Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique
We analyze Landsat-7 imagery spanning a 13-year period (2000–2012) for the Jakobshavn Ablation Region (JAR) along the west coast of Greenland. In addition, we introduce a new semi-automated technique for the mapping of melt-lakes using FoveaPro image-processing software (plug-in to Adobe Photoshop™)...
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ftohiowesleyanun:oai:digitalcommons.owu.edu:geol_geog_pubs-1035 2023-05-15T16:28:07+02:00 Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique Rowley, Nathan A. Fegyveresi, John M. 2019-01-01T08:00:00Z https://digitalcommons.owu.edu/geol_geog_pubs/36 https://doi.org/10.1080/1088937X.2019.1578289 unknown Digital Commons @ OWU https://digitalcommons.owu.edu/geol_geog_pubs/36 https://doi.org/10.1080/1088937X.2019.1578289 Geology & Geography Faculty Work Geography Geology text 2019 ftohiowesleyanun https://doi.org/10.1080/1088937X.2019.1578289 2021-12-23T13:17:09Z We analyze Landsat-7 imagery spanning a 13-year period (2000–2012) for the Jakobshavn Ablation Region (JAR) along the west coast of Greenland. In addition, we introduce a new semi-automated technique for the mapping of melt-lakes using FoveaPro image-processing software (plug-in to Adobe Photoshop™), greatly simplifying the process, and resulting in more-precise spatial melt-lake statistics over existing manual methods. We found a total mean melt-lake area of 0.30 ± 0.12 km2 (±1σ), with maximum melt-lake area increasing at an average rate of 0.032 km2 d−1 across the study periods. Additionally, we note a yearly seasonal increase (∼1.8 m d−1) in the overall mean lake elevation (∼200 m per season) as well as an optimal elevation of the largest-area melt-lakes of ∼1320 ± 20 m (±1σ). We also found an increase in the maximum average melt-lake elevation (MAME) of ∼3.8 m a−1 (∼50 m). Based on data recorded at nearby automated weather stations, the mean seasonal temperature increased ∼1.6°C over the 13-year period at an average rate of 0.125°C a−1. Although temperature is a driver for meltwater production, we conclude that mechanisms related to the surface topography are more likely modulating the spatial pattern and characteristics of melt lakes in the ablation zone. Text Greenland Jakobshavn Digital Commons @ OWU (Ohio Wesleyan University) Greenland Polar Geography 42 2 89 108 |
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Open Polar |
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Digital Commons @ OWU (Ohio Wesleyan University) |
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ftohiowesleyanun |
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topic |
Geography Geology |
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Geography Geology Rowley, Nathan A. Fegyveresi, John M. Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
topic_facet |
Geography Geology |
description |
We analyze Landsat-7 imagery spanning a 13-year period (2000–2012) for the Jakobshavn Ablation Region (JAR) along the west coast of Greenland. In addition, we introduce a new semi-automated technique for the mapping of melt-lakes using FoveaPro image-processing software (plug-in to Adobe Photoshop™), greatly simplifying the process, and resulting in more-precise spatial melt-lake statistics over existing manual methods. We found a total mean melt-lake area of 0.30 ± 0.12 km2 (±1σ), with maximum melt-lake area increasing at an average rate of 0.032 km2 d−1 across the study periods. Additionally, we note a yearly seasonal increase (∼1.8 m d−1) in the overall mean lake elevation (∼200 m per season) as well as an optimal elevation of the largest-area melt-lakes of ∼1320 ± 20 m (±1σ). We also found an increase in the maximum average melt-lake elevation (MAME) of ∼3.8 m a−1 (∼50 m). Based on data recorded at nearby automated weather stations, the mean seasonal temperature increased ∼1.6°C over the 13-year period at an average rate of 0.125°C a−1. Although temperature is a driver for meltwater production, we conclude that mechanisms related to the surface topography are more likely modulating the spatial pattern and characteristics of melt lakes in the ablation zone. |
format |
Text |
author |
Rowley, Nathan A. Fegyveresi, John M. |
author_facet |
Rowley, Nathan A. Fegyveresi, John M. |
author_sort |
Rowley, Nathan A. |
title |
Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
title_short |
Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
title_full |
Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
title_fullStr |
Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
title_full_unstemmed |
Generating a Supraglacial Melt-Lake Inventory Near Jakobshavn, West Greenland, Using a New Semi-Automated Lake-Mapping Technique |
title_sort |
generating a supraglacial melt-lake inventory near jakobshavn, west greenland, using a new semi-automated lake-mapping technique |
publisher |
Digital Commons @ OWU |
publishDate |
2019 |
url |
https://digitalcommons.owu.edu/geol_geog_pubs/36 https://doi.org/10.1080/1088937X.2019.1578289 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Jakobshavn |
genre_facet |
Greenland Jakobshavn |
op_source |
Geology & Geography Faculty Work |
op_relation |
https://digitalcommons.owu.edu/geol_geog_pubs/36 https://doi.org/10.1080/1088937X.2019.1578289 |
op_doi |
https://doi.org/10.1080/1088937X.2019.1578289 |
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Polar Geography |
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42 |
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2 |
container_start_page |
89 |
op_container_end_page |
108 |
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