Cristin-resultat-ID: 1795883
Sist endret: 3. desember 2020, 11:36
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale

Bidragsytere:
  • Jaroslav Obu
  • Sebastian Westermann
  • Gonçalo Vieira
  • Andrey Abramov
  • Megan Ruby Balks
  • Annett Bartsch
  • mfl.

Tidsskrift

The Cryosphere
ISSN 1994-0416
e-ISSN 1994-0424
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Volum: 14
Hefte: 2
Sider: 497 - 519
Open Access

Importkilder

Scopus-ID: 2-s2.0-85079389383

Beskrivelse Beskrivelse

Tittel

Pan-Antarctic map of near-surface permafrost temperatures at 1 km2 scale

Sammendrag

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.

Bidragsytere

Jaroslav Obu

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Sebastian Westermann

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Gonçalo Vieira

  • Tilknyttet:
    Forfatter
    ved Universidade de Lisboa

Andrey Abramov

  • Tilknyttet:
    Forfatter
    ved Russian Academy of Sciences

Megan Ruby Balks

  • Tilknyttet:
    Forfatter
    ved The University of Waikato
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