Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica
Abstract 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 ve...
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crwiley:10.1002/ppp.701 2024-10-06T13:44:02+00:00 Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica Raffi, R. Stenni, B. 2010 http://dx.doi.org/10.1002/ppp.701 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.701 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.701 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 22, issue 1, page 65-83 ISSN 1045-6740 1099-1530 journal-article 2010 crwiley https://doi.org/10.1002/ppp.701 2024-09-11T04:17:32Z Abstract 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 (δ 18 O) 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 Permafrost and Periglacial Processes Victoria Land Wiley Online Library East Antarctica Victoria Land Permafrost and Periglacial Processes 22 1 65 83 |
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Wiley Online Library |
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English |
description |
Abstract 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 (δ 18 O) 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 |
Raffi, R. Stenni, B. |
spellingShingle |
Raffi, R. Stenni, B. Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica |
author_facet |
Raffi, R. Stenni, B. |
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 |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1002/ppp.701 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.701 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.701 |
geographic |
East Antarctica Victoria Land |
geographic_facet |
East Antarctica Victoria Land |
genre |
Antarc* Antarctica East Antarctica Permafrost and Periglacial Processes Victoria Land |
genre_facet |
Antarc* Antarctica East Antarctica Permafrost and Periglacial Processes Victoria Land |
op_source |
Permafrost and Periglacial Processes volume 22, issue 1, page 65-83 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.701 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
22 |
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1 |
container_start_page |
65 |
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83 |
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