Hydrology and dynamics of a land-terminating Greenland outlet glacier
The purpose of this thesis is to investigate the hydrology and dynamics of a land-terminating outlet glacier on the western margin of the Greenland Ice Sheet (GrIS). The investigations are motivated by uncertainty about the effect of meltwater on rates of ice flow in the GrIS and the possibility tha...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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The University of Edinburgh
2012
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Online Access: | http://hdl.handle.net/1842/7613 |
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ftunivedinburgh:oai:era.ed.ac.uk:1842/7613 2023-07-30T04:02:09+02:00 Hydrology and dynamics of a land-terminating Greenland outlet glacier Bartholomew, Ian D. Nienow, Peter Hubbard, Alun Wadham, Jemma Natural Environment Research Council (NERC) 2012-11-29 application/pdf http://hdl.handle.net/1842/7613 en eng The University of Edinburgh Bartholomew, I., P. Nienow, D. Mair, A. Hubbard, M. King, and A. Sole (2010), Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier, Nature Geoscience, 3, 408--411. Bartholomew, I., P. Nienow, A. Sole, D. Mair, T. Cowton, S. Palmer, and J. Wadham (2011), Supraglacial forcing of subglacial hydrology in the ablation zone of the Greenland Ice Sheet, Geophysical Research Letters, 38, L08502, doi:10.1029/2011GL047063. Bartholomew, I., P. Nienow, A. Sole, D. Mair, T. Cowton, S. Palmer, and M. King (2011), Seasonal variations in Greenland Ice Sheet motion: inland extent and behaviour at higher elevations, Earth and Planetary Science Letters, 307, 271--278, doi:10.1016/j.epsl.2011.04.014. Sole, A., D. Mair, P. Nienow, I. Bartholomew, M. King, M. Burke, and I. Joughin (2011), Seasonal speed-up of a Greenland marine-terminating outlet glacier forced by surface melt-induced changes in subglacial hydrology, Journal of Geophysical Research, 116, F03014, doi:10.1029/2010JF001948. http://hdl.handle.net/1842/7613 Greenland glaciology hydrology Thesis or Dissertation Doctoral PhD Doctor of Philosophy 2012 ftunivedinburgh https://doi.org/10.1029/2011GL04706310.1016/j.epsl.2011.04.01410.1029/2010JF001948 2023-07-09T20:35:38Z The purpose of this thesis is to investigate the hydrology and dynamics of a land-terminating outlet glacier on the western margin of the Greenland Ice Sheet (GrIS). The investigations are motivated by uncertainty about the effect of meltwater on rates of ice flow in the GrIS and the possibility that hydrologically forced changes in ice velocity might increase mass loss from the ice sheet significantly in response to climate warming. The impact of meltwater on fluctuations in ice flow has been a research focus for glaciologists studying Alpine and Arctic glaciers for decades. In these settings, one of the main controls on the relationship between surface melting and ice velocity is the structure of the subglacial drainage system, which evolves spatially and temporally on a seasonal basis in response to inputs of meltwater from the glacier surface. In this thesis we present three years of field observations of glacier velocity, surface ablation and hydrology from a land-terminating glacier in west Greenland. These data are supplemented by satellite data and the use of simple models to constrain surface melting. We find that hydrologically forced ice acceleration occurs each year along a 115 km transect, first at sites nearest the ice sheet margin and at locations further inland following the onset of surface melting at higher elevations. At sites near the ice sheet margin, the relationship between surface melting and ice velocity is not consistent throughout the melt season, and ice velocity becomes less sensitive to inputs of meltwater later in the summer. This is explained by development in the efficiency of the subglacial drainage system, in a manner similar to Alpine glaciers. We perform a hydrological study which indicates that an efficient subglacial drainage system expands upglacier over the course of the melt season, in response to inputs of water from the ice sheet surface. At higher elevation sites, however, thicker ice and colder temperatures mean that it is harder to generate enough water to reach the ... Doctoral or Postdoctoral Thesis Arctic glacier Greenland Ice Sheet Edinburgh Research Archive (ERA - University of Edinburgh) Arctic Greenland Geophysical Research Letters 38 8 n/a n/a |
institution |
Open Polar |
collection |
Edinburgh Research Archive (ERA - University of Edinburgh) |
op_collection_id |
ftunivedinburgh |
language |
English |
topic |
Greenland glaciology hydrology |
spellingShingle |
Greenland glaciology hydrology Bartholomew, Ian D. Hydrology and dynamics of a land-terminating Greenland outlet glacier |
topic_facet |
Greenland glaciology hydrology |
description |
The purpose of this thesis is to investigate the hydrology and dynamics of a land-terminating outlet glacier on the western margin of the Greenland Ice Sheet (GrIS). The investigations are motivated by uncertainty about the effect of meltwater on rates of ice flow in the GrIS and the possibility that hydrologically forced changes in ice velocity might increase mass loss from the ice sheet significantly in response to climate warming. The impact of meltwater on fluctuations in ice flow has been a research focus for glaciologists studying Alpine and Arctic glaciers for decades. In these settings, one of the main controls on the relationship between surface melting and ice velocity is the structure of the subglacial drainage system, which evolves spatially and temporally on a seasonal basis in response to inputs of meltwater from the glacier surface. In this thesis we present three years of field observations of glacier velocity, surface ablation and hydrology from a land-terminating glacier in west Greenland. These data are supplemented by satellite data and the use of simple models to constrain surface melting. We find that hydrologically forced ice acceleration occurs each year along a 115 km transect, first at sites nearest the ice sheet margin and at locations further inland following the onset of surface melting at higher elevations. At sites near the ice sheet margin, the relationship between surface melting and ice velocity is not consistent throughout the melt season, and ice velocity becomes less sensitive to inputs of meltwater later in the summer. This is explained by development in the efficiency of the subglacial drainage system, in a manner similar to Alpine glaciers. We perform a hydrological study which indicates that an efficient subglacial drainage system expands upglacier over the course of the melt season, in response to inputs of water from the ice sheet surface. At higher elevation sites, however, thicker ice and colder temperatures mean that it is harder to generate enough water to reach the ... |
author2 |
Nienow, Peter Hubbard, Alun Wadham, Jemma Natural Environment Research Council (NERC) |
format |
Doctoral or Postdoctoral Thesis |
author |
Bartholomew, Ian D. |
author_facet |
Bartholomew, Ian D. |
author_sort |
Bartholomew, Ian D. |
title |
Hydrology and dynamics of a land-terminating Greenland outlet glacier |
title_short |
Hydrology and dynamics of a land-terminating Greenland outlet glacier |
title_full |
Hydrology and dynamics of a land-terminating Greenland outlet glacier |
title_fullStr |
Hydrology and dynamics of a land-terminating Greenland outlet glacier |
title_full_unstemmed |
Hydrology and dynamics of a land-terminating Greenland outlet glacier |
title_sort |
hydrology and dynamics of a land-terminating greenland outlet glacier |
publisher |
The University of Edinburgh |
publishDate |
2012 |
url |
http://hdl.handle.net/1842/7613 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic glacier Greenland Ice Sheet |
genre_facet |
Arctic glacier Greenland Ice Sheet |
op_relation |
Bartholomew, I., P. Nienow, D. Mair, A. Hubbard, M. King, and A. Sole (2010), Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier, Nature Geoscience, 3, 408--411. Bartholomew, I., P. Nienow, A. Sole, D. Mair, T. Cowton, S. Palmer, and J. Wadham (2011), Supraglacial forcing of subglacial hydrology in the ablation zone of the Greenland Ice Sheet, Geophysical Research Letters, 38, L08502, doi:10.1029/2011GL047063. Bartholomew, I., P. Nienow, A. Sole, D. Mair, T. Cowton, S. Palmer, and M. King (2011), Seasonal variations in Greenland Ice Sheet motion: inland extent and behaviour at higher elevations, Earth and Planetary Science Letters, 307, 271--278, doi:10.1016/j.epsl.2011.04.014. Sole, A., D. Mair, P. Nienow, I. Bartholomew, M. King, M. Burke, and I. Joughin (2011), Seasonal speed-up of a Greenland marine-terminating outlet glacier forced by surface melt-induced changes in subglacial hydrology, Journal of Geophysical Research, 116, F03014, doi:10.1029/2010JF001948. http://hdl.handle.net/1842/7613 |
op_doi |
https://doi.org/10.1029/2011GL04706310.1016/j.epsl.2011.04.01410.1029/2010JF001948 |
container_title |
Geophysical Research Letters |
container_volume |
38 |
container_issue |
8 |
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n/a |
op_container_end_page |
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1772812869148082176 |