Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland
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...
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Cambridge University Press
2018
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ftdoajarticles:oai:doaj.org/article:e94adc89fe1d4faaad7226e2cb6f3a75 2023-05-15T13:29:33+02:00 Seasonal evolution of supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland Grant J. Macdonald Alison F. Banwell Douglas R. MacAyeal 2018-07-01T00:00:00Z https://doi.org/10.1017/aog.2018.9 https://doaj.org/article/e94adc89fe1d4faaad7226e2cb6f3a75 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305518000095/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.9 0260-3055 1727-5644 https://doaj.org/article/e94adc89fe1d4faaad7226e2cb6f3a75 Annals of Glaciology, Vol 59, Pp 56-65 (2018) Arctic glaciology glacier hydrology ice-shelf break-up ice shelves Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1017/aog.2018.9 2023-03-12T01:31:57Z 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. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Greenland Ice Lakes ENVELOPE(-131.345,-131.345,60.413,60.413) Annals of Glaciology 59 76pt1 56 65 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic glaciology glacier hydrology ice-shelf break-up ice shelves Meteorology. Climatology QC851-999 |
spellingShingle |
Arctic glaciology glacier hydrology ice-shelf break-up ice shelves Meteorology. Climatology QC851-999 Grant J. Macdonald Alison F. Banwell Douglas R. MacAyeal 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 Meteorology. Climatology QC851-999 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Grant J. Macdonald Alison F. Banwell Douglas R. MacAyeal |
author_facet |
Grant J. Macdonald Alison F. Banwell Douglas R. MacAyeal |
author_sort |
Grant J. Macdonald |
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 |
publishDate |
2018 |
url |
https://doi.org/10.1017/aog.2018.9 https://doaj.org/article/e94adc89fe1d4faaad7226e2cb6f3a75 |
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 |
Annals of Glaciology Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier |
genre_facet |
Annals of Glaciology Antarc* Antarctic Arctic glacier Greenland Ice Shelf Ice Shelves Petermann glacier |
op_source |
Annals of Glaciology, Vol 59, Pp 56-65 (2018) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305518000095/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.9 0260-3055 1727-5644 https://doaj.org/article/e94adc89fe1d4faaad7226e2cb6f3a75 |
op_doi |
https://doi.org/10.1017/aog.2018.9 |
container_title |
Annals of Glaciology |
container_volume |
59 |
container_issue |
76pt1 |
container_start_page |
56 |
op_container_end_page |
65 |
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1766001166286585856 |