Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 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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ftdoajarticles:oai:doaj.org/article:cac86d94f32c45888670b926495dda43 2023-05-15T13:42:02+02:00 Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale J. Obu S. Westermann G. Vieira A. Abramov M. R. Balks A. Bartsch F. Hrbáček A. Kääb M. Ramos 2020-02-01T00:00:00Z https://doi.org/10.5194/tc-14-497-2020 https://doaj.org/article/cac86d94f32c45888670b926495dda43 EN eng Copernicus Publications https://www.the-cryosphere.net/14/497/2020/tc-14-497-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-497-2020 1994-0416 1994-0424 https://doaj.org/article/cac86d94f32c45888670b926495dda43 The Cryosphere, Vol 14, Pp 497-519 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-497-2020 2022-12-31T13:17:33Z 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 km 2 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 Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 J. Obu S. Westermann G. Vieira A. Abramov M. R. Balks A. Bartsch F. Hrbáček A. Kääb M. Ramos Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 km 2 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 |
J. Obu S. Westermann G. Vieira A. Abramov M. R. Balks A. Bartsch F. Hrbáček A. Kääb M. Ramos |
author_facet |
J. Obu S. Westermann G. Vieira A. Abramov M. R. Balks A. Bartsch F. Hrbáček A. Kääb M. Ramos |
author_sort |
J. Obu |
title |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
title_short |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
title_full |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
title_fullStr |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
title_full_unstemmed |
Pan-Antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
title_sort |
pan-antarctic map of near-surface permafrost temperatures at 1 km 2 scale |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-497-2020 https://doaj.org/article/cac86d94f32c45888670b926495dda43 |
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_source |
The Cryosphere, Vol 14, Pp 497-519 (2020) |
op_relation |
https://www.the-cryosphere.net/14/497/2020/tc-14-497-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-497-2020 1994-0416 1994-0424 https://doaj.org/article/cac86d94f32c45888670b926495dda43 |
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 |
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1766161922416181248 |