Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale
Permafrost is present within almost all of the Antarctic's ice-free areas, but little is known about spatial variations in permafrost temperatures except for a few areas with established ground temperature measurements. We modelled a temperature at the top of the permafrost (TTOP) for all the i...
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Online Access: | http://hdl.handle.net/10451/42665 https://doi.org/10.5194/tc-14-497-2020 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/42665 2023-05-15T13:59:03+02:00 Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan Ruby Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel 2020-04-01T15:24:11Z http://hdl.handle.net/10451/42665 https://doi.org/10.5194/tc-14-497-2020 eng eng Copernicus Publications https://www.the-cryosphere.net/14/497/2020/ Obu, J., Westermann, S., Vieira, G., Abramov, A., Ruby Balks, M., Bartsch, A., Ramos, M. (2020). Pan-antarctic map of near-surface permafrost temperatures at 1 km2 scale. Cryosphere, 14(2), 497-519. doi:10.5194/tc-14-497-2020. 1994-0416 http://hdl.handle.net/10451/42665 doi:10.5194/tc-14-497-2020 1994-0424 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Permafrost Antarctic’s ice-free areas Pan-Antarctic map article 2020 ftunivlisboa https://doi.org/10.5194/tc-14-497-2020 2023-02-08T01:07:17Z Permafrost is present within almost all of the Antarctic's ice-free areas, but little is known about spatial variations in permafrost temperatures except for a few areas with established ground temperature measurements. We modelled a temperature at the top of the permafrost (TTOP) for all the ice-free areas of the Antarctic mainland and Antarctic islands at 1 km2 resolution during 2000–2017. The model was driven by remotely sensed land surface temperatures and downscaled ERA-Interim climate reanalysis data, and subgrid permafrost variability was simulated by variable snow cover. The results were validated against in situ-measured ground temperatures from 40 permafrost boreholes, and the resulting root-mean-square error was 1.9 ∘C. The lowest near-surface permafrost temperature of −36 ∘C was modelled at Mount Markham in the Queen Elizabeth Range in the Transantarctic Mountains. This is the lowest permafrost temperature on Earth, according to global-scale modelling results. The temperatures were most commonly modelled between −23 and −18 ∘C for mountainous areas rising above the Antarctic Ice Sheet and between −14 and −8 ∘C for coastal areas. The model performance was good where snow conditions were modelled realistically, but errors of up to 4 ∘C occurred at sites with strong wind-driven redistribution of snow. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctic Ice Ice Sheet permafrost Universidade de Lisboa: repositório.UL Antarctic The Antarctic Transantarctic Mountains Markham ENVELOPE(-57.358,-57.358,-64.296,-64.296) Queen Elizabeth Range ENVELOPE(161.500,161.500,-83.333,-83.333) Mount Markham ENVELOPE(161.350,161.350,-82.850,-82.850) The Cryosphere 14 2 497 519 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Permafrost Antarctic’s ice-free areas Pan-Antarctic map |
spellingShingle |
Permafrost Antarctic’s ice-free areas Pan-Antarctic map Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan Ruby Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
topic_facet |
Permafrost Antarctic’s ice-free areas Pan-Antarctic map |
description |
Permafrost is present within almost all of the Antarctic's ice-free areas, but little is known about spatial variations in permafrost temperatures except for a few areas with established ground temperature measurements. We modelled a temperature at the top of the permafrost (TTOP) for all the ice-free areas of the Antarctic mainland and Antarctic islands at 1 km2 resolution during 2000–2017. The model was driven by remotely sensed land surface temperatures and downscaled ERA-Interim climate reanalysis data, and subgrid permafrost variability was simulated by variable snow cover. The results were validated against in situ-measured ground temperatures from 40 permafrost boreholes, and the resulting root-mean-square error was 1.9 ∘C. The lowest near-surface permafrost temperature of −36 ∘C was modelled at Mount Markham in the Queen Elizabeth Range in the Transantarctic Mountains. This is the lowest permafrost temperature on Earth, according to global-scale modelling results. The temperatures were most commonly modelled between −23 and −18 ∘C for mountainous areas rising above the Antarctic Ice Sheet and between −14 and −8 ∘C for coastal areas. The model performance was good where snow conditions were modelled realistically, but errors of up to 4 ∘C occurred at sites with strong wind-driven redistribution of snow. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan Ruby Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel |
author_facet |
Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan Ruby Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel |
author_sort |
Obu, Jaroslav |
title |
Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
title_short |
Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
title_full |
Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
title_fullStr |
Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
title_full_unstemmed |
Pan-Antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
title_sort |
pan-antarctic map of near-surface permafrost temperatures at at 1 km2 scale |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/42665 https://doi.org/10.5194/tc-14-497-2020 |
long_lat |
ENVELOPE(-57.358,-57.358,-64.296,-64.296) ENVELOPE(161.500,161.500,-83.333,-83.333) ENVELOPE(161.350,161.350,-82.850,-82.850) |
geographic |
Antarctic The Antarctic Transantarctic Mountains Markham Queen Elizabeth Range Mount Markham |
geographic_facet |
Antarctic The Antarctic Transantarctic Mountains Markham Queen Elizabeth Range Mount Markham |
genre |
Antarc* Antarctic Ice Ice Sheet permafrost |
genre_facet |
Antarc* Antarctic Ice Ice Sheet permafrost |
op_relation |
https://www.the-cryosphere.net/14/497/2020/ Obu, J., Westermann, S., Vieira, G., Abramov, A., Ruby Balks, M., Bartsch, A., Ramos, M. (2020). Pan-antarctic map of near-surface permafrost temperatures at 1 km2 scale. Cryosphere, 14(2), 497-519. doi:10.5194/tc-14-497-2020. 1994-0416 http://hdl.handle.net/10451/42665 doi:10.5194/tc-14-497-2020 1994-0424 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-497-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
2 |
container_start_page |
497 |
op_container_end_page |
519 |
_version_ |
1766267420674097152 |