Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry
We present radar interferograms of rock glaciers in the Beacon Valley sector of the McMurdo Dry Valleys, in East Antarctica, as part of a comprehensive study of surface processes in the area. Due to the relative absence of net precipitation (snow) in this region and the stability of the surface, the...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1002 2023-05-15T13:58:46+02:00 Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry Fountain, Andrew G. Rignot, Eric Hallet, Bernard 2002-06-01T07:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/3 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1002&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/3 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1002&context=geology_fac Geology Faculty Publications and Presentations Interferometry Glaciers -- Speed -- Measurement -- McMurdo Dry Valleys (Antarctica) Rock glaciers -- Measurement -- McMurdo Dry Valleys (Antarctica) Geology Hydrology text 2002 ftportlandstate 2022-01-09T19:24:25Z We present radar interferograms of rock glaciers in the Beacon Valley sector of the McMurdo Dry Valleys, in East Antarctica, as part of a comprehensive study of surface processes in the area. Due to the relative absence of net precipitation (snow) in this region and the stability of the surface, the rock glaciers maintain excellent coherence of the radar returns over several years. As a result, we obtain a spatially continuous surface velocity field with a precision of fractions of a millimeter per year. On distinct rock glaciers entering Beacon Valley, we find coherent velocity patterns, with peak velocities approaching 40 mm per year. The ice supply from these rock glaciers nourishes the central portion of Beacon Valley, where velocities are found to be vanishingly small, and partly compensates for mass losses induced by sublimation. This analysis is consistent with the tantalizing notion that Beacon Valley ice is the oldest on Earth. Text Antarc* Antarctica East Antarctica McMurdo Dry Valleys Portland State University: PDXScholar Beacon Valley ENVELOPE(160.650,160.650,-77.817,-77.817) East Antarctica McMurdo Dry Valleys |
institution |
Open Polar |
collection |
Portland State University: PDXScholar |
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ftportlandstate |
language |
unknown |
topic |
Interferometry Glaciers -- Speed -- Measurement -- McMurdo Dry Valleys (Antarctica) Rock glaciers -- Measurement -- McMurdo Dry Valleys (Antarctica) Geology Hydrology |
spellingShingle |
Interferometry Glaciers -- Speed -- Measurement -- McMurdo Dry Valleys (Antarctica) Rock glaciers -- Measurement -- McMurdo Dry Valleys (Antarctica) Geology Hydrology Fountain, Andrew G. Rignot, Eric Hallet, Bernard Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
topic_facet |
Interferometry Glaciers -- Speed -- Measurement -- McMurdo Dry Valleys (Antarctica) Rock glaciers -- Measurement -- McMurdo Dry Valleys (Antarctica) Geology Hydrology |
description |
We present radar interferograms of rock glaciers in the Beacon Valley sector of the McMurdo Dry Valleys, in East Antarctica, as part of a comprehensive study of surface processes in the area. Due to the relative absence of net precipitation (snow) in this region and the stability of the surface, the rock glaciers maintain excellent coherence of the radar returns over several years. As a result, we obtain a spatially continuous surface velocity field with a precision of fractions of a millimeter per year. On distinct rock glaciers entering Beacon Valley, we find coherent velocity patterns, with peak velocities approaching 40 mm per year. The ice supply from these rock glaciers nourishes the central portion of Beacon Valley, where velocities are found to be vanishingly small, and partly compensates for mass losses induced by sublimation. This analysis is consistent with the tantalizing notion that Beacon Valley ice is the oldest on Earth. |
format |
Text |
author |
Fountain, Andrew G. Rignot, Eric Hallet, Bernard |
author_facet |
Fountain, Andrew G. Rignot, Eric Hallet, Bernard |
author_sort |
Fountain, Andrew G. |
title |
Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
title_short |
Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
title_full |
Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
title_fullStr |
Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
title_full_unstemmed |
Rock Glacier Surface Motion in Beacon Valley, Antarctica, from Synthetic-Aperture Radar Interferometry |
title_sort |
rock glacier surface motion in beacon valley, antarctica, from synthetic-aperture radar interferometry |
publisher |
PDXScholar |
publishDate |
2002 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/3 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1002&context=geology_fac |
long_lat |
ENVELOPE(160.650,160.650,-77.817,-77.817) |
geographic |
Beacon Valley East Antarctica McMurdo Dry Valleys |
geographic_facet |
Beacon Valley East Antarctica McMurdo Dry Valleys |
genre |
Antarc* Antarctica East Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica East Antarctica McMurdo Dry Valleys |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/3 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1002&context=geology_fac |
_version_ |
1766267101224370176 |