80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath
ABSTRACT. During three summer field seasons (2003, 2005 and 2006) we carried out radio-echo sound-ing measurements with a 5MHz (central frequency) ice-penetrating radar on McCall Glacier, Arctic Alaska, USA, along the central flowline and 17 cross-profiles. Two-way travel time was, after migration,...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.131 http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.669.131 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.669.131 2023-05-15T15:05:27+02:00 80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath Matt Nolan The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.131 http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.131 http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf text ftciteseerx 2016-01-08T17:14:21Z ABSTRACT. During three summer field seasons (2003, 2005 and 2006) we carried out radio-echo sound-ing measurements with a 5MHz (central frequency) ice-penetrating radar on McCall Glacier, Arctic Alaska, USA, along the central flowline and 17 cross-profiles. Two-way travel time was, after migration, converted to ice thickness, which, in combination with a recent digital elevation model of the surface of the glaciated area, resulted in a detailed map of the bed topography. This reveals a complex basal topography in the confluence area of the different glacial cirques. The pattern of subglacial water flow following the hydraulic potential gradient was calculated for the whole glacier area and shows a confluence of subglacial water downstream from the confluence of the glacier cirques. From the ice-thickness map the total ice volume was estimated as slightly less than 0.5 km3. Bed reflection power (BRP) was determined for the glacier after correction for ice-thickness dependence. Results reveal a clear relationship between the BRP pattern and basal sliding anomalies along the central flowline. Text Arctic glacier Alaska Unknown Arctic McCall ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
ABSTRACT. During three summer field seasons (2003, 2005 and 2006) we carried out radio-echo sound-ing measurements with a 5MHz (central frequency) ice-penetrating radar on McCall Glacier, Arctic Alaska, USA, along the central flowline and 17 cross-profiles. Two-way travel time was, after migration, converted to ice thickness, which, in combination with a recent digital elevation model of the surface of the glaciated area, resulted in a detailed map of the bed topography. This reveals a complex basal topography in the confluence area of the different glacial cirques. The pattern of subglacial water flow following the hydraulic potential gradient was calculated for the whole glacier area and shows a confluence of subglacial water downstream from the confluence of the glacier cirques. From the ice-thickness map the total ice volume was estimated as slightly less than 0.5 km3. Bed reflection power (BRP) was determined for the glacier after correction for ice-thickness dependence. Results reveal a clear relationship between the BRP pattern and basal sliding anomalies along the central flowline. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Matt Nolan |
spellingShingle |
Matt Nolan 80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
author_facet |
Matt Nolan |
author_sort |
Matt Nolan |
title |
80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
title_short |
80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
title_full |
80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
title_fullStr |
80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
title_full_unstemmed |
80 Annals of Glaciology 50(51) 2009 Bed properties and hydrological conditions underneath |
title_sort |
80 annals of glaciology 50(51) 2009 bed properties and hydrological conditions underneath |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.131 http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf |
long_lat |
ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
geographic |
Arctic McCall |
geographic_facet |
Arctic McCall |
genre |
Arctic glacier Alaska |
genre_facet |
Arctic glacier Alaska |
op_source |
http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.131 http://drmattnolan.org/mccall/Pattyn2009_Ann51%5B1%5D.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766337147758968832 |