Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range
We used ground-penetrating radar (GPR), GPS and glaciochemistry to evaluate melt regimes and ice depths, important variables for mass-balance and ice-volume studies, of Upper Yentna Glacier, Upper Kahiltna Glacier and the Mount Hunter ice divide, Alaska. We show the wet, percolation and dry snow zon...
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2011
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ftdartmouthcoll:oai:digitalcommons.dartmouth.edu:facoa-2761 2023-07-16T03:51:19+02:00 Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range Campbell, Seth Kreutz, Karl Osterberg, Erich Arcone, Steven 2011-09-17T07:00:00Z application/pdf https://digitalcommons.dartmouth.edu/facoa/1758 https://doi.org/10.3189/2012JoG10J238 https://digitalcommons.dartmouth.edu/context/facoa/article/2761/viewcontent/71363f610e0b83e671b45abc66296fe1251e.pdf unknown Dartmouth Digital Commons https://digitalcommons.dartmouth.edu/facoa/1758 doi:10.3189/2012JoG10J238 https://digitalcommons.dartmouth.edu/context/facoa/article/2761/viewcontent/71363f610e0b83e671b45abc66296fe1251e.pdf Dartmouth Scholarship space remote sensing radar observation subpolar zone satellite observation spaceborne radar valley glaciar temperate glacier ground-penetrating radar observation data geophysical surveys glaciers stratigraphy melting ice flow glacier dynamics arctic region alaska range north america polar regions united states alaska Earth Sciences Glaciology Physical Sciences and Mathematics text 2011 ftdartmouthcoll https://doi.org/10.3189/2012JoG10J238 2023-06-28T10:40:09Z We used ground-penetrating radar (GPR), GPS and glaciochemistry to evaluate melt regimes and ice depths, important variables for mass-balance and ice-volume studies, of Upper Yentna Glacier, Upper Kahiltna Glacier and the Mount Hunter ice divide, Alaska. We show the wet, percolation and dry snow zones located below 2700ma.s.l., at 2700 to 3900ma.s.l. and above 3900ma.s.l., respectively. We successfully imaged glacier ice depths upwards of 480m using 40–100MHz GPR frequencies. This depth is nearly double previous depth measurements reached using mid-frequency GPR systems on temperate glaciers. Few Holocene-length climate records are available in Alaska, hence we also assess stratigraphy and flow dynamics at each study site as a potential ice-core location. Ice layers in shallow firn cores and attenuated glaciochemical signals or lacking strata in GPR profiles collected on Upper Yentna Glacier suggest that regions below 2800ma.s.l. are inappropriate for paleoclimate studies because of chemical diffusion, through melt. Flow complexities on Kahiltna Glacier preclude ice-core climate studies. Minimal signs of melt or deformation, and depth–age model estimates suggesting 4815 years of ice on the Mount Hunter ice divide (3912ma.s.l.) make it a suitable Holocene-age ice-core location. Text alaska range Arctic glacier glaciers ice core Alaska Dartmouth Digital Commons (Dartmouth College) Arctic Mount Hunter ENVELOPE(-62.400,-62.400,-64.083,-64.083) Journal of Glaciology 58 207 99 109 |
institution |
Open Polar |
collection |
Dartmouth Digital Commons (Dartmouth College) |
op_collection_id |
ftdartmouthcoll |
language |
unknown |
topic |
space remote sensing radar observation subpolar zone satellite observation spaceborne radar valley glaciar temperate glacier ground-penetrating radar observation data geophysical surveys glaciers stratigraphy melting ice flow glacier dynamics arctic region alaska range north america polar regions united states alaska Earth Sciences Glaciology Physical Sciences and Mathematics |
spellingShingle |
space remote sensing radar observation subpolar zone satellite observation spaceborne radar valley glaciar temperate glacier ground-penetrating radar observation data geophysical surveys glaciers stratigraphy melting ice flow glacier dynamics arctic region alaska range north america polar regions united states alaska Earth Sciences Glaciology Physical Sciences and Mathematics Campbell, Seth Kreutz, Karl Osterberg, Erich Arcone, Steven Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
topic_facet |
space remote sensing radar observation subpolar zone satellite observation spaceborne radar valley glaciar temperate glacier ground-penetrating radar observation data geophysical surveys glaciers stratigraphy melting ice flow glacier dynamics arctic region alaska range north america polar regions united states alaska Earth Sciences Glaciology Physical Sciences and Mathematics |
description |
We used ground-penetrating radar (GPR), GPS and glaciochemistry to evaluate melt regimes and ice depths, important variables for mass-balance and ice-volume studies, of Upper Yentna Glacier, Upper Kahiltna Glacier and the Mount Hunter ice divide, Alaska. We show the wet, percolation and dry snow zones located below 2700ma.s.l., at 2700 to 3900ma.s.l. and above 3900ma.s.l., respectively. We successfully imaged glacier ice depths upwards of 480m using 40–100MHz GPR frequencies. This depth is nearly double previous depth measurements reached using mid-frequency GPR systems on temperate glaciers. Few Holocene-length climate records are available in Alaska, hence we also assess stratigraphy and flow dynamics at each study site as a potential ice-core location. Ice layers in shallow firn cores and attenuated glaciochemical signals or lacking strata in GPR profiles collected on Upper Yentna Glacier suggest that regions below 2800ma.s.l. are inappropriate for paleoclimate studies because of chemical diffusion, through melt. Flow complexities on Kahiltna Glacier preclude ice-core climate studies. Minimal signs of melt or deformation, and depth–age model estimates suggesting 4815 years of ice on the Mount Hunter ice divide (3912ma.s.l.) make it a suitable Holocene-age ice-core location. |
format |
Text |
author |
Campbell, Seth Kreutz, Karl Osterberg, Erich Arcone, Steven |
author_facet |
Campbell, Seth Kreutz, Karl Osterberg, Erich Arcone, Steven |
author_sort |
Campbell, Seth |
title |
Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
title_short |
Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
title_full |
Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
title_fullStr |
Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
title_full_unstemmed |
Melt Regimes, Stratigraphy, Flow Dynamics and Glaciochemistry of Three Glaciers in the Alaska Range |
title_sort |
melt regimes, stratigraphy, flow dynamics and glaciochemistry of three glaciers in the alaska range |
publisher |
Dartmouth Digital Commons |
publishDate |
2011 |
url |
https://digitalcommons.dartmouth.edu/facoa/1758 https://doi.org/10.3189/2012JoG10J238 https://digitalcommons.dartmouth.edu/context/facoa/article/2761/viewcontent/71363f610e0b83e671b45abc66296fe1251e.pdf |
long_lat |
ENVELOPE(-62.400,-62.400,-64.083,-64.083) |
geographic |
Arctic Mount Hunter |
geographic_facet |
Arctic Mount Hunter |
genre |
alaska range Arctic glacier glaciers ice core Alaska |
genre_facet |
alaska range Arctic glacier glaciers ice core Alaska |
op_source |
Dartmouth Scholarship |
op_relation |
https://digitalcommons.dartmouth.edu/facoa/1758 doi:10.3189/2012JoG10J238 https://digitalcommons.dartmouth.edu/context/facoa/article/2761/viewcontent/71363f610e0b83e671b45abc66296fe1251e.pdf |
op_doi |
https://doi.org/10.3189/2012JoG10J238 |
container_title |
Journal of Glaciology |
container_volume |
58 |
container_issue |
207 |
container_start_page |
99 |
op_container_end_page |
109 |
_version_ |
1771550737517510656 |