High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation
Small high-centered polygons, 3-15m in diameter, dominate moraine fields in an inland cold desert of the Sør Rondane Mountains, Antarctica. They mainly occur on moraine fields at two stages younger than 1Ma. The polygons on the younger moraine (<0.5Ma) generally have an ice wedge surrounded by ic...
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Graduate School of Life and Environmental Sciences, University of Tsukuba
2006
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ftnipr:oai:nipr.repo.nii.ac.jp:00003170 2023-05-15T13:49:00+02:00 High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation Norikazu Matsuoka Kazuomi Hirakawa 2006-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3170 http://id.nii.ac.jp/1291/00003170/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3170&item_no=1&attribute_id=18&file_no=1 en eng Graduate School of Life and Environmental Sciences, University of Tsukuba Faculty of Environmental Earth Science, Hokkaido University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3170 http://id.nii.ac.jp/1291/00003170/ AA1130866X Polar geoscience, 19, 189-201(2006-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3170&item_no=1&attribute_id=18&file_no=1 Antarctica permafrost patterned ground ice wedge sublimation Departmental Bulletin Paper P(論文) 2006 ftnipr 2022-12-03T19:43:04Z Small high-centered polygons, 3-15m in diameter, dominate moraine fields in an inland cold desert of the Sør Rondane Mountains, Antarctica. They mainly occur on moraine fields at two stages younger than 1Ma. The polygons on the younger moraine (<0.5Ma) generally have an ice wedge surrounded by ice-cemented permafrost, although the ice wedge cracking is inactive or too slow to be detectable. The polygons on the older moraine (0.5-1Ma) have either an ice wedge or ice-free wedge. The ice-free wedge underlies a subsided trough and consists entirely of loose and coarse sediments with vertically-oriented clasts, which represents an ice-wedge cast probably originating from long-term sublimation of an ice wedge. These observations suggest that flat-top polygons with ice wedges form in wet permafrost when located close to the ice sheet surface, but that the subsequent ice sheet lowering separates the polygons from the moisture source, and finally long-term ice sublimation leads to domed polygons with ice-wedge casts enclosed in dry permafrost. Report Antarc* Antarctica East Antarctica Ice Sheet permafrost Polar geoscience National Institute of Polar Research Repository, Japan East Antarctica Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Flat Top ENVELOPE(-137.387,-137.387,63.225,63.225) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Antarctica permafrost patterned ground ice wedge sublimation |
spellingShingle |
Antarctica permafrost patterned ground ice wedge sublimation Norikazu Matsuoka Kazuomi Hirakawa High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
topic_facet |
Antarctica permafrost patterned ground ice wedge sublimation |
description |
Small high-centered polygons, 3-15m in diameter, dominate moraine fields in an inland cold desert of the Sør Rondane Mountains, Antarctica. They mainly occur on moraine fields at two stages younger than 1Ma. The polygons on the younger moraine (<0.5Ma) generally have an ice wedge surrounded by ice-cemented permafrost, although the ice wedge cracking is inactive or too slow to be detectable. The polygons on the older moraine (0.5-1Ma) have either an ice wedge or ice-free wedge. The ice-free wedge underlies a subsided trough and consists entirely of loose and coarse sediments with vertically-oriented clasts, which represents an ice-wedge cast probably originating from long-term sublimation of an ice wedge. These observations suggest that flat-top polygons with ice wedges form in wet permafrost when located close to the ice sheet surface, but that the subsequent ice sheet lowering separates the polygons from the moisture source, and finally long-term ice sublimation leads to domed polygons with ice-wedge casts enclosed in dry permafrost. |
format |
Report |
author |
Norikazu Matsuoka Kazuomi Hirakawa |
author_facet |
Norikazu Matsuoka Kazuomi Hirakawa |
author_sort |
Norikazu Matsuoka |
title |
High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
title_short |
High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
title_full |
High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
title_fullStr |
High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
title_full_unstemmed |
High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation |
title_sort |
high-centered polygons in the sør rondane mountains, east antarctica: possible effect of ice wedge sublimation |
publisher |
Graduate School of Life and Environmental Sciences, University of Tsukuba |
publishDate |
2006 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3170 http://id.nii.ac.jp/1291/00003170/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3170&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(-137.387,-137.387,63.225,63.225) |
geographic |
East Antarctica Sør-Rondane Sør Rondane Mountains Flat Top |
geographic_facet |
East Antarctica Sør-Rondane Sør Rondane Mountains Flat Top |
genre |
Antarc* Antarctica East Antarctica Ice Sheet permafrost Polar geoscience |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet permafrost Polar geoscience |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3170 http://id.nii.ac.jp/1291/00003170/ AA1130866X Polar geoscience, 19, 189-201(2006-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3170&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250370318729216 |