Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys
Ground-based surveys of ice-divide triple junctions in two Antarctic ice rises, the Fletcher Promontory and Berkner Island, have been carried out using low-frequency ice-penetrating radars. These surveys have focused on understanding the internal layer architecture at and around the triple junctions...
Published in: | Journal of Geophysical Research: Earth Surface |
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American Geophysical Union
2011
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Online Access: | http://nora.nerc.ac.uk/id/eprint/15021/ https://nora.nerc.ac.uk/id/eprint/15021/1/jgrf739.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JF001622 |
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ftnerc:oai:nora.nerc.ac.uk:15021 2023-05-15T13:45:11+02:00 Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys Hindmarsh, Richard C.A. King, Edward C. Mulvaney, Robert Corr, Hugh F.J. Hiess, Gisela Gillet-Chaulet, Fabien 2011-06-30 text http://nora.nerc.ac.uk/id/eprint/15021/ https://nora.nerc.ac.uk/id/eprint/15021/1/jgrf739.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JF001622 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/15021/1/jgrf739.pdf Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 King, Edward C. orcid:0000-0003-3793-3915 Mulvaney, Robert orcid:0000-0002-5372-8148 Corr, Hugh F.J.; Hiess, Gisela; Gillet-Chaulet, Fabien. 2011 Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys. Journal of Geophysical Research, 116 (F2), F02024. 14, pp. https://doi.org/10.1029/2009JF001622 <https://doi.org/10.1029/2009JF001622> Glaciology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1029/2009JF001622 2023-02-04T19:29:35Z Ground-based surveys of ice-divide triple junctions in two Antarctic ice rises, the Fletcher Promontory and Berkner Island, have been carried out using low-frequency ice-penetrating radars. These surveys have focused on understanding the internal layer architecture at and around the triple junctions, with a particular emphasis on understanding how the Raymond effect operates. A variety of features have been observed, including Raymond cupolas under the junctions, bump stacks of varying amplitude with distance from the divide, double bumps, crooked stacks implying divide motion, and the presence of ridges containing weak and strong bump stacks. It was generally not possible to elucidate the three-dimensional structure by correlation of pick crossovers, so instead a least squares cross-correlation technique was used which computes nominal age surfaces using radial basis function interpolation. Double bumps are absent from the central cupola of Fletcher Promontory, permitting us to infer that the ice here has thinned by around 500 m in the past 5000 years. Estimates of the age scale suggest that there will be recoverable Eemian ice. A technique for inferring the velocity profile at divides using layer traces and assumed velocities in the flanks is presented. Article in Journal/Newspaper Antarc* Antarctic Berkner Island Natural Environment Research Council: NERC Open Research Archive Antarctic Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Cupola ENVELOPE(-70.444,-70.444,-69.347,-69.347) Fletcher Promontory ENVELOPE(-80.000,-80.000,-78.416,-78.416) Journal of Geophysical Research: Earth Surface 116 F2 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Glaciology |
spellingShingle |
Glaciology Hindmarsh, Richard C.A. King, Edward C. Mulvaney, Robert Corr, Hugh F.J. Hiess, Gisela Gillet-Chaulet, Fabien Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
topic_facet |
Glaciology |
description |
Ground-based surveys of ice-divide triple junctions in two Antarctic ice rises, the Fletcher Promontory and Berkner Island, have been carried out using low-frequency ice-penetrating radars. These surveys have focused on understanding the internal layer architecture at and around the triple junctions, with a particular emphasis on understanding how the Raymond effect operates. A variety of features have been observed, including Raymond cupolas under the junctions, bump stacks of varying amplitude with distance from the divide, double bumps, crooked stacks implying divide motion, and the presence of ridges containing weak and strong bump stacks. It was generally not possible to elucidate the three-dimensional structure by correlation of pick crossovers, so instead a least squares cross-correlation technique was used which computes nominal age surfaces using radial basis function interpolation. Double bumps are absent from the central cupola of Fletcher Promontory, permitting us to infer that the ice here has thinned by around 500 m in the past 5000 years. Estimates of the age scale suggest that there will be recoverable Eemian ice. A technique for inferring the velocity profile at divides using layer traces and assumed velocities in the flanks is presented. |
format |
Article in Journal/Newspaper |
author |
Hindmarsh, Richard C.A. King, Edward C. Mulvaney, Robert Corr, Hugh F.J. Hiess, Gisela Gillet-Chaulet, Fabien |
author_facet |
Hindmarsh, Richard C.A. King, Edward C. Mulvaney, Robert Corr, Hugh F.J. Hiess, Gisela Gillet-Chaulet, Fabien |
author_sort |
Hindmarsh, Richard C.A. |
title |
Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
title_short |
Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
title_full |
Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
title_fullStr |
Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
title_full_unstemmed |
Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
title_sort |
flow at ice-divide triple junctions: 2. three-dimensional views of isochrone architecture from ice-penetrating radar surveys |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/15021/ https://nora.nerc.ac.uk/id/eprint/15021/1/jgrf739.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JF001622 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-70.444,-70.444,-69.347,-69.347) ENVELOPE(-80.000,-80.000,-78.416,-78.416) |
geographic |
Antarctic Berkner Island Cupola Fletcher Promontory |
geographic_facet |
Antarctic Berkner Island Cupola Fletcher Promontory |
genre |
Antarc* Antarctic Berkner Island |
genre_facet |
Antarc* Antarctic Berkner Island |
op_relation |
https://nora.nerc.ac.uk/id/eprint/15021/1/jgrf739.pdf Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 King, Edward C. orcid:0000-0003-3793-3915 Mulvaney, Robert orcid:0000-0002-5372-8148 Corr, Hugh F.J.; Hiess, Gisela; Gillet-Chaulet, Fabien. 2011 Flow at ice-divide triple junctions: 2. Three-dimensional views of isochrone architecture from ice-penetrating radar surveys. Journal of Geophysical Research, 116 (F2), F02024. 14, pp. https://doi.org/10.1029/2009JF001622 <https://doi.org/10.1029/2009JF001622> |
op_doi |
https://doi.org/10.1029/2009JF001622 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
116 |
container_issue |
F2 |
_version_ |
1766215787076386816 |