Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics
Abstract The outline and trend of 6566 subglacial bedforms in the New York Drumlin Field have been digitized from digital elevation data. A spatial predictive model has been used to extend values of bedform elongation over an area measuring 200 km × 110 km. The resulting surface is used in conjuncti...
Published in: | Earth Surface Processes and Landforms |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2009
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/esp.1803 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1803 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1803 |
id |
crwiley:10.1002/esp.1803 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/esp.1803 2024-06-02T08:08:15+00:00 Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics Hess, Dale P. Briner, Jason P. 2009 http://dx.doi.org/10.1002/esp.1803 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1803 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1803 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 34, issue 8, page 1126-1135 ISSN 0197-9337 1096-9837 journal-article 2009 crwiley https://doi.org/10.1002/esp.1803 2024-05-03T11:37:01Z Abstract The outline and trend of 6566 subglacial bedforms in the New York Drumlin Field have been digitized from digital elevation data. A spatial predictive model has been used to extend values of bedform elongation over an area measuring 200 km × 110 km. The resulting surface is used in conjunction with depth‐to‐bedrock data and an assumed duration of ice residence to test three proposed controls on bedform elongation. Upon comparison, the resulting display of morphometry is best explained by differences in ice velocity across the field of study. The existence of multiple zones of fast‐moving ice located along the southern margin of the Laurentide Ice Sheet is implied by the observed patterns of bedform elongation and orientation. We present two interpretations that are consistent with the observations. First, enhanced basal sliding caused by decreasing effective pressure near a calving margin is suggested as a possible mechanism by which localized fast ice flow is initiated and maintained. Second, topographically controlled ice streams likely occupied the fjord‐like troughs of the Appalachian Upland northern rim. Contrary to previous understanding of the Laurentide southern margin in New York State, the resulting palaeoglaciological reconstruction illustrates a dynamic mosaic of ice stream and/or outlet glacier activity. Copyright © 2009 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice Sheet Wiley Online Library Earth Surface Processes and Landforms 34 8 1126 1135 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The outline and trend of 6566 subglacial bedforms in the New York Drumlin Field have been digitized from digital elevation data. A spatial predictive model has been used to extend values of bedform elongation over an area measuring 200 km × 110 km. The resulting surface is used in conjunction with depth‐to‐bedrock data and an assumed duration of ice residence to test three proposed controls on bedform elongation. Upon comparison, the resulting display of morphometry is best explained by differences in ice velocity across the field of study. The existence of multiple zones of fast‐moving ice located along the southern margin of the Laurentide Ice Sheet is implied by the observed patterns of bedform elongation and orientation. We present two interpretations that are consistent with the observations. First, enhanced basal sliding caused by decreasing effective pressure near a calving margin is suggested as a possible mechanism by which localized fast ice flow is initiated and maintained. Second, topographically controlled ice streams likely occupied the fjord‐like troughs of the Appalachian Upland northern rim. Contrary to previous understanding of the Laurentide southern margin in New York State, the resulting palaeoglaciological reconstruction illustrates a dynamic mosaic of ice stream and/or outlet glacier activity. Copyright © 2009 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Hess, Dale P. Briner, Jason P. |
spellingShingle |
Hess, Dale P. Briner, Jason P. Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
author_facet |
Hess, Dale P. Briner, Jason P. |
author_sort |
Hess, Dale P. |
title |
Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
title_short |
Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
title_full |
Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
title_fullStr |
Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
title_full_unstemmed |
Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field – implications for Laurentide Ice Sheet dynamics |
title_sort |
geospatial analysis of controls on subglacial bedform morphometry in the new york drumlin field – implications for laurentide ice sheet dynamics |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/esp.1803 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1803 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1803 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth Surface Processes and Landforms volume 34, issue 8, page 1126-1135 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.1803 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
34 |
container_issue |
8 |
container_start_page |
1126 |
op_container_end_page |
1135 |
_version_ |
1800753449332113408 |