Active layer and permafrost thermal regimes in the ice-free areas of Antarctica
Ice-free areas occupy <0.5% of Antarctica and are unevenly distributed across the continent. Terrestrial ecosystem dynamics in ice free areas are strongly influenced by permafrost and the associated active layer. These features are the least studied component of the cryosphere in Antarctica, with...
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2023
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Online Access: | https://hdl.handle.net/11383/2154972 https://doi.org/10.1016/j.earscirev.2023.104458 https://www.sciencedirect.com/science/article/pii/S0012825223001472 |
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ftuninsubriairis:oai:irinsubria.uninsubria.it:11383/2154972 2024-04-14T08:00:09+00:00 Active layer and permafrost thermal regimes in the ice-free areas of Antarctica Filip Hrbáček Marc Oliva Christel Hansen Megan Balks Tanya Ann O'Neill Miguel Angel de Pablo Stefano Ponti Miguel Ramos Goncalo Vieira Andrey Abramov Lucia Kaplan Pastirikova Mauro Guglielmin Gabriel Goaynes Marcio Rocha Francellino Carlos Schaefer Denis Lacelle Hrbáček, Filip Oliva, Marc Hansen, Christel Balks, Megan Ann O'Neill, Tanya Angel de Pablo, Miguel Ponti, Stefano Ramos, Miguel Vieira, Goncalo Abramov, Andrey Kaplan Pastirikova, Lucia Guglielmin, Mauro Goaynes, Gabriel Rocha Francellino, Marcio Schaefer, Carlo Lacelle, Denis 2023 ELETTRONICO https://hdl.handle.net/11383/2154972 https://doi.org/10.1016/j.earscirev.2023.104458 https://www.sciencedirect.com/science/article/pii/S0012825223001472 unknown info:eu-repo/semantics/altIdentifier/wos/WOS:001019046900001 volume:242 journal:EARTH-SCIENCE REVIEWS https://hdl.handle.net/11383/2154972 doi:10.1016/j.earscirev.2023.104458 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85161279449 https://www.sciencedirect.com/science/article/pii/S0012825223001472 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2023 ftuninsubriairis https://doi.org/10.1016/j.earscirev.2023.104458 2024-03-21T18:49:42Z Ice-free areas occupy <0.5% of Antarctica and are unevenly distributed across the continent. Terrestrial ecosystem dynamics in ice free areas are strongly influenced by permafrost and the associated active layer. These features are the least studied component of the cryosphere in Antarctica, with sparse data from permanent study sites mainly providing information related to the ground thermal regime and active layer thickness (ALT). One of the most important results of the International Polar Year (IPY, 2007/08) was an increase in ground thermal regime monitoring sites, and consequently our knowledge of Antarctic permafrost dynamics. Now, 15 years after the IPY, we provide the first comprehensive summary of the state of permafrost across Antarctica, including the sub-Antarctic Islands, with analyses of spatial and temporal patterns of the dominant external factors (climate, lithology, biota, and hydric regime) on the ground thermal regime and active layer thickness. The mean annual ground temperatures of the active layer and uppermost part of the permafrost in Antarctica remain just below 0 ◦C in the warmest parts of the Antarctic Peninsula, and were below − 20 ◦C in mountainous regions of the continent. The ALT varies between a few cm in the coldest, mountainous, parts of the Transantarctic Mountains up to >5 m in bedrock sites in the Antarctic Peninsula. The deepest and most variable ALTs (ca. 40 to >500 cm) were found in the Antarctic Peninsula, whereas the maximum ALT generally did not exceed 90 cm in Victoria Land and East Antarctica. Notably, found that the mean annual near-surface temperature follows the latitudinal gradient of − 0.9 ◦C/deg. (R2 = 0.9) and the active layer thickness 3.7 cm/deg. (R2 = 0.64). The continuous permafrost occurs in the vast majority of the ice-free areas in Antarctica. The modelling of temperature on the top of the permafrost indicates also the permafrost presence in South Orkneys and South Georgia. The only areas where deep boreholes and geophysical surveys indicates ... Article in Journal/Newspaper Active layer thickness Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice International Polar Year IPY permafrost Victoria Land IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) Antarctic The Antarctic Antarctic Peninsula East Antarctica Victoria Land Transantarctic Mountains Earth-Science Reviews 242 104458 |
institution |
Open Polar |
collection |
IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) |
op_collection_id |
ftuninsubriairis |
language |
unknown |
description |
Ice-free areas occupy <0.5% of Antarctica and are unevenly distributed across the continent. Terrestrial ecosystem dynamics in ice free areas are strongly influenced by permafrost and the associated active layer. These features are the least studied component of the cryosphere in Antarctica, with sparse data from permanent study sites mainly providing information related to the ground thermal regime and active layer thickness (ALT). One of the most important results of the International Polar Year (IPY, 2007/08) was an increase in ground thermal regime monitoring sites, and consequently our knowledge of Antarctic permafrost dynamics. Now, 15 years after the IPY, we provide the first comprehensive summary of the state of permafrost across Antarctica, including the sub-Antarctic Islands, with analyses of spatial and temporal patterns of the dominant external factors (climate, lithology, biota, and hydric regime) on the ground thermal regime and active layer thickness. The mean annual ground temperatures of the active layer and uppermost part of the permafrost in Antarctica remain just below 0 ◦C in the warmest parts of the Antarctic Peninsula, and were below − 20 ◦C in mountainous regions of the continent. The ALT varies between a few cm in the coldest, mountainous, parts of the Transantarctic Mountains up to >5 m in bedrock sites in the Antarctic Peninsula. The deepest and most variable ALTs (ca. 40 to >500 cm) were found in the Antarctic Peninsula, whereas the maximum ALT generally did not exceed 90 cm in Victoria Land and East Antarctica. Notably, found that the mean annual near-surface temperature follows the latitudinal gradient of − 0.9 ◦C/deg. (R2 = 0.9) and the active layer thickness 3.7 cm/deg. (R2 = 0.64). The continuous permafrost occurs in the vast majority of the ice-free areas in Antarctica. The modelling of temperature on the top of the permafrost indicates also the permafrost presence in South Orkneys and South Georgia. The only areas where deep boreholes and geophysical surveys indicates ... |
author2 |
Hrbáček, Filip Oliva, Marc Hansen, Christel Balks, Megan Ann O'Neill, Tanya Angel de Pablo, Miguel Ponti, Stefano Ramos, Miguel Vieira, Goncalo Abramov, Andrey Kaplan Pastirikova, Lucia Guglielmin, Mauro Goaynes, Gabriel Rocha Francellino, Marcio Schaefer, Carlo Lacelle, Denis |
format |
Article in Journal/Newspaper |
author |
Filip Hrbáček Marc Oliva Christel Hansen Megan Balks Tanya Ann O'Neill Miguel Angel de Pablo Stefano Ponti Miguel Ramos Goncalo Vieira Andrey Abramov Lucia Kaplan Pastirikova Mauro Guglielmin Gabriel Goaynes Marcio Rocha Francellino Carlos Schaefer Denis Lacelle |
spellingShingle |
Filip Hrbáček Marc Oliva Christel Hansen Megan Balks Tanya Ann O'Neill Miguel Angel de Pablo Stefano Ponti Miguel Ramos Goncalo Vieira Andrey Abramov Lucia Kaplan Pastirikova Mauro Guglielmin Gabriel Goaynes Marcio Rocha Francellino Carlos Schaefer Denis Lacelle Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
author_facet |
Filip Hrbáček Marc Oliva Christel Hansen Megan Balks Tanya Ann O'Neill Miguel Angel de Pablo Stefano Ponti Miguel Ramos Goncalo Vieira Andrey Abramov Lucia Kaplan Pastirikova Mauro Guglielmin Gabriel Goaynes Marcio Rocha Francellino Carlos Schaefer Denis Lacelle |
author_sort |
Filip Hrbáček |
title |
Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
title_short |
Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
title_full |
Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
title_fullStr |
Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
title_full_unstemmed |
Active layer and permafrost thermal regimes in the ice-free areas of Antarctica |
title_sort |
active layer and permafrost thermal regimes in the ice-free areas of antarctica |
publishDate |
2023 |
url |
https://hdl.handle.net/11383/2154972 https://doi.org/10.1016/j.earscirev.2023.104458 https://www.sciencedirect.com/science/article/pii/S0012825223001472 |
geographic |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Victoria Land Transantarctic Mountains |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Victoria Land Transantarctic Mountains |
genre |
Active layer thickness Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice International Polar Year IPY permafrost Victoria Land |
genre_facet |
Active layer thickness Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice International Polar Year IPY permafrost Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:001019046900001 volume:242 journal:EARTH-SCIENCE REVIEWS https://hdl.handle.net/11383/2154972 doi:10.1016/j.earscirev.2023.104458 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85161279449 https://www.sciencedirect.com/science/article/pii/S0012825223001472 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.earscirev.2023.104458 |
container_title |
Earth-Science Reviews |
container_volume |
242 |
container_start_page |
104458 |
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1796314610595266560 |