Melt regimes, internal stratigraphy, and flow dynamics 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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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1516 2023-05-15T13:09:44+02:00 Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Introne, Douglas Volkening, Kevin Winski, Dominic 2012-02-01T08:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/517 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1516&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/517 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1516&context=earthsci_facpub Earth Sciences Scholarship text 2012 ftuninhampshire 2023-01-30T21:35:20Z 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 2700 m a.s.l., at 2700 to 3900 m a.s.l. and above 3900 m a.s.l., respectively. We successfully imaged glacier ice depths upwards of 480 m using 40–100 MHz 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 2800 m a.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 (3912 m a.s.l.) make it a suitable Holocene-age ice-core location. Text alaska range glacier glaciers ice core Alaska University of New Hampshire: Scholars Repository Mount Hunter ENVELOPE(-62.400,-62.400,-64.083,-64.083) |
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University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
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 2700 m a.s.l., at 2700 to 3900 m a.s.l. and above 3900 m a.s.l., respectively. We successfully imaged glacier ice depths upwards of 480 m using 40–100 MHz 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 2800 m a.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 (3912 m a.s.l.) make it a suitable Holocene-age ice-core location. |
format |
Text |
author |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Introne, Douglas Volkening, Kevin Winski, Dominic |
spellingShingle |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Introne, Douglas Volkening, Kevin Winski, Dominic Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
author_facet |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Introne, Douglas Volkening, Kevin Winski, Dominic |
author_sort |
Campbell, Seth |
title |
Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
title_short |
Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
title_full |
Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
title_fullStr |
Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
title_full_unstemmed |
Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range |
title_sort |
melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the alaska range |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2012 |
url |
https://scholars.unh.edu/earthsci_facpub/517 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1516&context=earthsci_facpub |
long_lat |
ENVELOPE(-62.400,-62.400,-64.083,-64.083) |
geographic |
Mount Hunter |
geographic_facet |
Mount Hunter |
genre |
alaska range glacier glaciers ice core Alaska |
genre_facet |
alaska range glacier glaciers ice core Alaska |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/517 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1516&context=earthsci_facpub |
_version_ |
1766196437592309760 |