Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland
<jats:title>ABSTRACT</jats:title><jats:p>Supraglacial lakes are known to trigger Antarctic ice-shelf instability and break-up. However, to date, no study has focused on lakes on Greenland's floating termini. Here, we apply lake boundary/area and depth algorithms to Landsat 8 i...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/275535 2024-01-14T10:00:11+01:00 Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland MacDonald, GJ Banwell, AF Macayeal, DR 2018 application/pdf https://www.repository.cam.ac.uk/handle/1810/275535 https://doi.org/10.17863/CAM.22771 eng eng Cambridge University Press (CUP) http://dx.doi.org/10.1017/aog.2018.9 Annals of Glaciology https://www.repository.cam.ac.uk/handle/1810/275535 doi:10.17863/CAM.22771 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ Arctic glaciology glacier hydrology ice-shelf break-up ice shelves Article 2018 ftunivcam https://doi.org/10.17863/CAM.22771 2023-12-21T23:23:09Z <jats:title>ABSTRACT</jats:title><jats:p>Supraglacial lakes are known to trigger Antarctic ice-shelf instability and break-up. However, to date, no study has focused on lakes on Greenland's floating termini. Here, we apply lake boundary/area and depth algorithms to Landsat 8 imagery to analyse the inter- and intraseasonal evolution of supraglacial lakes across Petermann Glacier's (81°N) floating tongue from 2014 to 2016, while also comparing these lakes to those on the grounded ice. Lakes start to fill in June and quickly peak in total number, volume and area in late June/early July in response to increases in air temperatures. However, through July and August, total lake number, volume and area all decline, despite sustained high temperatures. These observations may be explained by the transportation of meltwater into the ocean by a river, and by lake drainage events on the floating tongue. Further, as mean lake depth remains relatively constant during this time, we suggest that a large proportion of the lakes that drain, do so completely, likely by rapid hydrofracture. The mean areas of lakes on the tongue are only ~20% of those on the grounded ice and exhibit lower variability in maximum and mean depth, differences likely attributable to the contrasting formation processes of lakes in each environment.</jats:p> Article in Journal/Newspaper Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier Apollo - University of Cambridge Repository Antarctic Arctic Greenland Ice Lakes ENVELOPE(-131.345,-131.345,60.413,60.413) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
Arctic glaciology glacier hydrology ice-shelf break-up ice shelves |
spellingShingle |
Arctic glaciology glacier hydrology ice-shelf break-up ice shelves MacDonald, GJ Banwell, AF Macayeal, DR Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
topic_facet |
Arctic glaciology glacier hydrology ice-shelf break-up ice shelves |
description |
<jats:title>ABSTRACT</jats:title><jats:p>Supraglacial lakes are known to trigger Antarctic ice-shelf instability and break-up. However, to date, no study has focused on lakes on Greenland's floating termini. Here, we apply lake boundary/area and depth algorithms to Landsat 8 imagery to analyse the inter- and intraseasonal evolution of supraglacial lakes across Petermann Glacier's (81°N) floating tongue from 2014 to 2016, while also comparing these lakes to those on the grounded ice. Lakes start to fill in June and quickly peak in total number, volume and area in late June/early July in response to increases in air temperatures. However, through July and August, total lake number, volume and area all decline, despite sustained high temperatures. These observations may be explained by the transportation of meltwater into the ocean by a river, and by lake drainage events on the floating tongue. Further, as mean lake depth remains relatively constant during this time, we suggest that a large proportion of the lakes that drain, do so completely, likely by rapid hydrofracture. The mean areas of lakes on the tongue are only ~20% of those on the grounded ice and exhibit lower variability in maximum and mean depth, differences likely attributable to the contrasting formation processes of lakes in each environment.</jats:p> |
format |
Article in Journal/Newspaper |
author |
MacDonald, GJ Banwell, AF Macayeal, DR |
author_facet |
MacDonald, GJ Banwell, AF Macayeal, DR |
author_sort |
MacDonald, GJ |
title |
Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
title_short |
Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
title_full |
Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
title_fullStr |
Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
title_full_unstemmed |
Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland |
title_sort |
seasonal evolution of supraglacial lakes on a floating ice tongue, petermann glacier, greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
https://www.repository.cam.ac.uk/handle/1810/275535 https://doi.org/10.17863/CAM.22771 |
long_lat |
ENVELOPE(-131.345,-131.345,60.413,60.413) |
geographic |
Antarctic Arctic Greenland Ice Lakes |
geographic_facet |
Antarctic Arctic Greenland Ice Lakes |
genre |
Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier |
genre_facet |
Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/275535 doi:10.17863/CAM.22771 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.22771 |
_version_ |
1788063980796772352 |