A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet
Supraglacial lakes (SGLs) affect the dynamics of the Greenland ice sheet by storing runoff and draining episodically. We investigate the evolution of SGLs as reported in three datasets, each based on automated classification of satellite imagery. Although the datasets span the period 2001–10, there...
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ftchalmersuniv:oai:research.chalmers.se:193227 2023-05-15T16:28:00+02:00 A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet Leeson, Amber A. Shepherd, Andrew Sundal, Aud V. Johansson, Malin Selmes, Nick Briggs, Kate Hogg, Anna E. Fettweis, Xavier 2013 text https://doi.org/10.3189/2013JoG13J064 https://research.chalmers.se/en/publication/193227 unknown http://dx.doi.org/10.3189/2013JoG13J064 https://research.chalmers.se/en/publication/193227 Physical Geography 2013 ftchalmersuniv https://doi.org/10.3189/2013JoG13J064 2022-12-11T06:55:12Z Supraglacial lakes (SGLs) affect the dynamics of the Greenland ice sheet by storing runoff and draining episodically. We investigate the evolution of SGLs as reported in three datasets, each based on automated classification of satellite imagery. Although the datasets span the period 2001–10, there are differences in temporal sampling, and only the years 2005–07 are common. By subsampling the most populous dataset, we recommend a sampling frequency of one image per 6.5 days in order to minimize uncertainty associated with poor temporal sampling. When compared with manual classification ofsatellite imagery, all three datasets are found to omit a sizeable (29, 48 and 41%) fraction of lakes and are estimated to document the average size of SGLs to within 0.78, 0.48 and 0.95km2. We combine the datasets using a hierarchical scheme, producing a single, optimized, dataset. This combined record reports up to 67% more lakes than a single dataset. During 2005–07, the rate of SGL growth tends to follow the rate at which runoff increases in each year. In 2007, lakes drain earlier than in 2005 and 2006 and remain absent despite continued runoff. This suggests that lakes continue to act as open surface–bedconduits following drainage. Other/Unknown Material Greenland Ice Sheet Chalmers University of Technology: Chalmers research Greenland Journal of Glaciology 59 218 1179 1188 |
institution |
Open Polar |
collection |
Chalmers University of Technology: Chalmers research |
op_collection_id |
ftchalmersuniv |
language |
unknown |
topic |
Physical Geography |
spellingShingle |
Physical Geography Leeson, Amber A. Shepherd, Andrew Sundal, Aud V. Johansson, Malin Selmes, Nick Briggs, Kate Hogg, Anna E. Fettweis, Xavier A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
topic_facet |
Physical Geography |
description |
Supraglacial lakes (SGLs) affect the dynamics of the Greenland ice sheet by storing runoff and draining episodically. We investigate the evolution of SGLs as reported in three datasets, each based on automated classification of satellite imagery. Although the datasets span the period 2001–10, there are differences in temporal sampling, and only the years 2005–07 are common. By subsampling the most populous dataset, we recommend a sampling frequency of one image per 6.5 days in order to minimize uncertainty associated with poor temporal sampling. When compared with manual classification ofsatellite imagery, all three datasets are found to omit a sizeable (29, 48 and 41%) fraction of lakes and are estimated to document the average size of SGLs to within 0.78, 0.48 and 0.95km2. We combine the datasets using a hierarchical scheme, producing a single, optimized, dataset. This combined record reports up to 67% more lakes than a single dataset. During 2005–07, the rate of SGL growth tends to follow the rate at which runoff increases in each year. In 2007, lakes drain earlier than in 2005 and 2006 and remain absent despite continued runoff. This suggests that lakes continue to act as open surface–bedconduits following drainage. |
author |
Leeson, Amber A. Shepherd, Andrew Sundal, Aud V. Johansson, Malin Selmes, Nick Briggs, Kate Hogg, Anna E. Fettweis, Xavier |
author_facet |
Leeson, Amber A. Shepherd, Andrew Sundal, Aud V. Johansson, Malin Selmes, Nick Briggs, Kate Hogg, Anna E. Fettweis, Xavier |
author_sort |
Leeson, Amber A. |
title |
A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
title_short |
A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
title_full |
A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
title_fullStr |
A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
title_full_unstemmed |
A comparison of supraglacial lake observations derived from MODIS imagery at the western margin of the Greenland ice sheet |
title_sort |
comparison of supraglacial lake observations derived from modis imagery at the western margin of the greenland ice sheet |
publishDate |
2013 |
url |
https://doi.org/10.3189/2013JoG13J064 https://research.chalmers.se/en/publication/193227 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
http://dx.doi.org/10.3189/2013JoG13J064 https://research.chalmers.se/en/publication/193227 |
op_doi |
https://doi.org/10.3189/2013JoG13J064 |
container_title |
Journal of Glaciology |
container_volume |
59 |
container_issue |
218 |
container_start_page |
1179 |
op_container_end_page |
1188 |
_version_ |
1766017603913908224 |