Flow dynamics of Byrd Glacier, East Antarctica
Force-balance calculations on Byrd Glacier, East Antarctica, reveal large spatial variations in the along-flow component of driving stress with corresponding sticky spots that are stationary over time. On the large scale, flow resistance is partitioned between basal (�80%) and lateral (�20%) drag. I...
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ftunivmontana:oai:scholarworks.umt.edu:cs_pubs-1028 2023-07-16T03:52:30+02:00 Flow dynamics of Byrd Glacier, East Antarctica Van Der Veen, C. J. Stearns, L. A. Johnson, Jesse Csatho, B. 2014-12-01T08:00:00Z application/pdf https://scholarworks.umt.edu/cs_pubs/30 https://doi.org/10.3189/2014JoG14J052 https://scholarworks.umt.edu/context/cs_pubs/article/1028/viewcontent/Flow.pdf unknown ScholarWorks at University of Montana https://scholarworks.umt.edu/cs_pubs/30 doi:10.3189/2014JoG14J052 https://scholarworks.umt.edu/context/cs_pubs/article/1028/viewcontent/Flow.pdf © 2014 International Glaciological Society Computer Science Faculty Publications Antarctic glaciology glacier flow ice dynamics Computer Sciences text 2014 ftunivmontana https://doi.org/10.3189/2014JoG14J052 2023-06-27T22:10:57Z Force-balance calculations on Byrd Glacier, East Antarctica, reveal large spatial variations in the along-flow component of driving stress with corresponding sticky spots that are stationary over time. On the large scale, flow resistance is partitioned between basal (�80%) and lateral (�20%) drag. Ice flow is due mostly to basal sliding and concentrated vertical shear in the basal ice layers, indicating the bed is at or close to the pressure-melting temperature. There is a significant component of driving stress in the across-flow direction resulting in nonzero basal drag in that direction. This is an unrealistic result and we propose that there are spatial variations of bed features resulting in small-scale flow disturbances. The grounding line of Byrd Glacier is located in a region where the bed slopes upward. Nevertheless, despite a 10% increase in ice discharge between December 2005 and February 2007, following drainage of two subglacial lakes in the catchment area, the position of the grounding line has not retreated significantly and the glacier has decelerated since then. During the speed-up event, partitioning of flow resistance did not change, suggesting the increase in velocity was caused by a temporary decrease in basal effective pressure. Text Antarc* Antarctic Antarctica Byrd Glacier East Antarctica University of Montana: ScholarWorks Antarctic Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) East Antarctica Journal of Glaciology 60 224 1053 1064 |
institution |
Open Polar |
collection |
University of Montana: ScholarWorks |
op_collection_id |
ftunivmontana |
language |
unknown |
topic |
Antarctic glaciology glacier flow ice dynamics Computer Sciences |
spellingShingle |
Antarctic glaciology glacier flow ice dynamics Computer Sciences Van Der Veen, C. J. Stearns, L. A. Johnson, Jesse Csatho, B. Flow dynamics of Byrd Glacier, East Antarctica |
topic_facet |
Antarctic glaciology glacier flow ice dynamics Computer Sciences |
description |
Force-balance calculations on Byrd Glacier, East Antarctica, reveal large spatial variations in the along-flow component of driving stress with corresponding sticky spots that are stationary over time. On the large scale, flow resistance is partitioned between basal (�80%) and lateral (�20%) drag. Ice flow is due mostly to basal sliding and concentrated vertical shear in the basal ice layers, indicating the bed is at or close to the pressure-melting temperature. There is a significant component of driving stress in the across-flow direction resulting in nonzero basal drag in that direction. This is an unrealistic result and we propose that there are spatial variations of bed features resulting in small-scale flow disturbances. The grounding line of Byrd Glacier is located in a region where the bed slopes upward. Nevertheless, despite a 10% increase in ice discharge between December 2005 and February 2007, following drainage of two subglacial lakes in the catchment area, the position of the grounding line has not retreated significantly and the glacier has decelerated since then. During the speed-up event, partitioning of flow resistance did not change, suggesting the increase in velocity was caused by a temporary decrease in basal effective pressure. |
format |
Text |
author |
Van Der Veen, C. J. Stearns, L. A. Johnson, Jesse Csatho, B. |
author_facet |
Van Der Veen, C. J. Stearns, L. A. Johnson, Jesse Csatho, B. |
author_sort |
Van Der Veen, C. J. |
title |
Flow dynamics of Byrd Glacier, East Antarctica |
title_short |
Flow dynamics of Byrd Glacier, East Antarctica |
title_full |
Flow dynamics of Byrd Glacier, East Antarctica |
title_fullStr |
Flow dynamics of Byrd Glacier, East Antarctica |
title_full_unstemmed |
Flow dynamics of Byrd Glacier, East Antarctica |
title_sort |
flow dynamics of byrd glacier, east antarctica |
publisher |
ScholarWorks at University of Montana |
publishDate |
2014 |
url |
https://scholarworks.umt.edu/cs_pubs/30 https://doi.org/10.3189/2014JoG14J052 https://scholarworks.umt.edu/context/cs_pubs/article/1028/viewcontent/Flow.pdf |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) |
geographic |
Antarctic Byrd Byrd Glacier East Antarctica |
geographic_facet |
Antarctic Byrd Byrd Glacier East Antarctica |
genre |
Antarc* Antarctic Antarctica Byrd Glacier East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Byrd Glacier East Antarctica |
op_source |
Computer Science Faculty Publications |
op_relation |
https://scholarworks.umt.edu/cs_pubs/30 doi:10.3189/2014JoG14J052 https://scholarworks.umt.edu/context/cs_pubs/article/1028/viewcontent/Flow.pdf |
op_rights |
© 2014 International Glaciological Society |
op_doi |
https://doi.org/10.3189/2014JoG14J052 |
container_title |
Journal of Glaciology |
container_volume |
60 |
container_issue |
224 |
container_start_page |
1053 |
op_container_end_page |
1064 |
_version_ |
1771545913883361280 |