Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska
ABSTRACT Glacier basal motion generates diurnal to multi-annual fluctuations in glacier velocity and mass flux. Understanding these fluctuations is important for prediction of future sea-level rise and for gaining insight into glacier physics and erosion. Here, we derive glacier velocity through cro...
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Online Access: | http://dx.doi.org/10.1017/jog.2016.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016000666 |
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crcambridgeupr:10.1017/jog.2016.66 2024-03-03T08:44:33+00:00 Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska ARMSTRONG, W. H. ANDERSON, R. S. ALLEN, JEFFERY RAJARAM, H. 2016 http://dx.doi.org/10.1017/jog.2016.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016000666 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 62, issue 234, page 763-777 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2016 crcambridgeupr https://doi.org/10.1017/jog.2016.66 2024-02-08T08:31:07Z ABSTRACT Glacier basal motion generates diurnal to multi-annual fluctuations in glacier velocity and mass flux. Understanding these fluctuations is important for prediction of future sea-level rise and for gaining insight into glacier physics and erosion. Here, we derive glacier velocity through cross-correlation of WorldView satellite imagery to document the evolution of ice surface velocity on Kennicott Glacier, Alaska, over the 2013 melt season. The summer speedup is spatially uniform over a ~12 km 2 area, over which the spring velocity varies significantly. Velocity increases by 1.4-fold to tenfold across the study domain, with larger values where spring velocities are low. To investigate the cross-glacier distribution of basal motion required to explain the observed surface speedup, we employ a two-dimensional cross-sectional glacier flow model. We find the model is insensitive to the spatial distribution of basal slip because stress gradient ice coupling diffuses the surface expression of the basal velocity field. While the temporal evolution of the subglacial hydrologic system is critical for predicting a glacier's response to meltwater inputs, our work suggests that glacier and ice-sheet models do not require a detailed representation of subglacial hydrology to accurately capture the spatial pattern of glacier speedup. Article in Journal/Newspaper glacier Ice Sheet Journal of Glaciology Alaska Cambridge University Press Journal of Glaciology 62 234 763 777 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes ARMSTRONG, W. H. ANDERSON, R. S. ALLEN, JEFFERY RAJARAM, H. Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT Glacier basal motion generates diurnal to multi-annual fluctuations in glacier velocity and mass flux. Understanding these fluctuations is important for prediction of future sea-level rise and for gaining insight into glacier physics and erosion. Here, we derive glacier velocity through cross-correlation of WorldView satellite imagery to document the evolution of ice surface velocity on Kennicott Glacier, Alaska, over the 2013 melt season. The summer speedup is spatially uniform over a ~12 km 2 area, over which the spring velocity varies significantly. Velocity increases by 1.4-fold to tenfold across the study domain, with larger values where spring velocities are low. To investigate the cross-glacier distribution of basal motion required to explain the observed surface speedup, we employ a two-dimensional cross-sectional glacier flow model. We find the model is insensitive to the spatial distribution of basal slip because stress gradient ice coupling diffuses the surface expression of the basal velocity field. While the temporal evolution of the subglacial hydrologic system is critical for predicting a glacier's response to meltwater inputs, our work suggests that glacier and ice-sheet models do not require a detailed representation of subglacial hydrology to accurately capture the spatial pattern of glacier speedup. |
format |
Article in Journal/Newspaper |
author |
ARMSTRONG, W. H. ANDERSON, R. S. ALLEN, JEFFERY RAJARAM, H. |
author_facet |
ARMSTRONG, W. H. ANDERSON, R. S. ALLEN, JEFFERY RAJARAM, H. |
author_sort |
ARMSTRONG, W. H. |
title |
Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
title_short |
Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
title_full |
Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
title_fullStr |
Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
title_full_unstemmed |
Modeling the WorldView-derived seasonal velocity evolution of Kennicott Glacier, Alaska |
title_sort |
modeling the worldview-derived seasonal velocity evolution of kennicott glacier, alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/jog.2016.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016000666 |
genre |
glacier Ice Sheet Journal of Glaciology Alaska |
genre_facet |
glacier Ice Sheet Journal of Glaciology Alaska |
op_source |
Journal of Glaciology volume 62, issue 234, page 763-777 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2016.66 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
234 |
container_start_page |
763 |
op_container_end_page |
777 |
_version_ |
1792500046033321984 |