Seasonal evolution of supraglacial lake volume from aster imagery
Water stored in and released from supraglacial lakes is an important factor when considering the seasonal and long-term evolution of the Greenland ice sheet. Here we use a radiative transfer model to estimate changes in the depth and volume of a supraglacial lake on the surface of Jakobshavn Isbræ,...
Published in: | Annals of Glaciology |
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/128847/ https://doi.org/10.3189/172756409789624328 |
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ftulancaster:oai:eprints.lancs.ac.uk:128847 2023-08-27T04:04:04+02:00 Seasonal evolution of supraglacial lake volume from aster imagery Georgiou, S. Shepherd, A. Mcmillan, M. Nienow, P. 2009-10-23 https://eprints.lancs.ac.uk/id/eprint/128847/ https://doi.org/10.3189/172756409789624328 unknown Georgiou, S. and Shepherd, A. and Mcmillan, M. and Nienow, P. (2009) Seasonal evolution of supraglacial lake volume from aster imagery. Annals of Glaciology, 50 (52). pp. 95-100. ISSN 0260-3055 Journal Article PeerReviewed 2009 ftulancaster https://doi.org/10.3189/172756409789624328 2023-08-03T22:34:21Z Water stored in and released from supraglacial lakes is an important factor when considering the seasonal and long-term evolution of the Greenland ice sheet. Here we use a radiative transfer model to estimate changes in the depth and volume of a supraglacial lake on the surface of Jakobshavn Isbræ, West Greenland, between 2002 and 2005. When compared to estimates of the lake depth determined from airborne lidar observations, we estimate that the root-mean-square departure of the modelled lake depths was 0.3 m during cloud-free conditions. The maximum lake area, depth and volume were 3.4 km 2, 9.6 ± 1.0 m and (18.6 ± 3.7) × 106 m3, respectively. When sequenced according to the number of positive degree-days (PDDs) accumulated prior to each image, we observe that the lake volume evolves in three distinct phases. At the start of the melting season, the rate of filling is slow; after approximately 80 PDDs the rate of filling increases by a factor ∼3, and after approximately 125 PDDs the lake drains rapidly. We estimate that the lake drains at a minimum rate of (2.66 ± 0.53) × 106 m3 d-1 over a 6 day period. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet Jakobshavn Jakobshavn isbræ Lancaster University: Lancaster Eprints Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) Annals of Glaciology 50 52 95 100 |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
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unknown |
description |
Water stored in and released from supraglacial lakes is an important factor when considering the seasonal and long-term evolution of the Greenland ice sheet. Here we use a radiative transfer model to estimate changes in the depth and volume of a supraglacial lake on the surface of Jakobshavn Isbræ, West Greenland, between 2002 and 2005. When compared to estimates of the lake depth determined from airborne lidar observations, we estimate that the root-mean-square departure of the modelled lake depths was 0.3 m during cloud-free conditions. The maximum lake area, depth and volume were 3.4 km 2, 9.6 ± 1.0 m and (18.6 ± 3.7) × 106 m3, respectively. When sequenced according to the number of positive degree-days (PDDs) accumulated prior to each image, we observe that the lake volume evolves in three distinct phases. At the start of the melting season, the rate of filling is slow; after approximately 80 PDDs the rate of filling increases by a factor ∼3, and after approximately 125 PDDs the lake drains rapidly. We estimate that the lake drains at a minimum rate of (2.66 ± 0.53) × 106 m3 d-1 over a 6 day period. |
format |
Article in Journal/Newspaper |
author |
Georgiou, S. Shepherd, A. Mcmillan, M. Nienow, P. |
spellingShingle |
Georgiou, S. Shepherd, A. Mcmillan, M. Nienow, P. Seasonal evolution of supraglacial lake volume from aster imagery |
author_facet |
Georgiou, S. Shepherd, A. Mcmillan, M. Nienow, P. |
author_sort |
Georgiou, S. |
title |
Seasonal evolution of supraglacial lake volume from aster imagery |
title_short |
Seasonal evolution of supraglacial lake volume from aster imagery |
title_full |
Seasonal evolution of supraglacial lake volume from aster imagery |
title_fullStr |
Seasonal evolution of supraglacial lake volume from aster imagery |
title_full_unstemmed |
Seasonal evolution of supraglacial lake volume from aster imagery |
title_sort |
seasonal evolution of supraglacial lake volume from aster imagery |
publishDate |
2009 |
url |
https://eprints.lancs.ac.uk/id/eprint/128847/ https://doi.org/10.3189/172756409789624328 |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Greenland Jakobshavn Isbræ |
geographic_facet |
Greenland Jakobshavn Isbræ |
genre |
Annals of Glaciology Greenland Ice Sheet Jakobshavn Jakobshavn isbræ |
genre_facet |
Annals of Glaciology Greenland Ice Sheet Jakobshavn Jakobshavn isbræ |
op_relation |
Georgiou, S. and Shepherd, A. and Mcmillan, M. and Nienow, P. (2009) Seasonal evolution of supraglacial lake volume from aster imagery. Annals of Glaciology, 50 (52). pp. 95-100. ISSN 0260-3055 |
op_doi |
https://doi.org/10.3189/172756409789624328 |
container_title |
Annals of Glaciology |
container_volume |
50 |
container_issue |
52 |
container_start_page |
95 |
op_container_end_page |
100 |
_version_ |
1775349242010796032 |