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 1998and 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 tem...
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ftunitriestiris:oai:arts.units.it:11368/2626908 2023-05-15T13:32:20+02:00 Isotopic composition and thermal regime of ice wedges in Northern Victoria Land, East Antarctica Raffi R. STENNI, BARBARA Raffi, R. Stenni, Barbara 2011 http://hdl.handle.net/11368/2626908 eng eng volume:22 firstpage:65 lastpage:83 numberofpages:19 journal:PERMAFROST AND PERIGLACIAL PROCESSES http://hdl.handle.net/11368/2626908 ice wedge frost cracking stable water isotopes hoarfrost sublimation Antarctica ground thermal regime info:eu-repo/semantics/article 2011 ftunitriestiris 2023-04-09T06:11:00Z Ice wedges, with tops located 27 to 55 cm below the ground surface, were studied over several summers between 1998and 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 (d18O) and hydrogen (dD) 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. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Victoria Land Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) East Antarctica Victoria Land |
institution |
Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
ice wedge frost cracking stable water isotopes hoarfrost sublimation Antarctica ground thermal regime |
spellingShingle |
ice wedge frost cracking stable water isotopes hoarfrost sublimation Antarctica ground thermal regime Raffi R. STENNI, BARBARA Isotopic composition and thermal regime of ice wedges in Northern Victoria Land, East Antarctica |
topic_facet |
ice wedge frost cracking stable water isotopes hoarfrost sublimation Antarctica ground thermal regime |
description |
Ice wedges, with tops located 27 to 55 cm below the ground surface, were studied over several summers between 1998and 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 (d18O) and hydrogen (dD) 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. |
author2 |
Raffi, R. Stenni, Barbara |
format |
Article in Journal/Newspaper |
author |
Raffi R. STENNI, BARBARA |
author_facet |
Raffi R. STENNI, BARBARA |
author_sort |
Raffi R. |
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 |
publishDate |
2011 |
url |
http://hdl.handle.net/11368/2626908 |
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 |
volume:22 firstpage:65 lastpage:83 numberofpages:19 journal:PERMAFROST AND PERIGLACIAL PROCESSES http://hdl.handle.net/11368/2626908 |
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1766025923471081472 |