Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica
Ice wedges, with tops located 27 to 55 cm below the ground surface, were studied over several summers between 1998 and 2006 at three sites with differing elevations in northern Victoria Land, East Antarctica. The thermal regime, based on data‐logger measurements over five years, exhibits very low te...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.701 |
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ftrepec:oai:RePEc:wly:perpro:v:22:y:2011:i:1:p:65-83 2023-05-15T13:58:36+02:00 Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica R. Raffi B. Stenni https://doi.org/10.1002/ppp.701 unknown https://doi.org/10.1002/ppp.701 article ftrepec https://doi.org/10.1002/ppp.701 2020-12-04T13:31:25Z Ice wedges, with tops located 27 to 55 cm below the ground surface, were studied over several summers between 1998 and 2006 at three sites with differing elevations in northern Victoria Land, East Antarctica. The thermal regime, based on data‐logger measurements over five years, exhibits very low temperatures, an inferred absence of snow, and high temperature gradients between the ground surface and the top of the ice wedge that may trigger cracking. A co‐isotopic study of the wedge‐ice oxygen (δ18O) and hydrogen (δD) isotopic values shows extremely negative deuterium excess values and a strong divergence from the expected precipitation. These values and observations of hoarfrost crystals in ice‐wedge cracks during summer field surveys indicate that sublimation processes control the formation of ice in wedges, especially at high elevations within this region. Copyright © 2010 John Wiley & Sons, Ltd. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Victoria Land RePEc (Research Papers in Economics) East Antarctica Victoria Land Permafrost and Periglacial Processes 22 1 65 83 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
language |
unknown |
description |
Ice wedges, with tops located 27 to 55 cm below the ground surface, were studied over several summers between 1998 and 2006 at three sites with differing elevations in northern Victoria Land, East Antarctica. The thermal regime, based on data‐logger measurements over five years, exhibits very low temperatures, an inferred absence of snow, and high temperature gradients between the ground surface and the top of the ice wedge that may trigger cracking. A co‐isotopic study of the wedge‐ice oxygen (δ18O) and hydrogen (δD) isotopic values shows extremely negative deuterium excess values and a strong divergence from the expected precipitation. These values and observations of hoarfrost crystals in ice‐wedge cracks during summer field surveys indicate that sublimation processes control the formation of ice in wedges, especially at high elevations within this region. Copyright © 2010 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
R. Raffi B. Stenni |
spellingShingle |
R. Raffi B. Stenni Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
author_facet |
R. Raffi B. Stenni |
author_sort |
R. Raffi |
title |
Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
title_short |
Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
title_full |
Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
title_fullStr |
Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
title_full_unstemmed |
Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
title_sort |
isotopic composition and thermal regime of ice wedges in northern victoria land, east antarctica |
url |
https://doi.org/10.1002/ppp.701 |
geographic |
East Antarctica Victoria Land |
geographic_facet |
East Antarctica Victoria Land |
genre |
Antarc* Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica East Antarctica Victoria Land |
op_relation |
https://doi.org/10.1002/ppp.701 |
op_doi |
https://doi.org/10.1002/ppp.701 |
container_title |
Permafrost and Periglacial Processes |
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22 |
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1 |
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65 |
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83 |
_version_ |
1766266952654782464 |