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Remote sensing of supraglacial lakes on the Greenland Ice Sheet. / Nick Selmes

Swansea University Author: Nick Selmes

Abstract

The dynamic mass loss from the Greenland Ice Sheet has prompted considerable research into the role of supraglacial lakes in causing dynamic thinning. These lakes can drain through 1000 m of ice to the bed and are thought to play an important role in connecting the surface and basal hydrologies of t...

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Published: 2011
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42597
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last_indexed 2018-08-03T10:10:34Z
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spelling 2018-08-02T16:24:29.7901969 v2 42597 2018-08-02 Remote sensing of supraglacial lakes on the Greenland Ice Sheet. 0a76b257ed0f2771af64fe64e5810e1e NULL Nick Selmes Nick Selmes true true 2018-08-02 The dynamic mass loss from the Greenland Ice Sheet has prompted considerable research into the role of supraglacial lakes in causing dynamic thinning. These lakes can drain through 1000 m of ice to the bed and are thought to play an important role in connecting the surface and basal hydrologies of the ice sheet, allowing water to reach the bed and cause the ice to accelerate. Despite this apparent importance little research has been carried out on lakes outside of SVV Greenland, and no research has examined the occurrence of lake drainage over the whole of Greenland. The aim of this thesis is to discover where lakes occur for the entire Greenland ice Sheet, and how these lakes drain. New remote sensing techniques for monitoring lakes through the melt season were developed and tested. The evolution of 2600 lakes (those lakes larger than > 0.125 km2) was studied over five years (2005-2009) using 3704 MODIS images. Lakes were discovered to either drain fast to the bed, more slowly over the surface, or to freeze at the end of the melt season. There were 263 fast lake drainages per year of which 61% were in the SW region and a further 17% in the NE, both regions where mass loss is mainly due to surface mass balance. In the dynamically thinning SE region there were only three fast lake drainages per year along a 1300 km coastline. In the NW, fast lake drainage did not occur on five of the ten glaciers with the most rapid dynamic thinning. The results of this thesis show that the drainage of supraglacial lakes cannot have been responsible for dynamic mass loss from the Greenland Ice Sheet. E-Thesis Remote sensing.;Geographic information science and geodesy.;Geomorphology. 31 12 2011 2011-12-31 COLLEGE NANME Geography COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.7901969 2018-08-02T16:24:29.7901969 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Nick Selmes NULL 1 0042597-02082018162506.pdf 10805355.pdf 2018-08-02T16:25:06.9970000 Output 25250353 application/pdf E-Thesis true 2018-08-02T16:25:06.9970000 false
title Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
spellingShingle Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
Nick Selmes
title_short Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
title_full Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
title_fullStr Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
title_full_unstemmed Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
title_sort Remote sensing of supraglacial lakes on the Greenland Ice Sheet.
author_id_str_mv 0a76b257ed0f2771af64fe64e5810e1e
author_id_fullname_str_mv 0a76b257ed0f2771af64fe64e5810e1e_***_Nick Selmes
author Nick Selmes
author2 Nick Selmes
format E-Thesis
publishDate 2011
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description The dynamic mass loss from the Greenland Ice Sheet has prompted considerable research into the role of supraglacial lakes in causing dynamic thinning. These lakes can drain through 1000 m of ice to the bed and are thought to play an important role in connecting the surface and basal hydrologies of the ice sheet, allowing water to reach the bed and cause the ice to accelerate. Despite this apparent importance little research has been carried out on lakes outside of SVV Greenland, and no research has examined the occurrence of lake drainage over the whole of Greenland. The aim of this thesis is to discover where lakes occur for the entire Greenland ice Sheet, and how these lakes drain. New remote sensing techniques for monitoring lakes through the melt season were developed and tested. The evolution of 2600 lakes (those lakes larger than > 0.125 km2) was studied over five years (2005-2009) using 3704 MODIS images. Lakes were discovered to either drain fast to the bed, more slowly over the surface, or to freeze at the end of the melt season. There were 263 fast lake drainages per year of which 61% were in the SW region and a further 17% in the NE, both regions where mass loss is mainly due to surface mass balance. In the dynamically thinning SE region there were only three fast lake drainages per year along a 1300 km coastline. In the NW, fast lake drainage did not occur on five of the ten glaciers with the most rapid dynamic thinning. The results of this thesis show that the drainage of supraglacial lakes cannot have been responsible for dynamic mass loss from the Greenland Ice Sheet.
published_date 2011-12-31T03:53:16Z
_version_ 1763752643853811712
score 11.037144

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