2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation
ABSTRACT. We used measurements of radar-detected stratigraphy, surface ice-flow velocities and accumulation rates to investigate relationships between local valley-glacier and regional ice-sheet dynamics in and around the Schmidt Hills, Pensacola Mountains, Antarctica. Ground-penetrating radar profi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1077.506 2023-05-15T14:03:51+02:00 2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation Seth Campbell Greg Balco Claire Todd Howard Conway Kathleen Huybers Christopher Simmons Michael Vermeulen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.506 http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.506 http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf text ftciteseerx 2020-05-03T00:16:25Z ABSTRACT. We used measurements of radar-detected stratigraphy, surface ice-flow velocities and accumulation rates to investigate relationships between local valley-glacier and regional ice-sheet dynamics in and around the Schmidt Hills, Pensacola Mountains, Antarctica. Ground-penetrating radar profiles were collected perpendicular to the long axis of the Schmidt Hills and the margin of Foundation Ice Stream (FIS). Within the valley confines, the glacier consists of blue ice, and profiles show internal stratigraphy dipping steeply toward the nunataks and truncated at the present-day ablation surface. Below the valley confines, the blue ice is overlain by firn. Data show that upward-progressing overlap of actively accumulating firn onto valley-glacier ice is slightly less than ice flow out of the valleys over the past $1200 years. The apparent slightly negative mass balance (-0.25 cm a -1 ) suggests that ice-margin elevations in the Schmidt Hills may have lowered over this time period, even without a change in the surface elevation of FIS. Results suggest that (1) mass-balance gradients between local valley glaciers and regional ice sheets should be considered when using local information to estimate regional ice surface elevation changes; and (2) interpretation of shallow ice structures imaged with radar can provide information about local ice elevation changes and stability. Text Antarc* Antarctica Foundation Ice Stream Ice Sheet Unknown Foundation Ice Stream ENVELOPE(-60.000,-60.000,-83.250,-83.250) Pensacola Mountains ENVELOPE(-58.000,-58.000,-83.500,-83.500) Schmidt Hills ENVELOPE(-57.782,-57.782,-83.252,-83.252) |
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Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
ABSTRACT. We used measurements of radar-detected stratigraphy, surface ice-flow velocities and accumulation rates to investigate relationships between local valley-glacier and regional ice-sheet dynamics in and around the Schmidt Hills, Pensacola Mountains, Antarctica. Ground-penetrating radar profiles were collected perpendicular to the long axis of the Schmidt Hills and the margin of Foundation Ice Stream (FIS). Within the valley confines, the glacier consists of blue ice, and profiles show internal stratigraphy dipping steeply toward the nunataks and truncated at the present-day ablation surface. Below the valley confines, the blue ice is overlain by firn. Data show that upward-progressing overlap of actively accumulating firn onto valley-glacier ice is slightly less than ice flow out of the valleys over the past $1200 years. The apparent slightly negative mass balance (-0.25 cm a -1 ) suggests that ice-margin elevations in the Schmidt Hills may have lowered over this time period, even without a change in the surface elevation of FIS. Results suggest that (1) mass-balance gradients between local valley glaciers and regional ice sheets should be considered when using local information to estimate regional ice surface elevation changes; and (2) interpretation of shallow ice structures imaged with radar can provide information about local ice elevation changes and stability. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Seth Campbell Greg Balco Claire Todd Howard Conway Kathleen Huybers Christopher Simmons Michael Vermeulen |
spellingShingle |
Seth Campbell Greg Balco Claire Todd Howard Conway Kathleen Huybers Christopher Simmons Michael Vermeulen 2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
author_facet |
Seth Campbell Greg Balco Claire Todd Howard Conway Kathleen Huybers Christopher Simmons Michael Vermeulen |
author_sort |
Seth Campbell |
title |
2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
title_short |
2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
title_full |
2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
title_fullStr |
2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
title_full_unstemmed |
2013), Radar-detected englacial stratigraphy in the Pensacola Mountains, Antarctica: Implications for recent changes in ice flow and accumulation |
title_sort |
2013), radar-detected englacial stratigraphy in the pensacola mountains, antarctica: implications for recent changes in ice flow and accumulation |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.506 http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf |
long_lat |
ENVELOPE(-60.000,-60.000,-83.250,-83.250) ENVELOPE(-58.000,-58.000,-83.500,-83.500) ENVELOPE(-57.782,-57.782,-83.252,-83.252) |
geographic |
Foundation Ice Stream Pensacola Mountains Schmidt Hills |
geographic_facet |
Foundation Ice Stream Pensacola Mountains Schmidt Hills |
genre |
Antarc* Antarctica Foundation Ice Stream Ice Sheet |
genre_facet |
Antarc* Antarctica Foundation Ice Stream Ice Sheet |
op_source |
http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.506 http://noblegas.berkeley.edu/%7Ebalcs/pubs/Campbell_AnnGlac_2013.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766274709078409216 |