Climate warming and permafrost dynamics in the Antarctic Peninsula region
Dramatic warming of the climate over the last several decades has influenced the properties and distribution of permafrost in the Antarctic Peninsula region. Five approaches were used to estimate the distribution of permafrost in the region: (1) correlation of permafrost distribution with mean annua...
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Online Access: | http://hdl.handle.net/10451/28360 https://doi.org/10.1016/j.gloplacha.2012.10.018 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/28360 2023-05-15T13:04:00+02:00 Climate warming and permafrost dynamics in the Antarctic Peninsula region Bockheim, J. Vieira, Goncalo Ramos, M. López-Martínez, J. Serrano, E. Guglielmin, M. Wilhelm, K. Nieuwendam, A. 2017-07-14T10:34:52Z http://hdl.handle.net/10451/28360 https://doi.org/10.1016/j.gloplacha.2012.10.018 eng eng Elsevier 0921-8181 http://hdl.handle.net/10451/28360 doi:10.1016/j.gloplacha.2012.10.018 closedAccess Permafrost Active-layer Ground surface temperature Boreholes Temperature gradient Periglacial features article 2017 ftunivlisboa https://doi.org/10.1016/j.gloplacha.2012.10.018 2022-05-25T18:37:02Z Dramatic warming of the climate over the last several decades has influenced the properties and distribution of permafrost in the Antarctic Peninsula region. Five approaches were used to estimate the distribution of permafrost in the region: (1) correlation of permafrost distribution with mean annual air temperature isotherms, (2) mapping the distribution of periglacial features indicative of permafrost, (3) summarizing data from shallow excavations and boreholes, (4) detection of permafrost from geophysical techniques, and (5) application of models to predict the occurrence of permafrost. Whereas permafrost is continuous in the South Orkney Islands (60–61°S) and along the eastern Antarctic Peninsula (63–65°S), it is discontinuous in the South Shetland Islands (62–63°S), and occurs only sporadically in the Palmer Archipelago and Biscoe Islands along the western Antarctic Peninsula (64–66°S). Permafrost then becomes continuous on Alexander Island (71–74°S) along the western Antarctic Peninsula as the maritime climate shifts to a more continental climate. Reports prior to 1980 mention the presence of permafrost at depths of 25 to 35 cm in ice-free areas near Palmer Station (64°46′ S; 64°04′W), where the mean annual air temperature from extrapolation of data from the nearby Vernadsky Station has increased 3.4 °C and the mean winter temperature has increased 6 °C since 1950. Recent measurements suggest that permafrost is absent or close to 0 °C in the upper 14 m of the highest ice-free areas (67 m a.s.l.) near Palmer Station. Permafrost temperatures elsewhere along the western Antarctic Peninsula region range from −0.4 to −1.8 °C in the South Shetland Islands (62–63°S) to −3.1 °C at Adelaide Island (67°34′ S). Permafrost at this temperature is susceptible to thawing, which has resulted in historic increases in active-layer thicknesses and in thermokarst features such as debris flows, and active-layer detachment slides. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Biscoe Islands Ice Palmer Archipelago permafrost South Orkney Islands South Shetland Islands Thermokarst Universidade de Lisboa: repositório.UL Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula Biscoe ENVELOPE(51.367,51.367,-66.217,-66.217) Biscoe Islands ENVELOPE(-65.000,-65.000,-66.000,-66.000) Palmer Archipelago ENVELOPE(-62.833,-62.833,-64.250,-64.250) Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) South Shetland Islands The Antarctic Vernadsky Station ENVELOPE(-64.257,-64.257,-65.245,-65.245) Global and Planetary Change 100 215 223 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Permafrost Active-layer Ground surface temperature Boreholes Temperature gradient Periglacial features |
spellingShingle |
Permafrost Active-layer Ground surface temperature Boreholes Temperature gradient Periglacial features Bockheim, J. Vieira, Goncalo Ramos, M. López-Martínez, J. Serrano, E. Guglielmin, M. Wilhelm, K. Nieuwendam, A. Climate warming and permafrost dynamics in the Antarctic Peninsula region |
topic_facet |
Permafrost Active-layer Ground surface temperature Boreholes Temperature gradient Periglacial features |
description |
Dramatic warming of the climate over the last several decades has influenced the properties and distribution of permafrost in the Antarctic Peninsula region. Five approaches were used to estimate the distribution of permafrost in the region: (1) correlation of permafrost distribution with mean annual air temperature isotherms, (2) mapping the distribution of periglacial features indicative of permafrost, (3) summarizing data from shallow excavations and boreholes, (4) detection of permafrost from geophysical techniques, and (5) application of models to predict the occurrence of permafrost. Whereas permafrost is continuous in the South Orkney Islands (60–61°S) and along the eastern Antarctic Peninsula (63–65°S), it is discontinuous in the South Shetland Islands (62–63°S), and occurs only sporadically in the Palmer Archipelago and Biscoe Islands along the western Antarctic Peninsula (64–66°S). Permafrost then becomes continuous on Alexander Island (71–74°S) along the western Antarctic Peninsula as the maritime climate shifts to a more continental climate. Reports prior to 1980 mention the presence of permafrost at depths of 25 to 35 cm in ice-free areas near Palmer Station (64°46′ S; 64°04′W), where the mean annual air temperature from extrapolation of data from the nearby Vernadsky Station has increased 3.4 °C and the mean winter temperature has increased 6 °C since 1950. Recent measurements suggest that permafrost is absent or close to 0 °C in the upper 14 m of the highest ice-free areas (67 m a.s.l.) near Palmer Station. Permafrost temperatures elsewhere along the western Antarctic Peninsula region range from −0.4 to −1.8 °C in the South Shetland Islands (62–63°S) to −3.1 °C at Adelaide Island (67°34′ S). Permafrost at this temperature is susceptible to thawing, which has resulted in historic increases in active-layer thicknesses and in thermokarst features such as debris flows, and active-layer detachment slides. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Bockheim, J. Vieira, Goncalo Ramos, M. López-Martínez, J. Serrano, E. Guglielmin, M. Wilhelm, K. Nieuwendam, A. |
author_facet |
Bockheim, J. Vieira, Goncalo Ramos, M. López-Martínez, J. Serrano, E. Guglielmin, M. Wilhelm, K. Nieuwendam, A. |
author_sort |
Bockheim, J. |
title |
Climate warming and permafrost dynamics in the Antarctic Peninsula region |
title_short |
Climate warming and permafrost dynamics in the Antarctic Peninsula region |
title_full |
Climate warming and permafrost dynamics in the Antarctic Peninsula region |
title_fullStr |
Climate warming and permafrost dynamics in the Antarctic Peninsula region |
title_full_unstemmed |
Climate warming and permafrost dynamics in the Antarctic Peninsula region |
title_sort |
climate warming and permafrost dynamics in the antarctic peninsula region |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://hdl.handle.net/10451/28360 https://doi.org/10.1016/j.gloplacha.2012.10.018 |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(51.367,51.367,-66.217,-66.217) ENVELOPE(-65.000,-65.000,-66.000,-66.000) ENVELOPE(-62.833,-62.833,-64.250,-64.250) ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-64.257,-64.257,-65.245,-65.245) |
geographic |
Adelaide Island Alexander Island Antarctic Antarctic Peninsula Biscoe Biscoe Islands Palmer Archipelago Palmer Station Palmer-Station South Orkney Islands South Shetland Islands The Antarctic Vernadsky Station |
geographic_facet |
Adelaide Island Alexander Island Antarctic Antarctic Peninsula Biscoe Biscoe Islands Palmer Archipelago Palmer Station Palmer-Station South Orkney Islands South Shetland Islands The Antarctic Vernadsky Station |
genre |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Biscoe Islands Ice Palmer Archipelago permafrost South Orkney Islands South Shetland Islands Thermokarst |
genre_facet |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Biscoe Islands Ice Palmer Archipelago permafrost South Orkney Islands South Shetland Islands Thermokarst |
op_relation |
0921-8181 http://hdl.handle.net/10451/28360 doi:10.1016/j.gloplacha.2012.10.018 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2012.10.018 |
container_title |
Global and Planetary Change |
container_volume |
100 |
container_start_page |
215 |
op_container_end_page |
223 |
_version_ |
1766350186062282752 |