
Schröder, Ludwig |
title |
Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
title_short |
Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
title_full |
Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
title_fullStr |
Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
title_full_unstemmed |
Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR |
title_sort |
perennial supraglacial lakes in northeast greenland observed by polarimetric sar |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/53255/ https://epic.awi.de/id/eprint/53255/1/remotesensing-12-02798-v2.pdf https://www.mdpi.com/2072-4292/12/17/2798 https://hdl.handle.net/10013/epic.fdd55aae-81f7-48d7-beec-febaa3b9e8bc |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
EPIC3Remote Sensing, 12(17) |
op_relation |
https://epic.awi.de/id/eprint/53255/1/remotesensing-12-02798-v2.pdf Schröder, L. orcid:0000-0002-6862-0930 , Neckel, N. orcid:0000-0003-4300-5488 , Zindler, R. orcid:0000-0002-6955-0065 and Humbert, A. orcid:0000-0002-0244-8760 (2020) Perennial Supraglacial Lakes in Northeast Greenland Observed by Polarimetric SAR , Remote Sensing, 12 (17) . doi:10.3390/rs12172798 <https://doi.org/10.3390/rs12172798> , hdl:10013/epic.fdd55aae-81f7-48d7-beec-febaa3b9e8bc |
op_doi |
https://doi.org/10.3390/rs12172798 |
container_title |
Remote Sensing |
container_volume |
12 |
container_issue |
17 |
container_start_page |
2798 |
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1810446992316301312 |