Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land
AbstractDuring the 16th Italian Antarctic Expedition (2000/01) a geomorphological survey of permafrost-related polygons was carried out in the Mesa Range area, upper Rennick Glacier. The investigated site is located in the uppermost reaches of Pain Mesa, which forms the northern sector of the Mesa R...
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ftopenaccessrep:oai:zenodo.org:121949 2023-10-29T02:31:17+01:00 Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land Barbara Stenni Stefano Polesello Marina Camusso O. Flora Rossana Raffi 2004-01-01 https://www.openaccessrepository.it/record/121949 https://doi.org/10.3189/172756404781814195 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/121949 doi:10.3189/172756404781814195 info:eu-repo/semantics/openAccess NEANIAS Atmospheric Research Community Earth-Surface Processes info:eu-repo/semantics/article publication-article 2004 ftopenaccessrep https://doi.org/10.3189/172756404781814195 2023-10-03T22:18:56Z AbstractDuring the 16th Italian Antarctic Expedition (2000/01) a geomorphological survey of permafrost-related polygons was carried out in the Mesa Range area, upper Rennick Glacier. The investigated site is located in the uppermost reaches of Pain Mesa, which forms the northern sector of the Mesa Range. An ice wedge was found in a volcanic regolith at about 2200ma.s.l. This altitude is below a well-defined erosional trimline, located at about 2380ma.s.l. in this sector of Pain Mesa. The ice was sampled by inserting an ice screw, with an internal diameter of 14 mm, into the ice wedge in vertical sequences. Oriented block samples for thin sections were taken. A co-isotopic study was performed, measuring both oxygen (δ18O) and hydrogen (δD) isotope compositions. Tritium activity was measured, and major cations and anions were determined. The δ18O and δD obtained showed a strong divergence from the snowfalls expected to occur at this elevation, with extremely negative d excess values. Sublimation processes were taken into account to define the origin of the ice forming the wedge. The tritium data obtained suggest that the growth process of the ice wedge might still be active today. Article in Journal/Newspaper Antarc* Antarctic Ice permafrost Rennick Glacier Victoria Land wedge* Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Annals of Glaciology 39 379 385 |
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Open Polar |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
NEANIAS Atmospheric Research Community Earth-Surface Processes |
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NEANIAS Atmospheric Research Community Earth-Surface Processes Barbara Stenni Stefano Polesello Marina Camusso O. Flora Rossana Raffi Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
topic_facet |
NEANIAS Atmospheric Research Community Earth-Surface Processes |
description |
AbstractDuring the 16th Italian Antarctic Expedition (2000/01) a geomorphological survey of permafrost-related polygons was carried out in the Mesa Range area, upper Rennick Glacier. The investigated site is located in the uppermost reaches of Pain Mesa, which forms the northern sector of the Mesa Range. An ice wedge was found in a volcanic regolith at about 2200ma.s.l. This altitude is below a well-defined erosional trimline, located at about 2380ma.s.l. in this sector of Pain Mesa. The ice was sampled by inserting an ice screw, with an internal diameter of 14 mm, into the ice wedge in vertical sequences. Oriented block samples for thin sections were taken. A co-isotopic study was performed, measuring both oxygen (δ18O) and hydrogen (δD) isotope compositions. Tritium activity was measured, and major cations and anions were determined. The δ18O and δD obtained showed a strong divergence from the snowfalls expected to occur at this elevation, with extremely negative d excess values. Sublimation processes were taken into account to define the origin of the ice forming the wedge. The tritium data obtained suggest that the growth process of the ice wedge might still be active today. |
format |
Article in Journal/Newspaper |
author |
Barbara Stenni Stefano Polesello Marina Camusso O. Flora Rossana Raffi |
author_facet |
Barbara Stenni Stefano Polesello Marina Camusso O. Flora Rossana Raffi |
author_sort |
Barbara Stenni |
title |
Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
title_short |
Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
title_full |
Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
title_fullStr |
Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
title_full_unstemmed |
Growth processes of an inland Antarctic ice wedge, Mesa Range, northern Victoria Land |
title_sort |
growth processes of an inland antarctic ice wedge, mesa range, northern victoria land |
publishDate |
2004 |
url |
https://www.openaccessrepository.it/record/121949 https://doi.org/10.3189/172756404781814195 |
genre |
Antarc* Antarctic Ice permafrost Rennick Glacier Victoria Land wedge* |
genre_facet |
Antarc* Antarctic Ice permafrost Rennick Glacier Victoria Land wedge* |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/121949 doi:10.3189/172756404781814195 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/172756404781814195 |
container_title |
Annals of Glaciology |
container_volume |
39 |
container_start_page |
379 |
op_container_end_page |
385 |
_version_ |
1781068636929130496 |