Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming
ABSTRACT The inland advance of supraglacial lakes (SGLs) towards the interior regions of the Greenland ice sheet (GrIS) may have implications for the water volumes reaching the subglacial drainage system, and could consequently affect long-term ice-sheet dynamics. Here, we investigate changes to the...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/aog.2017.31 2024-09-15T17:39:52+00:00 Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming Gledhill, Laura A. Williamson, Andrew G. 2017 http://dx.doi.org/10.1017/aog.2017.31 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305517000313 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 59, issue 76pt1, page 66-82 ISSN 0260-3055 1727-5644 journal-article 2017 crcambridgeupr https://doi.org/10.1017/aog.2017.31 2024-07-24T04:01:31Z ABSTRACT The inland advance of supraglacial lakes (SGLs) towards the interior regions of the Greenland ice sheet (GrIS) may have implications for the water volumes reaching the subglacial drainage system, and could consequently affect long-term ice-sheet dynamics. Here, we investigate changes to the areas, volumes and elevation distributions of over 8000 manually delineated SGLs using 44 Landsat images of a 6200 km 2 sector of north-west Greenland over three decades (1985–2016). Our results show that SGLs have advanced to higher maximum (+418 m) and mean (+299 m) elevations, and that there has been a near-doubling of total regional SGL areas and volumes over the study period, accelerating after 2000. These changes were primarily caused by an increased SGL area and volume at high (≥1200 m a.s.l.) elevations, where SGL coverage increased by over 2750% during the study period. Many of the observed changes, particularly the post-2000 accelerations, were driven by changes to regional surface-temperature anomalies. This study demonstrates the past and accelerating response of the GrIS's hydrological system due to climatic warming, indicating an urgent need to understand whether the increasingly inland SGLs will be capable of hydrofracture in the future, thus determining their potential implications for ice-sheet dynamics. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet Cambridge University Press Annals of Glaciology 59 76pt1 66 82 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
ABSTRACT The inland advance of supraglacial lakes (SGLs) towards the interior regions of the Greenland ice sheet (GrIS) may have implications for the water volumes reaching the subglacial drainage system, and could consequently affect long-term ice-sheet dynamics. Here, we investigate changes to the areas, volumes and elevation distributions of over 8000 manually delineated SGLs using 44 Landsat images of a 6200 km 2 sector of north-west Greenland over three decades (1985–2016). Our results show that SGLs have advanced to higher maximum (+418 m) and mean (+299 m) elevations, and that there has been a near-doubling of total regional SGL areas and volumes over the study period, accelerating after 2000. These changes were primarily caused by an increased SGL area and volume at high (≥1200 m a.s.l.) elevations, where SGL coverage increased by over 2750% during the study period. Many of the observed changes, particularly the post-2000 accelerations, were driven by changes to regional surface-temperature anomalies. This study demonstrates the past and accelerating response of the GrIS's hydrological system due to climatic warming, indicating an urgent need to understand whether the increasingly inland SGLs will be capable of hydrofracture in the future, thus determining their potential implications for ice-sheet dynamics. |
format |
Article in Journal/Newspaper |
author |
Gledhill, Laura A. Williamson, Andrew G. |
spellingShingle |
Gledhill, Laura A. Williamson, Andrew G. Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
author_facet |
Gledhill, Laura A. Williamson, Andrew G. |
author_sort |
Gledhill, Laura A. |
title |
Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
title_short |
Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
title_full |
Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
title_fullStr |
Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
title_full_unstemmed |
Inland advance of supraglacial lakes in north-west Greenland under recent climatic warming |
title_sort |
inland advance of supraglacial lakes in north-west greenland under recent climatic warming |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/aog.2017.31 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305517000313 |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Annals of Glaciology volume 59, issue 76pt1, page 66-82 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2017.31 |
container_title |
Annals of Glaciology |
container_volume |
59 |
container_issue |
76pt1 |
container_start_page |
66 |
op_container_end_page |
82 |
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1810483130796081152 |