Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models
Abstract Digital elevation models (DEMs) of the bed and surface of the polythermal Midre Lovénbreen, Svalbard, are used to identify changes in glacier geometry between 1977 and 1995. The calculated mean annual mass balance (−0·61 m water equivalent (w.e.) a −1 ) is more negative than that derived fr...
Published in: | Earth Surface Processes and Landforms |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2003
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/esp.485 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.485 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.485 |
id |
crwiley:10.1002/esp.485 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/esp.485 2024-06-02T08:07:07+00:00 Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models Rippin, David Willis, Ian Arnold, Neil Hodson, Andrew Moore, John Kohler, Jack BjöRnsson, Helgi NERC St John's College, Cambridge The Dudley Stamp Memorial Fund (The Royal Society) The Philip Lake Fund (Department of Geography, University of Cambridge) The B.B. Roberts Fund (Scott Polar Research Institute, University of Cambridge) The Tennant Fund (Department of Anglo-Saxon, Norse and Celtic, University of Cambridge) The Worts Travelling Scholars Fund Nuffield Foundation 2003 http://dx.doi.org/10.1002/esp.485 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.485 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.485 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 28, issue 3, page 273-298 ISSN 0197-9337 1096-9837 journal-article 2003 crwiley https://doi.org/10.1002/esp.485 2024-05-03T12:03:26Z Abstract Digital elevation models (DEMs) of the bed and surface of the polythermal Midre Lovénbreen, Svalbard, are used to identify changes in glacier geometry between 1977 and 1995. The calculated mean annual mass balance (−0·61 m water equivalent (w.e.) a −1 ) is more negative than that derived from field measurements (−0·35 m w.e. a −1 ), although the error associated with this value (±0·7 m a −1 ) suggests that the difference may be accounted for by errors. However, similar discrepancies between DEM‐based and field‐based measurements of mass balance have been reported elsewhere in Svalbard. Although errors may be responsible, patterns of surface elevation change may also be explained in terms of patterns of ablation, accumulation, and dynamics. The theoretical structure of the subglacial drainage system is modelled using different assumptions about subglacial water pressure, in 1977 and 1995. These reconstructions are compared with the observed positions of proglacial outlet streams. Decreasing subglacial water pressure results in a decrease in the influence of surface morphology and an increase in the role of the bed topography on drainage routing, which generally leads to more dispersed drainage. Long‐term changes in the position of proglacial outlet streams occur as a result of changes in glacier geometry, but short‐term changes may also occur in response to early season water pressures, controlled by meteorological and hydrological conditions. Copyright © 2003 John Wiley & Sons, Ltd. Article in Journal/Newspaper glacier Svalbard Wiley Online Library Svalbard Earth Surface Processes and Landforms 28 3 273 298 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Digital elevation models (DEMs) of the bed and surface of the polythermal Midre Lovénbreen, Svalbard, are used to identify changes in glacier geometry between 1977 and 1995. The calculated mean annual mass balance (−0·61 m water equivalent (w.e.) a −1 ) is more negative than that derived from field measurements (−0·35 m w.e. a −1 ), although the error associated with this value (±0·7 m a −1 ) suggests that the difference may be accounted for by errors. However, similar discrepancies between DEM‐based and field‐based measurements of mass balance have been reported elsewhere in Svalbard. Although errors may be responsible, patterns of surface elevation change may also be explained in terms of patterns of ablation, accumulation, and dynamics. The theoretical structure of the subglacial drainage system is modelled using different assumptions about subglacial water pressure, in 1977 and 1995. These reconstructions are compared with the observed positions of proglacial outlet streams. Decreasing subglacial water pressure results in a decrease in the influence of surface morphology and an increase in the role of the bed topography on drainage routing, which generally leads to more dispersed drainage. Long‐term changes in the position of proglacial outlet streams occur as a result of changes in glacier geometry, but short‐term changes may also occur in response to early season water pressures, controlled by meteorological and hydrological conditions. Copyright © 2003 John Wiley & Sons, Ltd. |
author2 |
NERC St John's College, Cambridge The Dudley Stamp Memorial Fund (The Royal Society) The Philip Lake Fund (Department of Geography, University of Cambridge) The B.B. Roberts Fund (Scott Polar Research Institute, University of Cambridge) The Tennant Fund (Department of Anglo-Saxon, Norse and Celtic, University of Cambridge) The Worts Travelling Scholars Fund Nuffield Foundation |
format |
Article in Journal/Newspaper |
author |
Rippin, David Willis, Ian Arnold, Neil Hodson, Andrew Moore, John Kohler, Jack BjöRnsson, Helgi |
spellingShingle |
Rippin, David Willis, Ian Arnold, Neil Hodson, Andrew Moore, John Kohler, Jack BjöRnsson, Helgi Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
author_facet |
Rippin, David Willis, Ian Arnold, Neil Hodson, Andrew Moore, John Kohler, Jack BjöRnsson, Helgi |
author_sort |
Rippin, David |
title |
Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
title_short |
Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
title_full |
Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
title_fullStr |
Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
title_full_unstemmed |
Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models |
title_sort |
changes in geometry and subglacial drainage of midre lovénbreen, svalbard, determined from digital elevation models |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1002/esp.485 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.485 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.485 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_source |
Earth Surface Processes and Landforms volume 28, issue 3, page 273-298 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.485 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
28 |
container_issue |
3 |
container_start_page |
273 |
op_container_end_page |
298 |
_version_ |
1800752127709020160 |