Pan-Antarctic map of near-surface permafrost temperatures 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: | https://hdl.handle.net/10289/13744 https://doi.org/10.5194/tc-14-497-2020 |
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/13744 2023-07-02T03:30:06+02:00 Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan R. Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel 2020 application/pdf https://hdl.handle.net/10289/13744 https://doi.org/10.5194/tc-14-497-2020 en eng Copernicus GmbH The Cryosphere Obu, J., Westermann, S., Vieira, G., Abramov, A., Balks, M. R., Bartsch, A., … Ramos, M. (2020). Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale. The Cryosphere, 14(2), 497–519. https://doi.org/10.5194/tc-14-497-2020 https://hdl.handle.net/10289/13744 doi:10.5194/tc-14-497-2020 1994-0424 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Journal Article 2020 ftunivwaikato https://doi.org/10.5194/tc-14-497-2020 2023-06-13T17:23:27Z 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. Article in Journal/Newspaper Antarc* Antarctic Ice Ice Sheet permafrost The Cryosphere The University of Waikato: Research Commons 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 |
The University of Waikato: Research Commons |
op_collection_id |
ftunivwaikato |
language |
English |
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. |
format |
Article in Journal/Newspaper |
author |
Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan R. Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel |
spellingShingle |
Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan R. Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
author_facet |
Obu, Jaroslav Westermann, Sebastian Vieira, Gonçalo Abramov, Andrey Balks, Megan R. Bartsch, Annett Hrbáček, Filip Kääb, Andreas Ramos, Miguel |
author_sort |
Obu, Jaroslav |
title |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
title_short |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
title_full |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
title_fullStr |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
title_full_unstemmed |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale |
title_sort |
pan-antarctic map of near-surface permafrost temperatures at 1 km2 scale |
publisher |
Copernicus GmbH |
publishDate |
2020 |
url |
https://hdl.handle.net/10289/13744 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 The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Ice Sheet permafrost The Cryosphere |
op_relation |
The Cryosphere Obu, J., Westermann, S., Vieira, G., Abramov, A., Balks, M. R., Bartsch, A., … Ramos, M. (2020). Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale. The Cryosphere, 14(2), 497–519. https://doi.org/10.5194/tc-14-497-2020 https://hdl.handle.net/10289/13744 doi:10.5194/tc-14-497-2020 1994-0424 |
op_rights |
© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. |
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_ |
1770274346811523072 |